{"id":12251,"date":"2025-04-18T19:23:44","date_gmt":"2025-04-18T11:23:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/12251.html"},"modified":"2025-04-18T19:23:44","modified_gmt":"2025-04-18T11:23:44","slug":"%e6%9e%84%e5%bb%ba%e4%b8%80%e4%b8%aa%e6%9c%80%e7%ae%80%e5%8d%95%e7%9a%84udp%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%92%8c%e5%ae%a2%e6%88%b7%e7%ab%af%e5%b9%b6%e9%80%90%e8%a1%8c%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/12251.html","title":{"rendered":"\u6784\u5efa\u4e00\u4e2a\u6700\u7b80\u5355\u7684UDP\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u5e76\u9010\u884c\u89e3\u6790"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"1.%E6%9C%8D%E5%8A%A1%E5%99%A8-toc\" style=\"margin-left:0px\">1.\u670d\u52a1\u5668<\/p>\n<p id=\"%EF%BC%881%EF%BC%89%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5-toc\" style=\"margin-left:40px\">&#xff08;1&#xff09;\u57fa\u672c\u6982\u5ff5<\/p>\n<p id=\"%EF%BC%882%EF%BC%89%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0-toc\" style=\"margin-left:40px\">&#xff08;2&#xff09;\u4ee3\u7801\u5b9e\u73b0<\/p>\n<p id=\"%C2%A03.%E9%80%90%E8%A1%8C%E8%A7%A3%E6%9E%90-toc\" style=\"margin-left:40px\">\u00a03.\u9010\u884c\u89e3\u6790<\/p>\n<p id=\"1%EF%BC%89-toc\" style=\"margin-left:40px\">1&#xff09;<\/p>\n<p id=\"2%EF%BC%89-toc\" style=\"margin-left:40px\">2&#xff09;<\/p>\n<p id=\"3%EF%BC%89-toc\" style=\"margin-left:40px\">3&#xff09;<\/p>\n<p id=\"4%EF%BC%89-toc\" style=\"margin-left:40px\">4&#xff09;<\/p>\n<p id=\"5%EF%BC%89-toc\" style=\"margin-left:40px\">5&#xff09;<\/p>\n<p id=\"6%EF%BC%89-toc\" style=\"margin-left:40px\">6&#xff09;<\/p>\n<p id=\"7%EF%BC%89-toc\" style=\"margin-left:40px\">7&#xff09;<\/p>\n<p id=\"8%EF%BC%89-toc\" style=\"margin-left:40px\">8&#xff09;<\/p>\n<p id=\"1.%C2%A0response.getBytes()%3A-toc\" style=\"margin-left:80px\">1.\u00a0response.getBytes():<\/p>\n<p id=\"2.response.getBytes().length%3A%C2%A0-toc\" style=\"margin-left:80px\">2.response.getBytes().length:\u00a0<\/p>\n<p id=\"3.requestPacket.getSocketAddress()%3A%C2%A0-toc\" style=\"margin-left:80px\">3.requestPacket.getSocketAddress():\u00a0<\/p>\n<p id=\"4.DatagramPacket%20responsePacket%20%3D%20new%20DatagramPacket%C2%A0-toc\" style=\"margin-left:80px\">4.DatagramPacket responsePacket &#061; new DatagramPacket\u00a0<\/p>\n<p id=\"9%EF%BC%89-toc\" style=\"margin-left:40px\">9&#xff09;<\/p>\n<p id=\"10%EF%BC%89-toc\" style=\"margin-left:40px\">10&#xff09;<\/p>\n<p id=\"11%EF%BC%89-toc\" style=\"margin-left:40px\">11&#xff09;<\/p>\n<p id=\"2.%E5%AE%A2%E6%88%B7%E7%AB%AF-toc\" style=\"margin-left:0px\">2.\u5ba2\u6237\u7aef<\/p>\n<p id=\"%EF%BC%881%EF%BC%89%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5-toc\" style=\"margin-left:40px\">&#xff08;1&#xff09;\u57fa\u672c\u6982\u5ff5<\/p>\n<p id=\"%EF%BC%882%EF%BC%89%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0-toc\" style=\"margin-left:40px\">&#xff08;2&#xff09;\u4ee3\u7801\u5b9e\u73b0<\/p>\n<p id=\"%EF%BC%883%EF%BC%89%E9%80%90%E8%A1%8C%E8%A7%A3%E6%9E%90-toc\" style=\"margin-left:40px\">&#xff08;3&#xff09;\u9010\u884c\u89e3\u6790<\/p>\n<p id=\"1%EF%BC%89-toc\" style=\"margin-left:80px\">1&#xff09;<\/p>\n<p id=\"2%EF%BC%89-toc\" style=\"margin-left:80px\">2&#xff09;<\/p>\n<p id=\"3%EF%BC%89-toc\" style=\"margin-left:80px\">3&#xff09;<\/p>\n<p id=\"4%EF%BC%89-toc\" style=\"margin-left:80px\">4&#xff09;<\/p>\n<p id=\"5%EF%BC%89-toc\" style=\"margin-left:80px\">5&#xff09;<\/p>\n<p id=\"6%EF%BC%89-toc\" style=\"margin-left:80px\">6&#xff09;<\/p>\n<p id=\"7%EF%BC%89-toc\" style=\"margin-left:80px\">7&#xff09;<\/p>\n<p id=\"8%EF%BC%89-toc\" style=\"margin-left:80px\">8&#xff09;<\/p>\n<p id=\"9%EF%BC%89-toc\" style=\"margin-left:80px\">9&#xff09;<\/p>\n<p id=\"10%EF%BC%89-toc\" style=\"margin-left:80px\">10&#xff09;<\/p>\n<p id=\"3.%E7%BB%93%E6%9E%9C%E5%B1%95%E7%A4%BA-toc\" style=\"margin-left:0px\">3.\u7ed3\u679c\u5c55\u793a<\/p>\n<hr id=\"hr-toc\" \/>\n<p>\u5728 Java \u7f51\u7edc\u7f16\u7a0b\u4e2d&#xff0c;\u5ba2\u6237\u7aef&#xff08;Client&#xff09;\u548c\u670d\u52a1\u5668&#xff08;Server&#xff09;\u662f\u4e24\u4e2a\u6838\u5fc3\u89d2\u8272&#xff0c;\u5b83\u4eec\u5171\u540c\u6784\u6210\u4e86\u7f51\u7edc\u901a\u4fe1\u7684\u57fa\u672c\u6a21\u578b&#xff08;\u5373\u00a0C\/S \u67b6\u6784&#xff09;\u3002<\/p>\n<p>\u4ee5\u4e0b\u6211\u4f1a\u9010\u884c\u89e3\u6790\u6784\u5efa\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u670d\u52a1\u5668\u548c\u5ba2\u6237\u7aef\u7684\u4ee3\u7801\u3002<\/p>\n<h2 id=\"1.%E6%9C%8D%E5%8A%A1%E5%99%A8\">1.\u670d\u52a1\u5668<\/h2>\n<h3 id=\"%EF%BC%881%EF%BC%89%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5\">&#xff08;1&#xff09;\u57fa\u672c\u6982\u5ff5<\/h3>\n<p>\u670d\u52a1\u5668\u662f\u00a0\u63a5\u6536\u8bf7\u6c42\u00a0\u7684\u4e00\u65b9&#xff0c;\u88ab\u52a8\u76d1\u542c\u7279\u5b9a\u7aef\u53e3&#xff0c;\u5904\u7406\u5ba2\u6237\u7aef\u8bf7\u6c42\u5e76\u8fd4\u56de\u54cd\u5e94\u3002 \u5178\u578b\u573a\u666f&#xff1a;Web \u670d\u52a1\u5668&#xff08;\u5982 Tomcat&#xff09;\u3001\u6570\u636e\u5e93\u670d\u52a1\u5668\u3001\u6e38\u620f\u670d\u52a1\u5668\u7b49\u3002<\/p>\n<h3 id=\"%EF%BC%882%EF%BC%89%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0\">&#xff08;2&#xff09;\u4ee3\u7801\u5b9e\u73b0<\/h3>\n<p>public class UdpEchServer {<br \/>\n        private DatagramSocket socket&#061;null;<br \/>\n        public UdpEchServer(int port) throws SocketException {<br \/>\n            socket&#061;new DatagramSocket(port);<br \/>\n        }<br \/>\n        public void start() throws IOException {<br \/>\n            System.out.println(&#034;\u670d\u52a1\u5668\u542f\u52a8&#034;);<br \/>\n            while(true){<br \/>\n            \/*<br \/>\n            1.\u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790<br \/>\n             *\/<br \/>\n                DatagramPacket requestPacket&#061;new DatagramPacket(new byte[4096],4096);<br \/>\n                socket.receive(requestPacket);<br \/>\n                String request&#061;new String(requestPacket.getData(),0,requestPacket.getLength());\/\/\u6570\u7ec4\u4e2d\u6709\u6548\u7684\u957f\u5ea6,\u907f\u514d\u53ea\u6536\u5230\u5f88\u5c11\u7684\u6570\u636e\u5374\u6784\u5efa\u4e86\u5f88\u5927\u7684byte\u6570\u7ec4<br \/>\n                \/\/2.\u6839\u636e\u8bf7\u6c42,\u8ba1\u7b97\u76f8\u5e94(\u4e00\u4e2a\u670d\u52a1\u5668\u6700\u5173\u952e\u7684\u903b\u8f91)<br \/>\n                String response&#061;process(request);<\/p>\n<p>            \/*3.\u5c06\u54cd\u5e94\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef*\/<br \/>\n                DatagramPacket responsePacket &#061; new DatagramPacket(response.getBytes(),response.getBytes().length,requestPacket.getSocketAddress());<br \/>\n                socket.send(responsePacket);<br \/>\n                \/\/4.\u6253\u5370\u4e00\u4e2a\u65e5\u5fd7<br \/>\n                System.out.printf(<br \/>\n                        &#034;[%s:%d] request:%s, response:%s\\\\n&#034;,<br \/>\n                        requestPacket.getAddress().toString(), \/\/ \u5ba2\u6237\u7aefIP\u5730\u5740<br \/>\n                        requestPacket.getPort(),               \/\/ \u5ba2\u6237\u7aef\u7aef\u53e3\u53f7<br \/>\n                        request,                               \/\/ \u8bf7\u6c42\u5185\u5bb9<br \/>\n                        response                               \/\/ \u54cd\u5e94\u5185\u5bb9<br \/>\n                );<br \/>\n            }<br \/>\n        }<br \/>\n        \/*\u628a\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94\u7684\u903b\u8f91\u6784\u5efa\u6210\u4e86\u4e00\u4e2a\u65b9\u6cd5   *\/<br \/>\n        private String process(String request) {<br \/>\n            return request;<br \/>\n        }<br \/>\n public static void main(String[] args) throws IOException {<br \/>\n        UdpEchoClient client &#061; new UdpEchoClient(&#034;127.0.0.1&#034;, 9090);<br \/>\n        client.start();<br \/>\n    }<br \/>\n    } <\/p>\n<h3 id=\"%C2%A03.%E9%80%90%E8%A1%8C%E8%A7%A3%E6%9E%90\">\u00a03.\u9010\u884c\u89e3\u6790<\/h3>\n<h3 id=\"1%EF%BC%89\">1&#xff09;<\/h3>\n<p>   private DatagramSocket socket&#061;null; <\/p>\n<p>DatagramSock\u662fUDP socket &#xff0c;\u7528\u4e8e\u53d1\u9001\u548c\u63a5\u53d7\u6570\u636e\u5305\u3002<\/p>\n<h3 id=\"2%EF%BC%89\">2&#xff09;<\/h3>\n<p> public UdpEchServer(int port) throws SocketException {<br \/>\n            socket&#061;new DatagramSocket(port);<br \/>\n        } <\/p>\n<p>\u6307\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7&#xff08;int port&#xff09;\u7ed9\u670d\u52a1\u5668\u4f7f\u7528\u3002\u56e0\u4e3a\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\u4e0d\u80fd\u4e00\u76f4\u53d8&#xff0c;\u6240\u4ee5\u76f4\u63a5\u6307\u5b9a\u56fa\u5b9a\u7aef\u53e3\u53f7\u3002<\/p>\n<h3 id=\"3%EF%BC%89\">3&#xff09;<\/h3>\n<p>while(true) <\/p>\n<p>\u56e0\u4e3a\u670d\u52a1\u5668\u901a\u5e38\u662f7*24\u5c0f\u65f6\u4e0d\u95f4\u65ad\u7684\u8bfb\u53d6\u8bf7\u6c42\u7684&#xff0c;\u6240\u4ee5\u901a\u5e38\u4f1a\u7528\u4e00\u4e2awhile&#xff08;true&#xff09;\u8fd9\u6837\u7684\u6b7b\u5faa\u73af\u6765\u4fdd\u8bc1\u670d\u52a1\u5668\u6301\u7eed\u5de5\u4f5c\u3002\u5faa\u73af\u4e00\u6b21&#xff0c;\u5c31\u76f8\u5f53\u4e8e\u8bfb\u53d6\u4e00\u6b21\u8bf7\u6c42\u3002<\/p>\n<h3 id=\"4%EF%BC%89\">4&#xff09;<\/h3>\n<p> DatagramPacket requestPacket&#061;new DatagramPacket(new byte[4096],4096); <\/p>\n<p>\u6784\u5efa\u51fa\u4e00\u4e2a\u7528\u4e8e\u63a5\u53d7\u8bf7\u6c42\u6570\u636e\u62a5\u7684DatagramPacket\u3002<\/p>\n<p>\u8fd9\u91cc\u4f7f\u7528\u6784\u9020\u51fd\u6570\u00a0DatagramPacket(byte[] buf, int length)\u00a0\u521b\u5efa\u4e86\u4e00\u4e2a\u00a0DatagramPacket\u00a0\u5bf9\u8c61&#xff0c;\u5176\u4e2d&#xff1a;<\/p>\n<ul>\n<li>byte[] buf\u00a0\u662f\u7528\u4e8e\u5b58\u50a8\u63a5\u6536\u5230\u7684\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002<\/li>\n<li>int length\u00a0\u662f\u7f13\u51b2\u533a\u7684\u957f\u5ea6&#xff0c;\u8868\u793a\u53ef\u4ee5\u63a5\u6536\u7684\u6700\u5927\u6570\u636e\u91cf\u3002<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"399\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418112341-6802363d183e0.png\" width=\"1116\" \/><\/p>\n<h3 id=\"5%EF%BC%89\">5&#xff09;<\/h3>\n<p> socket.receive(requestPacket); <\/p>\n<p>\u00a0\u8fd9\u91cc\u5c06requestPacket\u4f5c\u4e3a\u8f93\u51fa\u578b\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>\u8fd9\u4e00\u884c\u4ee3\u7801\u662f\u4f7f\u7528UDP\u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u62a5\u7684\u65b9\u6cd5\u8c03\u7528\u3002receive\u65b9\u6cd5\u4f1a\u963b\u585e\u670d\u52a1\u5668\u8fdb\u7a0b&#xff0c;\u76f4\u5230\u63a5\u6536\u5230\u4e00\u4e2a\u6570\u636e\u62a5\u3002<\/li>\n<li>\u4e00\u65e6\u63a5\u6536\u5230\u6570\u636e\u62a5&#xff0c;requestPacket\u5c06\u88ab\u586b\u5145\u63a5\u6536\u5230\u7684\u6570\u636e\u3001\u53d1\u9001\u65b9\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u3002<\/li>\n<\/ul>\n<h3 id=\"6%EF%BC%89\">6&#xff09;<\/h3>\n<p> String request&#061;new String(requestPacket.getData(),0,requestPacket.getLength()); <\/p>\n<p>\u5c06\u8bfb\u53d6\u5230\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u8f6c\u6362\u6210\u5b57\u7b26\u4e32&#xff1a;<\/p>\n<li>\n<p>requestPacket.getData(): \u8fd9\u4e2a\u65b9\u6cd5\u8c03\u7528\u8fd4\u56de\u7684\u662f\u63a5\u6536\u5230\u7684\u6570\u636e\u5305\u4e2d\u5305\u542b\u7684\u5b57\u8282\u6570\u7ec4\u3002\u8fd9\u4e2a\u6570\u7ec4\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684&#xff08;\u5728\u6b64\u4f8b\u4e2d\u4e3a4096\u5b57\u8282&#xff09;&#xff0c;\u4f46\u5176\u4e2d\u53ea\u6709\u90e8\u5206\u662f\u5b9e\u9645\u63a5\u6536\u5230\u7684\u6570\u636e&#xff0c;\u6240\u4ee5\u8fd8\u9700\u8981\u6307\u5b9a\u5b57\u8282\u6570\u7ec4\u7684\u6709\u6548\u957f\u5ea6\u3002<\/p>\n<\/li>\n<li>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"442\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418112341-6802363d5a611.png\" width=\"1104\" \/>requestPacket.getLength(): \u8fd9\u4e2a\u65b9\u6cd5\u8c03\u7528\u8fd4\u56de\u7684\u662f\u5b9e\u9645\u63a5\u6536\u5230\u7684\u6570\u636e\u7684\u957f\u5ea6&#xff0c;\u4e5f\u5c31\u662f\u6709\u6548\u957f\u5ea6\u3002\u7531\u4e8eUDP\u6570\u636e\u5305\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684&#xff0c;\u800c\u5b9e\u9645\u4f20\u8f93\u7684\u6570\u636e\u53ef\u80fd\u8f83\u5c11&#xff0c;\u56e0\u6b64getLength()\u7684\u503c\u53ef\u80fd\u5c0f\u4e8egetData().length\u3002\u8fd9\u4e2a\u65b9\u6cd5\u786e\u4fdd\u53ea\u5904\u7406\u5b9e\u9645\u63a5\u6536\u5230\u7684\u6570\u636e&#xff0c;\u800c\u4e0d\u662f\u6574\u4e2a4096\u5b57\u8282\u7684\u6570\u7ec4\u3002<\/p>\n<\/li>\n<li>\n<p>0: \u8fd9\u662f\u5b57\u8282\u6570\u7ec4\u7684\u504f\u79fb\u91cf&#xff0c;\u8868\u793a\u4ece\u6570\u7ec4\u7684\u7b2c0\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n<\/li>\n<li>\n<p>new String(&#8230;): \u8fd9\u662f\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u8c03\u7528&#xff0c;\u7528\u4e8e\u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002\u8fd9\u91cc\u4f7f\u7528\u7684\u662f\u7279\u5b9a\u8303\u56f4\u7684\u5b57\u8282\u6570\u7ec4&#xff08;\u4ece\u504f\u79fb\u91cf0\u5f00\u59cb&#xff0c;\u957f\u5ea6\u4e3arequestPacket.getLength()&#xff09;\u6765\u521b\u5efa\u5b57\u7b26\u4e32&#xff0c;\u800c\u4e0d\u662f\u6574\u4e2a\u6570\u7ec4\u3002<\/p>\n<\/li>\n<h3 id=\"7%EF%BC%89\">7&#xff09;<\/h3>\n<p>String response&#061;process(request); <\/p>\n<p>\u8fd9\u4e00\u6bb5\u4ee3\u7801\u7684\u542b\u4e49\u662f\u6839\u636e\u8bf7\u6c42\u6765\u4f5c\u51fa\u54cd\u5e94&#xff0c;\u4e00\u822c\u6765\u8bf4\u662f\u4e00\u4e2a\u670d\u52a1\u5668\u6700\u5173\u952e\u7684\u903b\u8f91&#xff0c;\u4f46\u662f\u6b64\u5904\u7684\u670d\u52a1\u5668\u662f\u56de\u663e\u670d\u52a1\u5668&#xff0c;\u6240\u4ee5\u8fd9\u4e2a\u903b\u8f91\u88ab\u7701\u7565\u4e86\u3002<\/p>\n<p>\u53ef\u4ee5response&#061;request&#xff0c;\u4f46\u662f\u6b64\u5904\u5c06\u505a\u51fa\u76f8\u5e94\u7684\u903b\u8f91\u6784\u5efa\u6210\u4e86\u4e00\u4e2aprocess\u65b9\u6cd5&#xff0c;\u65b9\u4fbf\u540e\u7eed\u505a\u5176\u4ed6\u670d\u52a1\u5668&#xff1a;<\/p>\n<p> private String process(String request) {<br \/>\n        return request;<br \/>\n    } <\/p>\n<h3 id=\"8%EF%BC%89\">8&#xff09;<\/h3>\n<p> DatagramPacket responsePacket &#061; new<br \/>\nDatagramPacket(response.getBytes(),response.getBytes().length,<br \/>\nrequestPacket.getSocketAddress()); <\/p>\n<p>\u518d\u6b21\u6784\u5efa\u4e00\u4e2aDatagramPacket\u5bf9\u8c61\u4f5c\u4e3a\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u7684\u6570\u636e\u62a5&#xff1a;responsePacket\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"625\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418112341-6802363d976f2.png\" width=\"1431\" \/><\/p>\n<h4 id=\"1.%C2%A0response.getBytes()%3A\">1.\u00a0response.getBytes():<\/h4>\n<ul>\n<li>\u8fd9\u4e2a\u65b9\u6cd5\u5c06 \u524d\u9762\u63a5\u53d7reqest\u540e\u5f97\u5230\u7684String\u00a0\u7c7b\u578b\u7684\u00a0response\u00a0\u8f6c\u6362\u4e3a\u00a0byte[]\u00a0\u7c7b\u578b\u7684\u6570\u7ec4\u3002<\/li>\n<li>getBytes()\u00a0\u65b9\u6cd5\u4f1a\u6839\u636e\u5e73\u53f0\u7684\u9ed8\u8ba4\u5b57\u7b26\u96c6\u5c06\u5b57\u7b26\u4e32\u7f16\u7801\u4e3a\u5b57\u8282\u6570\u7ec4\u3002<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"534\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418112341-6802363de6290.png\" width=\"1260\" \/><\/p>\n<h4 id=\"2.response.getBytes().length%3A%C2%A0\">2.response.getBytes().length:\u00a0<\/h4>\n<ul>\n<li>\u8fd9\u91cc\u8c03\u7528\u4e86\u00a0response.getBytes()\u00a0\u65b9\u6cd5\u5f97\u5230\u7684\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/li>\n<li>\u8fd9\u4e2a\u957f\u5ea6\u8868\u793a\u5b9e\u9645\u54cd\u5e94\u6570\u636e\u7684\u603b\u5b57\u8282\u6570&#xff0c;\u786e\u4fdd\u53d1\u9001\u7684\u6570\u636e\u62a5\u4e2d\u53ea\u5305\u542b\u6709\u6548\u7684\u54cd\u5e94\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<p> \u957f\u5ea6\u8981\u7528response.getBytes().length,\u56e0\u4e3aresponse\u662f\u5b57\u7b26\u4e32,\u9700\u8981\u5148\u8f6c\u6210\u4e8c\u8fdb\u5236\u6570\u7ec4,\u624d\u80fd\u83b7\u53d6\u5230\u6570\u7ec4\u7684\u957f\u5ea6<br \/>\n\u4e0d\u80fd\u7528response.length,\u56e0\u4e3aresponse\u662f\u5b57\u7b26\u4e32,\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u662f\u5b57\u7b26\u7684\u4e2a\u6570,\u800c\u4e0d\u662f\u4e8c\u8fdb\u5236\u6570\u7ec4\u7684\u957f\u5ea6 <\/p>\n<h4 id=\"3.requestPacket.getSocketAddress()%3A%C2%A0\">3.requestPacket.getSocketAddress():\u00a0<\/h4>\n<ul>\n<li>\u8fd9\u4e2a\u65b9\u6cd5\u7528\u4e8e\u83b7\u53d6\u53d1\u9001\u8bf7\u6c42\u7684\u6570\u636e\u62a5&#xff08;requestPacket&#xff09;\u7684\u6e90\u5730\u5740&#xff08;SocketAddress&#xff09;\u3002<\/li>\n<li>SocketAddress\u00a0\u5305\u542b\u4e86\u5ba2\u6237\u7aef\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u4fe1\u606f&#xff0c;\u8fd9\u6837\u670d\u52a1\u5668\u5c31\u80fd\u77e5\u9053\u5c06\u54cd\u5e94\u6570\u636e\u53d1\u9001\u56de\u54ea\u4e2a\u5ba2\u6237\u7aef\u3002<\/li>\n<\/ul>\n<p>\u00a0<img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"486\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418112342-6802363e2fdef.png\" width=\"1204\" \/><\/p>\n<h4 id=\"4.DatagramPacket%20responsePacket%20%3D%20new%20DatagramPacket%C2%A0\">4.DatagramPacket responsePacket &#061; new DatagramPacket\u00a0<\/h4>\n<ul>\n<li>\u8fd9\u91cc\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u00a0DatagramPacket\u00a0\u5bf9\u8c61&#xff0c;\u547d\u540d\u4e3a\u00a0responsePacket\u3002<\/li>\n<li>\u6784\u9020\u51fd\u6570\u00a0DatagramPacket(byte[] buf, int length, SocketAddress address)\u00a0\u7684\u53c2\u6570\u5206\u522b\u4e3a&#xff1a;\n<ul>\n<li>byte[] buf: \u8981\u53d1\u9001\u7684\u6570\u636e\u7684\u5b57\u8282\u6570\u7ec4\u3002<\/li>\n<li>int length: \u6570\u636e\u7684\u6709\u6548\u957f\u5ea6\u3002<\/li>\n<li>SocketAddress address: \u76ee\u6807\u5730\u5740&#xff0c;\u5373\u8981\u53d1\u9001\u5230\u7684\u5ba2\u6237\u7aef\u5730\u5740\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 id=\"9%EF%BC%89\">9&#xff09;<\/h3>\n<p>  socket.send(responsePacket); <\/p>\n<p>\u53d1\u9001\u6570\u636e\u5305\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u7531\u4e8e\u524d\u9762\u4f7f\u7528\u4e86requestPacket.getSocketAddress()\u65b9\u6cd5\u5c06\u6e90ip\u3001\u6e90\u7aef\u53e3\u53f7\u90fd\u4f20\u7ed9\u4e86requestPacket&#xff0c;\u6240\u4ee5\u6b64\u5904UDP\u5df2\u7ecf\u77e5\u9053\u4e86\u8be5\u53d1\u9001\u7ed9\u8c01\u3002<\/p>\n<h3 id=\"10%EF%BC%89\">10&#xff09;<\/h3>\n<p>    System.out.printf(<br \/>\n                    &#034;[%s:%d] request:%s, response:%s\\\\n&#034;,<br \/>\n                    requestPacket.getAddress().toString(), \/\/ \u5ba2\u6237\u7aefIP\u5730\u5740<br \/>\n                    requestPacket.getPort(),               \/\/ \u5ba2\u6237\u7aef\u7aef\u53e3\u53f7<br \/>\n                    request,                               \/\/ \u8bf7\u6c42\u5185\u5bb9<br \/>\n                    response                               \/\/ \u54cd\u5e94\u5185\u5bb9<br \/>\n            ); <\/p>\n<p>\u6253\u5370\u4e00\u4e2a\u65e5\u5fd7&#xff0c;\u65b9\u4fbf\u8c03\u8bd5\u548c\u76d1\u63a7\u3002<\/p>\n<h3 id=\"11%EF%BC%89\">11&#xff09;<\/h3>\n<p> public static void main(String[] args) throws IOException {<br \/>\n        UdpEchoClient client &#061; new UdpEchoClient(&#034;127.0.0.1&#034;, 9090);<br \/>\n        client.start();<br \/>\n    } <\/p>\n<p>\u00a0\u5728main\u65b9\u6cd5\u4e2d\u5b9e\u4f8b\u5316\u670d\u52a1\u5668&#xff0c;\u5e76\u6307\u5b9a\u4e86\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\u662f9090\u3002<\/p>\n<h2 id=\"2.%E5%AE%A2%E6%88%B7%E7%AB%AF\">2.\u5ba2\u6237\u7aef<\/h2>\n<h3 id=\"%EF%BC%881%EF%BC%89%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5\">&#xff08;1&#xff09;\u57fa\u672c\u6982\u5ff5<\/h3>\n<p>\u5ba2\u6237\u7aef\u662f\u00a0\u53d1\u8d77\u8bf7\u6c42\u00a0\u7684\u4e00\u65b9&#xff0c;\u4e3b\u52a8\u8fde\u63a5\u670d\u52a1\u5668\u5e76\u53d1\u9001\u8bf7\u6c42&#xff0c;\u7136\u540e\u7b49\u5f85\u670d\u52a1\u5668\u7684\u54cd\u5e94\u3002 \u5178\u578b\u573a\u666f&#xff1a;\u6d4f\u89c8\u5668\u3001\u79fb\u52a8\u5e94\u7528\u3001\u684c\u9762\u7a0b\u5e8f\u7b49\u3002<\/p>\n<h3 id=\"%EF%BC%882%EF%BC%89%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0\">&#xff08;2&#xff09;\u4ee3\u7801\u5b9e\u73b0<\/h3>\n<p>public class UdpEchoClient {<br \/>\n    private DatagramSocket socket &#061; null;<br \/>\n    \/\/UDP\u672c\u8eab\u4e0d\u4fdd\u5b58\u5bf9\u65b9\u4fe1\u606f&#xff0c;\u5728\u81ea\u5df1\u7684\u4ee3\u7801\u4e2d\u4fdd\u5b58\u4e00\u4e0b<br \/>\n    private String sercerIp;<br \/>\n    private int serverPort;<\/p>\n<p>    \/\/\u548c\u670d\u52a1\u5668\u4e0d\u540c&#xff0c;\u5ba2\u6237\u7aef\u7684\u6784\u9020\u65b9\u6cd5\u4e0d\u80fd\u53ea\u6709\u4e00\u4e2a\u7aef\u53e3\u53f7&#xff0c;\u8fd8\u8981\u6709ip\u5730\u5740<br \/>\n    public UdpEchoClient(String sercerIp, int serverPort) throws SocketException {<br \/>\n        this.sercerIp &#061; sercerIp;<br \/>\n        this.serverPort &#061; serverPort;<br \/>\n        \/\/\u521b\u5efa\u4e00\u4e2asocket&#xff0c;\u4e0d\u80fd\u4f20\u5165\u7aef\u53e3\u53f7&#xff0c;\u56e0\u4e3a\u7aef\u53e3\u53f7\u4f1a\u6709\u7ade\u4e89&#xff0c;\u8ba9\u7cfb\u7edf\u968f\u673a\u5206\u914d\u4e00\u4e2a\u7a7a\u95f2\u7684\u5373\u53ef<br \/>\n        socket &#061; new DatagramSocket();<br \/>\n    }<\/p>\n<p>    \/\/\u542f\u52a8\u5ba2\u6237\u7aef<br \/>\n    public void start() throws IOException {<br \/>\n        Scanner sc &#061; new Scanner(System.in);<br \/>\n        while (true) {<br \/>\n            \/\/1.\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u7684\u6570\u636e<br \/>\n            System.out.println(&#034;\u8bf7\u8f93\u5165\u8981\u53d1\u9001\u7684\u6570\u636e&#034;);<br \/>\n            String request &#061; sc.next();<br \/>\n            \/\/2.\u5c06\u8bf7\u6c42\u53d1\u9001\u7ed9\u670d\u52a1\u5668,\u6784\u5efa\u4e00\u4e2aDatagramPacket\u5bf9\u8c61,\u53d1\u9001\u7ed9\u670d\u52a1\u5668<br \/>\n            DatagramPacket packet &#061; new DatagramPacket(request.getBytes(), request.getBytes().length, InetAddress.getByName(sercerIp), serverPort);<br \/>\n            \/\/3.\u53d1\u9001\u6570\u636e<br \/>\n            socket.send(packet);<br \/>\n            \/\/4.\u63a5\u6536\u670d\u52a1\u5668\u7684\u54cd\u5e94\u6570\u636e<br \/>\n            DatagramPacket responsePacket &#061; new DatagramPacket(new byte[4096], 4096);<br \/>\n            socket.receive(responsePacket);<br \/>\n            \/\/5.\u4ece\u6570\u636e\u5305\u4e2d\u83b7\u53d6\u54cd\u5e94\u6570\u636e,\u6253\u5370\u51fa\u6765<br \/>\n            String response &#061; new String(responsePacket.getData(), 0, responsePacket.getLength());<br \/>\n            System.out.println(&#034;response:&#034; &#043; response);<br \/>\n        }<br \/>\n    }<\/p>\n<p>    public static void main(String[] args) throws IOException {<br \/>\n        UdpEchoClient client &#061; new UdpEchoClient(&#034;127.0.0.1&#034;, 9090);<br \/>\n        client.start();<br \/>\n    }<br \/>\n} <\/p>\n<h3 id=\"%EF%BC%883%EF%BC%89%E9%80%90%E8%A1%8C%E8%A7%A3%E6%9E%90\">&#xff08;3&#xff09;\u9010\u884c\u89e3\u6790<\/h3>\n<h4 id=\"1%EF%BC%89\">1&#xff09;<\/h4>\n<p>  private DatagramSocket socket &#061; null; <\/p>\n<p>\u521b\u5efa\u4e00\u4e2asocket\u7528\u6765\u63a5\u6536\u548c\u53d1\u9001\u6570\u636e<\/p>\n<h4 id=\"2%EF%BC%89\">2&#xff09;<\/h4>\n<p>  private String sercerIp;<br \/>\n    private int serverPort; <\/p>\n<p>\u5b9a\u4e49String\u7c7b\u578b\u7684ip\u5730\u5740\u548cint \u7c7b\u578b\u7684\u7aef\u53e3\u53f7\u3002<\/p>\n<h4 id=\"3%EF%BC%89\">3&#xff09;<\/h4>\n<p> public UdpEchoClient(String sercerIp, int serverPort) throws SocketException {<br \/>\n        this.sercerIp &#061; sercerIp;<br \/>\n        this.serverPort &#061; serverPort;<br \/>\n        \/\/\u521b\u5efa\u4e00\u4e2asocket&#xff0c;\u4e0d\u80fd\u4f20\u5165\u7aef\u53e3\u53f7&#xff0c;\u56e0\u4e3a\u7aef\u53e3\u53f7\u4f1a\u6709\u7ade\u4e89&#xff0c;\u8ba9\u7cfb\u7edf\u968f\u673a\u5206\u914d\u4e00\u4e2a\u7a7a\u95f2\u7684\u5373\u53ef<br \/>\n        socket &#061; new DatagramSocket();<br \/>\n    } <\/p>\n<p>\u521b\u5efa\u5ba2\u6237\u7aef\u7684\u6784\u9020\u65b9\u6cd5\u3002\u4e0e\u670d\u52a1\u5668\u4e0d\u540c\u7684\u662f&#xff0c;\u53c2\u6570\u4e0d\u6b62\u6709\u7aef\u53e3\u53f7&#xff0c;\u8fd8\u6709ip\u5730\u5740&#xff0c;\u56e0\u4e3a\u5ba2\u6237\u7aef\u8981\u77e5\u9053\u670d\u52a1\u5668\u7684ip\u5730\u5740\u548c\u7aef\u53e3\u53f7\u4ee5\u4fbf\u53d1\u9001&#xff0c;\u800c\u670d\u52a1\u5668\u53ea\u9700\u8981\u4e00\u4e2a\u7aef\u53e3\u53f7\u6765\u76d1\u542c\u3001\u63a5\u53d7\u5ba2\u6237\u7aef\u53d1\u9001\u6765\u7684\u6570\u636e\u3002<\/p>\n<h4 id=\"4%EF%BC%89\">4&#xff09;<\/h4>\n<p>  \/\/1.\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u7684\u6570\u636e<br \/>\n            System.out.println(&#034;\u8bf7\u8f93\u5165\u8981\u53d1\u9001\u7684\u6570\u636e&#034;);<br \/>\n            String request &#061; sc.next(); <\/p>\n<p>\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u3002<\/p>\n<h4 id=\"5%EF%BC%89\">5&#xff09;<\/h4>\n<p>DatagramPacket packet &#061; new<br \/>\nDatagramPacket(request.getBytes(), request.getBytes().length,<br \/>\nInetAddress.getByName(sercerIp), serverPort); <\/p>\n<p>\u5c06\u8bf7\u6c42\u53d1\u9001\u7ed9\u670d\u52a1\u5668&#xff1a;\u6784\u5efa\u4e00\u4e2aDatagramPacket\u5bf9\u8c61\u6765\u53d1\u9001\u3002<\/p>\n<p>1.request.getBytes() <\/p>\n<p>\u6765\u5c06\u5b57\u7b26\u4e32request\u4e2d\u7684\u5b57\u8282\u6570\u7ec4\u53d6\u51fa\u6765\u3002<\/p>\n<p>2.request.getBytes().length <\/p>\n<p>\u6307\u5b9a\u5b57\u8282\u6570\u7ec4\u7684\u957f\u5ea6<\/p>\n<p>3.InetAddress.getByName(sercerIp), serverPort <\/p>\n<p>\u4f20\u5165\u670d\u52a1\u5668\u7684ip\u5730\u5740\u548c\u7aef\u53e3\u53f7&#xff0c;\u5176\u4e2dip\u5730\u5740\u662f\u5b57\u7b26\u4e32&#xff0c;\u9700\u8981\u7528getByname&#xff08;&#xff09;\u65b9\u6cd5\u6765\u5305\u88c5\u4e00\u4e0b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"931\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418112342-6802363e68d77.png\" width=\"1330\" \/><\/p>\n<h4 id=\"6%EF%BC%89\">6&#xff09;<\/h4>\n<p> socket.send(packet); <\/p>\n<p>\u00a0\u53d1\u9001\u6570\u636e\u7ed9\u670d\u52a1\u5668\u3002<\/p>\n<h4 id=\"7%EF%BC%89\">7&#xff09;<\/h4>\n<p> DatagramPacket responsePacket &#061; new DatagramPacket(new byte[4096], 4096); <\/p>\n<p>\u6784\u5efa\u4e00\u4e2aDatagramPacket\u5bf9\u8c61\u6765\u4f5c\u4e3a\u670d\u52a1\u5668\u7684\u54cd\u5e94\u6570\u636e<\/p>\n<h4 id=\"8%EF%BC%89\">8&#xff09;<\/h4>\n<p> socket.receive(responsePacket); 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