{"id":32276,"date":"2025-04-23T16:06:15","date_gmt":"2025-04-23T08:06:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/32276.html"},"modified":"2025-04-23T16:06:15","modified_gmt":"2025-04-23T08:06:15","slug":"%e3%80%90%e7%bd%91%e7%bb%9c%e7%af%87%e3%80%91%e4%bb%8e%e9%9b%b6%e5%86%99udp%e5%ae%a2%e6%88%b7%e7%ab%af-%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%9a%e5%9b%9e%e6%98%be%e7%a8%8b%e5%ba%8f%e6%ba%90%e7%a0%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/32276.html","title":{"rendered":"\u3010\u7f51\u7edc\u7bc7\u3011\u4ece\u96f6\u5199UDP\u5ba2\u6237\u7aef\/\u670d\u52a1\u5668\uff1a\u56de\u663e\u7a0b\u5e8f\u6e90\u7801\u89e3\u6790"},"content":{"rendered":"

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u5927\u5bb6\u597d\u5440 \u6211\u662f\u6d6a\u524d<\/font> \u4eca\u5929\u8bb2\u89e3\u7684\u662f\u7f51\u7edc\u7bc7\u7684\u7b2c\u56db\u7ae0：\u4ece\u96f6\u5199UDP\u5ba2\u6237\u7aef\/\u670d\u52a1\u5668：\u56de\u663e\u7a0b\u5e8f\u6e90\u7801\u89e3\u6790<\/font><\/p>\n<\/p>\n

\u4ece\u96f6\u5199UDP\u5ba2\u6237\u7aef\/\u670d\u52a1\u5668：\u56de\u663e\u7a0b\u5e8f\u6e90\u7801\u89e3\u6790<\/h4>\n
    \n
  • UDP \u534f\u8bae\u7279\u6027\u200b<\/li>\n
  • \n
      \n
    • \u6838\u5fc3\u7c7b\u4ecb\u7ecd\u200b<\/li>\n<\/ul>\n<\/li>\n
    • UDP\u7684socket\u5e94\u8be5\u5982\u4f55\u4f7f\u7528：<\/li>\n
    • 1: DatagramSocket<\/li>\n
    • 2: DatagramPacket<\/li>\n
    • \n
        \n
      • \u56de\u663e\u670d\u52a1\u5668<\/li>\n
      • \u8fdb\u884c\u7f51\u7edc\u7f16\u7a0b\u7684\u7b2c\u4e00\u6b65<\/li>\n
      • \u670d\u52a1\u5668\u7684\u4ee3\u7801(\u56de\u663e\u670d\u52a1\u5668)<\/li>\n
      • \n
          \n
        • \u521b\u5efa\u4e00\u4e2aDatagramSocket\u7684\u5bf9\u8c61：<\/li>\n
        • \u5b9a\u4e49\u670d\u52a1\u5668\u542f\u52a8\u65b9\u6cd5：<\/li>\n
        • \u624b\u52a8\u521b\u5efa\u5185\u5b58\u7a7a\u95f4：<\/li>\n
        • \u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u8f6c\u6210\u5b57\u7b26\u4e32：<\/li>\n
        • \u5c01\u88c5\u5206\u7528：<\/li>\n<\/ul>\n<\/li>\n
        • \u5ba2\u6237\u7aef\u7684\u4ee3\u7801：<\/li>\n
        • \u901a\u4fe1\u8fc7\u7a0b：<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          UDP \u534f\u8bae\u7279\u6027\u200b<\/h2>\n

          UDP（User Datagram Protocol）\u4f5c\u4e3a\u4f20\u8f93\u5c42\u534f\u8bae，\u6709\u7740\u4e0e TCP \u622a\u7136\u4e0d\u540c\u7684\u7279\u6027，\u5728\u7f51\u7edc\u901a\u4fe1\u4e2d\u626e\u6f14\u7740\u72ec\u7279\u7684\u89d2\u8272，\u9002\u7528\u4e8e\u5bf9\u5b9e\u65f6\u6027\u8981\u6c42\u9ad8\u3001\u80fd\u5bb9\u5fcd\u5c11\u91cf\u6570\u636e\u4e22\u5931\u7684\u573a\u666f\u3002\u200b<\/p>\n

          \u65e0\u8fde\u63a5\u901a\u4fe1：UDP \u5728\u6570\u636e\u4f20\u8f93\u524d，\u53d1\u9001\u65b9\u548c\u63a5\u6536\u65b9\u65e0\u9700\u50cf TCP \u90a3\u6837\u8fdb\u884c\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5，\u53ef\u76f4\u63a5\u53d1\u9001\u6570\u636e\u3002\u65e0\u9700\u590d\u6742\u7684\u8fde\u63a5\u5efa\u7acb\u8fc7\u7a0b，\u6781\u5927\u964d\u4f4e\u4e86\u4f20\u8f93\u5ef6\u8fdf\u3002<\/p>\n

          \u4e0d\u53ef\u9760\u4f20\u8f93：\u5b83\u4e0d\u4fdd\u8bc1\u6570\u636e\u4e00\u5b9a\u80fd\u5230\u8fbe\u63a5\u6536\u65b9，\u4e5f\u4e0d\u786e\u4fdd\u6570\u636e\u7684\u987a\u5e8f\u548c\u5b8c\u6574\u6027\u3002\u82e5\u5728\u7f51\u7edc\u4f20\u8f93\u4e2d，UDP \u6570\u636e\u5305\u4e22\u5931\u6216\u4e71\u5e8f，\u534f\u8bae\u672c\u8eab\u4e0d\u4f1a\u91cd\u4f20\u6216\u7ea0\u6b63\u3002<\/p>\n

          \u9762\u5411\u6570\u636e\u62a5：UDP \u4ee5\u72ec\u7acb\u7684\u6570\u636e\u62a5\u4e3a\u5355\u4f4d\u4f20\u8f93\u6570\u636e，\u6bcf\u4e2a\u6570\u636e\u62a5\u90fd\u5305\u542b\u5b8c\u6574\u7684\u76ee\u6807\u5730\u5740\u7b49\u4fe1\u606f，\u53ef\u72ec\u7acb\u4f20\u8f93，\u670d\u52a1\u5668\u6536\u5230\u540e\u76f4\u63a5\u54cd\u5e94，\u7b80\u5355\u9ad8\u6548\u3002\u200b<\/p>\n

          \u5168\u53cc\u5de5\u901a\u4fe1：\u540c\u4e00 UDP Socket \u53ef\u540c\u65f6\u8fdb\u884c\u6570\u636e\u7684\u53d1\u9001\u548c\u63a5\u6536\u3002\u5728\u8bed\u97f3\u901a\u8bdd\u5e94\u7528\u4e2d，\u53cc\u65b9\u80fd\u540c\u65f6\u8bf4\u8bdd\u5e76\u5b9e\u65f6\u542c\u5230\u5bf9\u65b9\u58f0\u97f3，\u5c31\u662f\u56e0\u4e3a UDP \u7684\u5168\u53cc\u5de5\u7279\u6027，\u4fdd\u8bc1\u4e86\u8bed\u97f3\u6570\u636e\u7684\u53cc\u5411\u5b9e\u65f6\u4f20\u8f93\u3002\u200b<\/p>\n

          \u6838\u5fc3\u7c7b\u4ecb\u7ecd\u200b<\/h3>\n

          \u5728 Java \u7684 UDP \u7f51\u7edc\u7f16\u7a0b\u91cc，DatagramSocket\u548cDatagramPacket\u662f\u4e24\u4e2a\u5173\u952e\u7c7b，\u5206\u522b\u8d1f\u8d23 socket \u901a\u4fe1\u548c\u6570\u636e\u62a5\u7684\u5c01\u88c5\u4f20\u8f93，\u76f8\u4e92\u914d\u5408\u5b9e\u73b0 UDP \u901a\u4fe1\u529f\u80fd\u3002<\/p>\n

          UDP\u7684socket\u5e94\u8be5\u5982\u4f55\u4f7f\u7528：<\/h2>\n

          UDP\u7684API\u4e3b\u8981\u662f\u63d0\u4f9b\u4e86\u4e24\u4e2a\u7c7b：<\/p>\n

        • DatagramSocket<\/li>\n
        • DatagramPacket<\/li>\n

          1: DatagramSocket<\/h2>\n

          socket: \u672c\u8d28\u4e0a\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u6982\u5ff5，\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u6587\u4ef6 \u8fd9\u91cc\u7684socket\u5c5e\u4e8e\u5c31\u662f\u628a\u201c\u7f51\u5361\u201d\u8fd9\u4e2a\u8bbe\u5907，\u7ed9\u62bd\u8c61\u6210\u4e86\u6587\u4ef6，\u800c\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u6700\u6838\u5fc3\u7684\u786c\u4ef6\u8bbe\u5907\u5c31\u662f\u7f51\u5361<\/p>\n

          \u5f80socket\u6587\u4ef6\u4e2d\u5199\u6570\u636e，\u5c31\u76f8\u5f53\u4e8e\u662f\u901a\u8fc7\u7f51\u5361\u53d1\u9001\u6570\u636e \u5f80socket\u6587\u4ef6\u4e2d\u8bfb\u6570\u636e，\u5c31\u76f8\u5f53\u4e8e\u662f\u901a\u8fc7\u7f51\u5361\u63a5\u6536\u6570\u636e<\/p>\n

          \u4e0a\u9762\u5c31\u662f\u628a\u6587\u4ef6\u64cd\u4f5c\u548c\u7f51\u7edc\u901a\u4fe1\u7ed9\u7edf\u4e00\u4e86 \u5728Java\u4e2d\u5c31\u662f\u4f7f\u7528\u8fd9\u4e2a DatagramSocket \u7c7b\u5c31\u662f\u6765\u8868\u793a\u7cfb\u7edf\u5185\u90e8\u7684socket\u6587\u4ef6 \u8fd9\u4e2a DatagramSocket \u7c7b\u8d1f\u8d23\u6587\u4ef6\u8bfb\u5199，\u4e5f\u5c31\u662f\u501f\u52a9\u7f51\u5361\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e<\/p>\n

          2: DatagramPacket<\/h2>\n

          \u4f7f\u7528\u8fd9\u4e2a\u7c7b\u5c31\u662f\u6765\u8868\u793a\u4e00\u4e2aUDP\u6570\u636e\u62a5： UDP\u662f\u9762\u5411\u6570\u636e\u62a5\u7684 \u6bcf\u6b21\u8fdb\u884c\u4f20\u8f93，\u90fd\u8981\u4ee5UDP\u6570\u636e\u62a5\u4e3a\u57fa\u672c\u5355\u4f4d \u6bcf\u6b21\u4f20\u8f93\u90fd\u53ea\u80fd\u591f\u4f20\u8f93\u4e00\u4e2a\u5b8c\u6574\u7684\u6570\u636e\u62a5，\u4e0d\u53ef\u4ee5\u4f20\u8f93\u534a\u4e2a\u6570\u636e\u62a5，\u4e5f\u4e0d\u53ef\u4ee5\u4f20\u8f93\u4e00\u4e2a\u534a\u6570\u636e\u62a5<\/p>\n

          \u5199\u4e00\u4e2a\u7b80\u5355\u7684UDP\u7684\u5ba2\u6237\u7aef\/\u670d\u52a1\u5668\u901a\u4fe1\u7684\u7a0b\u5e8f： \u8fd9\u4e2a\u7a0b\u5e8f\u6ca1\u6709\u4ec0\u4e48\u4e1a\u52a1\u903b\u8f91，\u8bf7\u6c42\u4ec0\u4e48，\u5c31\u54cd\u5e94\u4ec0\u4e48 \u53ea\u662f\u5355\u7eaf\u6ef4\u8c03\u7528Socket API<\/p>\n

          \u8ba9\u5ba2\u6237\u7aef\u7ed9\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2a\u8bf7\u6c42，\u8bf7\u6c42\u5c31\u662f\u4e00\u4e2a\u4ece\u63a7\u5236\u53f0\u8f93\u5165\u7684\u5b57\u7b26\u4e32，\u670d\u52a1\u5668\u6536\u5230\u5b57\u7b26\u4e32\u4e4b\u540e，\u4e5f\u5c31\u4f1a\u628a\u8fd9\u4e2a\u5b57\u7b26\u4e32\u539f\u5c01\u4e0d\u52a8\u5730\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef，\u7136\u540e\u5ba2\u6237\u7aef\u518d\u663e\u793a\u51fa\u6765， \u8fd9\u4e2a\u7a0b\u5e8f\u5c31\u662f\u8bf7\u6c42\u4ec0\u4e48，\u5c31\u54cd\u5e94\u4ec0\u4e48 \u8fd9\u4e2a\u7a0b\u5e8f\u662f\u6700\u7b80\u5355\u7684\u7f51\u7edc\u901a\u4fe1\u7a0b\u5e8f，\u53eb\u505a\u56de\u663e\u670d\u52a1\u5668<\/p>\n

          \u56de\u663e\u670d\u52a1\u5668<\/h3>\n

          \u670d\u52a1\u5668\u7684\u4e3b\u8981\u529f\u80fd：<\/p>\n

          \u8d1f\u8d23\u63a5\u6536\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42，\u7136\u540e\u6839\u636e\u5b9e\u9645\u7684\u4e1a\u52a1\u573a\u666f\u6765\u8fd4\u56de\u4e0d\u540c\u7684\u54cd\u5e94<\/p>\n

          \u6709\u4e00\u79cd\u670d\u52a1\u5668\u662f\u56de\u663e\u670d\u52a1\u5668：<\/p>\n

          \u56de\u663e\u670d\u52a1\u5668\u7684\u4f5c\u7528\u5c31\u662f\u5ba2\u6237\u7aef\u53d1\u5565\u8bf7\u6c42，\u56de\u663e\u670d\u52a1\u5668\u5c31\u7acb\u9a6c\u8fd4\u56de\u5565\u8bf7\u6c42，\u6ca1\u6709\u4e1a\u52a1\u903b\u8f91\u7684<\/p>\n

          \u6bd4\u5982： \u5ba2\u6237\u7aef\u53d1\u9001\u60f3\u5403\u86cb\u7092\u996d\u7684\u8bf7\u6c42 \u670d\u52a1\u5668\u5c31\u63a5\u6536\u5230\u86cb\u7092\u996d\u7684\u8bf7\u6c42\u4e4b\u540e，\u5c31\u8fd4\u56de\u86cb\u7092\u996d\u7684\u54cd\u5e94<\/p>\n

          \u8fd9\u4e2a\u56de\u663e\u670d\u52a1\u5668\u662f\u7f51\u7edc\u7f16\u7a0b\u4e2d\u6700\u7b80\u5355\u7684\u7a0b\u5e8f，\u76f8\u5f53\u4e0e\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684\u201cHello World\u201d<\/p>\n

          \u56de\u663e\u670d\u52a1\u5668\u7684\u4f5c\u7528<\/p>\n

        • \u5b66\u4f1a\u638c\u63e1Socket API\u7684\u57fa\u672c\u4f7f\u7528<\/li>\n
        • \u5b66\u4f1a\u5178\u578b\u7684\u5ba2\u6237\u7aef\u670d\u52a1\u5668\u7684\u5de5\u4f5c\u6d41\u7a0b<\/li>\n

          \u8fdb\u884c\u7f51\u7edc\u7f16\u7a0b\u7684\u7b2c\u4e00\u6b65<\/h3>\n

          \u670d\u52a1\u5668\u7684\u4ee3\u7801(\u56de\u663e\u670d\u52a1\u5668)<\/h3>\n

          \u6211\u4eec\u5148\u6765\u5199\u4e00\u4e2a\u670d\u52a1\u5668\u4ee3\u7801：<\/p>\n

          \u521b\u5efa\u4e00\u4e2aDatagramSocket\u7684\u5bf9\u8c61：<\/h4>\n

          \u6ce8\u610f： \u8fd9\u4e2a\u5bf9\u8c61\u662f\u5728\u521b\u5efa\u5728\u5185\u5b58\u4e2d\u7684，\u76f4\u63a5\u5bf9\u5185\u5b58\u8fdb\u884c\u64cd\u4f5c\u5c31\u53ef\u4ee5\u5f71\u54cd\u5230\u7f51\u5361<\/p>\n

          \u7a0b\u5e8f\u542f\u52a8\u7684\u540c\u65f6\u8981\u5173\u8054\/\u7ed1\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7，\u8fd9\u4e2a\u7aef\u53e3\u53f7\u662f\u4e13\u95e8\u7528\u6765\u533a\u5206\u4e3b\u673a\u7684<\/p>\n

          \u4e00\u4e2a\u4e3b\u673a\u53ea\u80fd\u591f\u6709\u4e00\u4e2a\u7aef\u53e3\u53f7，\u540c\u65f6\u4e00\u4e2a\u4e3b\u673a\u4e2d\u7684\u7aef\u53e3\u53f7\u53ea\u80fd\u548c\u4e00\u4e2a\u8fdb\u7a0b\u8fdb\u884c\u7ed1\u5b9a， \u4e00\u4e2a\u7aef\u53e3\u53f7\u548c\u8fdb\u7a0bA\u8fdb\u884c\u4e86\u7ed1\u5b9a\u4e4b\u540e，\u5982\u679c\u8fdb\u7a0bB\u4e5f\u8981\u548c\u8fd9\u4e2a\u7aef\u53e3\u53f7\u8fdb\u884c\u7ed1\u5b9a，\u90a3\u4e48\u8fdb\u7a0bB\u4f1a\u7ed1\u5b9a\u5931\u8d25<\/p>\n

          \u4f46\u662f\u4e00\u4e2a\u8fdb\u7a0b\u662f\u53ef\u4ee5\u540c\u65f6\u548c\u591a\u4e2a\u7aef\u53e3\u53f7\u8fdb\u884c\u7ed1\u5b9a\u7684 \u4e3a\u4ec0\u4e48？ \u56e0\u4e3a\u6bcf\u4e00\u4e2a\u7aef\u53e3\u53f7\u5bf9\u5e94\u4e86\u4e00\u4e2aDatagramSocket\u5bf9\u8c61，\u5982\u679c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u6709\u591a\u4e2aDatagramSocket\u5bf9\u8c61\u7684\u8bdd，\u5c31\u53ef\u4ee5\u548c\u591a\u4e2a\u7aef\u53e3\u53f7\u8fdb\u884c\u7ed1\u5b9a \u5982\u4e0b\u56fe\u6240\u793a： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u540c\u65f6\u6211\u4eec\u5728\u521b\u5efaDatagramSocket\u5bf9\u8c61\u7684\u65f6\u5019\u5fc5\u987b\u8981\u624b\u52a8\u6307\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7 \u5728\u8fd0\u884c\u4e00\u4e2a\u670d\u52a1\u5668\u7a0b\u5e8f\u7684\u65f6\u5019，\u4e5f\u8981\u624b\u52a8\u6307\u5b9a\u7aef\u53e3\u53f7<\/p>\n

          DatagramSocket\u5bf9\u8c61\u7684\u4ee3\u7801\u521b\u5efa\u5982\u4e0b：<\/p>\n

          package<\/span> netWork<\/span>;<\/span> <\/p>\n

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

          public<\/span> class<\/span> Server<\/span> {<\/span>
          \n private<\/span> DatagramSocket<\/span> socket =<\/span> null<\/span>;<\/span> <\/p>\n

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

          }<\/span><\/p>\n

          \u4e0a\u8ff0\u7684\u4ee3\u7801\u629b\u51fa\u7684\u5f02\u5e38\u4e3aSocketException： \u8fd9\u4e2a\u5f02\u5e38\u662f\u5728\u521b\u5efaDatagramSocket\u5bf9\u8c61\u65f6，\u5f53\u4e3b\u673a\u7684\u7aef\u53e3\u53f7\u5df2\u7ecf\u88ab\u5176\u4ed6\u8fdb\u7a0b\u7ed1\u5b9a\u7684\u65f6\u5019\u4f1a\u629b\u51fa\u7684\u5f02\u5e38<\/p>\n

          \u5b9a\u4e49\u670d\u52a1\u5668\u542f\u52a8\u65b9\u6cd5：<\/h4>\n

          \u63a5\u4e0b\u6765\u5b9a\u4e49\u4e00\u4e2astart\u65b9\u6cd5\u6765\u4f5c\u4e3a\u670d\u52a1\u5668\u542f\u52a8\u7684\u65b9\u6cd5： start\u65b9\u6cd5\u7684\u6267\u884c\u903b\u8f91\u5982\u4e0b\u6240\u793a：<\/p>\n

          \u5728start\u65b9\u6cd5\u4e2d\u4f1a\u6709\u4e00\u4e2awhile\u5faa\u73af： \u7531\u4e8e\u670d\u52a1\u5668\u6bcf\u5929\u4ece\u5ba2\u6237\u7aef\u90a3\u91cc\u63a5\u6536\u5230\u7684\u8bf7\u6c42\u6709\u5f88\u591a， \u6240\u4ee5\u670d\u52a1\u5668\u4f1a\u6bcf\u65f6\u6bcf\u523b\u90fd\u5728\u4e0d\u505c\u5730\u8fd0\u884c，\u6bcf\u5faa\u73af\u4e00\u6b21，\u5c31\u662f\u670d\u52a1\u5668\u5728\u63a5\u6536\u5230\u8bf7\u6c42，\u8fd4\u56de\u54cd\u5e94\u7684\u8fc7\u7a0b<\/p>\n

          \u5728\u6bcf\u6b21while\u5faa\u73af\u4e2d，\u4f1a\u7ecf\u5386\u4e0b\u9762\u4e09\u4e2a\u6b65\u9aa4 ：<\/p>\n

        • \u670d\u52a1\u5668\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u8bf7\u6c42，\u89e3\u6790\u8bf7\u6c42<\/li>\n
        • \u670d\u52a1\u5668\u6839\u636e\u8bf7\u6c42\u6765\u8ba1\u7b97\u54cd\u5e94(\u56de\u663e\u670d\u52a1\u5668\u6ca1\u6709\u8fd9\u4e00\u6b65)<\/li>\n
        • \u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u54cd\u5e94 \u4ee3\u7801\u5982\u4e0b：<\/li>\n

          public<\/span> void<\/span> start<\/span>(<\/span>)<\/span>{<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u670d\u52a1\u5668\u542f\u52a8"<\/span>)<\/span>;<\/span>
          \n while<\/span>(<\/span>true<\/span>)<\/span>{<\/span>
          \n \/\/\u6bcf\u6b21\u5faa\u73af，\u90fd\u662f\u4e00\u6b21\u670d\u52a1\u5668\u5728\u63a5\u6536\u8bf7\u6c42，\u8fd4\u56de\u54cd\u5e94\u7684\u8fc7\u7a0b <\/span>
          \n \/\/1.\u8bfb\u53d6\u8bf7\u6c42，\u89e3\u6790\u8bf7\u6c42 <\/span>
          \n socket.<\/span>receive<\/span>(<\/span>)<\/span>;<\/span>
          \n \/\/2.\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94(\u56de\u663e\u670d\u52a1\u5668\u4e0d\u9700\u8981\u8fd9\u4e00\u6b65) <\/span>
          \n \/\/3. \u8fd4\u56de\u54cd\u5e94 <\/span><\/p>\n

          }<\/span>
          \n}<\/span><\/p>\n

          \u7b2c\u4e00\u6b65：\u8bfb\u53d6\u8bf7\u6c42，\u8fdb\u884c\u89e3\u6790，<\/p>\n

          socket.receive()<\/p>\n

          \u4e0a\u9762\u4ee3\u7801\u4e2d\u7684\u8fd9\u4e2areceive\u65b9\u6cd5\u4e2d\u9700\u8981\u586b\u5199\u4e00\u4e2aDatagramPacket\u7c7b\u578b\u7684\u53c2\u6570， \u8fd9\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u8f93\u51fa\u578b\u53c2\u6570，\u8fd9\u4e2a\u53c2\u6570\u5728\u6587\u4ef6IO\u4e2d\u4e5f\u6d89\u53ca\u5230\u4e86，\u5b9e\u9645\u4e0a\u5728DatagramPacket\u5185\u90e8\u5c31\u4f1a\u5305\u542b\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4，\u5982\u4e0b\u6240\u793a<\/p>\n

          DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4096<\/span>]<\/span>,<\/span> 4096<\/span>)<\/span>;<\/span><\/p>\n

          \u8fd9\u4e2a\u5b57\u7b26\u6570\u7ec4\u4f1a\u4fdd\u5b58\u6536\u5230\u7684\u6d88\u606f\u6b63\u6587,\u8fd9\u4e2a\u6d88\u606f\u6b63\u6587\u5c31\u662f\u5e94\u7528\u5c42\u6570\u636e\u5305，\u4e5f\u5c31\u662fUDP\u6570\u636e\u62a5\u8f7d\u8377\u90e8\u5206，\u8fd9\u4e2a\u8f7d\u8377\u7a7a\u95f4\u7684\u5927\u5c0f\u53ef\u4ee5\u7075\u6d3b\u8bbe\u7f6e<\/p>\n

          \u5c06\u8fd9\u4e2a\u53c2\u6570\u4f20\u5165socket.receive()\u4e2d\u540e，\u4f1a\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38：<\/p>\n

          IOException : \/\/\u7f51\u7edc\u7f16\u7a0b，\u8bfb\u5199socket\u672c\u8d28\u5c31\u662fIO<\/p>\n

          public<\/span> void<\/span> start<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u670d\u52a1\u5668\u542f\u52a8"<\/span>)<\/span>;<\/span>
          \n while<\/span>(<\/span>true<\/span>)<\/span>{<\/span>
          \n \/\/\u6bcf\u6b21\u5faa\u73af，\u90fd\u662f\u4e00\u6b21\u670d\u52a1\u5668\u5728\u63a5\u6536\u8bf7\u6c42，\u8fd4\u56de\u54cd\u5e94\u7684\u8fc7\u7a0b <\/span>
          \n \/\/1.\u8bfb\u53d6\u8bf7\u6c42，\u89e3\u6790\u8bf7\u6c42 <\/span>
          \n DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4096<\/span>]<\/span>,<\/span> 4096<\/span>)<\/span>;<\/span>
          \n socket.<\/span>receive<\/span>(<\/span>requestPacket)<\/span>;<\/span>
          \n \/\/2.\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94(\u56de\u663e\u670d\u52a1\u5668\u4e0d\u9700\u8981\u8fd9\u4e00\u6b65) <\/span>
          \n \/\/3. \u8fd4\u56de\u54cd\u5e94 <\/span>
          \n }<\/span>
          \n}<\/span><\/p>\n

          \u624b\u52a8\u521b\u5efa\u5185\u5b58\u7a7a\u95f4：<\/h4>\n

          \u5f53\u6536\u5230\u6570\u636e\u7684\u65f6\u5019，\u9700\u8981\u641e\u4e00\u4e2a\u5185\u5b58\u7a7a\u95f4\u6765\u4fdd\u5b58\u8fd9\u4e2a\u6570\u636e<\/p>\n

          \u6240\u4ee5\u4e0a\u9762\u7684requestPacket\u5bf9\u8c61\u662f\u7528\u6765\u627f\u8f7d\u4ece\u7f51\u5361\u90a3\u91cc\u8bfb\u5230\u7684\u6570\u636e<\/p>\n

          \u4f46\u662f\u7531\u4e8e\u5728DatagramPacket\u7684\u5185\u90e8\u662f\u4e0d\u53ef\u4ee5\u81ea\u884c\u5206\u914d\u5185\u5b58\u7a7a\u95f4\u7684，\u6240\u4ee5\u9700\u8981\u624b\u52a8\u628a\u5185\u5b58\u7a7a\u95f4\u521b\u5efa\u597d<\/p>\n

          \u8fd9\u91cc\u521b\u5efa\u4e86\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4，\u8fd9\u4e2a\u5b57\u8282\u6570\u7ec4\u5c31\u662f\u771f\u6b63\u7684\u7528\u6765\u627f\u8f7d\u6570\u636e\u7684\u5185\u5b58\u7a7a\u95f4 \u7136\u540e\u518d\u4ea4\u7ed9DatagramPacket\u5904\u7406：<\/p>\n

          \u4e4b\u540ereceive\u5c31\u4f1a\u4ece\u8fd9\u4e2arequestPacket\u5bf9\u8c61\u4e2d\u8bfb\u53d6\u6570\u636e，\u7136\u540e\u628a\u8bfb\u53d6\u5230\u7684\u6570\u636e\u586b\u5145\u5230socket\u5bf9\u8c61\u4e2d\u53bb<\/p>\n

          \u6b64\u5904receive\u5c31\u53ef\u4ee5\u4ece\u7f51\u5361\u4e2d\u8bfb\u53d6\u4e00\u4e2aUDP\u6570\u636e\u62a5<\/p>\n

          \u8fd9\u4e2aUDP\u6570\u636e\u62a5\u5c31\u662f\u88ab\u653e\u8fdb\u4e86requestPacket\u5bf9\u8c61\u4e2d<\/p>\n

          \u5176\u4e2dUDP\u6570\u636e\u62a5\u7684\u8f7d\u8377\u90e8\u5206\u88ab\u653e\u8fdb\u4e86requestPacket\u5185\u7f6e\u7684\u5b57\u8282\u6570\u7ec4\u4e2d，\u540c\u65f6，UDP\u7684\u62a5\u5934\u90e8\u5206\u548c\u6536\u5230\u7684\u6570\u636e\u6e90IP，\u6e90IP\u7aef\u53e3\u90fd\u4f1a\u88ab\u4fdd\u5b58\u5728 requestPacket\u7684\u5176\u4ed6\u5c5e\u6027\u4e2d<\/p>\n

          \u6240\u4ee5\u6211\u4eecrequestPacket\u8fd8\u53ef\u4ee5\u77e5\u9053\u6570\u636e\u662f\u4ece\u54ea\u91cc\u6765\u7684(\u6e90IP\u6e90\u7aef\u53e3)<\/p>\n

          \u5982\u679c\u6267\u884c\u5230receive\u7684\u65f6\u5019，\u8fd8\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8bf7\u6c42，\u90a3\u4e48\u6b64\u65f6receive\u5c31\u6ca1\u6709\u53ef\u4ee5\u8bfb\u53d6\u7684\u6570\u636e，\u6b64\u65f6receive\u5c31\u4f1a\u53d1\u751f\u963b\u585e，\u4e00\u76f4\u963b\u585e\u5230\u5ba2\u6237\u7aef\u53d1\u6765\u8bf7\u6c42\u4e3a\u6b62<\/p>\n

          \u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u8f6c\u6210\u5b57\u7b26\u4e32：<\/h4>\n

          \u6b64\u65f6\u7684receive\u4f1a\u8bfb\u53d6\u5230\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4， \u5f53receive\u8bfb\u53d6\u5b8c\u6bd5\u4e4b\u540e，\u6570\u636e\u662f\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u5b58\u50a8\u5230DatagramPacket\u4e2d<\/p>\n

          \u8981\u60f3\u80fd\u591f\u628a\u8fd9\u91cc\u7684\u6570\u636e\u7ed9\u663e\u793a\u51fa\u6765，\u5c31\u9700\u8981\u628a\u8fd9\u4e2a\u4e8c\u8fdb\u5236\u6570\u636e\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32 \u6240\u4ee5，\u6b64\u65f6\u7684\u8bfb\u7684\u5b57\u8282\u6570\u7ec4\u5fc5\u987b\u8981\u5148\u8f6c\u6210(\u5b57\u7b26\u4e32)String\u4e4b\u540e，\u624d\u65b9\u4fbf\u540e\u7eed\u7684\u903b\u8f91\u5904\u7406：<\/p>\n

          String<\/span> request =<\/span> new<\/span> String<\/span>(<\/span>requestPacket.<\/span>getData<\/span>(<\/span>)<\/span>,<\/span>0<\/span>,<\/span>requestPacket.<\/span>getLength<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

          \u57fa\u4e8e\u5b57\u8282\u6570\u7ec4\u6784\u9020String，\u5b57\u8282\u6570\u7ec4\u91cc\u9762\u4fdd\u5b58\u7684\u5185\u5bb9\u4e0d\u4e00\u5b9a\u5c31\u662f\u4e8c\u8fdb\u5236\u6570\u636e，\u4e5f\u53ef\u80fd\u662f\u6587\u672c\u6570\u636e \u800c\u5b57\u7b26\u4e32(String) \u4e0d\u4ec5\u53ef\u4ee5\u4fdd\u5b58\u4e8c\u8fdb\u5236\u6570\u636e，\u8fd8\u53ef\u4ee5\u4fdd\u5b58\u6587\u672c\u6570\u636e，\u6240\u4ee5\u9700\u8981\u5c06\u8fd9\u4e2a\u5b57\u8282\u6570\u7ec4\u8f6c\u6210\u5b57\u7b26\u4e32 :<\/p>\n

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u6ce8\u610f： \u5728getLength()\u4e2d\u83b7\u53d6\u7684\u5b57\u8282\u6570\u7ec4\u7684\u6709\u6548\u6570\u636e\u7684\u957f\u5ea6\u4e0d\u4e00\u5b9a\u5c31\u662f4096 \u8fd9\u4e2a4096\u662f\u8fd9\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u6700\u5927\u957f\u5ea6， \u800cgetLength()\u83b7\u53d6\u5230\u7684\u7ed3\u679c\u662f\u6536\u5230\u7684\u6570\u636e\u7684\u771f\u5b9e\u957f\u5ea6，\u5373\u53d1\u9001\u65b9\u8fd9\u4e00\u6b21\u5b9e\u9645\u53d1\u9001\u4e86\u591a\u5c11\u4e2a\u6570\u636e \u6bd4\u5982： \u5982\u679c\u8fd9\u4e00\u6b21\u6536\u5230\u7684\u6570\u636e\u957f\u5ea6\u662f10，\u90a3\u4e48\u8fd9\u4e2agetLength()\u83b7\u53d6\u5230\u7684\u5c31\u662f10\u3002 \u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u6784\u9020\u5b57\u7b26\u4e32\u662f\u4f7f\u7528\u6709\u6548\u6570\u636e\u957f\u5ea6\u6765\u8fdb\u884c\u6784\u9020，\u4e0d\u80fd\u4f7f\u7528\u5b57\u8282\u6570\u7ec4\u7684\u6700\u5927\u957f\u5ea6\u6765\u6784\u9020<\/p>\n

          \u4ee5\u4e0a\u5c31\u662f\u628a\u4e00\u4e2a\u8bf7\u6c42\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u4e86<\/p>\n

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u5c01\u88c5\u5206\u7528：<\/h4>\n

          \u7f51\u8def\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u6d89\u53ca\u5230"\u5c01\u88c5\u548c\u5206\u7528"：<\/p>\n

          \u53ea\u6709\u5f53\u5e94\u7528\u5c42\u8c03\u7528\u4f20\u8f93\u5c42\u63d0\u4f9b\u7684API\u7684\u65f6\u5019，\u624d\u4f1a\u628a\u8fd9\u4e2a\u6570\u636e\u7ed9\u8bfb\u53d6\u5230; \u6570\u636e\u6765\u5230\u670d\u52a1\u5668\u65f6，\u4f1a\u7ecf\u7531\u7269\u7406\u5c42，\u4e00\u5c42\u5c42\u5206\u7528\u5230\u5e94\u7528\u5c42：<\/p>\n

          \u5728\u4f20\u8f93\u5c42\u4e2d：\u4f1a\u7ed9\u6bcf\u4e00\u4e2asocket\u5bf9\u8c61\u90fd\u5206\u914d\u4e00\u4e2a\u7f13\u51b2\u533a(\u8fd9\u4e2a\u7f13\u51b2\u533a\u5728\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u91cc) \u6bcf\u6b21\u7f51\u5361\u6536\u5230\u4e00\u4e2a\u6570\u636e\u90fd\u662f\u7ecf\u7531\u5c42\u5c42\u5206\u7528，\u89e3\u6790\u597d\u4e4b\u540e，\u6700\u7ec8\u653e\u5230\u7f13\u51b2\u533a\u91cc \u5728\u5e94\u7528\u5c42\u7684\u5e94\u7528\u7a0b\u5e8f\u8c03\u7528receive\u5c31\u662f\u4ece\u8fd9\u4e2a\u7f13\u51b2\u533a\u91cc\u9762\u62ff\u8d70\u4e00\u4e2a\u6570\u636e \u8fd9\u4e2a\u672c\u8d28\u4e0a\u5c31\u662f\u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u6a21\u578b，\u800c\u6b64\u5904\u7ed9socket\u5bf9\u8c61\u5206\u914d\u7684\u7f13\u51b2\u533a\u5c31\u662f\u963b\u585e\u961f\u5217<\/p>\n

          \u6240\u4ee5\u4ece\u5ba2\u6237\u7aef\u4f20\u8fc7\u6765\u7684\u6570\u636e \u4e0d\u662f\u5b58\u5728socket\u6587\u4ef6\u4e2d，\u800c\u662f\u5b58\u5728socket\u5bf9\u8c61\u4e2d\u7684\u4e00\u4e2a\u5185\u5b58\u7f13\u51b2\u533a\u7684\u963b\u585e\u961f\u5217\u4e2d<\/p>\n

          \u7b2c\u4e8c\u6b65：\u6839\u636e\u8bf7\u6c42\u6765\u6784\u9020\u54cd\u5e94：<\/p>\n

          String<\/span> response =<\/span> process<\/span>(<\/span>request)<\/span>;<\/span><\/p>\n

          \u8fd9\u4e2a\u4ee3\u7801\u8981\u6839\u636e\u8bf7\u6c42\u6784\u9020\u54cd\u5e94，\u901a\u8fc7\u8fd9\u4e2aprocess\u65b9\u6cd5\u6765\u6784\u9020\u54cd\u5e94<\/p>\n

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

          \u7531\u4e8e\u6b64\u5904\u662f\u56de\u663e\u670d\u52a1\u5668，\u6240\u4ee5\u53ea\u9700\u8981\u5355\u7eaf\u6ef4\u8fd4\u56de\u8fd9\u4e2a\u8bf7\u6c42\u5c31\u53ef\u4ee5\u4e86<\/p>\n

          \u7b2c\u4e09\u6b65： \u628a\u54cd\u5e94\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef：<\/p>\n

          1： \u6784\u9020\u4e00\u4e2a\u54cd\u5e94\u5bf9\u8c61DatagramPacket\u4f5c\u4e3a\u54cd\u5e94\u5bf9\u8c61<\/p>\n

          \u540c\u65f6\u7531\u4e8eUDP\u662f\u65e0\u8fde\u63a5\u7684，\u6240\u4ee5UDP\u4e0d\u4f1a\u4fdd\u5b58\u8981\u53d1\u7ed9\u8c01<\/p>\n

          \u6240\u4ee5\u5c31\u9700\u8981\u5728\u6bcf\u6b21\u53d1\u9001\u7684\u65f6\u5019，\u91cd\u65b0\u6307\u5b9a，\u6570\u636e\u8981\u53d1\u9001\u5230\u54ea\u91cc\u53bb<\/p>\n

          \u6240\u4ee5\u5728\u8fd9\u4e2a\u54cd\u5e94\u5bf9\u8c61(\u6570\u636e\u62a5）\u4e2d\u9700\u8981\u6307\u5b9a\u6570\u636e\u5185\u5bb9，\u4e5f\u8981\u6307\u5b9a\u6570\u636e\u5177\u4f53\u8981\u53d1\u9001\u7ed9\u8c01\u3002<\/p>\n

          \/\/\u6784\u9020\u4e00\u4e2aDatagramPacket\u4f5c\u4e3a\u54cd\u5e94\u5bf9\u8c61 <\/span>
          \nDatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>response.<\/span>getBytes<\/span>(<\/span>StandardCharsets<\/span>.<\/span>UTF_8)<\/span>,<\/span>
          \nresponse.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length)<\/span>;<\/span><\/p>\n

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u521a\u521a\u7684socket\u5bf9\u8c61\u8fd8\u6ca1\u6709\u6784\u9020\u5b8c\u6bd5，\u5728\u6784\u9020\u65f6\u8fd8\u9700\u8981\u6307\u5b9a\u4e00\u4e2asocketAddress\u8fdb\u53bb：<\/p>\n

          DatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>response.<\/span>getBytes<\/span>(<\/span>StandardCharsets<\/span>.<\/span>UTF_8)<\/span>,<\/span>
          \nresponse.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length,<\/span>requestPacket.<\/span>getAddress<\/span>(<\/span>)<\/span>,<\/span>requestPacket.<\/span>getPort<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

          \u8fd9\u4e2arequestPacket.getAddress()\u548crequestPacket.getPort() \u65b9\u6cd5\u4f1a\u83b7\u53d6\u5230\u4e00\u4e2aIP\u548c\u4e00\u4e2a\u7aef\u53e3\u53f7<\/p>\n

          \u8fd9\u4e2aIP\u548c\u7aef\u53e3\u53f7\u662f\u548c\u670d\u52a1\u5668\u901a\u4fe1\u7684\u5bf9\u7aef\u7684\u5ba2\u6237\u7aef\u7684IP\u548c \u7aef\u53e3\u53f7 \u8fd9\u4e2aIP\u548c\u7aef\u53e3\u53f7\u662f\u4ece\u8fd9\u4e2arequestPacket\u8fd9\u4e2a\u5ba2\u6237\u7aef\u6570\u636e\u5305\u4e2d\u83b7\u53d6\u7684<\/p>\n

          \u540c\u65f6\u5728\u4ee3\u7801\u4e2d\u7684response.getBytes().length\u83b7\u53d6\u5230\u7684\u662f\u5b57\u8282<\/p>\n

          \u5728\u8fdb\u884c\u7f51\u7edc\u4f20\u8f93\u7684\u65f6\u5019，\u4e00\u5b9a\u662f\u4f7f\u7528\u5b57\u8282\u6765\u8fdb\u884c\u4f20\u8f93\u7684<\/p>\n

          \u800cresponse.length() \u83b7\u53d6\u5230\u7684\u662f\u5b57\u7b26，\u5982\u679c\u5168\u662f\u82f1\u6587，\u90a3\u4e48\u5b57\u8282\u548c\u5b57\u7b26\u7684\u4e2a\u6570\u4e00\u6837，\u4f46\u662f\u5982\u679c\u6709\u4e2d\u6587，\u90a3\u4e48\u6b64\u65f6\u5b57\u8282\u548c\u5b57\u7b26\u7684\u4e2a\u6570\u5c31\u4e0d\u4e00\u6837\u4e86\u3002<\/p>\n

          \u4e3a\u4ec0\u4e48\u8981\u83b7\u53d6\u5230\u8fd9\u4e2a\u5ba2\u6237\u7aef\u7684IP\u548c\u7aef\u53e3\u53f7？<\/p>\n

          \u8fd9\u91cc\u662f\u628a\u5ba2\u6237\u7aef(\u8bf7\u6c42)\u4e2d\u7684\u6e90IP\u548c\u6e90\u7aef\u53e3，\u4f5c\u4e3a\u54cd\u5e94\u7684\u76ee\u7684IP\u548c\u76ee\u7684\u7aef\u53e3 \u6b64\u65f6\u5c31\u53ef\u4ee5\u505a\u5230\u628a\u6d88\u606f\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u6548\u679c\u4e86<\/p>\n

          \u6b64\u65f6\u6211\u4eec\u7684\u54cd\u5e94\u5bf9\u8c61\u5c31\u6784\u9020\u597d\u4e86，\u53ea\u9700\u8981\u5c06\u8fd9\u4e2aresponsePacket\u4f5c\u4e3a\u53c2\u6570\u4f7f\u7528send\u65b9\u6cd5\u4f20\u9012\u51fa\u53bb\u5373\u53ef：<\/p>\n

          socket.send(responsePacket);<\/p>\n

          \u4e0a\u8ff0\u4ee3\u7801\u4e2d，\u53ef\u4ee5\u770b\u5230UDP \u662f\u65e0\u8fde\u63a5\u901a\u4fe1，UDP socket\u81ea\u8eab\u4e0d\u4fdd\u5b58\u5bf9\u7aef(\u5ba2\u6237\u7aef)\u7684IP\u548c\u7aef\u53e3\u53f7 :<\/p>\n

          \u8fd9\u4e2aIP\u548c\u7aef\u53e3\u53f7\u662f\u5728\u6570\u636e\u5305\u4e2d\u6709\u4e00\u4e2a，\u540c\u65f6\u5728\u4ee3\u7801\u4e2d\u4e5f\u6ca1\u6709"\u5efa\u7acb\u8fde\u63a5"\u548c"\u63a5\u53d7\u8fde\u63a5"\u7684\u64cd\u4f5c<\/p>\n

          \u8fd9\u4e2a\u662f\u76f4\u63a5\u8bfb\u53d6\u8bf7\u6c42，\u82e5\u6ca1\u6709\u8bf7\u6c42，\u5219\u963b\u585e\u7b49\u5f85，\u82e5\u6709\u8bf7\u6c42，\u5219\u5bf9\u8bf7\u6c42\u8fdb\u884c\u89e3\u6790，\u7136\u540e\u6839\u636e\u8bf7\u6c42\u6784\u9020\u54cd\u5e94，\u6700\u540e\u8fd4\u56de\u54cd\u5e94<\/p>\n

          \u6240\u8c13\u7684UDP\u4e0d\u53ef\u9760\u4f20\u8f93\u76ee\u524d\u4ee3\u7801\u4e2d\u6ca1\u6709\u4f53\u73b0:<\/p>\n

          \u800cUDP\u7684\u9762\u5411\u6570\u636e\u62a5\u6709\u4f53\u73b0： \u4e0a\u8ff0\u4ee3\u7801\u4e2d\u7684send\u548creceive\u7684\u53c2\u6570\u63a5\u6536\u90fd\u662f\u4ee5DatagramPacket\u4e3a\u5355\u4f4d\u8fdb\u884c\u53d1\u9001\u548c\u63a5\u6536\u7684<\/p>\n

          UDP\u7684\u5168\u53cc\u5de5\u5728\u4ee3\u7801\u4e2d\u4e5f\u6709\u4f53\u73b0： \u4e00\u4e2asocket\u65e2\u53ef\u4ee5\u53d1\u9001\u53c8\u53ef\u4ee5\u63a5\u6536，\u5c31\u53eb\u505a\u5168\u53cc\u5de5<\/p>\n

          \u6700\u540e\u5728\u4ee3\u7801\u4e2d\u8fdb\u884c\u4e00\u4e2a\u6253\u5370\u65e5\u5fd7\u7684\u64cd\u4f5c：<\/p>\n

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

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u4e4b\u540e\u64b0\u5199\u4e00\u4e2amain\u65b9\u6cd5\u5373\u53ef：<\/p>\n

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

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u4e0a\u8ff0\u670d\u52a1\u5668\u7684\u4ee3\u7801\u7f16\u5199\u5b8c\u6bd5，<\/p>\n

          \u4e0b\u9762\u662f\u56de\u663e\u670d\u52a1\u5668\u7684\u5b8c\u6574\u4ee3\u7801：<\/p>\n

          package<\/span> netWork<\/span>;<\/span> <\/p>\n

          import<\/span> javax.<\/span>xml.<\/span>crypto.<\/span><\/span>Data<\/span>;<\/span>
          \nimport<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span>;<\/span>
          \nimport<\/span> java.<\/span>net.<\/span><\/span>*<\/span>;<\/span>
          \nimport<\/span> java.<\/span>sql.<\/span><\/span>SQLOutput<\/span>;<\/span> <\/p>\n

          public<\/span> class<\/span> UdpServer<\/span> {<\/span>
          \n \/\/\u521b\u5efa\u4e00\u4e2aDatagramSocket\u5bf9\u8c61，\u662f\u540e\u7eed\u8fdb\u884c\u7f51\u5361\u7684\u57fa\u7840 <\/span>
          \n private<\/span> DatagramSocket<\/span> socket =<\/span> null<\/span>;<\/span> <\/p>\n

          public<\/span> UdpServer<\/span>(<\/span>int<\/span> port)<\/span> throws<\/span> SocketException<\/span>{<\/span>
          \n \/\/\u4e0b\u9762\u662f\u624b\u52a8\u6307\u5b9a\u7aef\u53e3 <\/span>
          \n socket =<\/span> new<\/span> DatagramSocket<\/span>(<\/span>port)<\/span>;<\/span> <\/p>\n

          \/\/\u4e0b\u9762\u8fd9\u4e48\u5199\u5c31\u662f\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u7aef\u53e3 <\/span>
          \n \/\/socket = new DatagramSocket(); <\/span>
          \n }<\/span> <\/p>\n

          \/\/\u7a0b\u5e8f\u7684\u4e3b\u65b9\u6cd5,\u901a\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\u6765\u542f\u52a8\u670d\u52a1\u5668 <\/span>
          \n public<\/span> void<\/span> start<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u670d\u52a1\u5668\u542f\u52a8"<\/span>)<\/span>;<\/span>
          \n \/\/\u4e00\u4e2a\u670d\u52a1\u5668\u8981\u4e0d\u505c\u6ef4\u8fd0\u884c，\u6240\u4ee5\u9700\u8981\u4e00\u4e2awhile\u5faa\u73af\u6765\u8fdb\u884c\u64cd\u4f5c,\u4e00\u4e2a\u670d\u52a1\u5668\u7a0b\u5e8f\u662f\u8981\u957f\u65f6\u95f4\u8fd0\u884c\u7684 <\/span>
          \n \/\/\u4e3a\u4e86\u4fdd\u8bc1\u5ba2\u6237\u7aef\u968f\u65f6\u6765，\u968f\u65f6\u53ef\u4ee5\u54cd\u5e94， <\/span>
          \n while<\/span>(<\/span>true<\/span>)<\/span>{<\/span>
          \n \/\/1.\u7b2c\u4e00\u6b65，\u8bfb\u53d6\u8bf7\u6c42\u5e76\u89e3\u6790 <\/span>
          \n DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4090<\/span>]<\/span>,<\/span>4090<\/span>)<\/span>;<\/span>
          \n socket.<\/span>receive<\/span>(<\/span>requestPacket)<\/span>;<\/span>
          \n \/\/\u5c06\u8bf7\u6c42\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32 <\/span>
          \n String<\/span> request =<\/span> new<\/span> String<\/span>(<\/span>requestPacket.<\/span>getData<\/span>(<\/span>)<\/span>,<\/span>0<\/span>,<\/span>requestPacket.<\/span>getLength<\/span>(<\/span>)<\/span>)<\/span>;<\/span> <\/p>\n

          \/\/2.\u6839\u636e\u8bf7\u6c42\u8ba1\u7b97\u54cd\u5e94 <\/span>
          \n \/\/\u8fd9\u4e2a\u6b65\u9aa4\u662f\u670d\u52a1\u5668\u6700\u6838\u5fc3\u7684\u4e00\u4e2a\u6b65\u9aa4, <\/span>
          \n String<\/span> response =<\/span> process<\/span>(<\/span>request)<\/span>;<\/span> <\/p>\n

          \/\/3. \u628a\u54cd\u5e94\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef <\/span>
          \n \/\/\u4f7f\u7528\u4e00\u4e2a\u54cd\u5e94\u5bf9\u8c61 DatagramPacket \u5f80\u54cd\u5e94\u5bf9\u8c61\u4e2d\u6784\u9020\u521a\u624d\u7684\u6570\u636e，\u518d\u901a\u8fc7send\u8fd4\u56de <\/span>
          \n DatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>response.<\/span>getBytes<\/span>(<\/span>)<\/span>,<\/span>response.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length,<\/span>
          \n requestPacket.<\/span>getSocketAddress<\/span>(<\/span>)<\/span>)<\/span>;<\/span> <\/p>\n

          \/\/\u4f7f\u7528send\u65b9\u6cd5\u4f20\u5165\u53c2\u6570\u8fdb\u884c\u53d1\u9001<\/span>
          \nsocket.<\/span>send<\/span>(<\/span>responsePacket)<\/span>;<\/span><\/p>\n

          System<\/span>.<\/span>out.<\/span>printf<\/span>(<\/span>"[%s:%d] req = %s,resp = %s\\\\n"<\/span>,<\/span>requestPacket.<\/span>getAddress<\/span>(<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>,<\/span>
          \n requestPacket.<\/span>getPort<\/span>(<\/span>)<\/span>,<\/span>request,<\/span>response)<\/span>;<\/span> <\/p>\n

          }<\/span>
          \n }<\/span> <\/p>\n

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

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

          \u4e3a\u4ec0\u4e48\u4e0a\u8ff0\u7684\u4ee3\u7801\u4e2d\u6ca1\u6709\u51fa\u73b0close()? socket\u4e5f\u662f\u4e00\u4e2a\u6587\u4ef6，\u4e0d\u8fdb\u884c\u5173\u95ed\u7684\u8bdd，\u4f1a\u9020\u6210\u6587\u4ef6\u8d44\u6e90\u6cc4\u9732<\/p>\n

          \u4ec0\u4e48\u662f\u6587\u4ef6\u8d44\u6e90\u6cc4\u9732？ \u4f60\u4e00\u76f4\u7533\u8bf7，\u4f46\u662f\u4e00\u76f4\u90fd\u6ca1\u6709\u8fdb\u884cclose，\u6ca1\u6709\u8fdb\u884c\u91ca\u653e，\u7ed3\u679c\u5230\u6700\u540e，\u4f60\u60f3\u7528\u7684\u65f6\u5019，\u53d1\u73b0\u7528\u4e0d\u4e86\u4e86，\u5c31\u662f\u6587\u4ef6\u8d44\u6e90\u6cc4\u9732\u3002<\/p>\n

          \u4e3a\u4ec0\u4e48\u8fd9\u91cc\u4e0d\u5199close()\u65b9\u6cd5，\u4e5f\u4e0d\u4f1a\u51fa\u73b0\u6587\u4ef6\u8d44\u6e90\u6cc4\u9732\u5462？ \u56e0\u4e3asocket\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e2d\u7684\u4e00\u4e2a\u8868\u9879.<\/p>\n

          \u6bcf\u6b21\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6，\u5c31\u4f1a\u5360\u7528\u4e00\u4e2a\u4f4d\u7f6e，\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5728PCB(\u8fdb\u7a0b)\u4e0a\u7684，\u662f\u8ddf\u968f\u8fdb\u7a0b\u7684 \u8fd9\u4e2asocket\u5728\u6574\u4e2a\u7a0b\u5e8f\u8fc7\u7a0b\u4e2d\u4e00\u76f4\u90fd\u5728\u4f7f\u7528，\u4e0d\u53ef\u4ee5\u63d0\u524d\u91ca\u653e，\u4e0d\u53ef\u4ee5\u63d0\u524d\u5173\u95ed<\/p>\n

          \u5f53socket\u4e0d\u4f7f\u7528\u7684\u65f6\u5019，\u6b64\u65f6\u6574\u4e2a\u7a0b\u5e8f\u4e5f\u8981\u7ed3\u675f\u4e86 \u5f53\u8fdb\u7a0b\u7ed3\u675f\u65f6，\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e5f\u4f1a\u8ddf\u968f\u7740\u8fdb\u7a0b\u7684\u7ed3\u675f\u88ab\u9500\u6bc1，\u5c31\u53ef\u80fd\u53d1\u751f\u6cc4\u9732\u95ee\u9898\u4e86\u3002<\/p>\n

          \u603b\u7ed3：<\/p>\n

          \u4e0d\u4f1a\u6cc4\u9732\u7684\u539f\u56e0\u662f\u56e0\u4e3asocket\u4f1a\u968f\u7740\u8fdb\u7a0b\u9500\u6bc1\u7684\u8fc7\u7a0b\u4e2d，\u88ab\u7cfb\u7edf\u81ea\u52a8\u56de\u6536\u4e86<\/p>\n

          \u4ec0\u4e48\u65f6\u5019\u4f1a\u51fa\u73b0\u6cc4\u9732？<\/p>\n

          \u4ee3\u7801\u4e2d\u9891\u7e41\u5730\u6253\u5f00\u6587\u4ef6，\u4f46\u662f\u4e0d\u5173\u95ed，\u5728\u4e00\u4e2a\u8fdb\u7a0b\u7684\u8fd0\u884c\u8fc7\u7a0b\u4e2d，\u4e0d\u65ad\u79ef\u7d2f\u6253\u5f00\u7684\u6587\u4ef6，\u9010\u6e10\u6d88\u8017\u6389\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u91cc\u7684\u5185\u5bb9，\u6700\u540e\u5185\u5bb9\u4f1a\u88ab\u6d88\u8017\u5149，\u5c31\u51fa\u73b0\u4e86\u6cc4\u9732<\/p>\n

          \u4f46\u662f\u5982\u679c\u8fdb\u7a0b\u7684\u751f\u547d\u5468\u671f\u5f88\u77ed，\u6253\u5f00\u4e00\u4e0b\u5c31\u5173\u95ed\u4e86，\u4e5f\u5c31\u4e0d\u4f1a\u51fa\u73b0\u6cc4\u9732\u4e86 \u6240\u4ee5\u6587\u4ef6\u8d44\u6e90\u6cc4\u9732\u7684\u95ee\u9898\u5728\u670d\u52a1\u5668\u4e0a\u7ecf\u5e38\u51fa\u73b0，\u56e0\u4e3a\u670d\u52a1\u5668\u7684\u8fdb\u7a0b\u751f\u547d\u5468\u671f\u5f88\u957f，\u8981\u4e00\u76f4\u8fd0\u884c \u6cc4\u9732\u7684\u95ee\u9898\u5728\u5ba2\u6237\u7aef\u4e0a\u5f88\u5c11\u51fa\u73b0，\u56e0\u4e3a\u5ba2\u6237\u7aef\u7684\u8fdb\u7a0b\u7684\u751f\u547d\u5468\u671f\u5f88\u77ed，\u5ba2\u6237\u7aef\u6253\u5f00\u4e4b\u540e\u7528\u4e00\u4e0b\u5c31\u76f4\u63a5\u5173\u95ed\u4e86<\/p>\n

          \u5ba2\u6237\u7aef\u7684\u4ee3\u7801：<\/h3>\n

          \u63a5\u4e0b\u6765\u6211\u4eec\u53bb \u7f16\u5199\u5ba2\u6237\u7aef\u7684\u4ee3\u7801：<\/p>\n

          \u6ce8\u610f：\u670d\u52a1\u5668\u9700\u8981\u624b\u52a8\u6307\u5b9a\u7aef\u53e3\u53f7 \u4f46\u662f\u5ba2\u6237\u7aef\u4e0d\u9700\u8981\u624b\u52a8\u6307\u5b9a\u7aef\u53e3\u53f7，\u4e0d\u624b\u52a8\u6307\u5b9a\u4e5f\u6709\u7aef\u53e3\u53f7， \u56e0\u4e3a\u7cfb\u7edf\u4f1a\u81ea\u52a8\u7ed9\u5ba2\u6237\u7aef\u5206\u914d\u4e00\u4e2a\u7a7a\u95f2\u7684\u7aef\u53e3\u53f7<\/p>\n

          \u4e3a\u4ec0\u4e48\u670d\u52a1\u5668\u5fc5\u987b\u8981\u81ea\u5df1\u624b\u52a8\u6307\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7？ \u56e0\u4e3a\u670d\u52a1\u5668\u8981\u4fdd\u8bc1\u7aef\u53e3\u53f7\u662f\u56fa\u5b9a\u4e0d\u53d8\u7684<\/p>\n

          \u56e0\u4e3a\u53ea\u6709\u5728\u670d\u52a1\u5668\u4ee3\u7801\u4e2d\u624b\u52a8\u6307\u5b9a\u4e00\u4e2a\u7aef\u53e3\u53f7<\/p>\n

          \u624d\u80fd\u4fdd\u8bc1\u7aef\u53e3\u59cb\u7ec8\u662f\u56fa\u5b9a\u7684，\u5982\u679c\u4e0d\u624b\u52a8\u6307\u5b9a，\u670d\u52a1\u5668\u4f9d\u8d56\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u7aef\u53e3\u53f7，\u5c31\u4f1a\u5bfc\u81f4\u670d\u52a1\u5668\u6bcf\u6b21\u5f00\u673a\u91cd\u542f\u540e，\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u7684\u7aef\u53e3\u53f7\u5c31\u53d1\u751f\u4e86\u6539\u53d8 \u3002<\/p>\n

          \u5982\u679c\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\u53d1\u751f\u4e86\u6539\u53d8，\u90a3\u4e48\u5ba2\u6237\u7aef\u5c31\u53ef\u80fd\u4f1a\u627e\u4e0d\u5230\u8fd9\u4e2a\u670d\u52a1\u5668\u5728\u54ea\u91cc\u4e86，\u6240\u4ee5\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\u5fc5\u987b\u8981\u5728\u4ee3\u7801\u4e2d\u624b\u52a8\u6307\u5b9a<\/p>\n

          \u90a3\u4e48\u4e3a\u4ec0\u4e48\u5ba2\u6237\u7aef\u4e2d\u7684\u7aef\u53e3\u53f7\u4e0d\u9700\u8981\u624b\u52a8\u6307\u5b9a， \u53ef\u4ee5\u901a\u8fc7\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u5462？<\/p>\n

          \u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53f7\u8ba9\u7cfb\u7edf\u968f\u673a\u5206\u914d，\u7cfb\u7edf\u4f1a\u53bb\u5206\u914d\u7ed9\u5ba2\u6237\u7aef\u4e00\u4e2a\u7a7a\u95f4\u4e2d\u53ef\u7528\u7684\u7aef\u53e3\u53f7 \u5982\u679c\u662f\u624b\u52a8\u6307\u5b9a\u7aef\u53e3\u53f7，\u90a3\u4e48\u5c31\u65e0\u6cd5\u786e\u5b9a\u8fd9\u4e2a\u7aef\u53e3\u53f7\u662f\u4e0d\u662f\u53ef\u63a7\u7684，\u6709\u6ca1\u6709\u88ab\u522b\u7684\u8fdb\u7a0b\u5360\u7528<\/p>\n

          \u4e3a\u4ec0\u4e48\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\u5c31\u4e0d\u6015\u88ab\u522b\u7684\u8fdb\u7a0b\u5360\u7528\u5462？<\/p>\n

          \u56e0\u4e3a\u670d\u52a1\u5668\u8fd9\u4e2a\u673a\u5668\u662f\u5728\u7a0b\u5e8f\u5458\u624b\u4e2d\u7684，\u7a0b\u5e8f\u5458\u5bf9\u4e8e\u670d\u52a1\u5668\u4e0a\u6709\u54ea\u4e9b\u7aef\u53e3\u53f7\u662f\u53ef\u7528\u7684\u4e00\u6e05\u4e8c\u695a<\/p>\n

          \u4f46\u662f\u5ba2\u6237\u7aef\u662f\u5728\u7528\u6237\u624b\u4e2d\u7684，\u6709\u5343\u5343\u4e07\u4e07\u4e2a\u7528\u6237，\u4e0a\u9762\u7684\u73af\u5883\u4e5f\u5343\u5dee\u4e07\u522b，\u7a0b\u5e8f\u5458\u65e0\u6cd5\u5f97\u77e5\u7aef\u53e3\u53f7\u662f\u5426\u88ab\u5360\u7528，\u5982\u679c\u5f3a\u884c\u624b\u52a8\u6307\u5b9a\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53f7\u5c31\u4f1a\u5bfc\u81f4\u7aef\u53e3\u7ed1\u5b9a\u5931\u8d25.<\/p>\n

          \u6240\u4ee5\u7a0b\u5e8f\u5458\u624b\u4e2d\u7684\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\u662f\u53ef\u4ee5\u624b\u52a8\u6307\u5b9a\u7684，\u4f46\u662f\u5728\u7528\u6237\u624b\u4e2d\u7684\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u53f7\u662f\u4e0d\u80fd\u624b\u52a8\u6307\u5b9a\u7684，\u53ea\u80fd\u9760\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u4e00\u4e2a\u7a7a\u95f2\u7684\u7aef\u53e3\u53f7<\/p>\n

          \u5728\u6784\u9020\u65b9\u6cd5\u4e2d，\u7531\u4e8eUDP\u81ea\u8eab\u4e0d\u4f1a\u4fdd\u5b58\u5bf9\u7aef\u7684\u4fe1\u606f，\u6240\u4ee5\u5c31\u9700\u8981\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d，\u628a\u5bf9\u7aef\u7684\u60c5\u51b5\u7ed9\u8bb0\u5f55\u4e0b\u6765，\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u4e3b\u8981\u8bb0\u5f55\u7684\u5c31\u662f\u5bf9\u7aef\u7684IP\u548c\u7aef\u53e3，\u4e5f\u5c31\u662f\u76ee\u7684IP\u548c\u76ee\u7684\u7aef\u53e3：<\/p>\n

          public<\/span> class<\/span> Client<\/span> {<\/span>
          \n \/\/\u9996\u5148\u8981\u521b\u5efasocket\u5bf9\u8c61，\u4f46\u662f\u6b64\u5904\u4e0d\u9700\u8981\u624b\u52a8\u6307\u5b9a\u7aef\u53e3\u53f7 <\/span>
          \n DatagramSocket<\/span> socket =<\/span> null<\/span>;<\/span> <\/p>\n

          \/\/\u6784\u9020\u65b9\u6cd5：\u8981\u4f20\u8f93\u670d\u52a1\u5668IP(\u76ee\u7684IP)\u548c\u670d\u52a1\u5668\u7aef\u53e3(\u76ee\u7684\u7aef\u53e3) <\/span>
          \n public<\/span> Client<\/span>(<\/span>String<\/span> serverIp,<\/span> int<\/span> serverPort)<\/span> throws<\/span> SocketException<\/span> {<\/span>
          \n socket =<\/span> new<\/span> DatagramSocket<\/span>(<\/span>)<\/span>;<\/span>
          \n }<\/span>
          \n}<\/span><\/p>\n

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u63a5\u4e0b\u6765\u521b\u5efastart\u65b9\u6cd5\u6765\u542f\u52a8\u5ba2\u6237\u7aef： \u5728\u8fd9\u4e2astart\u65b9\u6cd5\u4e2d，\u4f9d\u7136\u662f\u4f7f\u7528\u4e00\u4e2a\u5faa\u73af\u6765\u4e0d\u505c\u6ef4\u53d1\u9001\u8bf7\u6c42： \u5728\u5faa\u73af\u4e2d\u4e00\u5171\u8981\u505a\u56db\u4ef6\u4e8b\u60c5：<\/p>\n

        • \u4ece\u63a7\u5236\u53f0\u4e2d\u8bfb\u53d6\u8bf7\u6c42\u6570\u636e<\/li>\n
        • \u6784\u9020\u8bf7\u6c42\u5e76\u53d1\u9001<\/li>\n
        • \u8bfb\u53d6\u670d\u52a1\u5668\u7684\u54cd\u5e94<\/li>\n
        • \u628a\u54cd\u5e94\u663e\u793a\u5230\u63a7\u5236\u53f0\u4e0a<\/li>\n

          public<\/span> void<\/span> start<\/span>(<\/span>)<\/span>{<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u5ba2\u6237\u7aef\u542f\u52a8"<\/span>)<\/span>;<\/span>
          \n Scanner<\/span> scanner =<\/span> new<\/span> Scanner<\/span>(<\/span>System<\/span>.<\/span>in)<\/span>;<\/span>
          \n while<\/span>(<\/span>true<\/span>)<\/span>{<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"-> "<\/span>)<\/span>;<\/span>
          \n \/\/1. \u4ece\u63a7\u5236\u53f0\u4e2d\u8bfb\u53d6\u8bf7\u6c42\u6570\u636e <\/span>
          \n \/\/2. \u6784\u9020\u8bf7\u6c42\u5e76\u53d1\u9001 <\/span>
          \n \/\/3. \u8bfb\u53d6\u670d\u52a1\u5668\u7684\u54cd\u5e94 <\/span>
          \n \/\/4. \u628a\u54cd\u5e94\u663e\u793a\u5230\u63a7\u5236\u53f0\u4e0a <\/span>
          \n }<\/span>
          \n}<\/span><\/p>\n

          \u7b2c\u4e00\u6b65： \u4ece\u63a7\u5236\u53f0\u4e2d\u8bfb\u53d6\u6570\u636e，\u4f5c\u4e3a\u8bf7\u6c42：<\/p>\n

          String<\/span> request =<\/span> scanner.<\/span>next<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

          \u8fd9\u91cc\u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u8bf7\u6c42，\u4f7f\u7528scanner\u8bfb\u53d6\u5b57\u7b26\u4e32，\u6700\u597d\u4f7f\u7528next\u6765\u8bfb\u53d6，\u800c\u4e0d\u662f\u4f7f\u7528nextLine<\/p>\n

          \u56e0\u4e3a\u5982\u679c\u4f7f\u7528nextLine\u8bfb\u53d6，\u53ef\u80fd\u4f1a\u8bfb\u53d6\u4e0d\u5230\u7a7a\u683c<\/p>\n

          nextLine\u9047\u5230\u7a7a\u683c\u5c31\u81ea\u52a8\u4f5c\u4e3a\u5206\u9694\u7b26\u4e86，\u6240\u4ee5\u9700\u8981\u624b\u52a8\u8f93\u5165\u6362\u884c\u7b26<\/p>\n

          \u4f7f\u7528enter\u6765\u63a7\u5236，\u7531\u4e8eenter\u952e\u4e0d\u4ec5\u4ec5\u4f1a\u4ea7\u751f\\\\n，\u8fd8\u4f1a\u4ea7\u751f\u5176\u4ed6\u7684\u5b57\u7b26，\u5c31\u4f1a\u5bfc\u81f4\u5f53\u524d\u7684\u8fd9\u4e2a\u8bfb\u53d6\u5230\u7684\u5185\u5bb9\u4f1a\u51fa\u95ee\u9898<\/p>\n

          \u800c\u4f7f\u7528next\u5176\u5b9e\u662f\u4ee5\u201c\u7a7a\u767d\u7b26\u201d\u4f5c\u4e3a\u5206\u9694\u7b26，\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e\u6362\u884c，\u56de\u8f66，\u7a7a\u683c，\u5236\u8868\u7b26，\u5782\u76f4\u5236\u8868\u7b26<\/p>\n

          \u603b\u7ed3：<\/p>\n

          \u5982\u679c\u4ece\u63a7\u5236\u53f0\u8bfb\u53d6\u5185\u5bb9，\u5c31\u4f7f\u7528next() \u5982\u679c\u662f\u4ece\u6587\u4ef6\u8bfb\u53d6\u5185\u5bb9，\u90a3\u4e48\u4f7f\u7528next()\u548cnextLine()\u90fd\u53ef\u4ee5<\/p>\n

          \u7b2c\u4e8c\u6b65： \u628a\u8bf7\u6c42\u7684\u5185\u5bb9\u6784\u9020\u6210\u4e00\u4e2aDatagramPacket\u5bf9\u8c61，\u5728\u5bf9\u8c61\u4e2d\u4fdd\u5b58\u6570\u636e，\u957f\u5ea6， \u76ee\u7684IP\u548c\u76ee\u7684\u7aef\u53e3：<\/p>\n

          DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>request.<\/span>getBytes<\/span>(<\/span>)<\/span>,<\/span>
          \n request.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length,<\/span> InetAddress<\/span>.<\/span>getByName<\/span>(<\/span>serverIp)<\/span>,<\/span>serverPort)<\/span>;<\/span><\/p>\n

          \u7136\u540e\u5c06\u8fd9\u4e2a\u5bf9\u8c61\u53d1\u7ed9\u670d\u52a1\u5668：<\/p>\n

          socket.<\/span>send<\/span>(<\/span>requestPacket)<\/span>;<\/span><\/p>\n

          OK，\u6b64\u65f6\u5ba2\u6237\u7aef\u5df2\u7ecf\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e86\u8bf7\u6c42，\u90a3\u4e48\u63a5\u4e0b\u6765\u5c31\u53ea\u9700\u8981\u53bb\u8bfb\u53d6\u670d\u52a1\u5668\u8fd4\u56de\u7684\u54cd\u5e94\u5373\u53ef：<\/p>\n

          \u7b2c\u4e09\u6b65： \u5c1d\u8bd5\u8bfb\u53d6\u670d\u52a1\u5668\u8fd4\u56de\u7684\u54cd\u5e94： \u6b64\u65f6\u6211\u4eec\u4e5f\u662f\u9700\u8981\u5148\u6784\u9020\u4e00\u4e2a\u7a7a\u7684DatagramPacket\u5bf9\u8c61\u6765\u63a5\u6536\u54cd\u5e94\u7684\u6570\u636e：<\/p>\n

          DatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4096<\/span>]<\/span>,<\/span>4096<\/span>)<\/span>;<\/span><\/p>\n

          \u63a5\u4e0b\u6765\u4f7f\u7528\u8fd9\u4e2aresponsePacket\u5bf9\u8c61\u5bf9\u54cd\u5e94\u8fdb\u884c\u63a5\u6536\u5373\u53ef：<\/p>\n

          socket.<\/span>receive<\/span>(<\/span>responsePacket)<\/span>;<\/span><\/p>\n

          \u7b2c\u56db\u6b65： \u628a\u54cd\u5e94\u8f6c\u6362\u6210\u5b57\u7b26\u4e32，\u5e76\u663e\u793a\u51fa\u6765：<\/p>\n

          \/\/4. \u628a\u54cd\u5e94\u8f6c\u5316\u6210\u5b57\u7b26\u4e32，\u5e76\u663e\u793a\u5230\u63a7\u5236\u53f0\u4e0a <\/span>
          \nString<\/span> response =<\/span> new<\/span> String<\/span>(<\/span>responsePacket.<\/span>getData<\/span>(<\/span>)<\/span>,<\/span>0<\/span>,<\/span>responsePacket.<\/span>getLength<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
          \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>response)<\/span>;<\/span><\/p>\n

          \u4e0a\u8ff0\u7684start\u65b9\u6cd5\u5c31\u7ed3\u675f\u4e86，\u6700\u540e\u518d\u8865\u4e0a\u4e00\u4e2amain\u65b9\u6cd5\u5373\u53ef：<\/p>\n

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

          \u7efc\u4e0a\u6240\u8ff0：\u5ba2\u6237\u7aef\u7684\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\u6240\u793a：<\/p>\n

          package<\/span> netWork<\/span>;<\/span> <\/p>\n

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

          public<\/span> class<\/span> Client<\/span> {<\/span>
          \n \/\/\u9996\u5148\u8981\u521b\u5efasocket\u5bf9\u8c61，\u4f46\u662f\u6b64\u5904\u4e0d\u9700\u8981\u624b\u52a8\u6307\u5b9a\u7aef\u53e3\u53f7 <\/span>
          \n DatagramSocket<\/span> socket =<\/span> null<\/span>;<\/span> <\/p>\n

          private<\/span> String<\/span> serverIp;<\/span>
          \n private<\/span> int<\/span> serverPort;<\/span> <\/p>\n

          \/\/\u6784\u9020\u65b9\u6cd5：\u8981\u4f20\u8f93\u670d\u52a1\u5668IP(\u76ee\u7684IP)\u548c\u670d\u52a1\u5668\u7aef\u53e3(\u76ee\u7684\u7aef\u53e3) <\/span>
          \n public<\/span> Client<\/span>(<\/span>String<\/span> serverIp,<\/span> int<\/span> serverPort)<\/span> throws<\/span> SocketException<\/span> {<\/span>
          \n this<\/span>.<\/span>serverIp =<\/span> serverIp;<\/span>
          \n this<\/span>.<\/span>serverPort =<\/span> serverPort;<\/span>
          \n \/\/\u4e0b\u9762\u5c31\u662f\u81ea\u52a8\u5206\u914d\u4e00\u4e2a\u7aef\u53e3\u53f7 <\/span>
          \n socket =<\/span> new<\/span> DatagramSocket<\/span>(<\/span>)<\/span>;<\/span>
          \n }<\/span> <\/p>\n

          public<\/span> void<\/span> start<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u5ba2\u6237\u7aef\u542f\u52a8"<\/span>)<\/span>;<\/span>
          \n Scanner<\/span> scanner =<\/span> new<\/span> Scanner<\/span>(<\/span>System<\/span>.<\/span>in)<\/span>;<\/span>
          \n while<\/span>(<\/span>true<\/span>)<\/span>{<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"-> "<\/span>)<\/span>;<\/span>
          \n \/\/1. \u4ece\u63a7\u5236\u53f0\u4e2d\u8bfb\u53d6\u8bf7\u6c42\u6570\u636e <\/span>
          \n String<\/span> request =<\/span> scanner.<\/span>next<\/span>(<\/span>)<\/span>;<\/span> <\/p>\n

          \/\/2. \u6784\u9020\u8bf7\u6c42\u5e76\u53d1\u9001 <\/span>
          \n DatagramPacket<\/span> requestPacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>request.<\/span>getBytes<\/span>(<\/span>)<\/span>,<\/span>
          \n request.<\/span>getBytes<\/span>(<\/span>)<\/span>.<\/span>length,<\/span> InetAddress<\/span>.<\/span>getByName<\/span>(<\/span>serverIp)<\/span>,<\/span>serverPort)<\/span>;<\/span> <\/p>\n

          socket.<\/span>send<\/span>(<\/span>requestPacket)<\/span>;<\/span> <\/p>\n

          \/\/3. \u8bfb\u53d6\u670d\u52a1\u5668\u7684\u54cd\u5e94 <\/span>
          \n DatagramPacket<\/span> responsePacket =<\/span> new<\/span> DatagramPacket<\/span>(<\/span>new<\/span> byte<\/span>[<\/span>4096<\/span>]<\/span>,<\/span>4096<\/span>)<\/span>;<\/span> <\/p>\n

          socket.<\/span>receive<\/span>(<\/span>responsePacket)<\/span>;<\/span> <\/p>\n

          \/\/4. \u628a\u54cd\u5e94\u8f6c\u5316\u6210\u5b57\u7b26\u4e32，\u5e76\u663e\u793a\u5230\u63a7\u5236\u53f0\u4e0a <\/span>
          \n String<\/span> response =<\/span> new<\/span> String<\/span>(<\/span>responsePacket.<\/span>getData<\/span>(<\/span>)<\/span>,<\/span>0<\/span>,<\/span>responsePacket.<\/span>getLength<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
          \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>response)<\/span>;<\/span> <\/p>\n

          }<\/span>
          \n }<\/span> <\/p>\n

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

          }<\/span><\/p>\n

          \u901a\u4fe1\u8fc7\u7a0b：<\/h3>\n

          \u6b64\u65f6\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u5c31\u53ef\u4ee5\u76f8\u4e92\u914d\u5408，\u5b8c\u6210\u901a\u4fe1\u8fc7\u7a0b：<\/p>\n

          \u6b65\u9aa4\u5982\u4e0b：<\/p>\n

        • \u5148\u542f\u52a8\u670d\u52a1\u5668<\/li>\n
        • \u518d\u542f\u52a8\u5ba2\u6237\u7aef<\/li>\n
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        • \u7136\u540e\u5c31\u53ef\u4ee5\u5728\u670d\u52a1\u5668\u4e2d\u770b\u89c1<\/li>\n

          \u4e0b\u9762\u662f \u5ba2\u6237\u7aef\u7684\u754c\u9762\u5c55\u793a： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u4e0b\u9762\u662f\u670d\u52a1\u5668\u7684\u754c\u9762\u5c55\u793a： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

          \u6267\u884c\u8fc7\u7a0b：<\/p>\n

        • \u7b2c\u4e00\u6b65：\u670d\u52a1\u5668\u542f\u52a8，\u8fdb\u5165while\u5faa\u73af，\u6267\u884c\u5230receive\u8fd9\u91cc\u65f6\u53d1\u751f\u963b\u585e(\u6b64\u65f6\u5ba2\u6237\u7aef\u8fd8\u6ca1\u6709\u53d1\u9001\u8bf7\u6c42)<\/li>\n
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        • \u5ba2\u6237\u7aef\u5b8c\u6210\u4e00\u6b21\u5faa\u73af\u4e4b\u540e，\u5c31\u53c8\u4f1a\u6267\u884c\u5230scanner.next，\u91cd\u65b0\u8fdb\u5165\u963b\u585e<\/li>\n

          \u6211\u4eec\u91cd\u70b9\u8981\u7406\u89e3\u7f51\u7edc\u7a0b\u5e8f\u7684\u4ea4\u4e92\u903b\u8f91<\/p>\n

          \u521a\u521a\u7684\u4e24\u4e2a\u7a0b\u5e8f\u90fd\u662f\u5728\u4e00\u4e2a\u4e3b\u673a\u4e0a\u7684，\u6ca1\u6709\u5b9e\u73b0\u8de8\u4e3b\u673a\u901a\u4fe1\u7684\u6548\u679c<\/p>\n

          \u80fd\u5426\u8ba9\u540c\u5b66\u4f7f\u7528\u5ba2\u6237\u7aef\u7a0b\u5e8f\u6765\u8bbf\u95ee\u8001\u5e08\u7684\u670d\u52a1\u5668\u4ee3\u7801\u5462？<\/p>\n

          \u5982\u679c\u6211\u7684\u670d\u52a1\u5668\u5c31\u5728\u6211\u7684\u7535\u8111\u4e0a，\u6b64\u65f6，\u4f60\u662f\u4e0d\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u7684，\u9664\u975e\u8001\u5e08\u548c\u540c\u5b66\u7684\u7535\u8111\u90fd\u5728\u540c\u4e00\u4e2a\u5c40\u57df\u7f51\u4e0b，\u5373\u540c\u4e00\u4e2a\u8def\u7531\u5668\u4e0b，\u624d\u53ef\u4ee5<\/p>\n

          \u4f46\u662f\u8fd8\u6709\u4e00\u79cd\u65b9\u5f0f\u201c \u4e91\u670d\u52a1\u5668\u201d \u6709\u4e86\u8fd9\u4e2a，\u5c31\u53ef\u4ee5\u8bbf\u95ee\u8001\u5e08\u7684\u7535\u8111\u4e86，\u56e0\u4e3a\u8001\u5e08\u7684\u7535\u8111\u6ca1\u6709\u516c\u7f51IP，\u4f46\u662f\u4e91\u670d\u52a1\u5668\u6709\u516c\u7f51IP<\/p>\n

          jar\u5305\u662fjava\u6253\u5305\u7684\u4e00\u79cd\u57fa\u672c\u65b9\u5f0f<\/p>\n

          \u628a\u521a\u624d\u7684UDP\u670d\u52a1\u5668\u90e8\u7f72\u5230\u4e91\u670d\u52a1\u5668\u4e0a，\u8fdb\u4e00\u6b65\u7684，\u5c31\u53ef\u4ee5\u8ba9\u5927\u5bb6\u6765\u8bbf\u95ee\u4e86<\/p>\n

          \u4e4b\u540e\u53ef\u4ee5\u8c03\u6574\u4e00\u4e0b\u5ba2\u6237\u7aef\u7684\u4ee3\u7801，\u8ba9\u5ba2\u6237\u7aef\u8bbf\u95ee\u4e91\u670d\u52a1\u5668\u4e0a\u7684\u670d\u52a1\u7a0b\u5e8f，\u5c31\u53ea\u9700\u8981\u628aIP\u5730\u5740\u6362\u6210\u4e91\u670d\u52a1\u5668\u7684IP\u5373\u53ef<\/p>\n

          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

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