{"id":31677,"date":"2023-08-20T14:55:58","date_gmt":"2023-03-17T01:30:52","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%87%ba%e9%97%ae%e9%a2%98%e4%ba%86%e5%90%97%ef%bc%9f\/"},"modified":"2024-04-30T19:22:42","modified_gmt":"2024-04-30T11:22:42","slug":"java%e5%87%ba%e9%97%ae%e9%a2%98%e4%ba%86%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%87%ba%e9%97%ae%e9%a2%98%e4%ba%86%e5%90%97%ef%bc%9f\/","title":{"rendered":"Java\u51fa\u95ee\u9898\u4e86\u5417\uff1f"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5982\u679c\u5728\u6d4f\u89c8\u5668\u8bbf\u95ee\u65f6\u6ca1\u6709\u54cd\u5e94\uff0c\u5e76\u4e14\u6a21\u7cca\u5730\u8be2\u95ee\u670d\u52a1\u5668\u7aef\u7684Java\u662f\u5426\u6302\u8d77\uff0c\u4f60\u53ef\u80fd\u4f1a\u60f3\u77e5\u9053\u6000\u7591Java\u865a\u62df\u673a\u7684\u539f\u56e0\u662f\u4ec0\u4e48\u3002\u4f46\u53ef\u4ee5\u63a8\u6d4b\uff0c\u8fd9\u662f\u51fa\u4e8e\u4ee5\u4e0b\u539f\u56e0\u5e0c\u671b\u6309\u4ee5\u4e0b\u987a\u5e8f\u8fdb\u884c\u8c03\u67e5\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Java VM \u3082\u3057\u304f\u306f\u3001\u305d\u306e\u4e0a\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30df\u30c9\u30eb\u30a6\u30a8\u30a2\u3068\u3057\u3066\u30b5\u30dd\u30fc\u30c8\u62c5\u5f53\u304b\u3089\u306e\u898b\u89e3\u304c\u5fc5\u8981<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u554f\u984c\u304c\u306a\u3051\u308c\u3070\u3001\u305d\u306e\u65e8\u306e\u7b54\u3048\u3067\u3082OK<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30b5\u30dd\u30fc\u30c8\u62c5\u5f53\u306e\u898b\u89e3\u3092\u3082\u3063\u3066\u3001\u6b21\u306f\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3082\u3057\u304f\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u62c5\u5f53\u3078\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u3044\u305f\u3044<\/ul>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u5c06\u63d0\u4f9b\u4e00\u4e2a\u5e38\u89c1\u7684\u4f8b\u5b50\u3002<\/p>\n<h1>Java\u7ebf\u7a0b\u8f6c\u50a8<\/h1>\n<p>\u5f53\u6211\u4eec\u80fd\u591f\u83b7\u53d6\u5230Java\u7ebf\u7a0b\u8f6c\u50a8\u65f6\uff0c\u53ef\u4ee5\u8bf4\u660eJava\u865a\u62df\u673a\u7684\u529f\u80fd\u6b63\u5e38\u8fd0\u884c\uff0c\u56e0\u6b64\u53ef\u4ee5\u8bf4Java\u865a\u62df\u673a\u672c\u8eab\u5e76\u6ca1\u6709\u6302\u8d77\uff0c\u4f46\u6211\u4eec\u9996\u5148\u9700\u8981\u67e5\u770b\u5185\u5bb9\u3002<\/p>\n<p>\u95ee\u9898\u90e8\u5206\u7684\u7ebf\u7a0b\u8f6c\u50a8<\/p>\n<pre class=\"post-pre\"><code>\"default task-4\" #116 prio=5 os_prio=0 tid=0x0000000003ba3800 nid=0x7894 runnable [0x00007f58c80c7000]\r\n   java.lang.Thread.State: RUNNABLE\r\n        at java.net.SocketInputStream.socketRead0(Native Method)\r\n        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)\r\n        at java.net.SocketInputStream.read(SocketInputStream.java:171)\r\n        at java.net.SocketInputStream.read(SocketInputStream.java:141)\r\n        at oracle.net.ns.Packet.receive(Packet.java:311)\r\n        at oracle.net.ns.DataPacket.receive(DataPacket.java:105)\r\n        at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:305)\r\n        at oracle.net.ns.NetInputStream.read(NetInputStream.java:249)\r\n        at oracle.net.ns.NetInputStream.read(NetInputStream.java:171)\r\n        at oracle.net.ns.NetInputStream.read(NetInputStream.java:89)\r\n        at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:123)\r\n        at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:79)\r\n        at oracle.jdbc.driver.T4CMAREngineStream.unmarshalUB1(T4CMAREngineStream.java:426)\r\n        at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:390)\r\n        at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)\r\n        at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566)\r\n        at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:202)\r\n        at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:45)\r\n        at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:766)\r\n        at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:897)\r\n        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1026)\r\n        at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1244)\r\n        - locked &lt;0x00000000fcd35220&gt; (a oracle.jdbc.driver.T4CConnection)\r\n        at oracle.jdbc.driver.OracleStatementWrapper.executeQuery(OracleStatementWrapper.java:420)\r\n        at org.jboss.jca.adapters.jdbc.WrappedStatement.executeQuery(WrappedStatement.java:397)\r\n        at abc.doGet(abc.java:37)\r\n... \u5f8c\u7565 ...\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8bbf\u95ee\u4e86\u540d\u4e3aabc\u7684servlet\uff0c\u65e0\u6cd5\u83b7\u5f97\u54cd\u5e94\uff0c\u90a3\u4e48\u67e5\u770b\u4e0eabc\u76f8\u5173\u7684\u5806\u6808\u4f1a\u663e\u793a\u5982\u4e0a\u6240\u8ff0\u7684\u5185\u5bb9\u3002\u4ece\u4e0b\u5f80\u4e0a\u770b\uff0c\u5927\u81f4\u662f\u901a\u8fc7jdbc\u7684doExecuteWithTimeout\uff0c\u518d\u5230NetInputStream.read\uff0c\u7136\u540e\u662fsocketRead0\uff0c\u8fdb\u5165\u4e86\u8bfb\u7b49\u5f85\u72b6\u6001\u3002\u7b49\u5f85\u4e86\u51e0\u5341\u79d2\u540e\uff0c\u518d\u6b21\u83b7\u53d6\u7ebf\u7a0b\u8f6c\u50a8\uff0c\u60c5\u51b5\u6ca1\u6709\u53d1\u751f\u53d8\u5316\u3002\u51ed\u76f4\u89c9\u6765\u770b\uff0c\u7531\u4e8e\u5b58\u5728doExecuteWithTimeout\uff0c\u4f3c\u4e4e\u8fbe\u5230\u4e86jdbc\u7684\u8d85\u65f6\u60c5\u51b5\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u4ee5\u4e0b\u7b2c\u4e94\u4e2a\u64cd\u4f5c\u4e2d\uff0c\u4ecd\u7136\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\uff0c\u65e0\u6cd5\u7ee7\u7eed\u4e0b\u4e00\u6b65\u5904\u7406\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u901a\u8fc7\u6d4f\u89c8\u5668\u5411\u670d\u52a1\u5668\u53d1\u9001HTTP GET\u8bf7\u6c42\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4e3a\u4e86\u751f\u6210\u54cd\u5e94\u5185\u5bb9\uff0cServlet\u4f7f\u7528jdbc\u5c06SQL\u63d0\u4ea4\u7ed9oracle\u6570\u636e\u5e93\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>SQL\u67e5\u8be2\u5728\u67e5\u8be2\u8d85\u65f6\u65f6\u95f4\u5185\u672a\u80fd\u83b7\u53d6\u7ed3\u679c\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f5c\u4e3a\u8d85\u65f6\u5904\u7406\u7684\u4e00\u90e8\u5206\uff0c\u4f7f\u7528statement.cancel\u547d\u4ee4\u5411jdbc\u53d1\u51fa\u53d6\u6d88\u8bf7\u6c42\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6b63\u5728\u7b49\u5f85\u5bf9\u53d6\u6d88\u8bf7\u6c42\u7684\u54cd\u5e94\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5982\u679c\u53ef\u4ee5\u83b7\u5f97\u53d6\u6d88\u8bf7\u6c42\u7684\u54cd\u5e94\uff0c\u5c06\u5176\u4f5c\u4e3aSQLTimeoutException\u5904\u7406\uff0c\u7136\u540e\u6267\u884c\u76f8\u5e94\u7684\u5f02\u5e38\u5904\u7406&#8230;\u53ef\u80fd\u662f\u8fd9\u6837\u3002<\/ol>\n<p>\u6ce8\u610f\uff1a\u901a\u8fc7\u5411\u53ef\u4ee5\u6b63\u786e\u54cd\u5e94\u7684 DB \u53d1\u51fa\u8bf7\u6c42\uff0cstatement.cancel \u5c06\u88ab\u53d6\u6d88\u3002<\/p>\n<p>\u8fd9\u610f\u5473\u7740\u6570\u636e\u5e93\u53ef\u80fd\u5b58\u5728\u95ee\u9898\u5417\uff1f<\/p>\n<h1>\u4ece\u6570\u636e\u5e93\u7684\u89d2\u5ea6\u6765\u770b<\/h1>\n<p>\u5f9e\u7dda\u7a0b\u8f49\u5132\u7684\u5167\u5bb9\u4f86\u770b\uff0c\u8a62\u554f\u5728\u90a3\u500b\u6642\u9593\u662f\u5426\u5728\u6578\u64da\u5eab\u7aef\u767c\u751f\u7570\u5e38&#8230;<br \/>\n\u5b8c\u5168\u6c92\u6709\u767c\u73fe\u4efb\u4f55\u7570\u5e38\u3002\u672c\u4f86\u5c31\u8981\u8cea\u7591\u4ec0\u9ebc\u624d\u61c9\u8a72\u61f7\u7591\u6578\u64da\u5eab\uff1f\u88ab\u554f\u5230\u4e86\u3002<\/p>\n<h1>\u53d6\u6d88\u7684\u6570\u636e\u5305\u662f\u5426\u5df2\u53d1\u9001\uff1f<\/h1>\n<p>\u5982\u679c\u6570\u636e\u5e93\u6ca1\u6709\u95ee\u9898\uff0c\u6211\u5c31\u771f\u7684\u5f88\u60f3\u77e5\u9053 statement.cancel \u662f\u5426\u88ab\u6267\u884c\u5e76\u4f5c\u4e3a\u6570\u636e\u5305\u53d1\u9001\u5230\u6570\u636e\u5e93\u3002\u6240\u4ee5\uff0c\u6211\u4f1a\u91cd\u65b0\u521b\u5efa\u95ee\u9898\uff0c\u6355\u83b7\u6570\u636e\u5305\u8fdb\u884c\u786e\u8ba4\u3002<\/p>\n<p>\u5728Java\u6b63\u5728\u8fd0\u884c\u7684\u7cfb\u7edf\u4e2d<\/p>\n<pre class=\"post-pre\"><code>statement.cancel \u306b\u5bfe\u5fdc\u3057\u305f\u30d1\u30b1\u30c3\u30c8\r\n\r\n13:14:08.948939 IP rhel74.38860 &gt; 192.168.1.25.1521: Flags [P.U], seq 4510:4511, ack 5404, win 44020, urg 1, length 1\r\n..s....\r\n        0x0010:  c0a8 0119 97cc 05f1 f070 d6a2 c3a2 111d  ......-..p......\r\n        0x0020:  5038 abf4 cdeb 0001 21                   P8......!\r\n<\/code><\/pre>\n<p>\u6211\u5011\u95dc\u6ce8Flags[P.U]\uff0c\u5373PUSH\u548cURG\u6a19\u8a8c\u5df2\u8a2d\u7f6e\u3002<br \/>\n\u4e26\u4e14\u7528\u6236\u6578\u64da\u53ea\u6709\u4e00\u500b\u5b57\u7b26&#8221;!&#8221;\u3002<br \/>\n\u5f9e\u9019\u500b\u4fe1\u606f\u53ef\u4ee5\u770b\u51fa\uff0c&#8221;statement.cancel&#8221;\u88ab\u57f7\u884c\uff0c\u4e26\u6b63\u78ba\u767c\u9001\u4e86\u53d6\u6d88\u8acb\u6c42\u3002<\/p>\n<p>\u5728\u63a5\u6536\u65b9\u9762\u5462\uff1f<br \/>\n\u5728\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u7cfb\u7edf\u4e2d\u6355\u83b7\u6570\u636e\u5305\u5e76\u8fdb\u884c\u786e\u8ba4\u540e\uff0c\u6ca1\u6709\u627e\u5230\u4e0e\u4e0a\u8ff0\u5bf9\u5e94\u7684\u6570\u636e\u5305\u3002<br \/>\n\u7531\u4e8e\u901a\u8fc7\u4e86NAT\u548c\u591a\u4e2a\u7f51\u7edc\u8bbe\u5907\uff0c\u6240\u4ee5\u770b\u8d77\u6765\u6570\u636e\u5305\u5728\u67d0\u4e2a\u5730\u65b9\u88ab\u4e22\u5f03\u4e86\u3002<br \/>\n\u203b \u6839\u636e\u6211\u7684\u7ecf\u9a8c\uff0c\u6709\u65f6\u53ea\u6709TCP\u7684URG\u6807\u5fd7\u88ab\u4e22\u5f03\u7684\u60c5\u51b5\u3002\u672a\u8bbe\u7f6eURG\u7684 &#8220;!&#8221; 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