{"id":40470,"date":"2023-07-30T16:49:46","date_gmt":"2023-07-30T08:49:46","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=40470"},"modified":"2023-07-30T16:49:47","modified_gmt":"2023-07-30T08:49:47","slug":"java-nio%e4%b8%adselector%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/40470.html","title":{"rendered":"Java Nio\u4e2dSelector\u662f\u4ec0\u4e48"},"content":{"rendered":"\n
\n

Java Nio\u4e2dSelector\u4e00\u822c\u79f0\u4e3a\u9009\u62e9\u5668\uff0c\u5b83\u662f Java NIO \u6838\u5fc3\u7ec4\u4ef6\u4e2d\u7684\u4e00\u4e2a\uff0c\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u6216\u8005\u591a\u4e2a NIO Channel (\u901a\u9053) \u7684\u72b6\u6001\u662f\u5426\u5904\u4e8e\u53ef\u8bfb\u3001\u53ef\u5199\u3002Selector\u7684\u7528\u9014\uff1a1\u3001\u5b9e\u73b0\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053\uff1b2\u3001\u975e\u963b\u585e\u5f0fI\/O\u64cd\u4f5c\u7b49\u3002\u5b9e\u73b0\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053\u662f\u6307\uff0cSelector\u53ef\u4ee5\u901a\u8fc7\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053\uff0c\u4f7f\u5f97\u5355\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u5904\u7406\u591a\u4e2a\u901a\u9053\u7684I\/O\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u4e00\u3001Java Nio\u4e2dSelector\u7684\u6982\u5ff5 <\/h2>\n\n\n\n

\u5728Java NIO\uff08New I\/O\uff09\u4e2d\uff0cSelector\uff08\u9009\u62e9\u5668\uff09\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u7ec4\u4ef6\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u6548\u7684\u591a\u8def\u590d\u7528\u673a\u5236\uff0c\u7528\u4e8e\u76d1\u89c6\u591a\u4e2a\u901a\u9053\uff08Channel\uff09\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u5728\u8fd9\u4e9b\u901a\u9053\u4e2d\u6709\u4e8b\u4ef6\u53d1\u751f\u65f6\u8fdb\u884c\u54cd\u5e94\u3002<\/p>\n\n\n\n

\u4f20\u7edf\u7684I\/O\uff08InputStream\u548cOutputStream\uff09\u662f\u963b\u585e\u5f0f\u7684\uff0c\u5373\u5728\u8bfb\u5199\u6570\u636e\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u6570\u636e\u53ef\u8bfb\u6216\u6ca1\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u5199\u5165\u6570\u636e\uff0c\u8bfb\u5199\u64cd\u4f5c\u4f1a\u4e00\u76f4\u963b\u585e\uff0c\u76f4\u5230\u6709\u6570\u636e\u53ef\u7528\u6216\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u3002\u8fd9\u6837\u5728\u5904\u7406\u591a\u4e2a\u901a\u9053\u7684\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u4f7f\u7528\u591a\u4e2a\u7ebf\u7a0b\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u5904\u7406\u4e00\u4e2a\u901a\u9053\uff0c\u8fd9\u6837\u4f1a\u5bfc\u81f4\u7ebf\u7a0b\u6570\u7684\u589e\u52a0\u548c\u8d44\u6e90\u7684\u6d6a\u8d39\u3002<\/p>\n\n\n\n

Java NIO\u5f15\u5165\u4e86\u975e\u963b\u585e\u5f0fI\/O\uff0c\u5176\u4e2d\u7684\u5173\u952e\u7ec4\u4ef6\u4e4b\u4e00\u5c31\u662fSelector\u3002Selector\u5141\u8bb8\u4e00\u4e2a\u5355\u72ec\u7684\u7ebf\u7a0b\u6765\u76d1\u89c6\u591a\u4e2a\u901a\u9053\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u5728\u4e00\u4e2a\u6216\u591a\u4e2a\u901a\u9053\u51c6\u5907\u5c31\u7eea\u65f6\uff0c\u901a\u8fc7\u9009\u62e9\u952e\uff08SelectionKey\uff09\u6765\u8bc6\u522b\u8fd9\u4e9b\u901a\u9053\u3002\u901a\u9053\u7684\u51c6\u5907\u5c31\u7eea\u72b6\u6001\u901a\u5e38\u662f\u6307\u8be5\u901a\u9053\u53ef\u4ee5\u8fdb\u884c\u8bfb\u53d6\uff08\u6570\u636e\u5df2\u7ecf\u5230\u8fbe\uff09\u6216\u5199\u5165\uff08\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u5199\u5165\u6570\u636e\uff09\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\u4e8c\u3001Java Nio\u4e2dSelector\u7684\u7528\u9014 <\/h2>\n\n\n\n

1\u3001\u5b9e\u73b0\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053<\/strong><\/p>\n\n\n\n

\u5728\u4f20\u7edf\u7684Java I\/O\u6a21\u578b\u4e2d\uff0c\u6bcf\u4e2a\u901a\u9053\u90fd\u9700\u8981\u4e00\u4e2a\u72ec\u7acb\u7684\u7ebf\u7a0b\u6765\u5904\u7406\uff0c\u5f53\u6709\u5927\u91cf\u901a\u9053\u65f6\uff0c\u7ebf\u7a0b\u6570\u91cf\u4f1a\u6025\u5267\u589e\u52a0\uff0c\u5bfc\u81f4\u8d44\u6e90\u6d88\u8017\u548c\u7ebf\u7a0b\u5207\u6362\u5e26\u6765\u7684\u5f00\u9500\u3002\u800cSelector\u53ef\u4ee5\u901a\u8fc7\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053\uff0c\u5b9e\u73b0\u4e86\u4e00\u79cd\u9ad8\u6548\u7684\u591a\u8def\u590d\u7528\u673a\u5236\uff0c\u4f7f\u5f97\u5355\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u5904\u7406\u591a\u4e2a\u901a\u9053\u7684I\/O\u64cd\u4f5c\u3002<\/p>\n\n\n\n

2\u3001\u975e\u963b\u585e\u5f0fI\/O\u64cd\u4f5c<\/strong><\/p>\n\n\n\n

\u4f7f\u7528Selector\u53ef\u4ee5\u5b9e\u73b0\u975e\u963b\u585e\u5f0f\u7684I\/O\u64cd\u4f5c\uff0c\u5373\u5f53\u4e00\u4e2a\u901a\u9053\u6ca1\u6709\u6570\u636e\u53ef\u8bfb\u53d6\u6216\u53ef\u5199\u5165\u65f6\uff0c\u4e0d\u4f1a\u963b\u585e\u7ebf\u7a0b\uff0c\u800c\u662f\u7acb\u5373\u8fd4\u56de\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u7ebf\u7a0b\u7684\u957f\u65f6\u95f4\u7b49\u5f85\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u7684\u54cd\u5e94\u901f\u5ea6\u3002<\/p>\n\n\n\n

3\u3001\u63d0\u9ad8\u8d44\u6e90\u5229\u7528\u7387<\/strong><\/p>\n\n\n\n

\u901a\u8fc7Selector\uff0c\u53ef\u4ee5\u4f7f\u7528\u8f83\u5c11\u7684\u7ebf\u7a0b\u6765\u5904\u7406\u5927\u91cf\u7684\u901a\u9053\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u7ebf\u7a0b\u7684\u521b\u5efa\u548c\u9500\u6bc1\u5f00\u9500\uff0c\u63d0\u9ad8\u4e86\u8d44\u6e90\u7684\u5229\u7528\u7387\u3002<\/p>\n\n\n\n

4\u3001\u4e8b\u4ef6\u9a71\u52a8\u7684\u7f16\u7a0b\u6a21\u578b<\/strong><\/p>\n\n\n\n

Selector\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u7684\u7f16\u7a0b\u6a21\u578b\uff0c\u5b83\u901a\u8fc7\u68c0\u6d4b\u901a\u9053\u4e0a\u7684\u4e8b\u4ef6\uff08\u5982\u8bfb\u5c31\u7eea\u3001\u5199\u5c31\u7eea\u7b49\uff09\u6765\u9a71\u52a8\u7a0b\u5e8f\u7684\u6267\u884c\u3002\u5f53\u4e00\u4e2a\u6216\u591a\u4e2a\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0cSelector\u4f1a\u901a\u77e5\u7a0b\u5e8f\u5e76\u5c06\u76f8\u5e94\u7684\u901a\u9053\u52a0\u5165\u5c31\u7eea\u96c6\u5408\uff0c\u7a0b\u5e8f\u53ef\u4ee5\u6839\u636e\u5c31\u7eea\u96c6\u5408\u8fdb\u884c\u76f8\u5e94\u7684I\/O\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\u4e09\u3001Java Nio\u4e2dSelector\u7684\u4f18\u7f3a\u70b9<\/h2>\n\n\n\n

\u4f18\u70b9\uff1a<\/strong><\/p>\n\n\n\n

    \n
  1. \u5b9e\u73b0\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053\uff0c\u63d0\u9ad8\u8d44\u6e90\u5229\u7528\u7387\uff1a Selector\u53ef\u4ee5\u901a\u8fc7\u5355\u7ebf\u7a0b\u7ba1\u7406\u591a\u4e2a\u901a\u9053\uff0c\u907f\u514d\u4e86\u6bcf\u4e2a\u901a\u9053\u90fd\u9700\u8981\u4e00\u4e2a\u72ec\u7acb\u7ebf\u7a0b\u7684\u60c5\u51b5\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u7ebf\u7a0b\u7684\u521b\u5efa\u548c\u9500\u6bc1\u5f00\u9500\uff0c\u63d0\u9ad8\u4e86\u8d44\u6e90\u5229\u7528\u7387\u3002<\/li>\n\n\n\n
  2. \u975e\u963b\u585e\u5f0fI\/O\u64cd\u4f5c\uff0c\u907f\u514d\u7ebf\u7a0b\u957f\u65f6\u95f4\u7b49\u5f85\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u54cd\u5e94\u901f\u5ea6\uff1a \u4f7f\u7528Selector\u53ef\u4ee5\u5b9e\u73b0\u975e\u963b\u585e\u5f0f\u7684I\/O\u64cd\u4f5c\uff0c\u5373\u5f53\u4e00\u4e2a\u901a\u9053\u6ca1\u6709\u6570\u636e\u53ef\u8bfb\u53d6\u6216\u53ef\u5199\u5165\u65f6\uff0c\u4e0d\u4f1a\u963b\u585e\u7ebf\u7a0b\uff0c\u800c\u662f\u7acb\u5373\u8fd4\u56de\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u7ebf\u7a0b\u7684\u957f\u65f6\u95f4\u7b49\u5f85\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u7684\u54cd\u5e94\u901f\u5ea6\u3002<\/li>\n\n\n\n
  3. \u652f\u6301\u4e8b\u4ef6\u9a71\u52a8\u7684\u7f16\u7a0b\u6a21\u578b\uff0c\u7b80\u5316I\/O\u7f16\u7a0b\uff1a Selector\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u7684\u7f16\u7a0b\u6a21\u578b\uff0c\u901a\u8fc7\u68c0\u6d4b\u901a\u9053\u4e0a\u7684\u4e8b\u4ef6\u6765\u9a71\u52a8\u7a0b\u5e8f\u7684\u6267\u884c\uff0c\u76f8\u6bd4\u4f20\u7edf\u7684\u963b\u585e\u5f0fI\/O\uff0c\u53ef\u4ee5\u7b80\u5316I\/O\u7f16\u7a0b\uff0c\u4f7f\u5f97\u7a0b\u5e8f\u66f4\u52a0\u6613\u4e8e\u7ef4\u62a4\u548c\u6269\u5c55\u3002<\/li>\n\n\n\n
  4. \u53ef\u4ee5\u540c\u65f6\u5904\u7406\u591a\u4e2a\u901a\u9053\u7684I\/O\u64cd\u4f5c\uff0c\u63d0\u9ad8\u5e76\u53d1\u5904\u7406\u80fd\u529b\uff1a Selector\u53ef\u4ee5\u540c\u65f6\u5904\u7406\u591a\u4e2a\u901a\u9053\u7684I\/O\u64cd\u4f5c\uff0c\u4f7f\u5f97\u5355\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u5904\u7406\u591a\u4e2a\u901a\u9053\u7684\u4e8b\u4ef6\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u5e76\u53d1\u5904\u7406\u80fd\u529b\u3002<\/li>\n<\/ol>\n\n\n\n

    \u7f3a\u70b9\uff1a<\/strong><\/p>\n\n\n\n

      \n
    1. \u7f16\u7a0b\u590d\u6742\u6027\u9ad8\uff0c\u76f8\u6bd4\u4f20\u7edf\u7684\u963b\u585e\u5f0fI\/O\uff0c\u4f7f\u7528Selector\u9700\u8981\u66f4\u591a\u7684\u4ee3\u7801\uff1a \u4f7f\u7528Selector\u9700\u8981\u66f4\u591a\u7684\u4ee3\u7801\u6765\u5904\u7406\u4e8b\u4ef6\u9a71\u52a8\u7684\u903b\u8f91\uff0c\u76f8\u6bd4\u4f20\u7edf\u7684\u963b\u585e\u5f0fI\/O\uff0c\u7f16\u7a0b\u590d\u6742\u6027\u8f83\u9ad8\uff0c\u9700\u8981\u66f4\u6df1\u5165\u7684\u7406\u89e3\u548c\u638c\u63e1\u3002<\/li>\n\n\n\n
    2. Selector\u672c\u8eab\u4e5f\u9700\u8981\u6d88\u8017\u4e00\u5b9a\u7684\u7cfb\u7edf\u8d44\u6e90\uff1a Selector\u672c\u8eab\u4e5f\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u9700\u8981\u6d88\u8017\u4e00\u5b9a\u7684\u7cfb\u7edf\u8d44\u6e90\uff0c\u5c24\u5176\u662f\u5728\u5927\u89c4\u6a21\u5e76\u53d1\u8fde\u63a5\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u4f1a\u5bf9\u7cfb\u7edf\u6027\u80fd\u4ea7\u751f\u4e00\u5b9a\u7684\u5f71\u54cd\u3002<\/li>\n\n\n\n
    3. \u5355\u4e2a\u7ebf\u7a0b\u5904\u7406\u591a\u4e2a\u901a\u9053\uff0c\u5982\u679c\u67d0\u4e2a\u901a\u9053\u7684\u5904\u7406\u65f6\u95f4\u8fc7\u957f\uff0c\u4f1a\u5f71\u54cd\u5176\u4ed6\u901a\u9053\u7684\u5904\u7406\u901f\u5ea6\uff1a \u7531\u4e8eSelector\u4f7f\u7528\u5355\u4e2a\u7ebf\u7a0b\u5904\u7406\u591a\u4e2a\u901a\u9053\uff0c\u5982\u679c\u67d0\u4e2a\u901a\u9053\u7684\u5904\u7406\u65f6\u95f4\u8fc7\u957f\uff0c\u4f1a\u5f71\u54cd\u5176\u4ed6\u901a\u9053\u7684\u5904\u7406\u901f\u5ea6\uff0c\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n\n\n\n
    4. \u4e0d\u9002\u7528\u4e8e\u6240\u6709\u573a\u666f\uff0c\u7279\u522b\u662f\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u7684\u573a\u666f\u4e0b\uff0c\u53ef\u80fd\u4f1a\u5b58\u5728\u6027\u80fd\u74f6\u9888\uff1a \u867d\u7136Selector\u5728\u5904\u7406\u5e76\u53d1\u8fde\u63a5\u65f6\u5177\u6709\u4f18\u52bf\uff0c\u4f46\u5728\u5904\u7406\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u7684\u573a\u666f\u4e0b\uff0c\u53ef\u80fd\u4f1a\u5b58\u5728\u6027\u80fd\u74f6\u9888\uff0c\u4e0d\u9002\u7528\u4e8e\u6240\u6709\u573a\u666f\u3002\u5728\u4e00\u4e9b\u7279\u5b9a\u7684\u573a\u666f\u4e0b\uff0c\u5176\u4ed6I\/O\u6a21\u578b\u53ef\u80fd\u66f4\u52a0\u9002\u5408\u3002<\/li>\n<\/ol>\n\n\n\n

      \u5ef6\u4f38\u9605\u8bfb<\/strong><\/h2>\n\n\n\n

      \u4f7f\u7528Selector\u7684\u57fa\u672c\u6d41\u7a0b<\/strong><\/p>\n\n\n\n

        \n
      1. \u5c06\u4e00\u4e2a\u6216\u591a\u4e2a\u901a\u9053\u6ce8\u518c\u5230Selector\u4e0a\uff0c\u901a\u8fc7\u8c03\u7528\u901a\u9053\u7684register()\u65b9\u6cd5\uff0c\u5e76\u6307\u5b9a\u611f\u5174\u8da3\u7684\u4e8b\u4ef6\u7c7b\u578b\uff0c\u5982\u8bfb\u4e8b\u4ef6\u3001\u5199\u4e8b\u4ef6\u7b49\u3002<\/li>\n\n\n\n
      2. \u4e0d\u65ad\u8f6e\u8be2Selector\uff0c\u8c03\u7528\u5176select()\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4f1a\u963b\u585e\uff0c\u76f4\u5230\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u901a\u9053\u51c6\u5907\u5c31\u7eea\u3002<\/li>\n\n\n\n
      3. \u4e00\u65e6select()\u65b9\u6cd5\u8fd4\u56de\uff0c\u8868\u793a\u6709\u901a\u9053\u51c6\u5907\u5c31\u7eea\uff0c\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528selectedKeys()\u65b9\u6cd5\u83b7\u53d6\u9009\u62e9\u952e\u96c6\u5408\uff0c\u7136\u540e\u904d\u5386\u9009\u62e9\u952e\u96c6\u5408\u6765\u5904\u7406\u5c31\u7eea\u7684\u901a\u9053\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"Java Nio\u4e2dSelector\u4e00\u822c\u79f0\u4e3a\u9009\u62e9\u5668\uff0c\u5b83\u662f Java NIO \u6838\u5fc3\u7ec4\u4ef6\u4e2d\u7684\u4e00\u4e2a\uff0c\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u6216\u8005\u591a […]","protected":false},"author":1,"featured_media":40471,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[119],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/40470"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=40470"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/40470\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/40471"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=40470"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=40470"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=40470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}