{"id":76338,"date":"2026-02-22T09:05:49","date_gmt":"2026-02-22T01:05:49","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76338.html"},"modified":"2026-02-22T09:05:49","modified_gmt":"2026-02-22T01:05:49","slug":"java-%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e5%a5%97%e6%8e%a5%e5%ad%97%e5%85%a5%e9%97%a8%ef%bc%9a%e4%bb%8e%e5%8f%91%e4%b8%80%e6%ae%b5%e6%95%b0%e6%8d%ae%e5%88%b0%e5%86%99","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76338.html","title":{"rendered":"Java \u7f51\u7edc\u7f16\u7a0b\u5957\u63a5\u5b57\u5165\u95e8\uff1a\u4ece\u201c\u53d1\u4e00\u6bb5\u6570\u636e\u201d\u5230\u201c\u5199\u4e00\u4e2a\u53ef\u5e76\u53d1\u7684\u670d\u52a1\u5668\u201d"},"content":{"rendered":"<h2>Java \u7f51\u7edc\u7f16\u7a0b\u5957\u63a5\u5b57\u5165\u95e8&#xff1a;\u4ece\u201c\u53d1\u4e00\u6bb5\u6570\u636e\u201d\u5230\u201c\u5199\u4e00\u4e2a\u53ef\u5e76\u53d1\u7684\u670d\u52a1\u5668\u201d<\/h2>\n<p>\u7f51\u7edc\u7f16\u7a0b\u6700\u6838\u5fc3\u7684\u76ee\u6807&#xff1a;\u8ba9\u4e0d\u540c\u4e3b\u673a&#xff08;\u6216\u540c\u4e00\u4e3b\u673a\u7684\u4e0d\u540c\u8fdb\u7a0b&#xff09;\u901a\u8fc7\u7f51\u7edc\u4f20\u8f93\u6570\u636e\u3002\u4f60\u5728\u6d4f\u89c8\u5668\u770b\u89c6\u9891\u3001\u5237\u56fe\u7247\u3001\u8bfb\u6587\u7ae0&#xff0c;\u672c\u8d28\u90fd\u662f\u201c\u5ba2\u6237\u7aef\u8fdb\u7a0b\u201d\u5411\u201c\u670d\u52a1\u7aef\u8fdb\u7a0b\u201d\u8bf7\u6c42\u7f51\u7edc\u8d44\u6e90&#xff0c;\u7136\u540e\u63a5\u6536\u54cd\u5e94\u6570\u636e\u3002<\/p>\n<p>\u5148\u660e\u786e\u8bf7\u6c42\/\u54cd\u5e94\u3001\u5ba2\u6237\u7aef\/\u670d\u52a1\u7aef&#xff0c;\u518d\u843d\u5230 UDP\/TCP \u4e24\u6761\u8def\u7ebf&#xff0c;\u6700\u540e\u8bb2\u5230\u7aef\u53e3\u5360\u7528\u3001\u5e76\u53d1\u5904\u7406\u3001\u957f\u77ed\u8fde\u63a5\u8fd9\u4e9b\u5de5\u7a0b\u7ea7\u5751\u70b9\u3002\u4e0b\u9762\u6309\u4e00\u6761\u987a\u6ed1\u7684\u5b66\u4e60\u8def\u5f84\u4e32\u8d77\u6765\u3002<\/p>\n<hr \/>\n<h3>1&#xff09;\u7f51\u7edc\u7f16\u7a0b\u5230\u5e95\u5728\u7f16\u4ec0\u4e48&#xff1a;\u8fdb\u7a0b\u4e4b\u95f4\u7684\u6570\u636e\u4f20\u8f93<\/h3>\n<p>\u6765\u770b\u4e00\u4e2a\u5173\u952e\u5b9a\u4e49&#xff1a;\u7f51\u7edc\u7f16\u7a0b\u5c31\u662f\u7f51\u7edc\u4e0a\u7684\u4e3b\u673a&#xff0c;\u901a\u8fc7\u4e0d\u540c\u8fdb\u7a0b&#xff0c;\u4ee5\u7f16\u7a0b\u65b9\u5f0f\u5b9e\u73b0\u7f51\u7edc\u901a\u4fe1&#xff08;\u7f51\u7edc\u6570\u636e\u4f20\u8f93&#xff09;\u3002\u53ea\u8981\u662f\u4e0d\u540c\u8fdb\u7a0b&#xff0c;\u54ea\u6015\u5728\u540c\u4e00\u53f0\u673a\u5668\u4e0a&#xff0c;\u901a\u8fc7\u7f51\u7edc\u534f\u8bae\u6808\u6536\u53d1\u6570\u636e&#xff0c;\u4e5f\u7b97\u7f51\u7edc\u7f16\u7a0b\u3002<\/p>\n<p>\u4e8e\u662f\u4f1a\u51fa\u73b0\u4e09\u4e2a\u9ad8\u9891\u201c\u89d2\u8272\u540d\u8bcd\u201d&#xff1a;<\/p>\n<ul>\n<li>\u53d1\u9001\u7aef \/ \u63a5\u6536\u7aef&#xff1a;\u4e00\u6b21\u6570\u636e\u6d41\u5411\u91cc&#xff0c;\u53d1\u9001\u6570\u636e\u7684\u4e00\u65b9\u53eb\u53d1\u9001\u7aef&#xff0c;\u63a5\u6536\u6570\u636e\u7684\u4e00\u65b9\u53eb\u63a5\u6536\u7aef&#xff08;\u8fd9\u4fe9\u662f\u76f8\u5bf9\u6982\u5ff5&#xff09;\u3002<\/li>\n<li>\u8bf7\u6c42 \/ \u54cd\u5e94&#xff1a;\u83b7\u53d6\u7f51\u7edc\u8d44\u6e90\u901a\u5e38\u8981\u4e24\u6b21\u4f20\u8f93&#xff1a;\u5148\u53d1\u8bf7\u6c42&#xff0c;\u518d\u56de\u54cd\u5e94\u3002<\/li>\n<li>\u5ba2\u6237\u7aef \/ \u670d\u52a1\u7aef&#xff1a;\u63d0\u4f9b\u670d\u52a1\u8d44\u6e90\u7684\u4e00\u65b9\u662f\u670d\u52a1\u7aef&#xff0c;\u83b7\u53d6\u670d\u52a1\u7684\u4e00\u65b9\u662f\u5ba2\u6237\u7aef\u3002\u5e38\u89c1\u6d41\u7a0b\u662f&#xff1a;\u5ba2\u6237\u7aef\u8bf7\u6c42 \u2192 \u670d\u52a1\u7aef\u5904\u7406\u4e1a\u52a1 \u2192 \u670d\u52a1\u7aef\u54cd\u5e94 \u2192 \u5ba2\u6237\u7aef\u5c55\u793a\u7ed3\u679c\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222010547-699a566b3795e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<\/ul>\n<hr \/>\n<h3>2&#xff09;Socket \u5957\u63a5\u5b57&#xff1a;\u7f51\u7edc\u901a\u4fe1\u7684\u201c\u57fa\u672c\u64cd\u4f5c\u5355\u5143\u201d<\/h3>\n<p>\u6765\u770b Socket \u7684\u5b9a\u4f4d&#xff1a;\u5b83\u662f\u7cfb\u7edf\u63d0\u4f9b\u7684\u4e00\u79cd\u7f51\u7edc\u901a\u4fe1\u6280\u672f&#xff0c;\u662f\u57fa\u4e8e TCP\/IP \u7684\u7f51\u7edc\u901a\u4fe1\u57fa\u672c\u64cd\u4f5c\u5355\u5143\u3002\u57fa\u4e8e Socket \u5199\u51fa\u6765\u7684\u7a0b\u5e8f&#xff0c;\u5c31\u662f\u7f51\u7edc\u7f16\u7a0b\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222010547-699a566b8a8a2.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6309\u4f20\u8f93\u5c42\u534f\u8bae&#xff0c;Socket \u4e3b\u8981\u5206\u4e09\u7c7b&#xff1a;<\/p>\n<li>\n<p>\u6d41\u5957\u63a5\u5b57&#xff08;TCP&#xff09;<\/p>\n<ul>\n<li>\u6709\u8fde\u63a5\u3001\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u5b57\u8282\u6d41<\/li>\n<li>\u6709\u53d1\u9001\u7f13\u51b2\u533a\u4e5f\u6709\u63a5\u6536\u7f13\u51b2\u533a<\/li>\n<li>\u6570\u636e\u201c\u6ca1\u6709\u8fb9\u754c\u201d&#xff1a;\u53ef\u4ee5\u591a\u6b21\u53d1\u9001\u3001\u5206\u591a\u6b21\u63a5\u6536&#xff08;\u53ea\u8981\u8fde\u63a5\u4e0d\u65ad&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6570\u636e\u62a5\u5957\u63a5\u5b57&#xff08;UDP&#xff09;<\/p>\n<ul>\n<li>\u65e0\u8fde\u63a5\u3001\u4e0d\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u6570\u636e\u62a5<\/li>\n<li>\u6709\u63a5\u6536\u7f13\u51b2\u533a\u3001\u901a\u5e38\u4e0d\u5f3a\u8c03\u53d1\u9001\u7f13\u51b2\u533a<\/li>\n<li>\u6570\u636e\u201c\u6709\u8fb9\u754c\u201d&#xff1a;\u53d1 100 \u5b57\u8282\u5c31\u8981\u4e00\u6b21\u53d1\u5b8c\u3001\u4e00\u6b21\u6536\u5b8c<\/li>\n<li>\u5355\u4e2a\u6570\u636e\u62a5\u5927\u5c0f\u53d7\u9650&#xff08;\u5e38\u89c1\u4e0a\u9650 64KB&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u539f\u59cb\u5957\u63a5\u5b57&#xff08;\u7528\u4e8e\u81ea\u5b9a\u4e49\u4f20\u8f93\u5c42\u534f\u8bae\/\u8bfb\u5199\u5185\u6838\u672a\u5904\u7406\u7684 IP \u6570\u636e&#xff0c;\u4e86\u89e3\u5373\u53ef&#xff09;<\/p>\n<\/li>\n<hr \/>\n<h3>3&#xff09;UDP \u7f16\u7a0b\u6a21\u578b&#xff1a;\u4e00\u6b21\u4e00\u5305&#xff0c;\u6536\u53d1\u90fd\u9760 DatagramPacket<\/h3>\n<p>\u6765\u770b UDP \u7684\u201c\u813e\u6c14\u201d&#xff1a;\u5b83\u4e0d\u5efa\u7acb\u8fde\u63a5&#xff0c;\u53d1\u9001\u4e00\u5757\u6570\u636e\u5c31\u5fc5\u987b\u6574\u4f53\u53d1\u9001&#xff0c;\u63a5\u6536\u4e5f\u5fc5\u987b\u6574\u4f53\u63a5\u6536\u3002Java \u91cc\u4e3b\u8981\u9760\u4e24\u4e2a\u7c7b&#xff1a;<\/p>\n<ul>\n<li>DatagramSocket&#xff1a;UDP Socket&#xff0c;\u7528\u6765 send\/receive \u6570\u636e\u62a5<\/li>\n<li>DatagramPacket&#xff1a;\u6570\u636e\u62a5\u672c\u4f53&#xff08;\u643a\u5e26\u5b57\u8282\u6570\u7ec4 &#043; \u76ee\u6807\/\u6765\u6e90\u5730\u5740\u4fe1\u606f&#xff09;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222010547-699a566bba2a5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222010548-699a566c0bc39.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<\/ul>\n<h4>3.1 DatagramSocket \u5173\u952e\u7528\u6cd5<\/h4>\n<ul>\n<li>new DatagramSocket()&#xff1a;\u7ed1\u5b9a\u672c\u673a\u968f\u673a\u7aef\u53e3&#xff08;\u66f4\u5e38\u89c1\u4e8e\u5ba2\u6237\u7aef&#xff09;<\/li>\n<li>new DatagramSocket(port)&#xff1a;\u7ed1\u5b9a\u672c\u673a\u6307\u5b9a\u7aef\u53e3&#xff08;\u66f4\u5e38\u89c1\u4e8e\u670d\u52a1\u7aef&#xff09;<\/li>\n<li>receive(packet)&#xff1a;\u963b\u585e\u7b49\u5f85\u63a5\u6536<\/li>\n<li>send(packet)&#xff1a;\u53d1\u9001&#xff08;\u901a\u5e38\u4e0d\u963b\u585e\u7b49\u5f85&#xff09;<\/li>\n<li>close()&#xff1a;\u5173\u95ed\u5957\u63a5\u5b57<\/li>\n<\/ul>\n<h4>3.2 DatagramPacket \u5173\u952e\u7528\u6cd5<\/h4>\n<ul>\n<li>\u63a5\u6536\u5305&#xff1a;new DatagramPacket(byte[] buf, int length)<\/li>\n<li>\u53d1\u9001\u5305&#xff1a;new DatagramPacket(byte[] buf, int offset, int length, SocketAddress address) \u6216\u6307\u5b9a InetAddress &#043; port<\/li>\n<li>getAddress()\/getPort()\/getData()&#xff1a;\u83b7\u53d6\u5bf9\u7aef\u5730\u5740\u3001\u7aef\u53e3\u548c\u6570\u636e<\/li>\n<\/ul>\n<hr \/>\n<h3>4&#xff09;\u6765\u770b UDP \u56de\u663e&#xff1a;\u6700\u77ed\u8def\u5f84\u7406\u89e3\u201c\u8bf7\u6c42\u2192\u5904\u7406\u2192\u54cd\u5e94\u201d<\/h3>\n<p>\u56de\u663e&#xff08;Echo&#xff09;\u662f\u7f51\u7edc\u7f16\u7a0b\u91cc\u7684\u201cHello World\u201d&#xff1a;\u5ba2\u6237\u7aef\u53d1\u4ec0\u4e48&#xff0c;\u670d\u52a1\u7aef\u56de\u4ec0\u4e48\u3002\u4e0b\u9762\u8fd9\u4e24\u6bb5\u5c31\u662f\u5b8c\u6574\u53ef\u8fd0\u884c\u7248\u672c&#xff08;\u5e26\u6ce8\u91ca&#xff09;\u3002\u4ee3\u7801\u6765\u81ea\u538b\u7f29\u5305\u3002<\/p>\n<h4>4.1 UDP Echo Server&#xff08;\u670d\u52a1\u7aef&#xff09;<\/h4>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">network<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">SocketException<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpEchoServer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">DatagramSocket<\/span> socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UdpEchoServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">SocketException<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6307\u5b9a\u4e86\u4e00\u4e2a\u56fa\u5b9a\u7aef\u53e3\u53f7\u8ba9\u670d\u52a1\u5668\u6765\u4f7f\u7528<\/span><br \/>\n        socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/socket\u5bf9\u8c61\u4ee3\u8868\u7f51\u5361\u6587\u4ef6&#xff0c;\u8bfb\u8fd9\u4e2a\u6587\u4ef6\u7b49\u4e8e\u4ece\u7f51\u5361\u6536\u6570\u636e&#xff0c;\u5199\u8fd9\u4e2a\u6587\u4ef6\u7b49\u4e8e\u8ba9\u7f51\u5361\u53d1\u6570\u636e<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u542f\u52a8\u670d\u52a1\u5668<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u542f\u52a8&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5faa\u73af\u4e00\u6b21&#xff0c;\u76f8\u5f53\u4e8e\u5904\u7406\u4e00\u6b21\u8bf7\u6c42<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5904\u7406\u8bf7\u6c42\u7684\u8fc7\u7a0b&#xff0c;\u5178\u578b\u7684\u670d\u52a1\u5668\u90fd\u5206\u4e3a\u4e09\u4e2a\u6b65\u9aa4<\/span><br \/>\n            <span class=\"token comment\">\/\/1\u3001\u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790<\/span><br \/>\n            <span class=\"token comment\">\/\/ DatagramPacket\u8868\u793a\u4e00\u4e2aUDP\u6570\u636e\u62a5&#xff0c;\u6b64\u5904\u4f20\u5165\u7684\u5b57\u8282\u6570\u7ec4\u5c31\u4fdd\u5b58UDP\u7684\u8f7d\u8377\u90e8\u5206<\/span><br \/>\n            <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/receive\u4f1a\u89e6\u53d1\u963b\u585e&#xff0c;\u76f4\u5230\u6536\u5230\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u628a\u8bfb\u53d6\u5230\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u8f6c\u6362\u6210\u5b57\u7b26\u4e32<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/2\u3001\u6839\u636e\u8bf7\u6c42&#xff0c;\u8ba1\u7b97\u54cd\u5e94&#xff08;\u670d\u52a1\u5668\u6700\u5173\u952e\u7684\u903b\u8f91&#xff09;<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/3\u3001\u628a\u54cd\u5e94\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6839\u636eresponse\u6784\u9020DatagramPacket&#xff0c;\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6b64\u5904\u4e0d\u80fd\u4f7f\u7528response.length() \u8fd9\u662fstring\u4e2d\u5b57\u7b26\u7684\u4e2a\u6570 \u800c\u4e0b\u9762\u7684\u662fString\u4e2d\u5b57\u8282\u7684\u4e2a\u6570<\/span><br \/>\n            <span class=\"token class-name\">DatagramPacket<\/span> responsePacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>response<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSocketAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6b64\u5904\u8fd8\u4e0d\u80fd\u76f4\u63a5\u53d1\u9001&#xff0c;UDP\u534f\u8bae\u81ea\u8eab\u6ca1\u6709\u4fdd\u5b58\u5bf9\u65b9\u7684\u4fe1\u606f<\/span><br \/>\n            <span class=\"token comment\">\/\/\u9700\u8981\u6307\u5b9a\u76ee\u7684ip\u548c\u7aef\u53e3\u53f7<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>responsePacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/4.\u6253\u5370\u4e00\u4e2a\u65e5\u5fd7<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s:%d] req: %s, resp: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>requestPacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>responsePacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>request<span class=\"token punctuation\">,<\/span>response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">SocketException<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">UdpEchoServer<\/span> server <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UdpEchoServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9090<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        server<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.2 UDP Echo Client&#xff08;\u5ba2\u6237\u7aef&#xff09;<\/h4>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">network<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UdpEchoClient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">DatagramSocket<\/span> socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/UDP\u672c\u8eab\u4e0d\u4fdd\u5b58\u5bf9\u7aef\u7684\u4fe1\u606f&#xff0c;\u7ed9\u81ea\u5df1\u7684\u4ee3\u7801\u4e2d\u4fdd\u5b58\u4e00\u4e0b<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> serverIp<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> serverPort<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UdpEchoClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> serverIp<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> serverPort<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">SocketException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>serverIp <span class=\"token operator\">&#061;<\/span> serverIp<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>serverPort <span class=\"token operator\">&#061;<\/span> serverPort<span class=\"token punctuation\">;<\/span><br \/>\n        socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramSocket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u4e00\u5b9a\u4e0d\u80fd\u586b\u5199serverPort,serverip\u662f\u76ee\u7684ip,serverport\u662f\u76ee\u7684\u7aef\u53e3<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6e90ip\u6240\u5728\u7684\u5ba2\u6237\u7aef\u7684\u4e3b\u673aIp&#xff0c;\u6e90\u7aef\u53e3&#xff0c;\u5e94\u8be5\u662f\u64cd\u4f5c\u7cfb\u7edf\u968f\u673a\u5206\u914d\u4e00\u4e2a\u7aef\u53e3<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5c31\u50cf\u5b66\u751f\u53bb\u98df\u5802\u5403\u996d&#xff0c;\u98df\u5802\u63d0\u4f9b\u628a\u996d\u505a\u597d\u4e86\u7aef\u8fc7\u53bb\u7684\u670d\u52a1&#xff0c;\u5b66\u751f\u5728\u98df\u5802\u662f\u968f\u4fbf\u5750\u4e00\u6837<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/1.\u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u7684\u5185\u5bb9<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u8981\u53d1\u9001\u7684\u5185\u5bb9&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/2.\u628a\u8bf7\u6c42\u53d1\u9001\u7ed9\u670d\u52a1\u5668&#xff0c;\u9996\u5148\u6784\u9020\u6570\u636e\u62a5<\/span><br \/>\n            <span class=\"token class-name\">DatagramPacket<\/span> requestPacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">InetAddress<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getByName<\/span><span class=\"token punctuation\">(<\/span>serverIp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> serverPort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>requestPacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/3.\u63a5\u6536\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e\u62a5<\/span><br \/>\n            <span class=\"token class-name\">DatagramPacket<\/span> responsePacket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DatagramPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4096<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4096<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">receive<\/span><span class=\"token punctuation\">(<\/span>responsePacket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/4.\u8bfb\u53d6\u670d\u52a1\u5668\u7684\u6570\u636e<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span>responsePacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> responsePacket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLength<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">UdpEchoClient<\/span> client <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UdpEchoClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">9090<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        client<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bfb\u4ee3\u7801\u65f6\u91cd\u70b9\u770b\u4e09\u4ef6\u4e8b&#xff1a;<\/p>\n<li>UDP \u670d\u52a1\u7aef receive() \u4f1a\u963b\u585e\u7b49\u5f85&#xff1b;2) UDP \u5fc5\u987b\u5728\u53d1\u9001\u5305\u91cc\u6307\u5b9a\u5bf9\u7aef\u5730\u5740&#xff1b;3) \u201c\u4e00\u6b21\u4e00\u5305\u201d\u7684\u8fb9\u754c\u6765\u81ea DatagramPacket\u3002<\/li>\n<hr \/>\n<h3>5&#xff09;\u628a Echo \u6539\u9020\u6210\u201c\u82f1\u8bd1\u6c49\u201d&#xff1a;\u6838\u5fc3\u5c31\u662f\u6539 process<\/h3>\n<p>\u6765\u770b\u4e00\u4e2a\u975e\u5e38\u5b9e\u7528\u7684\u62bd\u8c61&#xff1a;\u670d\u52a1\u5668\u4e3b\u5faa\u73af\u57fa\u672c\u90fd\u4e00\u6837&#xff0c;\u5dee\u5f02\u5e38\u5e38\u53ea\u5728\u201c\u5982\u4f55\u5904\u7406 request \u5f97\u5230 response\u201d\u3002\u56e0\u6b64\u505a\u82f1\u8bd1\u6c49\u5b57\u5178\u670d\u52a1\u65f6&#xff0c;\u6838\u5fc3\u5c31\u662f\u628a process(request) \u6539\u6210\u201c\u67e5\u8868\u5e76\u8fd4\u56de\u201d\u3002<\/p>\n<p>&#xff08;\u5de5\u7a0b\u4e0a\u5e38\u89c1\u505a\u6cd5\u662f\u8ba9 process \u5177\u5907\u53ef\u6269\u5c55\u6027&#xff1a;\u4f8b\u5982\u6539\u6210 protected&#xff0c;\u518d\u7528\u7ee7\u627f\/\u7ec4\u5408\u6ce8\u5165\u4e0d\u540c\u5904\u7406\u903b\u8f91\u3002&#xff09;<\/p>\n<hr \/>\n<h3>6&#xff09;TCP \u7f16\u7a0b\u6a21\u578b&#xff1a;\u5148\u5efa\u7acb\u8fde\u63a5&#xff0c;\u518d\u7528\u5b57\u8282\u6d41\u6301\u7eed\u6536\u53d1<\/h3>\n<p>\u6765\u770b TCP \u7684\u5173\u952e\u533a\u522b&#xff1a;\u5b83\u662f\u9762\u5411\u8fde\u63a5\u7684\u3002\u901a\u4fe1\u524d\u8981\u5efa\u7acb\u8fde\u63a5&#xff1b;\u5efa\u7acb\u540e\u53cc\u65b9\u901a\u8fc7 InputStream\/OutputStream \u50cf\u8bfb\u5199\u6587\u4ef6\u4e00\u6837\u6536\u53d1\u6570\u636e\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222010548-699a566c5a32c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>Java \u91cc TCP \u7684\u4e24\u4e2a\u6838\u5fc3\u7c7b&#xff1a;<\/p>\n<ul>\n<li>\n<p>ServerSocket&#xff1a;\u7528\u6765\u521b\u5efa TCP \u670d\u52a1\u7aef\u76d1\u542c\u5957\u63a5\u5b57<\/p>\n<ul>\n<li>new ServerSocket(port)&#xff1a;\u7ed1\u5b9a\u7aef\u53e3<\/li>\n<li>accept()&#xff1a;\u963b\u585e\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u8fd4\u56de Socket<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>Socket&#xff1a;\u5ba2\u6237\u7aef socket&#xff1b;\u6216\u670d\u52a1\u7aef accept \u540e\u5f97\u5230\u7684\u8fde\u63a5 socket<\/p>\n<ul>\n<li>new Socket(host, port)&#xff1a;\u5ba2\u6237\u7aef\u53d1\u8d77\u8fde\u63a5<\/li>\n<li>getInputStream()\/getOutputStream()&#xff1a;\u83b7\u53d6\u8bfb\u5199\u6d41<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>7&#xff09;\u6765\u770b TCP \u56de\u663e&#xff1a;\u963b\u585e\u70b9\u3001\u6362\u884c\u534f\u8bae\u3001flush \u90fd\u5728\u8fd9\u91cc<\/h3>\n<p>\u4e0b\u9762\u662f\u5b8c\u6574\u53ef\u8fd0\u884c\u7248\u672c&#xff08;\u5e26\u6ce8\u91ca&#xff09;\u3002\u4ee3\u7801\u6765\u81ea\u538b\u7f29\u5305\u3002<\/p>\n<h4>7.1 TCP Echo Server&#xff08;\u670d\u52a1\u7aef&#xff1a;\u7ebf\u7a0b\u6c60\u5e76\u53d1\u7248&#xff09;<\/h4>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">network<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">InputStream<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">OutputStream<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">PrintWriter<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ServerSocket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Socket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ExecutorService<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TcpEchoServer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ServerSocket<\/span> serverSocket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>     <span class=\"token comment\">\/\/\u8fd9\u91cc\u548cUDP\u7c7b\u4f3c&#xff0c;\u4e5f\u662f\u5728\u6784\u9020\u5bf9\u8c61\u7684\u65f6\u5019\u7ed1\u5b9a\u7aef\u53e3<\/span><br \/>\n     <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">TcpEchoServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> port<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">{<\/span><br \/>\n         serverSocket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ServerSocket<\/span><span class=\"token punctuation\">(<\/span>port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token punctuation\">}<\/span><br \/>\n     <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">{<\/span><br \/>\n         <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u542f\u52a8\u670d\u52a1\u5668&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>         <span class=\"token comment\">\/\/\u8fd9\u79cd\u60c5\u51b5\u4e00\u822c\u4e0d\u4f7f\u7528\u56fa\u5b9a\u7ebf\u7a0b\u6570\u7684fixedThreadPool<\/span><br \/>\n         <span class=\"token class-name\">ExecutorService<\/span> executorService <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newCachedThreadPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n             <span class=\"token comment\">\/\/tcp\u6765\u8bf4&#xff0c;\u9700\u8981\u5148\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u8fde\u63a5<\/span><br \/>\n             <span class=\"token comment\">\/\/\u901a\u8fc7\u8bfb\u5199clientSocket\u548c\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1<\/span><br \/>\n             <span class=\"token comment\">\/\/\u5982\u679c\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u8d77\u8fde\u63a5&#xff0c;\u6b64\u65f6accept\u5c31\u4f1a\u963b\u585e<\/span><br \/>\n             <span class=\"token class-name\">Socket<\/span> clientSocket <span class=\"token operator\">&#061;<\/span> serverSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u6bcf\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684<\/span><br \/>\n                                                         <span class=\"token comment\">\/\/\u6bcf\u4e2a\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5&#xff0c;\u8fd9\u4e2a\u5bf9\u8c61\u90fd\u53ef\u4ee5\u4e0d\u8981\u4e86<\/span><br \/>\n             <span class=\"token comment\">\/\/\u4e3b\u7ebf\u7a0b\u5e94\u8be5\u590d\u6742\u8fdb\u884caccept,\u6bcf\u6b21accept\u5230\u4e00\u4e2a\u5ba2\u6237\u7aef\u5c31\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u8d1f\u8d23\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42<\/span><br \/>\n<span class=\"token comment\">\/\/             Thread t &#061; new Thread(() -&gt;{<\/span><br \/>\n<span class=\"token comment\">\/\/                 processConnection(clientSocket);<\/span><br \/>\n<span class=\"token comment\">\/\/             });<\/span><br \/>\n<span class=\"token comment\">\/\/             t.start();   \u8fd9\u6bb5\u591a\u7ebf\u7a0b\u4ee3\u7801\u80fd\u591f\u6b63\u5e38\u8fd0\u884c \u4f46\u8fd8\u53ef\u4ee5\u518d\u4f18\u5316 \u4f18\u5316\u539f\u56e0&#xff1a;\u5ba2\u6237\u7aef\u591a\u4e86 \u9891\u7e41\u7684\u521b\u5efa\u9500\u6bc1\u7ebf\u7a0b\u5360\u6bd4\u5f00\u9500\u5927 \u8fd9\u65f6\u5019\u5c31\u8be5\u5f15\u5165\u7ebf\u7a0b\u6c60<\/span><br \/>\n         executorService<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span><span class=\"token punctuation\">{<\/span><br \/>\n             <span class=\"token function\">processConnection<\/span><span class=\"token punctuation\">(<\/span>clientSocket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n         <span class=\"token comment\">\/\/\u591a\u7ebf\u7a0b\u548c\u7ebf\u7a0b\u6c60\u90fd\u610f\u5473\u7740\u4e00\u4e2a\u5ba2\u6237\u7aef\u5bf9\u5e94\u4e00\u4e2a\u7ebf\u7a0b<\/span><br \/>\n         <span class=\"token punctuation\">}<\/span><br \/>\n     <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u8fde\u63a5<\/span><br \/>\n    <span class=\"token comment\">\/\/\u53ef\u80fd\u6d89\u53ca\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u548c\u54cd\u5e94<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">processConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Socket<\/span> clientSocket<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s:%d] \u5ba2\u6237\u7aef\u4e0a\u7ebf&#xff01;\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getInetAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InputStream<\/span> inputStream <span class=\"token operator\">&#061;<\/span> clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">OutputStream<\/span> outputStream <span class=\"token operator\">&#061;<\/span> clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span>inputStream<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">PrintWriter<\/span> writer <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PrintWriter<\/span><span class=\"token punctuation\">(<\/span>outputStream<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5206\u6210\u4e09\u4e2a\u6b65\u9aa4<\/span><br \/>\n            <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/1.\u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790<\/span><br \/>\n                <span class=\"token comment\">\/**byte[] request &#061; new byte[1024];<br \/>\n                inputStream.read(request); **\/<\/span> <span class=\"token comment\">\/\/\u8fd9\u4e2aread\u7684\u64cd\u4f5c\u4f1a\u628aclientSocket\u7684\u4e1c\u897f\u5168\u90e8\u5199\u5230request\u6570\u7ec4\u91cc<\/span><br \/>\n                <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token comment\">\/\/\u5982\u679c\u5ba2\u6237\u7aef#1\u4e0d\u53d1\u8bf7\u6c42&#xff0c;\u90a3\u4e48\u670d\u52a1\u5668\u5c31\u4f1a\u963b\u585e\u5728\u6b64\u6ca1\u6cd5\u56de\u5e94\u5176\u4ed6\u5ba2\u6237\u7aef<\/span><br \/>\n                    <span class=\"token comment\">\/\/\u8fde\u63a5\u65ad\u5f00\u4e86<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/2.\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/3.\u8fd4\u56de\u54cd\u5e94\u5230\u5ba2\u6237\u7aef<\/span><br \/>\n                writer<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u548csout\u7c7b\u4f3c<\/span><br \/>\n                <span class=\"token comment\">\/\/\u8fd9\u4e2a\u64cd\u4f5c\u53ea\u662f\u628a\u6570\u636e\u653e\u5230&#034;\u53d1\u9001\u7f13\u51b2\u533a&#034;\u4e2d&#xff0c;\u8fd8\u6ca1\u6709\u771f\u6b63\u5199\u5165\u5230\u7f51\u5361\u91cc<\/span><br \/>\n                <span class=\"token comment\">\/\/\u52a0\u4e0a\u5237\u65b0\u7f13\u51b2\u533a\u64cd\u4f5c\u624d\u662f\u771f\u6b63\u53d1\u9001\u6570\u636e<\/span><br \/>\n                writer<span class=\"token punctuation\">.<\/span><span class=\"token function\">flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/\u6253\u5370\u65e5\u5fd7<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s:%d] req:%s,resp:%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getInetAddress<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>request<span class=\"token punctuation\">,<\/span>response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n         <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;this server accept your request &#061; &#034;<\/span> <span class=\"token operator\">&#043;<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">TcpEchoServer<\/span> server <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">TcpEchoServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9090<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        server<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>7.2 TCP Echo Client&#xff08;\u5ba2\u6237\u7aef&#xff09;<\/h4>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">network<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">InputStream<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">OutputStream<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">PrintWriter<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>net<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Socket<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TcpEchoClient<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Socket<\/span> socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">TcpEchoClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> serverIp<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> serverPort<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u76f4\u63a5\u628a\u5b57\u7b26\u4e32\u7684IP\u5730\u5740\u8bbe\u7f6e\u8fdb\u6765<\/span><br \/>\n        <span class=\"token comment\">\/\/127.0.0.1\u8fd9\u79cd\u5b57\u7b26\u4e32<\/span><br \/>\n        socket <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Socket<\/span><span class=\"token punctuation\">(<\/span>serverIp<span class=\"token punctuation\">,<\/span>serverPort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InputStream<\/span> inputStream <span class=\"token operator\">&#061;<\/span> socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">OutputStream<\/span> outputStream <span class=\"token operator\">&#061;<\/span> socket<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/\u4e3a\u4e86\u4f7f\u7528\u65b9\u4fbf&#xff0c;\u5957\u58f3\u64cd\u4f5c<\/span><br \/>\n            <span class=\"token class-name\">Scanner<\/span> scannerNet <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span>inputStream<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">PrintWriter<\/span> writer <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">PrintWriter<\/span><span class=\"token punctuation\">(<\/span>outputStream<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u8bf7\u6c42\u53d1\u9001\u7ed9\u670d\u52a1\u5668<\/span><br \/>\n            <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/1.\u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u7528\u6237\u8f93\u5165<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> request <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/2.\u53d1\u9001\u7ed9\u670d\u52a1\u5668<\/span><br \/>\n                writer<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/\u8fd9\u4e2a\u64cd\u4f5c\u53ea\u662f\u628a\u6570\u636e\u653e\u5230&#034;\u53d1\u9001\u7f13\u51b2\u533a&#034;\u4e2d&#xff0c;\u8fd8\u6ca1\u6709\u771f\u6b63\u5199\u5165\u5230\u7f51\u5361\u91cc<\/span><br \/>\n                <span class=\"token comment\">\/\/\u52a0\u4e0a\u5237\u65b0\u7f13\u51b2\u533a\u64cd\u4f5c\u624d\u662f\u771f\u6b63\u53d1\u9001\u6570\u636e<\/span><br \/>\n                writer<span class=\"token punctuation\">.<\/span><span class=\"token function\">flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/3.\u8bfb\u53d6\u670d\u52a1\u5668\u8fd4\u56de\u7684\u54cd\u5e94<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> response <span class=\"token operator\">&#061;<\/span> scannerNet<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/4.\u6253\u5370\u5230\u63a7\u5236\u53f0<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">TcpEchoClient<\/span> client <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">TcpEchoClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">9090<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        client<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bfb TCP \u8fd9\u5957\u4ee3\u7801\u65f6&#xff0c;\u76ef\u4f4f\u4e09\u4e2a\u5de5\u7a0b\u7ec6\u8282&#xff1a;<\/p>\n<ul>\n<li>accept() \u662f\u963b\u585e\u70b9&#xff1a;\u6ca1\u6709\u5ba2\u6237\u7aef\u8fde\u4e0a\u6765\u5c31\u4f1a\u4e00\u76f4\u7b49\u3002<\/li>\n<li>\u7528 println &#043; flush \u76f8\u5f53\u4e8e\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5f88\u7b80\u5355\u7684\u201c\u5e94\u7528\u5c42\u534f\u8bae\u201d&#xff1a;\u4e00\u884c\u4e00\u4e2a\u6d88\u606f&#xff0c;\u5426\u5219\u5bf9\u7aef\u8bfb\u53d6\u8fb9\u754c\u4f1a\u5f88\u75db\u82e6\u3002<\/li>\n<li>\u670d\u52a1\u7aef\u8981\u5e76\u53d1\u5c31\u5fc5\u987b\u201c\u4e00\u4e2a\u8fde\u63a5\u4ea4\u7ed9\u4e00\u4e2a\u7ebf\u7a0b\/\u4efb\u52a1\u201d&#xff0c;\u5426\u5219\u4e00\u4e2a\u5ba2\u6237\u7aef\u5361\u4f4f\u4f1a\u62d6\u6b7b\u6240\u6709\u4eba\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>8&#xff09;Socket \u7f16\u7a0b\u6ce8\u610f\u4e8b\u9879&#xff1a;\u7aef\u53e3\u5360\u7528\u3001\u76ee\u7684\u5730\u5740\u3001\u4ee5\u53ca\u201c\u522b\u5fd8\u4e86\u534f\u8bae\u201d<\/h3>\n<p>\u6765\u770b\u51e0\u4e2a\u771f\u5b9e\u4e16\u754c\u91cc\u6700\u5e38\u89c1\u7684\u5751&#xff1a;<\/p>\n<h4>8.1 \u76ee\u7684 IP &#043; \u76ee\u7684\u7aef\u53e3\u51b3\u5b9a\u201c\u4f60\u628a\u6570\u636e\u53d1\u7ed9\u8c01\u201d<\/h4>\n<p>\u4e00\u6b21\u6570\u636e\u4f20\u8f93\u91cc&#xff0c;\u76ee\u7684 IP &#043; \u76ee\u7684\u7aef\u53e3\u552f\u4e00\u6807\u8bc6\u4e86\u5bf9\u7aef\u4e3b\u673a\u548c\u5bf9\u7aef\u8fdb\u7a0b\u3002\u5199\u9519\u4e86\u5c31\u4e0d\u662f\u201c\u6536\u4e0d\u5230\u201d&#xff0c;\u800c\u662f\u201c\u53d1\u7ed9\u4e86\u522b\u7684\u5730\u65b9\u201d\u3002<\/p>\n<h4>8.2 \u7aef\u53e3\u88ab\u5360\u7528&#xff1a;\u540c\u4e00\u7aef\u53e3\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b\u7ed1\u5b9a<\/h4>\n<p>\u5982\u679c\u8fdb\u7a0b A \u5df2\u7ecf\u7ed1\u5b9a\u7aef\u53e3&#xff0c;\u518d\u8ba9\u8fdb\u7a0b B \u7ed1\u5b9a\u540c\u4e00\u7aef\u53e3\u4f1a\u62a5\u9519&#xff08;\u5178\u578b\u9519\u8bef&#xff1a;Address already in use&#xff09;\u3002\u6392\u67e5\u65b9\u5f0f&#xff1a;<\/p>\n<ul>\n<li>netstat -ano | findstr \u7aef\u53e3\u53f7 \u67e5\u5230 PID<\/li>\n<li>\u5728\u4efb\u52a1\u7ba1\u7406\u5668\u6309 PID \u627e\u5230\u5e76\u7ed3\u675f\u8fdb\u7a0b&#xff0c;\u6216\u6362\u4e00\u4e2a\u672a\u88ab\u5360\u7528\u7684\u7aef\u53e3<\/li>\n<\/ul>\n<h4>8.3 \u5e94\u7528\u5c42\u534f\u8bae\u4e0d\u80fd\u5ffd\u7565<\/h4>\n<p>\u5c31\u7b97\u5e95\u5c42\u7528 TCP\/UDP&#xff0c;\u5e94\u7528\u5c42\u4ecd\u9700\u8981\u7ea6\u5b9a\u201c\u6570\u636e\u600e\u4e48\u5206\u9694\u3001\u600e\u4e48\u89e3\u6790\u3001\u5b57\u6bb5\u600e\u4e48\u5b9a\u4e49\u201d\u3002\u5426\u5219\u53cc\u65b9\u8bfb\u5199\u4f1a\u4e92\u76f8\u6298\u78e8\u3002<\/p>\n<hr \/>\n<h3>9&#xff09;\u957f\u8fde\u63a5 vs \u77ed\u8fde\u63a5&#xff1a;\u4ec0\u4e48\u65f6\u5019\u5173\u8fde\u63a5\u51b3\u5b9a\u7cfb\u7edf\u5f62\u6001<\/h3>\n<p>\u6765\u770b\u4e00\u4e2a\u7ecf\u5178\u5206\u53c9&#xff1a;TCP 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