{"id":10282,"date":"2025-04-18T17:54:48","date_gmt":"2025-04-18T09:54:48","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/10282.html"},"modified":"2025-04-18T17:54:48","modified_gmt":"2025-04-18T09:54:48","slug":"%e3%80%90javaee%e5%88%9d%e9%98%b6%e3%80%91-tcp%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%8e%e5%ae%a2%e6%88%b7%e7%ab%af%e7%9a%84%e6%90%ad%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/10282.html","title":{"rendered":"\u3010JavaEE\u521d\u9636\u3011 TCP\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u7684\u642d\u5efa"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>&#x1f332;\u524d\u8a00<\/li>\n<li>&#x1f334;ServerSocket API<\/li>\n<li>&#x1f384;Socket API<\/li>\n<li>&#x1f340;TCP\u4e2d\u7684\u957f\u77ed\u8fde\u63a5<\/li>\n<li>&#x1f38d;\u5efa\u7acbTCP\u56de\u663e\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668<\/li>\n<li>\n<ul>\n<li>&#x1f6a9;TCP\u642d\u5efa\u670d\u52a1\u5668<\/li>\n<li>&#x1f6a9;TCP\u642d\u5efa\u5ba2\u6237\u7aef<\/li>\n<li>&#x1f6a9;\u901a\u4fe1\u8fc7\u7a0b\u5c55\u793a&#xff1a;<\/li>\n<\/ul>\n<\/li>\n<li>&#x1f333;\u591a\u4e2a\u5ba2\u6237\u7aef\u5bf9\u4e00\u4e2a\u670d\u52a1\u5668<\/li>\n<li>\n<ul>\n<li>&#x1f6a9;\u62d3\u5c55&#xff08;IO\u591a\u8def\u590d\u7528\/IO\u591a\u8def\u8f6c\u63a5&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u2b55\u603b\u7ed3<\/li>\n<\/ul>\n<h2>&#x1f332;\u524d\u8a00<\/h2>\n<p>TCP\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u7684\u642d\u5efa\u9700\u8981\u501f\u52a9\u4ee5\u4e0bAPI<\/p>\n<p>TCP\u4e4b\u95f4\u901a\u4fe1\u901a\u8fc7\u6d41\u8fdb\u884c\u4f20\u8f93&#xff0c;\u65e0\u8bba\u662f\u670d\u52a1\u5668\u8fd8\u662f\u5ba2\u6237\u7aef&#xff1a;\u8bfb\u53d6\u5185\u5bb9\u7528\u8f93\u5165\u6d41&#xff0c;\u5199\u5165\u5185\u5bb9\u7528\u8f93\u51fa\u6d41<\/p>\n<h2>&#x1f334;ServerSocket API<\/h2>\n<p>ServerSocket \u662f\u521b\u5efaTCP\u670d\u52a1\u7aefSocket\u7684API\u3002<\/p>\n<p>ServerSocket \u6784\u9020\u65b9\u6cd5&#xff1a;<\/p>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>ServerSocket(int port)<\/td>\n<td>\u521b\u5efa\u4e00\u4e2a\u670d\u52a1\u7aef\u6d41\u5957\u63a5\u5b57Socket&#xff0c;\u5e76\u7ed1\u5b9a\u5230\u6307\u5b9a\u7aef\u53e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>ServerSocket \u65b9\u6cd5&#xff1a;<\/p>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>Socket accept()<\/td>\n<td>\u5f00\u59cb\u76d1\u542c\u6307\u5b9a\u7aef\u53e3&#xff08;\u521b\u5efa\u65f6\u7ed1\u5b9a\u7684\u7aef\u53e3&#xff09;&#xff0c;\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u540e&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u670d\u52a1\u7aefSocket\u5bf9\u8c61&#xff0c;\u5e76\u57fa\u4e8e\u8be5Socket\u5efa\u7acb\u4e0e\u5ba2\u6237\u7aef\u7684\u8fde\u63a5&#xff0c;\u5426\u5219\u963b\u585e\u7b49\u5f85<\/td>\n<\/tr>\n<tr>\n<td>void close()<\/td>\n<td>\u5173\u95ed\u6b64\u5957\u63a5\u5b57<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>&#x1f384;Socket API<\/h2>\n<p>Socket \u662f\u5ba2\u6237\u7aefSocket&#xff0c;\u6216\u670d\u52a1\u7aef\u4e2d\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5&#xff08;accept\u65b9\u6cd5&#xff09;\u7684\u8bf7\u6c42\u540e&#xff0c;\u8fd4\u56de\u7684\u670d\u52a1\u7aefSocket\u3002<\/p>\n<p>\u4e0d\u7ba1\u662f\u5ba2\u6237\u7aef\u8fd8\u662f\u670d\u52a1\u7aefSocket&#xff0c;\u90fd\u662f\u53cc\u65b9\u5efa\u7acb\u8fde\u63a5\u4ee5\u540e&#xff0c;\u4fdd\u5b58\u7684\u5bf9\u7aef\u4fe1\u606f&#xff0c;\u53ca\u7528\u6765\u4e0e\u5bf9\u65b9\u6536\u53d1\u6570\u636e\u7684\u3002<\/p>\n<p>Socket \u6784\u9020\u65b9\u6cd5&#xff1a;<\/p>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>Socket(String host, intport)<\/td>\n<td>\u521b\u5efa\u4e00\u4e2a\u5ba2\u6237\u7aef\u6d41\u5957\u63a5\u5b57Socket&#xff0c;\u5e76\u4e0e\u5bf9\u5e94IP\u7684\u4e3b\u673a\u4e0a&#xff0c;\u5bf9\u5e94\u7aef\u53e3\u7684\u8fdb\u7a0b\u5efa\u7acb\u8fde\u63a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Socket \u65b9\u6cd5&#xff1a;<\/p>\n<table>\n<tr>\u65b9\u6cd5\u7b7e\u540d\u65b9\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>InetAddress getInetAddress()<\/td>\n<td>\u8fd4\u56de\u5957\u63a5\u5b57\u6240\u8fde\u63a5\u7684\u5730\u5740<\/td>\n<\/tr>\n<tr>\n<td>InputStream getInputStream()<\/td>\n<td>\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u5165\u6d41<\/td>\n<\/tr>\n<tr>\n<td>OutputStream getOutputStream()<\/td>\n<td>\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u51fa\u6d41<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>&#x1f340;TCP\u4e2d\u7684\u957f\u77ed\u8fde\u63a5<\/h2>\n<p>\u535a\u4e3b\u5728\u524d\u9762\u7684\u535a\u6587\u91cc\u9762\u8bf4\u5230&#xff0c;TCP\u662f\u9762\u5411\u8fde\u63a5\u7684\u901a\u4fe1\u65b9\u5f0f&#xff0c;TCP\u53d1\u9001\u6570\u636e\u65f6&#xff0c;\u9700\u8981\u5148\u5efa\u7acb\u8fde\u63a5&#xff0c;\u800c\u8fd9\u4e2a\u8fde\u63a5\u53c8\u5206\u4e3a\u957f\u77ed\u8fde\u63a5&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u77ed\u8fde\u63a5&#xff1a;\u6bcf\u6b21\u63a5\u6536\u5230\u6570\u636e\u5e76\u8fd4\u56de\u54cd\u5e94\u540e&#xff0c;\u90fd\u5173\u95ed\u8fde\u63a5&#xff0c;\u5373\u662f\u77ed\u8fde\u63a5\u3002\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u77ed\u8fde\u63a5\u53ea\u80fd\u4e00\u6b21\u6536\u53d1\u6570\u636e\u3002<\/p>\n<\/li>\n<li>\n<p>\u957f\u8fde\u63a5&#xff1a;\u4e0d\u5173\u95ed\u8fde\u63a5&#xff0c;\u4e00\u76f4\u4fdd\u6301\u8fde\u63a5\u72b6\u6001&#xff0c;\u53cc\u65b9\u4e0d\u505c\u7684\u6536\u53d1\u6570\u636e&#xff0c;\u5373\u662f\u957f\u8fde\u63a5\u3002\u4e5f\u5c31\u662f\u8bf4&#xff0c;\u957f\u8fde\u63a5\u53ef\u4ee5\u591a\u6b21\u6536\u53d1\u6570\u636e<\/p>\n<\/li>\n<\/ul>\n<p>\u5bf9\u6bd4\u4ee5\u4e0a\u957f\u77ed\u8fde\u63a5&#xff0c;\u4e24\u8005\u533a\u522b\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u5efa\u7acb\u8fde\u63a5\u3001\u5173\u95ed\u8fde\u63a5\u7684\u8017\u65f6&#xff1a;\u77ed\u8fde\u63a5\u6bcf\u6b21\u8bf7\u6c42\u3001\u54cd\u5e94\u90fd\u9700\u8981\u5efa\u7acb\u8fde\u63a5&#xff0c;\u5173\u95ed\u8fde\u63a5&#xff1b;\u800c\u957f\u8fde\u63a5\u53ea\u9700\u8981\u7b2c\u4e00\u6b21\u5efa\u7acb\u8fde\u63a5&#xff0c;\u4e4b\u540e\u7684\u8bf7\u6c42\u3001\u54cd\u5e94\u90fd\u53ef\u4ee5\u76f4\u63a5\u4f20\u8f93\u3002\u76f8\u5bf9\u6765\u8bf4\u5efa\u7acb\u8fde\u63a5&#xff0c;\u5173\u95ed\u8fde\u63a5\u4e5f\u662f\u8981\u8017\u65f6\u7684&#xff0c;\u957f\u8fde\u63a5\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e3b\u52a8\u53d1\u9001\u8bf7\u6c42\u4e0d\u540c&#xff1a;\u77ed\u8fde\u63a5\u4e00\u822c\u662f\u5ba2\u6237\u7aef\u4e3b\u52a8\u5411\u670d\u52a1\u7aef\u53d1\u9001\u8bf7\u6c42&#xff1b;\u800c\u957f\u8fde\u63a5\u53ef\u4ee5\u662f\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u9001\u8bf7\u6c42&#xff0c;\u4e5f\u53ef\u4ee5\u662f\u670d\u52a1\u7aef\u4e3b\u52a8\u53d1\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e24\u8005\u7684\u4f7f\u7528\u573a\u666f\u6709\u4e0d\u540c&#xff1a;\u77ed\u8fde\u63a5\u9002\u7528\u4e8e\u5ba2\u6237\u7aef\u8bf7\u6c42\u9891\u7387\u4e0d\u9ad8\u7684\u573a\u666f&#xff0c;\u5982\u6d4f\u89c8\u7f51\u9875\u7b49\u3002\u957f\u8fde\u63a5\u9002\u7528\u4e8e\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u901a\u4fe1\u9891\u7e41\u7684\u573a\u666f&#xff0c;\u5982\u804a\u5929\u5ba4&#xff0c;\u5b9e\u65f6\u6e38\u620f\u7b49<\/p>\n<\/li>\n<\/ul>\n<p>\u62d3\u5c55&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u57fa\u4e8eBIO&#xff08;\u540c\u6b65\u963b\u585eIO&#xff09;\u7684\u957f\u8fde\u63a5\u4f1a\u4e00\u76f4\u5360\u7528\u7cfb\u7edf\u8d44\u6e90\u3002\u5bf9\u4e8e\u5e76\u53d1\u8981\u6c42\u5f88\u9ad8\u7684\u670d\u52a1\u7aef\u7cfb\u7edf\u6765\u8bf4&#xff0c;\u8fd9\u6837\u7684\u6d88\u8017\u662f\u4e0d\u80fd\u627f\u53d7\u7684\u3002<\/p>\n<\/li>\n<li>\n<p>\u7531\u4e8e\u6bcf\u4e2a\u8fde\u63a5\u90fd\u9700\u8981\u4e0d\u505c\u7684\u963b\u585e\u7b49\u5f85\u63a5\u6536\u6570\u636e&#xff0c;\u6240\u4ee5\u6bcf\u4e2a\u8fde\u63a5\u90fd\u4f1a\u5728\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u8fd0\u884c\u3002\u4e00\u6b21\u963b\u585e\u7b49\u5f85\u5bf9\u5e94\u7740\u4e00\u6b21\u8bf7\u6c42\u3001\u54cd\u5e94&#xff0c;\u4e0d\u505c\u5904\u7406\u4e5f\u5c31\u662f\u957f\u8fde\u63a5\u7684\u7279\u6027&#xff1a;\u4e00\u76f4\u4e0d\u5173\u95ed\u8fde\u63a5&#xff0c;\u4e0d\u505c\u7684\u5904\u7406\u8bf7\u6c42<\/p>\n<\/li>\n<li>\n<p>\u5b9e\u9645\u5e94\u7528\u65f6&#xff0c;\u670d\u52a1\u7aef\u4e00\u822c\u662f\u57fa\u4e8eNIO&#xff08;\u5373\u540c\u6b65\u975e\u963b\u585eIO&#xff09;\u6765\u5b9e\u73b0\u957f\u8fde\u63a5&#xff0c;\u6027\u80fd\u53ef\u4ee5\u6781\u5927\u7684\u63d0\u5347\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u535a\u4e3b\u4e0b\u9762\u5b9e\u73b0\u7684TCP\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u5c5e\u4e8e\u957f\u8fde\u63a5<\/p>\n<h2>&#x1f38d;\u5efa\u7acbTCP\u56de\u663e\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668<\/h2>\n<p>\u4ec0\u4e48\u53eb\u56de\u663e\u5ba2\u6237\u7aef\u4e0e\u4e0e\u670d\u52a1\u5668\u5462&#xff1f;<\/p>\n<p>\u5176\u5b9e\u5c31\u662f&#xff1a;\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u7aef\u53d1\u9001\u8bf7\u6c42&#xff0c;\u4e00\u822c\u6765\u8bf4\u6211\u4eec\u7684\u670d\u52a1\u7aef\u4f1a\u5bf9\u6211\u4eec\u53d1\u9001\u7684\u8bf7\u6c42\u8fdb\u884c\u5904\u7406&#xff0c;\u6211\u4eec\u8fd9\u91cc\u4e3a\u4e86\u7b80\u5355&#xff0c;\u5c31\u7701\u7565\u91cc\u9762\u7684\u5904\u7406\u8fc7\u7a0b&#xff0c;\u53ea\u5b9e\u73b0\u5c06\u8bf7\u6c42\u91cd\u65b0\u53d1\u56de\u5ba2\u6237\u7aef&#xff0c;\u4e0d\u505a\u4efb\u4f55\u5904\u7406\u3002<\/p>\n<h3>&#x1f6a9;TCP\u642d\u5efa\u670d\u52a1\u5668<\/h3>\n<p>\u6211\u4eec\u5206\u4e3a\u4ee5\u4e0b\u51e0\u6b65\u6765\u5b9e\u73b0&#xff1a;<\/p>\n<li>\n<p>\u521b\u5efaTcpEchoServer\u7c7b\u6765\u8868\u793a\u6211\u4eec\u7684\u670d\u52a1\u5668&#xff0c;\u5e76\u521b\u5efaServerSocket\u5bf9\u8c61&#xff0c;\u521d\u59cb\u503c\u4e3anull<\/p>\n<\/li>\n<li>\n<p>\u5728TcpEchoServer\u7684\u6784\u9020\u65b9\u6cd5\u91cc\u8fdb\u884cServerSocket\u5bf9\u8c61\u7684\u5b9e\u4f8b\u5316<\/p>\n<\/li>\n<li>\n<p>\u7528\u4e00\u4e2astart()\u65b9\u6cd5\u8868\u793a\u542f\u52a8\u7a0b\u5e8f<\/p>\n<\/li>\n<li>\n<p>\u5728\u8be5\u65b9\u6cd5\u5185\u6211\u4eec\u9996\u5148\u8981\u4f7f\u7528accept()\u8fdb\u884c\u8fde\u63a5&#xff0c;\u5e76\u7528Socket\u5bf9\u8c61\u8fdb\u884c\u63a5\u6536<\/p>\n<\/li>\n<li>\n<p>\u6211\u4eec\u518d\u7528\u4e00\u4e2aprocessConnection(Socket clientSocket)\u65b9\u6cd5\u5904\u7406\u6211\u4eec\u7684\u8fde\u63a5<\/p>\n<\/li>\n<p>\u7531\u4e8e\u6211\u4eec\u7684TCP\u4f20\u8f93\u662f\u4ee5\u6d41\u7684\u5f62\u5f0f\u4f20\u64ad\u7684&#xff0c;\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u7528\u5230\u4e86\u8bfb\u5199\u6570\u636e\u6d41\u7684\u65b9\u6cd5\u6765\u8fdb\u884c\u4e66\u5199&#xff0c;\u4e0d\u4f1a\u8fd9\u4e00\u90e8\u5206\u7684\u5c0f\u4f19\u4f34&#xff0c;\u53ef\u4ee5\u53bb\u770b\u770b\u535a\u4e3b\u6240\u5199\u300a\u3010JavaEE\u521d\u9636\u3011 \u6587\u4ef6\u5185\u5bb9\u7684\u8bfb\u5199 \u2014\u2014 \u6570\u636e\u6d41\u300b\u8fdb\u884c\u67e5\u770b\u5b66\u4e60<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u4e66\u5199\u8fd9\u4e2aprocessConnection(Socket clientSocket)\u65b9\u6cd5<\/p>\n<li>\n<p>\u8bfb\u53d6\u8bf7\u6c42&#xff0c;\u6784\u9020\u8f93\u5165\u6d41\u7684Scanner&#xff0c;\u5e76\u5224\u65ad\u540e\u9762\u5982\u679c\u6ca1\u6709\u6570\u636e\u5c31\u5173\u95ed\u8fde\u63a5<\/p>\n<\/li>\n<li>\n<p>\u7136\u540e\u6211\u4eec\u5c06\u8bfb\u53d6\u7684\u6570\u636e\u4ea4\u7ed9\u6211\u4eec\u7684 response()\u6784\u9020\u54cd\u5e94<\/p>\n<\/li>\n<li>\n<p>\u54cd\u5e94\u540e\u7684\u6570\u636e\u5199\u5165\u8be5\u5957\u63a5\u5b57\u7684\u8f93\u51fa\u6d41\u4e2d&#xff0c;\u6700\u540eflush()&#xff0c;\u8fdb\u884c\u5237\u65b0&#xff0c;\u786e\u4fdd\u5199\u5165<\/p>\n<\/li>\n<p>\u4e3a\u4e86\u91ca\u653e\u8d44\u6e90&#xff0c;\u6211\u4eec\u6bcf\u4e00\u6b21\u4ea4\u4e92\u5b8c\u6bd5\u90fd\u9700\u8981\u5bf9\u6211\u4eec\u7684\u5957\u63a5\u5b57\u8fdb\u884c\u5173\u95ed&#xff0c;\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528fially\u6765\u8fdb\u884c\u5904\u7406<\/p>\n<p>\u4ee3\u7801\u5b9e\u73b0\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><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 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><\/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 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><br \/>\n        <span class=\"token class-name\">Socket<\/span> socket <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><\/p>\n<p>        <span class=\"token function\">processConnection<\/span><span class=\"token punctuation\">(<\/span>socket<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u6765\u5904\u7406\u4e00\u4e2a\u8fde\u63a5.<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8fd9\u4e00\u4e2a\u8fde\u63a5\u5bf9\u5e94\u5230\u4e00\u4e2a\u5ba2\u6237\u7aef. \u4f46\u662f\u8fd9\u91cc\u53ef\u80fd\u4f1a\u6d89\u53ca\u5230\u591a\u6b21\u4ea4\u4e92.<\/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!\\\\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><span class=\"token function\">toString<\/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 comment\">\/\/ \u57fa\u4e8e\u4e0a\u8ff0 socket \u5bf9\u8c61\u548c\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1<\/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 comment\">\/\/ \u7531\u4e8e\u8981\u5904\u7406\u591a\u4e2a\u8bf7\u6c42\u548c\u54cd\u5e94, \u4e5f\u662f\u4f7f\u7528\u5faa\u73af\u6765\u8fdb\u884c.<\/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<\/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 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><br \/>\n                    <span class=\"token comment\">\/\/ \u6ca1\u6709\u4e0b\u4e2a\u6570\u636e, \u8bf4\u660e\u8bfb\u5b8c\u4e86. (\u5ba2\u6237\u7aef\u5173\u95ed\u4e86\u8fde\u63a5)<\/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\u4e0b\u7ebf! \\\\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><span class=\"token function\">toString<\/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\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u6ce8\u610f!! \u6b64\u5904\u4f7f\u7528 next \u662f\u4e00\u76f4\u8bfb\u53d6\u5230\u6362\u884c\u7b26\/\u7a7a\u683c\/\u5176\u4ed6\u7a7a\u767d\u7b26\u7ed3\u675f, \u4f46\u662f\u6700\u7ec8\u8fd4\u56de\u7ed3\u679c\u91cc\u4e0d\u5305\u542b\u4e0a\u8ff0 \u7a7a\u767d\u7b26 .<\/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. \u6839\u636e\u8bf7\u6c42\u6784\u9020\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\u7ed3\u679c.<\/span><br \/>\n                <span class=\"token comment\">\/\/    OutputStream \u6ca1\u6709 write String \u8fd9\u6837\u7684\u529f\u80fd. \u53ef\u4ee5\u628a String \u91cc\u7684\u5b57\u8282\u6570\u7ec4\u62ff\u51fa\u6765, \u8fdb\u884c\u5199\u5165;<\/span><br \/>\n                <span class=\"token comment\">\/\/    \u4e5f\u53ef\u4ee5\u7528\u5b57\u7b26\u6d41\u6765\u8f6c\u6362\u4e00\u4e0b.<\/span><br \/>\n                <span class=\"token class-name\">PrintWriter<\/span> printWriter <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\">\/\/ \u6b64\u5904\u4f7f\u7528 println \u6765\u5199\u5165. \u8ba9\u7ed3\u679c\u4e2d\u5e26\u6709\u4e00\u4e2a \\\\n \u6362\u884c. \u65b9\u4fbf\u5bf9\u7aef\u6765\u63a5\u6536\u89e3\u6790.<\/span><br \/>\n                printWriter<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 comment\">\/\/ flush \u7528\u6765\u5237\u65b0\u7f13\u51b2\u533a, \u4fdd\u8bc1\u5f53\u524d\u5199\u5165\u7684\u6570\u636e, \u786e\u5b9e\u662f\u53d1\u9001\u51fa\u53bb\u4e86.<\/span><br \/>\n                printWriter<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><\/p>\n<p>                <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><span class=\"token function\">toString<\/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><br \/>\n                        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            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u66f4\u5408\u9002\u7684\u505a\u6cd5, \u662f\u628a close \u653e\u5230 finally \u91cc\u9762, \u4fdd\u8bc1\u4e00\u5b9a\u80fd\u591f\u6267\u884c\u5230!!<\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                clientSocket<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><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                e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/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><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/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\">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<p>\u670d\u52a1\u7aef\u542f\u52a8\u5c55\u793a <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418095447-68022167282ca.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f6a9;TCP\u642d\u5efa\u5ba2\u6237\u7aef<\/h3>\n<p>\u642d\u5efa\u5ba2\u6237\u7aef\u6211\u4eec\u4e5f\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u6b65&#xff1a;<\/p>\n<li>\n<p>\u521b\u5efaTcpEchoClient\u7c7b\u8868\u793a\u6211\u4eec\u7684\u5ba2\u6237\u7aef&#xff0c;\u521b\u5efaSoket\u5bf9\u8c61\u7528\u4e8e\u4e0e\u5ba2\u6237\u7aef\u901a\u4fe1\u00b7<\/p>\n<\/li>\n<li>\n<p>\u518dTcpEchoClient\u6784\u9020\u65b9\u6cd5\u91cc\u8fdb\u884c\u5b9e\u4f8b\u5316Socket\u7684\u5bf9\u8c61<\/p>\n<\/li>\n<li>\n<p>\u521b\u5efastart()\u65b9\u6cd5\u7528\u4e8e\u6211\u4eec\u7684\u64cd\u4f5c<\/p>\n<\/li>\n<li>\n<p>\u8bfb\u53d6\u952e\u76d8\u6240\u8981\u8f93\u5165\u7684\u6570\u636e<\/p>\n<\/li>\n<li>\n<p>\u5c06\u6240\u8bfb\u7684\u6570\u636e\u901a\u8fc7\u8f93\u51fa\u6d41\u8fdb\u884c\u5199\u5165<\/p>\n<\/li>\n<li>\n<p>\u8bfb\u53d6\u54cd\u5e94\u7684\u8f93\u5165\u6d41&#xff0c;\u8fdb\u884c\u6253\u5370<\/p>\n<\/li>\n<li>\n<p>main\u51fd\u6570\u4e2d\u8fdb\u884c\u542f\u52a8<\/p>\n<\/li>\n<p>\u4ee3\u7801\u5b9e\u73b0\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><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\">\/\/ Socket \u6784\u9020\u65b9\u6cd5, \u80fd\u591f\u8bc6\u522b \u70b9\u5206\u5341\u8fdb\u5236\u683c\u5f0f\u7684 IP \u5730\u5740. \u6bd4 DatagramPacket \u66f4\u65b9\u4fbf.<\/span><br \/>\n        <span class=\"token comment\">\/\/ new \u8fd9\u4e2a\u5bf9\u8c61\u7684\u540c\u65f6, \u5c31\u4f1a\u8fdb\u884c TCP \u8fde\u63a5\u64cd\u4f5c.<\/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\">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;\u5ba2\u6237\u7aef\u542f\u52a8!&#034;<\/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 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. \u5148\u4ece\u952e\u76d8\u4e0a\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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&gt; &#034;<\/span><span class=\"token punctuation\">)<\/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><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;exit&#034;<\/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><span class=\"token string\">&#034;goodbye&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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 comment\">\/\/ 2. \u628a\u8bfb\u5230\u7684\u5185\u5bb9\u6784\u9020\u6210\u8bf7\u6c42, \u53d1\u9001\u7ed9\u670d\u52a1\u5668.<\/span><br \/>\n                <span class=\"token class-name\">PrintWriter<\/span> printWriter <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                printWriter<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\">\/\/ \u6b64\u5904\u52a0\u4e0a flush \u4fdd\u8bc1\u6570\u636e\u786e\u5b9e\u53d1\u9001\u51fa\u53bb\u4e86.<\/span><br \/>\n                printWriter<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\u7684\u54cd\u5e94<\/span><br \/>\n                <span class=\"token class-name\">Scanner<\/span> respScanner <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\">String<\/span> response <span class=\"token operator\">&#061;<\/span> respScanner<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\">\/\/ 4. \u628a\u54cd\u5e94\u5185\u5bb9\u663e\u793a\u5230\u754c\u9762\u4e0a<\/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            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/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>    <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>\u5ba2\u6237\u7aef\u542f\u52a8\u5c55\u793a&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418095447-6802216736ffa.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f6a9;\u901a\u4fe1\u8fc7\u7a0b\u5c55\u793a&#xff1a;<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418095447-6802216743e16.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418095447-6802216751e00.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>&#x1f333;\u591a\u4e2a\u5ba2\u6237\u7aef\u5bf9\u4e00\u4e2a\u670d\u52a1\u5668<\/h2>\n<p>\u5728\u535a\u4e3b\u5199\u7684\u3010JavaEE\u521d\u9636\u3011 UDP\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u7684\u642d\u5efa\u4e2d\u591a\u4e2a\u5ba2\u6237\u7aef\u9762\u5bf9\u4e00\u4e2a\u670d\u52a1\u5668\u7684\u65f6\u5019&#xff0c;\u6211\u4eec\u53ea\u9700\u8981\u8fdb\u884c\u8bbe\u7f6e\u4ee5\u4e0b\u5373\u53ef&#xff0c;\u4f46\u662f\u4e86&#xff0c;\u5728\u6211\u4eec\u4e0a\u8ff0\u5199\u7684TCP\u4ee3\u7801\u4e2d\u662f\u4e0d\u53ef\u884c\u7684&#xff0c;\u5c31\u7b97\u53ef\u4ee5\u542f\u52a8&#xff0c;\u4f46\u662f\u540e\u7eed\u7684\u5ba2\u6237\u7aef\u4f1a\u51fa\u73b0\u963b\u585e&#xff0c;\u5e76\u4e0d\u4f1a\u6267\u884c\u76f8\u5e94\u54cd\u5e94<\/p>\n<p>\u8fd9\u662f\u56e0\u4e3a\u8fd9\u91cc\u662f\u53ef\u8fde\u63a5\u7684&#xff0c;\u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u8fdb\u884c\u5efa\u7acb\u540e&#xff0c;\u540e\u9762\u7684\u7ebf\u7a0b\u5c31\u53ea\u80fd\u7b49\u5f85\u3002<\/p>\n<p>\u5c31\u76f8\u5f53\u4e8e\u4f60\u6b63\u5728\u548c\u4f60\u7684\u5973\u670b\u53cb\u6253\u7535\u8bdd&#xff0c;\u8fd9\u65f6\u5019\u4f60\u5144\u5f1f\u6253\u7535\u8bdd\u6765\u4e86&#xff0c;\u4f60\u5c31\u53ea\u80fd\u8ba9\u4f60\u5144\u5f1f\u5148\u7b49\u7740&#xff0c;\u7b49\u4f60\u548c\u4f60\u5973\u670b\u53cb\u6253\u5b8c\u7535\u8bdd\u540e&#xff0c;\u624d\u53ef\u4ee5\u63a5\u4f60\u5144\u5f1f\u7684\u7535\u8bdd<\/p>\n<p>\u90a3\u6211\u4eec\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\u4ec0\u4e48\u5462&#xff1f;<\/p>\n<p>\u8fd9\u91cc\u7528\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\u5bf9\u670d\u52a1\u5668\u7528\u591a\u7ebf\u7a0b\u8fdb\u884c\u5904\u7406&#xff0c;\u4f7f\u5f97\u670d\u52a1\u5668\u53ef\u4ee5\u548c\u591a\u53f0\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1\u3002\u7531\u4e8e\u6211\u4eec\u5728\u5b9e\u9645\u5f00\u53d1\u73af\u5883\u4e2d\u5ba2\u6237\u7aef\u975e\u5e38\u7684\u591a&#xff0c;\u800c\u6211\u4eec\u9891\u7e41\u521b\u5efa\u9500\u6bc1\u7ebf\u7a0b\u4f1a\u589e\u52a0\u5f00\u9500&#xff0c;\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u6709\u7528\u4e86\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u6765\u5b9e\u73b0<\/p>\n<p>\u5bf9\u4e0a\u8ff0\u670d\u52a1\u5668\u4fee\u6539\u7684\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/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 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><br \/>\n        <span class=\"token comment\">\/\/ \u6b64\u5904\u4f7f\u7528 CachedThreadPool, \u4f7f\u7528 FixedThreadPool \u4e0d\u592a\u5408\u9002 (\u7ebf\u7a0b\u6570\u4e0d\u592a\u5e94\u8be5\u662f\u6709\u56fa\u5b9a\u7684&#8230;.)<\/span><br \/>\n        <span class=\"token class-name\">ExecutorService<\/span> threadPool <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\">\/\/ \u4f7f\u7528\u8fd9\u4e2a clientSocket \u548c\u5177\u4f53\u7684\u5ba2\u6237\u7aef\u8fdb\u884c\u4ea4\u6d41.<\/span><br \/>\n            <span class=\"token class-name\">Socket<\/span> clientSocket <span 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