{"id":40156,"date":"2025-05-28T08:36:22","date_gmt":"2025-05-28T00:36:22","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/40156.html"},"modified":"2025-05-28T08:36:22","modified_gmt":"2025-05-28T00:36:22","slug":"%e7%bd%91%e7%bb%9c%e5%8e%9f%e7%90%86-tcp%e4%b8%8eudp%e5%8d%8f%e8%ae%ae%e7%9a%84%e5%8c%ba%e5%88%ab%e4%bb%a5%e5%8f%8a%e5%9b%9e%e6%98%be%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%9a%84%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/40156.html","title":{"rendered":"\u7f51\u7edc\u539f\u7406 | TCP\u4e0eUDP\u534f\u8bae\u7684\u533a\u522b\u4ee5\u53ca\u56de\u663e\u670d\u52a1\u5668\u7684\u5b9e\u73b0"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

TCP\u4e0eUDP\u534f\u8bae\u7684\u533a\u522b<\/p>\n

\u57fa\u4e8e UDP \u534f\u8bae\u5b9e\u73b0\u56de\u663e\u670d\u52a1\u5668\u00a0<\/p>\n

UDP Socket \u7f16\u7a0b\u5e38\u7528 Api<\/p>\n

UDP \u670d\u52a1\u5668<\/p>\n

UDP \u5ba2\u6237\u7aef<\/p>\n

\u57fa\u4e8e TCP \u534f\u8bae\u5b9e\u73b0\u56de\u663e\u670d\u52a1\u5668<\/p>\n

TCP Socket \u7f16\u7a0b\u5e38\u7528 Api<\/p>\n

TCP \u670d\u52a1\u5668<\/p>\n

TCP \u5ba2\u6237\u7aef\u00a0<\/p>\n

TCP \u670d\u52a1\u7aef\u5e38\u89c1\u7684\u00a0bug\u00a0<\/p>\n

\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u540e，\u6ca1\u6709\u54cd\u5e94<\/p>\n

\u670d\u52a1\u5668\u4ec5\u652f\u6301\u4e0e\u4e00\u4e2a\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u00a0<\/p>\n

\n

TCP\u4e0eUDP\u534f\u8bae\u7684\u533a\u522b<\/h2>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f20\u8f93\u63a7\u5236\u534f\u8bae（TCP）\u4e0e \u7528\u6237\u6570\u636e\u62a5\u534f\u8bae（UDP）\u662f\u4f20\u8f93\u5c42\u4e24\u4e2a\u91cd\u8981\u7684\u534f\u8bae，\u4e8c\u8005\u4e92\u8865\u5171\u5b58，\u5171\u540c\u652f\u6491\u4e92\u8054\u7f51\u7684\u591a\u5c42\u6b21\u4f20\u8f93\u9700\u6c42\u3002<\/p>\n

\u00a0\u4e8c\u8005\u7684\u533a\u522b\u5982\u4e0b：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00b7 TCP \u534f\u8bae\u662f\u6709\u8fde\u63a5\u7684\u3001\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u5b57\u8282\u6d41\u3001\u5168\u53cc\u5de5<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00b7 UDP \u534f\u8bae\u662f\u65e0\u8fde\u63a5\u7684\u3001\u4e0d\u53ef\u9760\u4f20\u8f93\u3001\u9762\u5411\u6570\u636e\u62a5\u3001\u5168\u53cc\u5de5<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5176\u4e2d\u6709\/\u65e0\u8fde\u63a5\u662f\u6307：\u5982\u679c\u901a\u4fe1\u53cc\u65b9\u4fdd\u5b58\u4e86\u901a\u4fe1\u5bf9\u7aef\u7684\u4fe1\u606f，\u5c31\u76f8\u5f53\u4e8e\u662f\u6709\u8fde\u63a5；\u5982\u679c\u4e0d\u4fdd\u5b58\u5bf9\u7aef\u7684\u4fe1\u606f，\u5c31\u662f\u65e0\u8fde\u63a5\u3002\u00a0<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u53ef\u9760\u4f20\u8f93\/\u4e0d\u53ef\u9760\u4f20\u8f93：\u6b64\u5904\u7684\u53ef\u9760\u4e0d\u662f\u6307 100% \u80fd\u5230\u8fbe\u5bf9\u65b9，\u800c\u662f\u6307\u201c\u5c3d\u53ef\u80fd\u201d\u786e\u4fdd\u6570\u636e\u7684\u4f20\u8f93，\u800c\u201c\u4e0d\u53ef\u9760\u201d\u5219\u610f\u5473\u7740\u5b8c\u5168\u4e0d\u4fdd\u8bc1\u6570\u636e\u662f\u5426\u80fd\u6210\u529f\u5230\u8fbe\u5bf9\u65b9\u3002TCP \u901a\u8fc7\u4e00\u4e9b\u5185\u7f6e\u673a\u5236（\u786e\u8ba4\u5e94\u7b54\u673a\u5236\u3001\u91cd\u4f20\u673a\u5236\u7b49）\u4fdd\u8bc1\u4e86\u53ef\u9760\u4f20\u8f93，UDP\u5219\u6ca1\u6709\u53ef\u9760\u6027\u673a\u5236\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u9762\u5411\u5b57\u8282\u6d41\/\u9762\u5411\u6570\u636e\u62a5：TCP \u662f\u9762\u5411\u5b57\u8282\u6d41\u7684，TCP \u7684\u4f20\u8f93\u8fc7\u7a0b\u5c31\u548c\u6587\u4ef6\u6d41\/\u6c34\u6d41\u662f\u4e00\u6837\u7684；\u800c UDP \u662f\u9762\u5411\u6570\u636e\u62a5\u7684，\u5176\u4f20\u8f93\u6570\u636e\u7684\u57fa\u672c\u5355\u4f4d\u662f\u6570\u636e\u62a5，\u4e00\u6b21\u53d1\u9001\/\u63a5\u6536\u5fc5\u987b\u53d1\u9001\/\u63a5\u6536\u5b8c\u6574\u7684\u6570\u636e\u62a5\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5168\u53cc\u5de5\/\u534a\u53cc\u5de5：\u5168\u53cc\u5de5\u662f\u6307\u4e00\u4e2a\u901a\u4fe1\u94fe\u8def\u65e2\u53ef\u4ee5\u53d1\u9001\u6570\u636e\u4e5f\u53ef\u4ee5\u63a5\u6536\u6570\u636e（\u53cc\u5411\u901a\u4fe1），\u534a\u53cc\u5de5\u662f\u6307\u4e00\u4e2a\u901a\u4fe1\u94fe\u8def\u53ea\u80fd\u53d1\u9001\/\u63a5\u6536\u6570\u636e（\u5355\u5411\u901a\u4fe1）\u3002<\/p>\n

TCP \u548c UDP \u7684\u9009\u62e9\u4ee5\u53ca\u9002\u7528\u573a\u666f：<\/p>\n

\u00b7 \u5f53\u6570\u636e\u51c6\u786e\u6027 > \u4f20\u8f93\u5ef6\u8fdf\u65f6（\u4f8b\u5982\u8f6f\u4ef6\u66f4\u65b0\u4e0b\u8f7d\u3001\u6587\u4ef6\u4f20\u8f93\u3001\u7f51\u9875\u6d4f\u89c8\u7b49\u573a\u666f），\u9009\u62e9 TCP\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u56e0\u4e3a TCP \u80fd\u591f\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u4f20\u8f93，\u901a\u8fc7\u786e\u8ba4\u5e94\u7b54\u3001\u91cd\u4f20\u673a\u5236\u7b49\u624b\u6bb5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u51c6\u786e\u6027，\u9002\u7528\u4e8e\u5bf9\u6570\u636e\u4f20\u8f93\u51c6\u786e\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u5e94\u7528\u3002<\/p>\n

\u00b7 \u5f53\u5b9e\u65f6\u6027 > \u6570\u636e\u5b8c\u6574\u6027\u65f6（\u4f8b\u5982\u591a\u4eba\u6e38\u620f\u540c\u6b65\u3001\u5728\u7ebf\u89c6\u9891\u4f1a\u8bae\u3001\u5b9e\u65f6\u8bed\u97f3\u901a\u8bdd\u7b49\u573a\u666f），\u9009\u62e9 UDP\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0UDP\u9002\u7528\u4e8e\u5bf9\u5b9e\u65f6\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u666f，\u867d\u7136\u5b83\u4e0d\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027，\u4f46\u80fd\u51cf\u5c11\u5ef6\u8fdf，\u786e\u4fdd\u6570\u636e\u4f20\u8f93\u7684\u5b9e\u65f6\u6027\u3002\u7279\u522b\u662f\u5728\u5b9e\u65f6\u901a\u4fe1\u4e2d，\u4e22\u5931\u5c11\u91cf\u6570\u636e\u5305\u5bf9\u7528\u6237\u4f53\u9a8c\u7684\u5f71\u54cd\u76f8\u5bf9\u8f83\u5c0f，\u800c\u8fc7\u9ad8\u7684\u5ef6\u8fdf\u53ef\u80fd\u5f71\u54cd\u6574\u4f53\u4f53\u9a8c\u3002<\/p>\n

\u57fa\u4e8e UDP \u534f\u8bae\u5b9e\u73b0\u56de\u663e\u670d\u52a1\u5668\u00a0<\/h2>\n

UDP Socket \u7f16\u7a0b\u5e38\u7528 Api<\/h3>\n

\u00b7 DatagramSocket：\u662f\u4e00\u79cd\u7528\u4e8e\u7f51\u7edc\u901a\u4fe1\u7684\u5957\u63a5\u5b57\u5bf9\u8c61，\u4ee3\u8868\u4e86\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u4e00\u4e2a\u7279\u5b9a\u7c7b\u578b\u7684\u201c\u6587\u4ef6\u201d\u8d44\u6e90\u3002\u53ef\u4ee5\u5c06\u5176\u7406\u89e3\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u7f51\u7edc\u8bbe\u5907（\u5982\u7f51\u5361）\u7684\u4e00\u79cd\u62bd\u8c61\u8868\u793a，\u5c31\u50cf\u64cd\u4f5c\u7cfb\u7edf\u5c06\u786c\u76d8\u3001\u952e\u76d8\u7b49\u8bbe\u5907\u62bd\u8c61\u4e3a\u6587\u4ef6\u4e00\u6837，DatagramSocket \u62bd\u8c61\u4e86\u7f51\u7edc\u6570\u636e\u7684\u53d1\u9001\u4e0e\u63a5\u6536\u901a\u9053\u3002\u5b83\u4e13\u95e8\u7528\u4e8e\u901a\u8fc7 UDP（\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae） \u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u62a5（Datagram），\u652f\u6301\u65e0\u8fde\u63a5\u3001\u4e0d\u53ef\u9760\u4f46\u9ad8\u6548\u7684\u901a\u4fe1\u65b9\u5f0f\u3002\u901a\u8fc7 DatagramSocket，\u5e94\u7528\u7a0b\u5e8f\u80fd\u591f\u5c06\u6570\u636e\u4ee5\u6570\u636e\u62a5\u7684\u5f62\u5f0f\u53d1\u9001\u5230\u76ee\u6807\u5730\u5740，\u540c\u65f6\u4e5f\u80fd\u63a5\u6536\u6765\u81ea\u7f51\u7edc\u4e0a\u5176\u4ed6\u8282\u70b9\u7684\u6570\u636e\u62a5，\u5b9e\u73b0\u8f7b\u91cf\u7ea7\u7684\u7f51\u7edc\u901a\u4fe1\u3002<\/p>\n

\u00b7 DatagramSocket\u7684\u6784\u9020\u65b9\u6cd5\u5305\u62ec\u4ee5\u4e0b\u4e24\u79cd\u5f62\u5f0f：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 DatagramSocket()：\u521b\u5efa\u4e00\u4e2a UDP \u6570\u636e\u62a5\u5957\u63a5\u5b57\u7684 Socket，\u7ed1\u5b9a\u5230\u672c\u673a\u4efb\u610f\u4e00\u4e2a\u968f\u673a\u7aef\u53e3（\u901a\u5e38\u7528\u4e8e\u5ba2\u6237\u7aef）<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 DatagramSocket(int port)：\u521b\u5efa\u4e00\u4e2a UDP \u6570\u636e\u62a5\u5957\u63a5\u5b57\u7684 Socket，\u7ed1\u5b9a\u5230\u672c\u673a\u6307\u5b9a\u7684\u7aef\u53e3（\u901a\u5e38\u7528\u4e8e\u670d\u52a1\u7aef）<\/p>\n

\u00b7 DatagramSocket\u7c7b\u4e0b\u7684\u65b9\u6cd5：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0void receive(DatagramPacket p)：\u4ece\u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u62a5，\u5982\u679c\u6ca1\u6709\u63a5\u6536\u5230\u6570\u636e\u62a5\u5c31\u4f1a\u963b\u585e\u7b49\u5f85<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0void send(DatagramPacket p)：\u4ece\u5957\u63a5\u5b57\u53d1\u9001\u6570\u636e\u62a5，\u4e0d\u4f1a\u963b\u585e\u7b49\u5f85，\u76f4\u63a5\u53d1\u9001<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0void close()：\u5173\u95ed\u6b64\u6570\u636e\u62a5\u5957\u63a5\u5b57<\/p>\n

\u00a0\u00b7 DatagramPacket：\u662f UDP Socket \u53d1\u9001\/\u63a5\u6536\u7684\u6570\u636e\u62a5，\u5176\u6784\u9020\u65b9\u6cd5\u5305\u62ec：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0DatagramPacket(byte[] buf, int length)：\u6784\u9020\u2f00\u4e2aDatagramPacket\u4ee5\u2f64\u6765\u63a5\u6536\u6570\u636e\u62a5，\u63a5\u6536\u7684\u6570\u636e\u4fdd\u5b58\u5728\u5b57\u8282\u6570\u7ec4（\u7b2c\u2f00\u4e2a\u53c2\u6570buf）\u4e2d，\u63a5\u6536\u6307\u5b9a\u957f\u5ea6（\u7b2c\u2f06\u4e2a\u53c2\u6570length）<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0DatagramPacket(byte[] buf, int offset, int length, SocketAddress address)：\u6784\u9020\u2f00\u4e2aDatagramPacket\u4ee5\u2f64\u6765\u53d1\u9001\u6570\u636e\u62a5，\u53d1\u9001\u7684\u6570\u636e\u4e3a\u5b57\u8282\u6570\u7ec4（\u7b2c\u2f00\u4e2a\u53c2\u6570buf）\u4e2d，\u4ece0\u5230\u6307\u5b9a\u957f\u5ea6（\u7b2c\u2f06\u4e2a\u53c2\u6570length）\u3002address\u6307\u5b9a\u2f6c\u7684\u4e3b\u673a\u7684 IP \u548c\u7aef\u53e3\u53f7\u3002<\/p>\n

\u00b7 DatagramPacket\u7c7b\u4e0b\u7684\u65b9\u6cd5：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0InetAddress getAddress()：\u4ece\u63a5\u6536\u7684\u6570\u636e\u62a5\u4e2d，\u83b7\u53d6\u53d1\u9001\u7aef\u4e3b\u673a IP \u5730\u5740；\u6216\u4ece\u53d1\u9001\u7684\u6570\u636e\u62a5\u4e2d，\u83b7\u53d6\u63a5\u6536\u7aef\u4e3b\u673a IP \u5730\u5740<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int getPort()：\u4ece\u63a5\u6536\u7684\u6570\u636e\u62a5\u4e2d，\u83b7\u53d6\u53d1\u9001\u7aef\u4e3b\u673a\u7684\u7aef\u53e3\u53f7；\u6216\u4ece\u53d1\u9001\u7684\u6570\u636e\u62a5\u4e2d，\u83b7\u53d6\u63a5\u6536\u7aef\u4e3b\u673a\u7aef\u53e3\u53f7<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0byte[] getData()：\u83b7\u53d6\u6570\u636e\u62a5\u4e2d\u7684\u6570\u636e<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u56de\u663e\u670d\u52a1\u5668\u9700\u8981\u5b9e\u73b0\u4e24\u4e2a\u7a0b\u5e8f：UDP \u670d\u52a1\u5668\u548c UDP \u5ba2\u6237\u7aef，\u4e3b\u52a8\u53d1\u8d77\u901a\u4fe1\u7684\u4e00\u65b9\u79f0\u4e3a\u5ba2\u6237\u7aef，\u88ab\u52a8\u63a5\u6536\u7684\u4e00\u65b9\u7684\u662f\u670d\u52a1\u5668\u3002<\/p>\n

UDP \u670d\u52a1\u5668<\/h3>\n

package network;<\/p>\n

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

\/**
\n * Created with IntelliJ IDEA.
\n * Description: \u56de\u663e\u670d\u52a1\u5668
\n * \u5ba2\u6237\u7aef\u53d1\u5565\u6837\u7684\u8bf7\u6c42，\u670d\u52a1\u5668\u5c31\u8fd4\u56de\u5565\u6837\u7684\u54cd\u5e94
\n * User: Li_yizYa
\n * Date: 2025\/5\/13
\n * Time: 15:29
\n *\/
\npublic class UdpEchoServer {
\n private DatagramSocket socket = null;<\/p>\n

public UdpEchoServer(int port) throws SocketException {
\n socket = new DatagramSocket(port);
\n }<\/p>\n

\/**
\n * \u901a\u8fc7 start \u542f\u52a8\u670d\u52a1\u5668\u7684\u6838\u5fc3\u6d41\u7a0b
\n *\/
\n public void start() throws IOException {
\n System.out.println("\u670d\u52a1\u5668\u542f\u52a8!");
\n while (true) {
\n \/\/ \u6b64\u5904\u901a\u8fc7 \u201c\u6b7b\u5faa\u73af\u201d \u4e0d\u505c\u7684\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42.<\/p>\n

\/\/ 1. \u8bfb\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5e76\u89e3\u6790
\n DatagramPacket requestPacket = new DatagramPacket(new byte[4096], 4096);
\n socket.receive(requestPacket);
\n \/\/ \u4e0a\u8ff0\u6536\u5230\u7684\u6570\u636e，\u662f\u4e8c\u8fdb\u5236 byte[] \u7684\u5f62\u5f0f\u4f53\u73b0\u7684，\u540e\u7eed\u4ee3\u7801\u5982\u679c\u8981\u8fdb\u884c\u6253\u5370\u4e4b\u7c7b\u7684\u5904\u7406\u64cd\u4f5c
\n \/\/ \u9700\u8981\u8f6c\u6210\u5b57\u7b26\u4e32\u624d\u597d\u5904\u7406
\n String request = new String(requestPacket.getData(), 0, requestPacket.getLength());<\/p>\n

\/\/ 2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94，\u7531\u4e8e\u6b64\u5904\u662f\u56de\u663e\u670d\u52a1\u5668，\u54cd\u5e94\u5c31\u662f\u8bf7\u6c42
\n String response = process(request);<\/p>\n

\/\/ 3. \u628a\u54cd\u5e94\u5199\u56de\u5230\u5ba2\u6237\u7aef
\n DatagramPacket responsePacket = new DatagramPacket(response.getBytes(), response.getBytes().length,
\n requestPacket.getSocketAddress());
\n socket.send(responsePacket);<\/p>\n

\/\/ 4. \u6253\u5370\u65e5\u5fd7
\n System.out.printf("[%s:%d] req=%s, resp=%s\\\\n", requestPacket.getAddress(), requestPacket.getPort(),
\n request, response);
\n }
\n }<\/p>\n

public String process(String request) {
\n return request;
\n }<\/p>\n

public static void main(String[] args) throws IOException {
\n UdpEchoServer server = new UdpEchoServer(9090);
\n server.start();<\/p>\n

}
\n}<\/p>\n

UDP \u5ba2\u6237\u7aef<\/h3>\n

package network;<\/p>\n

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

\/**
\n * Created with IntelliJ IDEA.
\n * Description:
\n * User: Li_yizYa
\n * Date: 2025\/5\/13
\n * Time: 15:29
\n *\/
\npublic class UdpEchoClient {
\n DatagramSocket socket = null;
\n private String serverIP;
\n private int serverPort;<\/p>\n

public UdpEchoClient(String serverIP, int serverPort) throws IOException {
\n socket = new DatagramSocket();
\n this.serverIP = serverIP;
\n this.serverPort = serverPort;
\n }<\/p>\n

public void start() throws IOException {
\n System.out.println("\u542f\u52a8\u5ba2\u6237\u7aef");
\n Scanner scanner = new Scanner(System.in);<\/p>\n

while (true) {
\n \/\/ 1. \u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u5230\u7528\u6237\u7684\u8f93\u5165
\n System.out.print("-> ");
\n String request = scanner.next();
\n \/\/ 2. \u6784\u9020\u4e00\u4e2a UDP \u8bf7\u6c42，\u53d1\u9001\u7ed9\u670d\u52a1\u5668
\n DatagramPacket requestPacket = new DatagramPacket(request.getBytes(), request.getBytes().length,
\n InetAddress.getByName(this.serverIP), this.serverPort);
\n socket.send(requestPacket);
\n \/\/ 3. \u4ece\u670d\u52a1\u5668\u8bfb\u53d6\u5230\u54cd\u5e94
\n DatagramPacket responsePacket = new DatagramPacket(new byte[4096], 4096);
\n socket.receive(responsePacket);
\n String response = new String(responsePacket.getData(), 0, responsePacket.getLength());
\n \/\/ 4. \u628a\u54cd\u5e94\u6253\u5370\u5230\u63a7\u5236\u53f0\u4e0a
\n System.out.println(response);
\n }
\n }<\/p>\n

public static void main(String[] args) throws IOException {
\n \/\/ 127.0.0.1 \u7279\u6b8a IP，\u73af\u56de IP
\n \/\/ \u5982\u679c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u5728\u540c\u4e00\u4e2a\u4e3b\u673a\u4e0a，\u5c31\u4f7f\u7528\u8fd9\u4e2a IP
\n UdpEchoClient client = new UdpEchoClient("127.0.0.1", 9090);
\n client.start();
\n }
\n}<\/p>\n

\u57fa\u4e8e TCP \u534f\u8bae\u5b9e\u73b0\u56de\u663e\u670d\u52a1\u5668<\/h2>\n

TCP Socket \u7f16\u7a0b\u5e38\u7528 Api<\/h3>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728TCP Socket\u7f16\u7a0b\u4e2d，\u6838\u5fc3\u7c7b\u662f ServerSocket（\u4e13\u95e8\u7ed9\u670d\u52a1\u5668\u4f7f\u7528\u7684 Socket \u5bf9\u8c61）\u548c Socket（\u65e2\u4f1a\u7ed9\u5ba2\u6237\u7aef\u4f7f\u7528，\u53c8\u4f1a\u7ed9\u670d\u52a1\u5668\u4f7f\u7528）\u3002\u7531\u4e8e TCP \u534f\u8bae\u662f\u9762\u5411\u5b57\u8282\u6d41\u7684，\u5176\u6570\u636e\u7684\u57fa\u672c\u4f20\u8f93\u5355\u4f4d\u5c31\u662f byte，\u56e0\u6b64\u4e0d\u9700\u8981\u50cf UDP \u534f\u8bae\u90a3\u6837\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u6765\u8868\u793a \u201c\u6570\u636e\u62a5\u201d \u5bf9\u8c61\u3002<\/p>\n

\u00b7 ServerSocket：\u662f\u521b\u5efa TCP \u670d\u52a1\u5668 Socket \u7684 Api，\u5176\u6784\u9020\u65b9\u6cd5\u4e3a：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ServerSocket(int port)：\u521b\u5efa\u2f00\u4e2a\u670d\u52a1\u7aef\u6d41\u5957\u63a5\u5b57Socket，\u5e76\u7ed1\u5b9a\u5230\u6307\u5b9a\u7aef\u53e3<\/p>\n

\u00b7\u00a0ServerSocket \u7c7b\u4e0b\u5e38\u7528\u7684\u65b9\u6cd5：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Socket accept()：\u5f00\u59cb\u76d1\u542c\u6307\u5b9a\u7aef\u53e3（\u521b\u5efa\u65f6\u7ed1\u5b9a\u7684\u7aef\u53e3），\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u540e，\u8fd4\u56de\u2f00\u4e2a\u670d\u52a1\u7aef Socket \u5bf9\u8c61，\u5e76\u57fa\u4e8e\u8be5 Socket \u5efa\u7acb\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5，\u5426\u5219\u963b\u585e\u7b49\u5f85<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0void close()：\u5173\u95ed\u6b64\u5957\u63a5\u5b57<\/p>\n

\u00a0\u00b7 Socket：\u5176\u662f\u5ba2\u6237\u7aef Socket，\u6216\u670d\u52a1\u7aef\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5（accept\u65b9\u6cd5）\u7684\u8bf7\u6c42\u540e，\u8fd4\u56de\u7684\u670d\u52a1\u7aef Socket\u3002\u4e0d\u7ba1\u662f\u5ba2\u6237\u7aef\u8fd8\u662f\u670d\u52a1\u7aef Socket，\u90fd\u662f\u53cc\u65b9\u5efa\u7acb\u8fde\u63a5\u4ee5\u540e，\u4fdd\u5b58\u7684\u5bf9\u7aef\u4fe1\u606f，\u53ca\u65f6\u7528\u6765\u4e0e\u5bf9\u65b9\u6536\u53d1\u6570\u636e\u7684\u3002\u5176\u6784\u9020\u65b9\u6cd5\u4e3a：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Socket(String host, int port)：\u521b\u5efa\u2f00\u4e2a\u5ba2\u6237\u7aef\u6d41\u5957\u63a5\u5b57 Socket，\u5e76\u4e0e\u5bf9\u5e94 IP \u7684\u4e3b\u673a \u4e0a，\u5bf9\u5e94\u7aef\u53e3\u7684\u8fdb\u7a0b\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n

\u00b7 Socket \u7c7b\u4e0b\u7684\u65b9\u6cd5：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0InetAddress getInetAddress()：\u8fd4\u56de\u5957\u63a5\u5b57\u6240\u5728\u7684\u5730\u5740<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0InputStream getInputStream()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u5165\u6d41<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OutputStream getOutputStream()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u51fa\u6d41<\/p>\n

TCP \u670d\u52a1\u5668<\/h3>\n

package network;<\/p>\n

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

\/**
\n * Created with IntelliJ IDEA.
\n * Description: TCP\u56de\u663e\u670d\u52a1\u5668
\n * \u5ba2\u6237\u7aef\u53d1\u5565\u6837\u7684\u8bf7\u6c42，\u670d\u52a1\u5668\u5c31\u8fd4\u56de\u5565\u6837\u7684\u54cd\u5e94
\n * User: Li_yizYa
\n * Date: 2025\/5\/21
\n * Time: 20:19
\n *\/
\npublic class TcpEchoServer {
\n private ServerSocket serverSocket = null;<\/p>\n

public TcpEchoServer(int port) throws IOException {
\n serverSocket = new ServerSocket(port);
\n }<\/p>\n

public void start() throws IOException {
\n System.out.println("\u542f\u52a8\u670d\u52a1\u5668");
\n while (true) {
\n Socket clientSocket = serverSocket.accept();
\n Thread t = new Thread(() -> {
\n try {
\n processConnection(clientSocket);
\n } catch (IOException e) {
\n throw new RuntimeException(e);
\n }
\n });
\n t.start();
\n }
\n }<\/p>\n

\/\/ \u9488\u5bf9\u4e00\u4e2a\u8fde\u63a5，\u63d0\u4f9b\u5904\u7406\u903b\u8f91
\n private void processConnection(Socket clientSocket) throws IOException {
\n \/\/ \u5148\u6253\u5370\u4e00\u4e0b\u5ba2\u6237\u7aef\u4fe1\u606f
\n System.out.printf("[%s:%d] \u5ba2\u6237\u7aef\u4e0a\u7ebf!\\\\n", clientSocket.getInetAddress(), clientSocket.getPort());
\n \/\/ TCP \u662f\u5168\u53cc\u5de5\u7684\u901a\u4fe1，\u4e00\u4e2a socket \u5bf9\u8c61，\u65e2\u53ef\u4ee5\u8bfb，\u4e5f\u53ef\u4ee5\u5199
\n \/\/ \u83b7\u53d6\u5230 socket \u4e2d\u6301\u6709\u7684\u6d41\u5bf9\u8c61
\n try (InputStream inputStream = clientSocket.getInputStream();
\n OutputStream outputStream = clientSocket.getOutputStream()) {
\n \/\/ \u4f7f\u7528 Scanner \u5305\u88c5\u4e00\u4e0b inputStream，\u5c31\u53ef\u4ee5\u66f4\u65b9\u4fbf\u7684\u8bfb\u53d6\u8fd9\u91cc\u7684\u8bf7\u6c42\u6570\u636e\u4e86
\n while (true) {
\n \/\/ 1. \u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790
\n Scanner scanner = new Scanner(inputStream);
\n PrintWriter printWriter = new PrintWriter(outputStream);
\n if (!scanner.hasNext()) {
\n \/\/ \u5982\u679c scanner \u65e0\u6cd5\u8bfb\u53d6\u51fa\u6570\u636e，\u8bf4\u660e\u5ba2\u6237\u7aef\u5173\u95ed\u4e86\u8fde\u63a5，\u5bfc\u81f4\u670d\u52a1\u5668\u8fd9\u8fb9\u8bfb\u53d6\u5230 \u201c\u672b\u5c3e\u201d
\n break;
\n }
\n String request = scanner.next();
\n \/\/ 2. \u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94
\n String response = process(request);
\n \/\/ 3. \u628a\u54cd\u5e94\u5199\u56de\u7ed9\u5ba2\u6237\u7aef
\n \/\/ \u6b64\u5904\u53ef\u4ee5\u6309\u7167\u5b57\u8282\u6570\u7ec4\u6765\u5199，\u4e5f\u53ef\u4ee5\u53f3\u53e6\u5916\u4e00\u79cd\u5199\u6cd5
\n \/\/ outputStream.write(response.getBytes());
\n printWriter.println(response);
\n printWriter.flush();<\/p>\n

\/\/ \u6253\u5370\u65e5\u5fd7
\n System.out.printf("[%s:%d] req=%s; resp=%s\\\\n", clientSocket.getInetAddress(),
\n clientSocket.getPort(), request, response);
\n }<\/p>\n

} catch (IOException e) {
\n e.printStackTrace();
\n } finally {
\n System.out.printf("[%s:%d] \u5ba2\u6237\u7aef\u4e0b\u7ebf!\\\\n", clientSocket.getInetAddress(), clientSocket.getPort());
\n clientSocket.close();
\n }<\/p>\n

}<\/p>\n

private String process(String request) {
\n return request;
\n }<\/p>\n

public static void main(String[] args) throws IOException {
\n TcpEchoServer server = new TcpEchoServer(9090);
\n server.start();
\n }
\n}<\/p>\n

TCP \u5ba2\u6237\u7aef\u00a0<\/h3>\n

package network;<\/p>\n

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

\/**
\n * Created with IntelliJ IDEA.
\n * Description:
\n * User: Li_yizYa
\n * Date: 2025\/5\/21
\n * Time: 20:20
\n *\/
\npublic class TcpEchoClient {
\n private Socket socket = null;<\/p>\n

\/**
\n * \u6784\u9020\u65b9\u6cd5
\n * @param serverIp \u670d\u52a1\u5668 Ip
\n * @param serverPort \u670d\u52a1\u5668\u7aef\u53e3\u53f7
\n *\/
\n public TcpEchoClient(String serverIp, int serverPort) throws IOException {
\n socket = new Socket(serverIp, serverPort);
\n }<\/p>\n

public void start() {
\n System.out.println("\u5ba2\u6237\u7aef\u542f\u52a8");<\/p>\n

try (InputStream inputStream = socket.getInputStream();
\n OutputStream outputStream = socket.getOutputStream()) {
\n Scanner scanner = new Scanner(inputStream);
\n Scanner scannerIn = new Scanner(System.in);
\n PrintWriter printWriter = new PrintWriter(outputStream);
\n while (true) {
\n \/\/ 1. \u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u6570\u636e
\n System.out.print("-> ");
\n String request = scannerIn.next();
\n \/\/ 2. \u628a\u8bf7\u6c42\u53d1\u7ed9\u670d\u52a1\u5668
\n printWriter.println(request);
\n \/\/ \u5f15\u5165 flush(\u51b2\u5237) \u64cd\u4f5c，\u4e3b\u52a8\u5237\u65b0\u7f13\u51b2\u533a
\n printWriter.flush();
\n \/\/ 3. \u4ece\u670d\u52a1\u5668\u8bfb\u53d6\u54cd\u5e94
\n if (!scanner.hasNext()) {
\n break;
\n }<\/p>\n

String response = scanner.next();
\n \/\/ 4. \u6253\u5370\u54cd\u5e94\u7ed3\u679c
\n System.out.println(response);
\n }
\n } catch (Exception e) {
\n e.printStackTrace();
\n }
\n }<\/p>\n

public static void main(String[] args) throws IOException {
\n TcpEchoClient client = new TcpEchoClient("127.0.0.1", 9090);
\n client.start();
\n }
\n} <\/p>\n

TCP \u670d\u52a1\u7aef\u5e38\u89c1\u7684\u00a0bug\u00a0<\/h3>\n

\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u540e，\u6ca1\u6709\u54cd\u5e94<\/h4>\n

\u00a0\u5728\u5ba2\u6237\u7aef\u4e2d，\u6211\u4eec\u901a\u8fc7\u4e0b\u9762\u7684\u65b9\u5f0f\u7ed9\u670d\u52a1\u7aef\u53d1\u9001\u8bf7\u6c42：<\/p>\n

\/\/ 2. \u628a\u8bf7\u6c42\u53d1\u7ed9\u670d\u52a1\u5668
\nprintWriter.println(request); <\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e4b\u6240\u4ee5\u8fd9\u91cc\u6ca1\u6709\u54cd\u5e94，\u662f\u56e0\u4e3a\u5176\u5b9e\u5ba2\u6237\u7aef\u7684\u6570\u636e\u5e76\u6ca1\u6709\u53d1\u9001\u51fa\u53bb，\u56e0\u4e3a PrintWriter \u8fd9\u4e2a\u7c7b\u4ee5\u53ca IO \u6d41\u4e2d\u7684\u5f88\u591a\u7c7b，\u90fd\u662f\u81ea\u5e26\u7f13\u51b2\u533a\u7684，\u5f15\u5165\u7f13\u51b2\u533a\u4e4b\u540e，\u8fdb\u884c \u5199\u5165\u6570\u636e\u64cd\u4f5c \u65f6，\u4e0d\u4f1a\u7acb\u5373\u89e6\u53d1 IO，\u800c\u662f\u5148\u5c06\u5176\u653e\u5728\u5185\u5b58\u7f13\u51b2\u533a\u4e2d，\u7b49\u7f13\u51b2\u533a\u6570\u636e\u5230\u8fbe\u4e00\u5b9a\u6570\u91cf\u540e，\u624d\u4f1a\u7edf\u4e00\u53d1\u9001\u3002\u800c\u4e0a\u8ff0\u7684\u95ee\u9898，\u5176\u5b9e\u5c31\u662f\u56e0\u4e3a\u6570\u636e\u6bd4\u8f83\u5c11，\u5e76\u672a\u89e6\u53d1\u53d1\u9001\u64cd\u4f5c\u3002\u56e0\u6b64，\u6211\u4eec\u901a\u8fc7\u5f15\u5165 flush \u64cd\u4f5c\u5c31\u53ef\u4ee5\u89e3\u51b3\u8be5\u95ee\u9898：<\/p>\n

\/\/ \u5f15\u5165 flush(\u51b2\u5237) \u64cd\u4f5c，\u4e3b\u52a8\u5237\u65b0\u7f13\u51b2\u533a
\nprintWriter.flush(); <\/p>\n

\u670d\u52a1\u5668\u4ec5\u652f\u6301\u4e0e\u4e00\u4e2a\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u00a0<\/h4>\n

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