{"id":16703,"date":"2025-04-18T23:13:10","date_gmt":"2025-04-18T15:13:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/16703.html"},"modified":"2025-04-18T23:13:10","modified_gmt":"2025-04-18T15:13:10","slug":"%e5%9f%ba%e4%ba%8eudp%e5%92%8ctcp%e5%ae%9e%e7%8e%b0%e5%9b%9e%e6%98%be%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/16703.html","title":{"rendered":"\u57fa\u4e8eUDP\u548cTCP\u5b9e\u73b0\u56de\u663e\u670d\u52a1\u5668"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"%E4%B8%80.%20UDP%20%E5%9B%9E%E6%98%BE%E6%9C%8D%E5%8A%A1%E5%99%A8-toc\" style=\"margin-left:40px\">\u4e00. UDP \u56de\u663e\u670d\u52a1\u5668<\/p>\n<p id=\"1.%20UDP%20Echo%20Server-toc\" style=\"margin-left:80px\">1. UDP Echo Server<\/p>\n<p id=\"2.%20UDP%20Echo%20Client-toc\" style=\"margin-left:80px\">2. UDP Echo Client<\/p>\n<p id=\"%E4%BA%8C.%20TCP%20%E5%9B%9E%E6%98%BE%E6%9C%8D%E5%8A%A1%E5%99%A8-toc\" style=\"margin-left:40px\">\u4e8c. TCP \u56de\u663e\u670d\u52a1\u5668<\/p>\n<p id=\"1.%20TCP%20Echo%20Server-toc\" style=\"margin-left:80px\">1. TCP Echo Server<\/p>\n<p id=\"2.%20TCP%20Echo%20Client-toc\" style=\"margin-left:80px\">2. TCP Echo Client<\/p>\n<hr id=\"hr-toc\">\n<p>\u56de\u663e\u670d\u52a1\u5668 (Echo Server) \u5c31\u662f\u5ba2\u6237\u7aef\u53d1\u9001\u4ec0\u4e48\u6837\u7684\u8bf7\u6c42, \u670d\u52a1\u5668\u5c31\u8fd4\u56de\u4ec0\u4e48\u6837\u7684\u54cd\u5e94, \u6ca1\u6709\u4efb\u4f55\u7684\u8ba1\u7b97\u548c\u5904\u7406\u903b\u8f91.<\/p>\n<h3 id=\"%E4%B8%80.%20UDP%20%E5%9B%9E%E6%98%BE%E6%9C%8D%E5%8A%A1%E5%99%A8\">\u4e00. UDP \u56de\u663e\u670d\u52a1\u5668<\/h3>\n<h4 id=\"1.%20UDP%20Echo%20Server\">1. UDP Echo Server<\/h4>\n<p>\u4e0b\u9762\u5b9e\u73b0\u670d\u52a1\u5668.<\/p>\n<p>public class UdpEchoSever {<br \/>\n    private DatagramSocket socket = null;<br \/>\n    public UdpEchoSever(int port) throws SocketException {<br \/>\n        socket = new DatagramSocket(port); \/\/ \u521b\u5efa\u4e00\u4e2aDatagramSocket\u5bf9\u8c61,\u5e76\u7ed1\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7.<br \/>\n    }<\/p>\n<p>} <\/p>\n<p>(1) \u8fd9\u91cc\u58f0\u660e\u7684SocketException\u662fIOException\u7684\u5b50\u7c7b, \u662f\u7f51\u7edc\u7f16\u7a0b\u4e2d\u5e38\u89c1\u7684\u5f02\u5e38.<\/p>\n<p>(2) UdpEchoSever\u7684\u6784\u9020\u65b9\u6cd5\u65b9\u6cd5\u4e2d, \u5728\u8c03\u7528DatagramSocket\u7684\u6784\u9020\u65b9\u6cd5\u65f6, jvm\u5c31\u4f1a\u8c03\u7528\u7cfb\u7edfAPI, \u5b8c\u6210 \\&#8221;\u7aef\u53e3\u53f7 &#8211; \u8fdb\u7a0b\\&#8221; \u7684\u7ed1\u5b9a.<\/p>\n<p>(3) \u540c\u4e00\u65f6\u523b, \u4e00\u4e2a\u7aef\u53e3\u53f7\u53ea\u80fd\u7ed1\u5b9a\u4e00\u4e2a\u8fdb\u7a0b; \u800c\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u7aef\u53e3\u53f7.<\/p>\n<\/p>\n<p>public void start() throws IOException {<br \/>\n        System.out.println(\\&#8221;\u670d\u52a1\u5668\u542f\u52a8!\\&#8221;);<br \/>\n        while (true) {<br \/>\n            \/\/ \u6b64\u5904\u901a\u8fc7\u4e00\u4e2a\\&#8221;\u6b7b\u5faa\u73af\\&#8221;\u6765\u4e0d\u505c\u5730\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42.<br \/>\n            \/\/ 1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790.<br \/>\n            DatagramPacket requestPacket = new DatagramPacket(new byte[4096], 4096);<br \/>\n            socket.receive(requestPacket);<br \/>\n            String request = new String(requestPacket.getData(), 0, requestPacket.getLength());<\/p>\n<p>            \/\/ 2. \u6839\u636e\u8bf7\u6c42, \u8ba1\u7b97\u54cd\u5e94. (\u56de\u663e\u670d\u52a1\u5668, \u54cd\u5e94==\u8bf7\u6c42)<br \/>\n            String response = process(request);<\/p>\n<p>            \/\/ 3. \u628a\u54cd\u5e94\u5199\u56de\u5230\u5ba2\u6237\u7aef.<br \/>\n            DatagramPacket responsePacket = new DatagramPacket(response.getBytes(), response.getBytes().length,<br \/>\n                    requestPacket.getSocketAddress());<br \/>\n            socket.send(responsePacket);<\/p>\n<p>            \/\/ 4. \u6253\u5370\u65e5\u5fd7<br \/>\n            System.out.printf(\\&#8221;[%s:%d] req=%s, resp=%s\\\\n\\&#8221;, requestPacket.getAddress(), requestPacket.getPort(),<br \/>\n                    request, response);<br \/>\n        }<br \/>\n    } <\/p>\n<p>&nbsp;\u63a5\u4e0b\u6765\u6211\u4eec\u901a\u8fc7start()\u65b9\u6cd5\u7f16\u5199\u670d\u52a1\u5668\u7684\u6838\u5fc3\u6d41\u7a0b<\/p>\n<p>1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u8bf7\u6c42\u5e76\u89e3\u6790<\/p>\n<p>(1) \u670d\u52a1\u5668\u7684\u4e3b\u8981\u5de5\u4f5c, \u5c31\u662f\u4e0d\u505c\u5730\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u8bf7\u6c42. \u6240\u4ee5\u9700\u8981\u5199\u4e00\u4e2a while(true) \u6b7b\u5faa\u73af\u6765\u4e0d\u505c\u5730\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u8bf7\u6c42.<\/p>\n<p>(2) \u8fd9\u91cc\u7684 receive \u65b9\u6cd5: \u4e00\u8c03\u7528receive\u65b9\u6cd5, \u5c31\u4f1a\u5c31\u4ece\u7f51\u5361\u4e0a\u8bfb\u53d6\u6570\u636e, \u4f46\u662f\u6b64\u65f6\u7f51\u5361\u4e0a\u4e0d\u4e00\u5b9a\u6709\u6570\u636e,&nbsp;\u5982\u679c\u7f51\u5361\u4e0a\u6709\u6570\u636e, receive\u7acb\u5373\u8fd4\u56de\u83b7\u53d6\u5230\u7684\u6570\u636e; \u5982\u679c\u7f51\u5361\u4e0a\u6ca1\u6570\u636e, receive\u5c31\u4f1a\u963b\u585e\u7b49\u5f85, \u4e00\u76f4\u7b49\u5f85\u5230\u83b7\u53d6\u5230\u6570\u636e\u4e3a\u6b62.&nbsp; \u6b64\u5904receive\u4e2d\u7684\u7684\u53c2\u6570\u4e5f\u662f\\&#8221;\u8f93\u51fa\u578b\u53c2\u6570\\&#8221;, \u4ece\u7f51\u5361\u4e2d\u83b7\u53d6\u5230\u7684\u6570\u636e\u4f1a\u5b58\u5230requestPacket\u91cc\u9762.<\/p>\n<p>(3)&nbsp;receive\u63a5\u6536\u5230\u7684\u6570\u636e\u662f\u4e8c\u8fdb\u5236\u6570\u636e, \u4e3a\u4e86\u65b9\u4fbf\u540e\u7eed\u5904\u7406, \u6211\u4eec\u628a\u5b83\u8f6c\u6210\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u6570\u636e.<\/p>\n<\/p>\n<p>2. \u6839\u636e\u8bf7\u6c42, \u8ba1\u7b97\u54cd\u5e94&nbsp;&nbsp;<\/p>\n<p>\u56e0\u4e3a\u6211\u4eec\u8fd9\u91cc\u5b9e\u73b0\u7684\u662f\u56de\u663e\u670d\u52a1\u5668, \u6240\u4ee5\u54cd\u5e94 == \u8bf7\u6c42.<\/p>\n<\/p>\n<p>3. \u628a\u76f8\u5e94\u5199\u56de\u5ba2\u6237\u7aef<\/p>\n<p>\u7531\u4e8e\u6211\u4eec\u4e3a\u4e86\u65b9\u4fbf\u5904\u7406\u5427\u5b57\u8282\u6570\u7ec4\u8f6c\u6210\u4e86\u5b57\u7b26\u4e32, \u6240\u4ee5\u5728\u5f80\u56de\u53d1\u7684\u65f6\u5019\u9700\u8981<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb855\u6b21\uff0c\u70b9\u8d5e19\u6b21\uff0c\u6536\u85cf14\u6b21\u3002UDP\u548cTCP\u7684\u56de\u663e\u670d\u52a1\u5668\u7684Java\u5b9e\u73b0_udp echo<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,205,193,43,211],"topic":[],"class_list":["post-16703","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-tcp-ip","tag-udp","tag-43","tag-211"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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