{"id":26390,"date":"2025-04-19T15:31:16","date_gmt":"2025-04-19T07:31:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/26390.html"},"modified":"2025-04-19T15:31:16","modified_gmt":"2025-04-19T07:31:16","slug":"java-ee13-%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-udp-tcp%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\/26390.html","title":{"rendered":"Java EE(13)\u2014\u2014\u7f51\u7edc\u7f16\u7a0b\u2014\u2014UDP\/TCP\u56de\u663e\u670d\u52a1\u5668"},"content":{"rendered":"

\u524d\u8a00<\/h2>\n

\u672c\u6587\u4e3b\u8981\u4ecb\u7ecdUDP\u548cTCP\u76f8\u5173\u7684API，\u5e76\u4e14\u57fa\u4e8e\u8fd9\u4e24\u5957API\u5b9e\u73b0\u56de\u663e\u670d\u52a1\u5668<\/p>\n

UDP\u548cTCP<\/h2>\n

UDP\u548cTCP\u5c5e\u4e8e\u7f51\u7edc\u4e94\u5c42\u6a21\u578b\u4e2d\u4f20\u8f93\u5c42\u7684\u534f\u8bae \u7279\u70b9： UDP：\u65e0\u8fde\u63a5，\u4e0d\u53ef\u9760，\u9762\u5411\u6570\u636e\u5305，\u5168\u53cc\u5de5 TCP：\u6709\u8fde\u63a5，\u53ef\u9760，\u9762\u5411\u5b57\u8282\u6d41，\u5168\u53cc\u5de5 1.\u65e0\u8fde\u63a5\u548c\u6709\u8fde\u63a5 \u8fd9\u91cc\u6240\u8bf4\u7684\u8fde\u63a5\u4e0d\u662f\u6307\u7269\u7406\u610f\u4e49\u4e0a\u7684\u901a\u8fc7\u5b9e\u7269\u6765\u8fdb\u884c\u7ed1\u5b9a，\u800c\u662f\u865a\u62df\u7684\u8fde\u63a5\u3002\u4e3e\u4e2a\u4f8b\u5b50，\u4f60\u6253\u7535\u8bdd\u7ed9\u5bf9\u65b9，\u5bf9\u65b9\u63a5\u901a\u4e4b\u540e\u4f60\u624d\u80fd\u8fdb\u884c\u540e\u7eed\u901a\u4fe1，\u8fd9\u5c31\u662f\u6709\u8fde\u63a5；\u65e0\u8fde\u63a5\u5c31\u76f8\u5f53\u4e8eQQ\u53d1\u6d88\u606f，\u65e0\u8bba\u5bf9\u65b9\u662f\u5426\u540c\u610f，\u6d88\u606f\u90fd\u80fd\u53d1\u8fc7\u53bb 2.\u53ef\u9760\u548c\u4e0d\u53ef\u9760 \u4e0d\u8bba\u662f\u54ea\u79cd\u901a\u4fe1\u65b9\u5f0f，\u5b9e\u9645\u4e0a\u90fd\u65e0\u6cd5\u4fdd\u8bc1\u6570\u636e\u4e00\u5b9a\u80fd\u4f20\u8f93\u6210\u529f\u3002\u6240\u4ee5，\u8fd9\u91cc\u7684\u53ef\u9760\u6307\u7684\u662f，\u80fd\u83b7\u53d6\u5230\u6570\u636e\u7684\u4f20\u8f93\u60c5\u51b5\u3002\u5373\u4f7f\u4f20\u8f93\u5931\u8d25\u4e86\u6211\u80fd\u77e5\u9053\u5b83\u4f20\u8f93\u5931\u8d25\u4e86，\u91cd\u4f20\u5c31\u662f\u4e86；\u4e0d\u53ef\u9760\u6307\u7684\u662f\u4fe1\u606f\u4f20\u8f93\u4e4b\u540e\u5c31\u4e0d\u7ba1\u4e86，\u4f20\u8f93\u6210\u529f\u4e0e\u5426\u90fd\u548c\u6211\u65e0\u5173，\u66f4\u4e0d\u4f1a\u91cd\u4f20 3.\u5168\u53cc\u5de5\u548c\u534a\u53cc\u5de5 \u5168\u53cc\u5de5\u901a\u4fe1\u5141\u8bb8\u901a\u4fe1\u7684\u53cc\u65b9\u53ef\u4ee5\u540c\u65f6\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e，\u534a\u53cc\u5de5\u901a\u4fe1\u540c\u4e00\u65f6\u95f4\u5185\u53ea\u80fd\u5728\u540c\u4e00\u65b9\u5411\u4e0a\u4f20\u8f93<\/p>\n

\u4ec0\u4e48\u662f\u56de\u663e\u670d\u52a1\u5668<\/h2>\n

\u56de\u663e\u7684\u610f\u601d\u662f\u65e0\u8bba\u5ba2\u6237\u7aef\u7ed9\u670d\u52a1\u5668\u53d1\u9001\u4ec0\u4e48\u8bf7\u6c42，\u670d\u52a1\u5668\u4f1a\u628a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u539f\u6837\u8fd4\u56de<\/p>\n

1.UCP\u56de\u663e\u670d\u52a1\u5668<\/h2>\n

1.1API\u4ecb\u7ecd<\/h3>\n

Java\u4e2dUDP\u534f\u8bae\u7684API\u6709\u4e24\u4e2a，\u4e00\u4e2a\u662fDatagramSocket，\u4e00\u4e2a\u662fDatagramPacket<\/p>\n

1.1.1DatagramSocket\u7c7b<\/h4>\n

\u4f5c\u7528：\u7528\u4e8e\u5e94\u7528\u7a0b\u5e8f\u4e4b\u95f4\u53d1\u9001\u548c\u63a5\u6536UDP\u6570\u636e\u62a5 \u6784\u9020\u65b9\u6cd5：<\/p>\n

\/\/\u4e0d\u6307\u5b9a\u7aef\u53e3\u53f7，\u7531\u7cfb\u7edf\u968f\u673a\u5206\u914d<\/span>
\nDatagramSocket<\/span>(<\/span>)<\/span>
\n\/\/\u6307\u5b9a\u7aef\u53e3\u53f7<\/span>
\nDatagramSocket<\/span>(<\/span>int<\/span> port)<\/span><\/p>\n

\u5176\u4ed6\u65b9\u6cd5：<\/p>\n

\/\/\u63a5\u6536\u4e00\u4e2a\u6570\u636e\u62a5<\/span>
\nreceive<\/span>(<\/span>DatagramPacket<\/span> p)<\/span>
\n\/\/\u53d1\u9001\u4e00\u4e2a\u6570\u636e\u62a5<\/span>
\nsend<\/span>(<\/span>DatagramPacket<\/span> p)<\/span><\/p>\n

1.1.2DatagramPacket\u7c7b<\/h4>\n

\u4f5c\u7528：\u5c01\u88c5UDP\u6570\u636e\u62a5\u7684\u6570\u636e\u548c\u76ee\u6807\u5730\u5740\u4fe1\u606f\u3002\u5b83\u5305\u542b\u8981\u53d1\u9001\u7684\u6570\u636e，\u76ee\u7684\u4e3b\u673a\u7684\u7aef\u53e3\u53f7\u548cIP\u5730\u5740 \u6784\u9020\u65b9\u6cd5：<\/p>\n

\/\/\u5b57\u8282\u6570\u7ec4，\u5b57\u8282\u6570\u7ec4\u957f\u5ea6，\u670d\u52a1\u5668IP，\u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/span>
\n\/\/\u8fd9\u662f\u4f20\u5165\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u662f\u56fa\u5b9a\u503c，\u56e0\u4e3a\u670d\u52a1\u5668\u7684IP\u548c\u7aef\u53e3\u53f7\u4e00\u822c\u4e0d\u53d8<\/span>
\n\/\/\u6240\u4ee5\u4f5c\u4e3aDatagramSocket\u7c7b\u7684send\u65b9\u6cd5\u7684\u53c2\u6570，\u7528\u4e8e\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42<\/span>
\nDatagramPacket<\/span>(<\/span>byte<\/span> buf[<\/span>]<\/span>,<\/span> int<\/span> length,<\/span>InetAddress<\/span> address,<\/span> int<\/span> port)<\/span><\/p>\n

\/\/\u5b57\u8282\u6570\u7ec4，\u5b57\u8282\u6570\u7ec4\u957f\u5ea6<\/span>
\n\/\/\u8fd9\u4e2a\u548c\u4e0a\u9762\u6709\u6240\u4e0d\u540c，\u4e3b\u8981\u7528\u4e8e\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u8bf7\u6c42<\/span>
\n\/\/\u4e00\u4f1a\u4ee3\u7801\u518d\u5177\u4f53\u8bb2\u89e3<\/span>
\nDatagramPacket<\/span>(<\/span>byte<\/span> buf[<\/span>]<\/span>,<\/span> int<\/span> length,<\/span> SocketAddress<\/span> address)<\/span><\/p>\n

\/\/\u5b57\u8282\u6570\u7ec4，\u5b57\u8282\u6570\u7ec4\u957f\u5ea6<\/span>
\n\/\/\u4f5c\u4e3aDatagramSocket\u7c7b\u7684receive\u65b9\u6cd5\u7684\u53c2\u6570，\u7528\u4e8e\u5ba2\u6237\u7aef\u63a5\u6536\u670d\u52a1\u5668\u7684\u54cd\u5e94 \u6216\u8005 \u7528\u4e8e\u670d\u52a1\u5668\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42<\/span>
\nDatagramPacket<\/span>(<\/span>byte<\/span> buf[<\/span>]<\/span>,<\/span> int<\/span> length)<\/span><\/p>\n

1.2UDP\u56de\u663e\u670d\u52a1\u5668\u4ee3\u7801<\/h3>\n

import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>DatagramPacket<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>DatagramSocket<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>SocketException<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> EchoSever<\/span> {<\/span>
\n private<\/span> final<\/span> DatagramSocket<\/span> socket;<\/span>
\n \/\/\u4f20\u5165\u7aef\u53e3\u53f7<\/span>
\n public<\/span> EchoSever<\/span>(<\/span>int<\/span> port)<\/span> throws<\/span> SocketException<\/span> {<\/span>
\n socket =<\/span> new<\/span> DatagramSocket<\/span>(<\/span>port)<\/span>;<\/span>
\n }<\/span>
\n \/\/\u542f\u52a8\u670d\u52a1\u5668<\/span>
\n public<\/span> void<\/span> start<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u670d\u52a1\u5668\u542f\u52a8"<\/span>)<\/span>;<\/span>
\n \/\/\u670d\u52a1\u5668\u6b7b\u5faa\u73af\u5c31\u884c\u4e86，\u60f3\u8981\u5173\u95ed\u670d\u52a1\u5668\u76f4\u63a5\u6740\u8fdb\u7a0b<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
\n \/\/1.\u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790<\/span>
\n DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4096<\/span>]<\/span>,<\/span> 4096<\/span>)<\/span>;<\/span>
\n \/\/receive\u4ece\u7f51\u5361\u8bfb\u53d6\u5230UDP\u6570\u636e\u62a5，\u8f7d\u8377\u90e8\u5206\u653e\u5230byte\u6570\u7ec4\u91cc<\/span>
\n \/\/UDP\u62a5\u5934\u5b58\u653e\u5728requestPacket\u5176\u4ed6\u5c5e\u6027\u91cc<\/span>
\n \/\/\u8fd8\u80fd\u901a\u8fc7requestPacket\u77e5\u9053\u6e90IP\/\u7aef\u53e3<\/span>
\n \/\/receive\u5177\u6709\u963b\u585e\u529f\u80fd<\/span>
\n socket.<\/span>receive<\/span>(<\/span>requestPacket)<\/span>;<\/span>
\n \/\/\u5c06\u63a5\u6536\u5230\u7684\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/span>
\n \/\/requestPacket.getLength()\u5f97\u5230\u7684\u957f\u5ea6\u662f\u6709\u6548\u957f\u5ea6，\u4e0d\u4e00\u5b9a\u662f4096<\/span>
\n String<\/span> request =<\/span> new<\/span> String<\/span>(<\/span>requestPacket.<\/span>getData<\/span>(<\/span>)<\/span>,<\/span>0<\/span>,<\/span>requestPacket.<\/span>getLength<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n \/\/2.\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u76f8\u5e94(\u56de\u663e\u670d\u52a1\u5668\u5565\u90fd\u4e0d\u7528\u505a)<\/span>
\n String<\/span> response =<\/span> process<\/span>(<\/span>request)<\/span>;<\/span>
\n \/\/3.\u8fd4\u56de\u54cd\u5e94\u5230\u5ba2\u6237\u7aef<\/span>
\n \/\/response.getBytes()\u5f97\u5230String\u5185\u90e8\u7684\u5b57\u8282\u6570\u7ec4<\/span>
\n \/\/\u5f53String\u91cc\u9762\u5168\u90fd\u662f\u82f1\u6587\u5b57\u7b26\u7684\u65f6\u5019，response.length()\u662f\u53ef\u4ee5\u7684<\/span>
\n \/\/\u56e0\u4e3a\u4e00\u4e2a\u82f1\u6587\u5b57\u6bcd\u5bf9\u4e8e\u4e00\u4e2a\u5b57\u8282，\u4f46\u662f\u4e00\u4e2a\u6c49\u5b57\u5bf9\u5e94\u591a\u4e2a\u5b57\u8282<\/span>
\n \/\/requestPacket.getSocketAddress()\u627e\u5230\u5bf9\u5e94\u5ba2\u6237\u7aef\u7684IP\u548c\u7aef\u53e3\u53f7<\/span>
\n DatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>response.<\/span>getBytes<\/span>(<\/span>)<\/span>,<\/span>
\n response.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length,<\/span>requestPacket.<\/span>getSocketAddress<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n socket.<\/span>send<\/span>(<\/span>responsePacket)<\/span>;<\/span>
\n \/\/\u6253\u5370\u65e5\u5fd7<\/span>
\n \/\/IP,\u7aef\u53e3\u53f7,\u8bf7\u6c42,\u54cd\u5e94<\/span>
\n System<\/span>.<\/span>out.<\/span>printf<\/span>(<\/span>"[%s:%d] request:%s,response:%s\\\\n"<\/span>,<\/span>requestPacket.<\/span>getAddress<\/span>(<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>,<\/span>
\n responsePacket.<\/span>getPort<\/span>(<\/span>)<\/span>,<\/span>request,<\/span>response)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u76f8\u5e94<\/span>
\n public<\/span> String<\/span> process<\/span>(<\/span>String<\/span> request)<\/span>{<\/span>
\n return<\/span> request;<\/span>
\n }<\/span>
\n \/\/<\/span>
\n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n EchoSever<\/span> sever =<\/span> new<\/span> EchoSever<\/span>(<\/span>9090<\/span>)<\/span>;<\/span>
\n sever.<\/span>start<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u6ce8\u610f1：DatagramPacket responsePacket = new DatagramPacket(response.getBytes(), response.getBytes().length,requestPacket.getSocketAddress()); \u56e0\u4e3arequestPacket\u6570\u636e\u62a5\u4fdd\u5b58\u4e86\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7，\u6240\u4ee5\u901a\u8fc7getSocketAddress()\u80fd\u83b7\u53d6\u5230\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7 \/\/ \u5176\u6b21，\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u662f\u7cfb\u7edf\u968f\u673a\u5206\u914d\u7684，\u800c\u4e14\u670d\u52a1\u5668\u4f1a\u540c\u65f6\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8bf7\u6c42，\u8fd9\u4e9b\u5ba2\u6237\u7aef\u7684IP\u548c\u7aef\u53e3\u53f7\u90fd\u4e0d\u4e00\u6837，\u901a\u8fc7getSocketAddress()\u624d\u80fd\u6b63\u786e\u7684\u627e\u5230\u5bf9\u5e94\u5ba2\u6237\u7aef，\u800c\u4e0d\u662f\u8f93\u5165\u56fa\u5b9a\u7684IP\u548c\u7aef\u53e3\u53f7 \/\/ \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u8be5\u65b9\u6cd5\u7528\u4e8e\u670d\u52a1\u5668\u8fd4\u56de\u5ba2\u6237\u7aef\u7684\u54cd\u5e94，\u800cDatagramPacket(byte buf[], int length,InetAddress address, int port)\u7528\u4e8e\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42 \/\/ \u5bf9\u6bd4\u4e24\u4e2a\u65b9\u6cd5\u4e0d\u96be\u53d1\u73b0，\u524d\u8005\u83b7\u53d6\u5230\u7684IP\u548c\u7aef\u53e3\u53f7\u662f\u4e0d\u56fa\u5b9a\u7684，\u800c\u540e\u8005\u662f\u6307\u5b9aIP\u548c\u7aef\u53e3\u53f7 \u6ce8\u610f2：\u4e3a\u4ec0\u4e48\u670d\u52a1\u5668\u8981\u6307\u5b9a\u7aef\u53e3\u53f7？\u800c\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53f7\u662f\u968f\u673a\u5206\u914d？ \u8bb2\u670d\u52a1\u5668\u6bd4\u4f5c\u9910\u5385，\u5ba2\u6237\u7aef\u6bd4\u4f5c\u987e\u5ba2\u3002\u987e\u5ba2\u6765\u9910\u5385\u5403\u996d，\u5750\u7684\u684c\u5b50\u5c31\u76f8\u5f53\u4e8e\u7aef\u53e3\u53f7，\u987e\u5ba2\u4eca\u5929\u5750001\u53f7\u684c，\u6539\u5929\u5750002\u53f7\u684c，\u4eba\u5bb6\u4e50\u610f\u5750\u54ea\u5c31\u5750\u90a3；\u4f46\u662f\u9910\u5385\u7684\u4f4d\u7f6e\u80af\u5b9a\u662f\u56fa\u5b9a\u7684，\u4e0d\u53ef\u80fd\u4eca\u5929\u9910\u5385\u5728\u6cb3\u8fb9，\u660e\u5929\u9910\u5385\u5c31\u8dd1\u5230\u534a\u5c71\u8170\u53bb\u4e86\u5417，\u9910\u5385\u7684\u4f4d\u7f6e\u4e0d\u80fd\u6539\u53d8，\u5426\u5219\u987e\u5ba2\u627e\u4e0d\u5230\u9910\u5385\u7684\u4f4d\u7f6e<\/p>\n

1.2UDP\u5ba2\u6237\u7aef\u4ee3\u7801<\/h3>\n

import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>*<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>Scanner<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> EchoClient<\/span> {<\/span>
\n private<\/span> final<\/span> DatagramSocket<\/span> socket;<\/span>
\n \/\/\u8fd9\u91cc\u7684IP\u662fString<\/span>
\n private<\/span> final<\/span> String<\/span> severIP;<\/span>
\n private<\/span> final<\/span> int<\/span> severPort;<\/span>
\n \/\/\u4f20\u5165\u670d\u52a1\u5668IP\u548c\u7aef\u53e3<\/span>
\n public<\/span> EchoClient<\/span>(<\/span>String<\/span> severIP,<\/span>int<\/span> severPort)<\/span> throws<\/span> SocketException<\/span> {<\/span>
\n this<\/span>.<\/span>socket =<\/span> new<\/span> DatagramSocket<\/span>(<\/span>)<\/span>;<\/span>
\n this<\/span>.<\/span>severIP =<\/span> severIP;<\/span>
\n this<\/span>.<\/span>severPort =<\/span> severPort;<\/span>
\n }<\/span>
\n \/\/\u542f\u52a8\u5ba2\u6237\u7aef<\/span>
\n public<\/span> void<\/span> start<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u5ba2\u6237\u7aef\u542f\u52a8"<\/span>)<\/span>;<\/span>
\n Scanner<\/span> in =<\/span> new<\/span> Scanner<\/span>(<\/span>System<\/span>.<\/span>in)<\/span>;<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span>{<\/span>
\n \/\/\u63d0\u793a\u7528\u6237\u8981\u8f93\u5165\u8bf7\u6c42\u4e86<\/span>
\n System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>"-> "<\/span>)<\/span>;<\/span>
\n \/\/1.\u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u8981\u53d1\u9001\u7684\u8bf7\u6c42\u6570\u636e<\/span>
\n \/\/\u5728\u7528\u6237\u8f93\u5165\u4e4b\u524d\u6709\u963b\u585e\u6548\u679c<\/span>
\n if<\/span> (<\/span>!<\/span>in.<\/span>hasNext<\/span>(<\/span>)<\/span>)<\/span>{<\/span>
\n break<\/span>;<\/span>
\n }<\/span>
\n String<\/span> request =<\/span> in.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/2.\u8bf7\u6c42\u5e76\u53d1\u9001<\/span>
\n \/\/\u5b57\u8282\u6570\u7ec4，\u5b57\u8282\u6570\u7ec4\u957f\u5ea6，\u670d\u52a1\u5668IP，\u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/span>
\n DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>request.<\/span>getBytes<\/span>(<\/span>)<\/span>,<\/span>request.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length,<\/span>
\n InetAddress<\/span>.<\/span>getByName<\/span>(<\/span>severIP)<\/span>,<\/span>severPort)<\/span>;<\/span>
\n socket.<\/span>send<\/span>(<\/span>requestPacket)<\/span>;<\/span>
\n \/\/3.\u8bfb\u53d6\u670d\u52a1\u5668\u8fd4\u56de\u7684\u54cd\u5e94<\/span>
\n DatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4096<\/span>]<\/span>,<\/span>4096<\/span>)<\/span>;<\/span>
\n socket.<\/span>receive<\/span>(<\/span>responsePacket)<\/span>;<\/span>
\n \/\/4.\u5c06\u54cd\u5e94\u6253\u5370\u5230\u63a7\u5236\u53f0<\/span>
\n String<\/span> response =<\/span> new<\/span> String<\/span>(<\/span>responsePacket.<\/span>getData<\/span>(<\/span>)<\/span>,<\/span>0<\/span>,<\/span>responsePacket.<\/span>getLength<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>response)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/<\/span>
\n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n EchoClient<\/span> client =<\/span> new<\/span> EchoClient<\/span>(<\/span>"127.0.0.1"<\/span>,<\/span>9090<\/span>)<\/span>;<\/span>
\n client.<\/span>start<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

2.TCP\u56de\u663e\u670d\u52a1\u5668<\/h2>\n

2.1API\u4ecb\u7ecd<\/h3>\n

Java\u4e2dTCP\u534f\u8bae\u7684API\u6709\u4e24\u4e2a，\u4e00\u4e2a\u662fSeverSocket，\u4e00\u4e2a\u662fSocket<\/p>\n

2.1.1SeverSocket\u7c7b<\/h4>\n

\u4f5c\u7528：\u7528\u4e8e\u670d\u52a1\u5668\u76d1\u542c\u6765\u81ea\u5ba2\u6237\u7aef\u7684TCP\u8fde\u63a5\u8bf7\u6c42 \u6784\u9020\u65b9\u6cd5：<\/p>\n

\/\/\u4e0d\u6307\u5b9a\u7aef\u53e3\u53f7，\u7531\u7cfb\u7edf\u968f\u673a\u5206\u914d<\/span>
\nServerSocket<\/span>(<\/span>)<\/span>
\n\/\/\u6307\u5b9a\u7aef\u53e3\u53f7<\/span>
\nServerSocket<\/span>(<\/span>int<\/span> port)<\/span><\/p>\n

\u5176\u4ed6\u65b9\u6cd5：<\/p>\n

\/\/\u76d1\u542c\u5e76\u63a5\u53d7\u5ba2\u6237\u7aef\u4f20\u5165\u7684\u8fde\u63a5\u8bf7\u6c42\u3002\u6b64\u65b9\u6cd5\u6709\u963b\u585e\u6548\u679c，\u76f4\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5<\/span>
\nSocket<\/span> accept<\/span>(<\/span>)<\/span>:<\/span><\/p>\n

2.1.2Socket\u7c7b<\/h4>\n

\u4f5c\u7528：\u4e3b\u8981\u7528\u4e8e\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u5efa\u7acbTCP\u8fde\u63a5 \u6784\u9020\u65b9\u6cd5：<\/p>\n

\/\/\u901a\u8fc7\u4f20\u5165IP\u548c\u7aef\u53e3\u53f7\u8fde\u63a5\u5230\u6307\u5b9a\u7684\u4e3b\u673a(\u670d\u52a1\u5668)<\/span>
\nSocket<\/span>(<\/span>String<\/span> host,<\/span> int<\/span> port)<\/span><\/p>\n

\u5176\u4ed6\u65b9\u6cd5：<\/p>\n

\/\/\u8fd4\u56de\u6b64\u5957\u63a5\u5b57(\u5b9e\u4f8b)\u7684\u8f93\u5165\u6d41，\u7528\u4e8e\u63a5\u6536\u6570\u636e<\/span>
\ngetInputStream<\/span>(<\/span>)<\/span>
\n\/\/\u8fd4\u56de\u6b64\u5957\u63a5\u5b57(\u5b9e\u4f8b)\u7684\u8f93\u51fa\u6d41，\u7528\u4e8e\u53d1\u9001\u6570\u636e<\/span>
\ngetOutputStream<\/span>(<\/span>)<\/span><\/p>\n

2.1TCP\u56de\u663e\u670d\u52a1\u5668\u4ee3\u7801<\/h3>\n

import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>io.<\/span><\/span>InputStream<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>io.<\/span><\/span>OutputStream<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>io.<\/span><\/span>PrintWriter<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>ServerSocket<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>Socket<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>Scanner<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> TCPEchoSever<\/span> {<\/span>
\n private<\/span> final<\/span> ServerSocket<\/span> socket;<\/span>
\n \/\/<\/span>
\n public<\/span> TCPEchoSever<\/span>(<\/span>int<\/span> port)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n socket =<\/span> new<\/span> ServerSocket<\/span>(<\/span>port)<\/span>;<\/span>
\n }<\/span>
\n \/\/\u542f\u52a8\u670d\u52a1\u5668<\/span>
\n private<\/span> void<\/span> start<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u670d\u52a1\u5668\u542f\u52a8"<\/span>)<\/span>;<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span>{<\/span>
\n \/\/\u5c06\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u8fde\u63a5<\/span>
\n \/\/accept()\u6709\u963b\u585e\u6548\u679c，\u7b49\u5f85\u5ba2\u6237\u7aef\u5efa\u7acb\u8054\u7cfb<\/span>
\n Socket<\/span> clientSocket =<\/span> socket.<\/span>accept<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/\u6bcf\u4e0e\u4e00\u4e2a\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5，\u90fd\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6765\u6267\u884c\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42<\/span>
\n Thread<\/span> thread =<\/span> new<\/span> Thread<\/span>(<\/span>(<\/span>)<\/span>-><\/span>{<\/span>
\n \/\/\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u4ea4\u4e92<\/span>
\n try<\/span> {<\/span>
\n processConnection<\/span>(<\/span>clientSocket)<\/span>;<\/span>
\n }<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
\n throw<\/span> new<\/span> RuntimeException<\/span>(<\/span>e)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>)<\/span>;<\/span>
\n thread.<\/span>start<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/<\/span>
\n public<\/span> void<\/span> processConnection<\/span>(<\/span>Socket<\/span> clientSocket)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n System<\/span>.<\/span>out.<\/span>printf<\/span>(<\/span>"[%s:%d] \u670d\u52a1\u5668\u4e0a\u7ebf\\\\n"<\/span>,<\/span>clientSocket.<\/span>getInetAddress<\/span>(<\/span>)<\/span>,<\/span>clientSocket.<\/span>getPort<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n \/\/inputStream\u4ece\u7f51\u5361\u8bfb\u6570\u636e<\/span>
\n try<\/span>(<\/span>InputStream<\/span> inputStream =<\/span> clientSocket.<\/span>getInputStream<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/OutputStream\u5f80\u7f51\u5361\u5199\u6570\u636e<\/span>
\n OutputStream<\/span> outputStream =<\/span> clientSocket.<\/span>getOutputStream<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n \/\/\u4ece\u7f51\u5361\u8bfb\u6570\u636e<\/span>
\n \/\/byte[] array = new byte[1024];int ret = inputStream.read(array);<\/span>
\n PrintWriter<\/span> printWriter =<\/span> new<\/span> PrintWriter<\/span>(<\/span>outputStream)<\/span>;<\/span>
\n Scanner<\/span> scanner =<\/span> new<\/span> Scanner<\/span>(<\/span>inputStream)<\/span>;<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span>{<\/span>
\n \/\/\u8bfb\u53d6\u5b8c\u6bd5，\u5f53\u5ba2\u6237\u7aef\u4e0b\u7ebf\u7684\u65f6\u5019\u4ea7\u751f<\/span>
\n \/\/\u5728\u7528\u6237\u8f93\u5165\u4e4b\u524d，hasNext()\u6709\u963b\u585e\u6548\u679c<\/span>
\n \/\/\u5f53\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5\u65f6，scanner.hasNext()\u8fd4\u56defalse\u5e76\u4e2d\u65ad\u5faa\u73af<\/span>
\n if<\/span> (<\/span>!<\/span>scanner.<\/span>hasNext<\/span>(<\/span>)<\/span>)<\/span>{<\/span>
\n System<\/span>.<\/span>out.<\/span>printf<\/span>(<\/span>"[%s:%d] \u5ba2\u6237\u7aef\u4e0b\u7ebf\\\\n"<\/span>,<\/span>clientSocket.<\/span>getInetAddress<\/span>(<\/span>)<\/span>,<\/span>clientSocket.<\/span>getPort<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n break<\/span>;<\/span>
\n }<\/span>
\n \/\/1.\u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790<\/span>
\n \/\/\u7528\u6237\u4f20\u8fc7\u6765\u7684\u8bf7\u6c42\u5fc5\u987b\u5e26\u6709\u7a7a\u767d\u7b26，\u6ca1\u6709\u7684\u8bdd\u5c31\u4f1a\u963b\u585e<\/span>
\n String<\/span> request =<\/span> scanner.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/2.\u8ba1\u7b97\u54cd\u5e94<\/span>
\n String<\/span> response =<\/span> process<\/span>(<\/span>request)<\/span>;<\/span>
\n \/\/3.\u8fd4\u56de\u54cd\u5e94<\/span>
\n \/\/outputStream.write(response.getBytes(),0,response.getBytes().length);\/\/\u8fd9\u4e2a\u65b9\u5f0f\u4e0d\u65b9\u4fbf\u6dfb\u52a0\u7a7a\u767d\u7b26<\/span>
\n \/\/\u901a\u8fc7PrintWriter\u6765\u5c01\u88c5outputStream<\/span>
\n \/\/\u6dfb\u52a0\\\\n<\/span>
\n printWriter.<\/span>println<\/span>(<\/span>response)<\/span>;<\/span>
\n \/\/\u5237\u65b0\u7f13\u51b2\u533a<\/span>
\n printWriter.<\/span>flush<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/\u6253\u5370\u65e5\u5fd7<\/span>
\n System<\/span>.<\/span>out.<\/span>printf<\/span>(<\/span>"[%s:%d] request:%s,response:%s\\\\n"<\/span>,<\/span>clientSocket.<\/span>getInetAddress<\/span>(<\/span>)<\/span>,<\/span>
\n clientSocket.<\/span>getPort<\/span>(<\/span>)<\/span>,<\/span>request,<\/span>response)<\/span>;<\/span>
\n }<\/span>
\n }<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
\n throw<\/span> new<\/span> RuntimeException<\/span>(<\/span>e)<\/span>;<\/span>
\n }<\/span>finally<\/span> {<\/span>
\n clientSocket.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/\u8ba1\u7b97\u54cd\u5e94<\/span>
\n private<\/span> String<\/span> process<\/span>(<\/span>String<\/span> request)<\/span> {<\/span>
\n return<\/span> request;<\/span>
\n }<\/span>
\n \/\/<\/span>
\n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n TCPEchoSever<\/span> sever =<\/span> new<\/span> TCPEchoSever<\/span>(<\/span>9090<\/span>)<\/span>;<\/span>
\n sever.<\/span>start<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u6ce8\u610f：\u4e3a\u4ec0\u4e48\u8981\u8c03\u7528clientSocket.close()？ \u56e0\u4e3a\u6bcf\u548c\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2aclientSocket\u5957\u63a5\u5b57，\u5b83\u8d1f\u8d23\u548c\u5ba2\u6237\u7aef\u4ea4\u4e92，\u5373\u4fbf\u5ba2\u6237\u7aef\u8fdb\u7a0b\u7ec8\u6b62\u4e86，\u5ba2\u6237\u7aef\u7684socket\u4f1a\u88ab\u64cd\u4f5c\u7cfb\u7edf\u56de\u6536，\u4f46\u670d\u52a1\u5668\u4e2d\u7684clientSocket\u4ecd\u7136\u4f1a\u5360\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26\u548c\u5185\u5b58\u8d44\u6e90\u3002\u5f53\u6587\u4ef6\u8d44\u6e90\u8017\u5c3d\u65f6，\u5c31\u65e0\u6cd5\u4e0e\u65b0\u7684\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5<\/p>\n

2.2TCP\u5ba2\u6237\u7aef\u4ee3\u7801<\/h3>\n

import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>io.<\/span><\/span>InputStream<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>io.<\/span><\/span>OutputStream<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>io.<\/span><\/span>PrintWriter<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>net.<\/span><\/span>Socket<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>Scanner<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> TCPEchoClient<\/span> {<\/span>
\n private<\/span> final<\/span> Socket<\/span> socket;<\/span>
\n public<\/span> TCPEchoClient<\/span>(<\/span>String<\/span> severIp,<\/span>int<\/span> port)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n \/\/\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8054\u7cfb<\/span>
\n socket =<\/span> new<\/span> Socket<\/span>(<\/span>severIp,<\/span>port)<\/span>;<\/span>
\n }<\/span>
\n \/\/<\/span>
\n public<\/span> void<\/span> start<\/span>(<\/span>)<\/span>{<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u5ba2\u6237\u7aef\u542f\u52a8"<\/span>)<\/span>;<\/span>
\n try<\/span>(<\/span>InputStream<\/span> inputStream =<\/span> socket.<\/span>getInputStream<\/span>(<\/span>)<\/span>;<\/span>
\n OutputStream<\/span> outputStream =<\/span> socket.<\/span>getOutputStream<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n \/\/\u8bfb\u53d6\u63a7\u5236\u53f0<\/span>
\n Scanner<\/span> scannerConsole =<\/span> new<\/span> Scanner<\/span>(<\/span>System<\/span>.<\/span>in)<\/span>;<\/span>
\n Scanner<\/span> scannerNetWork =<\/span> new<\/span> Scanner<\/span>(<\/span>inputStream)<\/span>;<\/span>
\n PrintWriter<\/span> printWriter =<\/span> new<\/span> PrintWriter<\/span>(<\/span>outputStream)<\/span>;<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span>{<\/span>
\n System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>"->"<\/span>)<\/span>;<\/span>
\n \/\/\u5728\u7528\u6237\u8f93\u5165\u4e4b\u524d，hasNext()\u6709\u963b\u585e\u6548\u679c<\/span>
\n if<\/span> (<\/span>!<\/span>scannerConsole.<\/span>hasNext<\/span>(<\/span>)<\/span>)<\/span>{<\/span>
\n break<\/span>;<\/span>
\n }<\/span>
\n \/\/1.\u4ece\u63a7\u5236\u53f0\u8f93\u5165\u8bf7\u6c42<\/span>
\n String<\/span> request =<\/span> scannerConsole.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/2.\u53d1\u9001\u8bf7\u6c42<\/span>
\n \/\/\u8ba9\u8bf7\u6c42\u7684\u7ed3\u5c3e\u6709\\\\n<\/span>
\n printWriter.<\/span>println<\/span>(<\/span>request)<\/span>;<\/span>
\n \/\/\u5237\u65b0\u7f13\u51b2\u533a<\/span>
\n printWriter.<\/span>flush<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/3.\u4ece\u670d\u52a1\u5668\u8bfb\u53d6\u54cd\u5e94<\/span>
\n String<\/span> response =<\/span> scannerNetWork.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>
\n \/\/4.\u5c06\u54cd\u5e94\u6253\u5370\u5230\u63a7\u5236\u53f0<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>response)<\/span>;<\/span>
\n }<\/span>
\n }<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>
\n throw<\/span> new<\/span> RuntimeException<\/span>(<\/span>e)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/<\/span>
\n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> IOException<\/span> {<\/span>
\n TCPEchoClient<\/span> client =<\/span> new<\/span> TCPEchoClient<\/span>(<\/span>"127.0.0.1"<\/span>,<\/span>9090<\/span>)<\/span>;<\/span>
\n client.<\/span>start<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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