{"id":269,"date":"2023-05-27T20:02:15","date_gmt":"2023-05-27T12:02:15","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=269"},"modified":"2023-05-27T20:02:15","modified_gmt":"2023-05-27T12:02:15","slug":"0cc1789721","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/java\/0cc1789721\/","title":{"rendered":"\u7ec6\u6570\u7ebf\u7a0b\u6c60\u768410\u4e2a\u5751\uff0c\u9762\u8bd5\u7ebf\u7a0b\u4e0d\u6015\u4e0d\u6015\u5566"},"content":{"rendered":"
\n

\u524d\u8a00<\/span><\/h2>\n

\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u4e3a\u4e86\u66f4\u597d\u7ba1\u7406\u7ebf\u7a0b\u8d44\u6e90\uff0c\u51cf\u5c11\u521b\u5efa\u7ebf\u7a0b\u548c\u9500\u6bc1\u7ebf\u7a0b\u7684\u8d44\u6e90\u635f\u8017\uff0c\u6211\u4eec\u4f1a\u4f7f\u7528\u7ebf\u7a0b\u6c60\u6765\u6267\u884c\u4e00\u4e9b\u5f02\u6b65\u4efb\u52a1\u3002<\/span>\u4f46\u662f\u7ebf\u7a0b\u6c60\u4f7f\u7528\u4e0d\u5f53\uff0c\u5c31\u53ef\u80fd\u4f1a\u5f15\u53d1\u751f\u4ea7\u4e8b\u6545\u3002<\/span>\u4eca\u5929\u8ddf\u5927\u5bb6\u804a\u804a\u7ebf\u7a0b\u6c60\u768410\u4e2a\u5751\u3002<\/span>\u5927\u5bb6\u770b\u5b8c\u80af\u5b9a\u4f1a\u6709\u5e2e\u52a9\u7684~<\/span><\/p>\n

    \n
  1. \n
    \u7ebf\u7a0b\u6c60\u9ed8\u8ba4\u4f7f\u7528\u65e0\u754c\u961f\u5217\uff0c\u4efb\u52a1\u8fc7\u591a\u5bfc\u81f4OOM<\/section>\n<\/li>\n
  2. \n
    \u7ebf\u7a0b\u521b\u5efa\u8fc7\u591a\uff0c\u5bfc\u81f4OOM<\/section>\n<\/li>\n
  3. \n
    \u5171\u4eab\u7ebf\u7a0b\u6c60\uff0c\u6b21\u8981\u903b\u8f91\u62d6\u57ae\u4e3b\u8981\u903b\u8f91<\/section>\n<\/li>\n
  4. \n
    \u7ebf\u7a0b\u6c60\u62d2\u7edd\u7b56\u7565\u7684\u5751<\/section>\n<\/li>\n
  5. \n
    Spring\u5185\u90e8\u7ebf\u7a0b\u6c60\u7684\u5751<\/section>\n<\/li>\n
  6. \n
    \u4f7f\u7528\u7ebf\u7a0b\u6c60\u65f6\uff0c\u6ca1\u6709\u81ea\u5b9a\u4e49\u547d\u540d<\/section>\n<\/li>\n
  7. \n
    \u7ebf\u7a0b\u6c60\u53c2\u6570\u8bbe\u7f6e\u4e0d\u5408\u7406<\/section>\n<\/li>\n
  8. \n
    \u7ebf\u7a0b\u6c60\u5f02\u5e38\u5904\u7406\u7684\u5751<\/section>\n<\/li>\n
  9. \n
    \u4f7f\u7528\u5b8c\u7ebf\u7a0b\u6c60\u5fd8\u8bb0\u5173\u95ed<\/section>\n<\/li>\n
  10. \n
    ThreadLocal\u4e0e\u7ebf\u7a0b\u6c60\u642d\u914d\uff0c\u7ebf\u7a0b\u590d\u7528\uff0c\u5bfc\u81f4\u4fe1\u606f\u9519\u4e71\u3002<\/section>\n<\/li>\n<\/ol>\n

    1.\u7ebf\u7a0b\u6c60\u9ed8\u8ba4\u4f7f\u7528\u65e0\u754c\u961f\u5217\uff0c\u4efb\u52a1\u8fc7\u591a\u5bfc\u81f4OOM<\/span><\/h2>\n

    JDK\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u7ebf\u7a0b\u6c60\u7684\u5b9e\u73b0\u7c7b\uff0c\u6211\u4eec\u57fa\u4e8eExecutors<\/code>\u7ec4\u4ef6\uff0c\u5c31\u53ef\u4ee5\u5feb\u901f\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6c60<\/strong>\u3002\u65e5\u5e38\u5de5\u4f5c\u4e2d\uff0c\u4e00\u4e9b\u5c0f\u4f19\u4f34\u4e3a\u4e86\u5f00\u53d1\u6548\u7387\uff0c\u53cd\u624b\u5c31\u7528Executors<\/code>\u65b0\u5efa\u4e2a\u7ebf\u7a0b\u6c60\u3002\u5199\u51fa\u7c7b\u4f3c\u4ee5\u4e0b\u7684\u4ee3\u7801\uff1a<\/p>\n

    \/**\n\u00a0*\u00a0\u516c\u4f17\u53f7\uff1a\u6361\u7530\u87ba\u7684\u5c0f\u7537\u5b69\n\u00a0*\/\npublic\u00a0class\u00a0NewFixedTest\u00a0{\n\n\u00a0\u00a0\u00a0\u00a0public\u00a0static\u00a0void\u00a0main(String[]\u00a0args)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ExecutorService\u00a0executor\u00a0=\u00a0Executors.newFixedThreadPool(10);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for<\/span>\u00a0(int\u00a0i\u00a0=\u00a00;\u00a0i\u00a0<\u00a0Integer.MAX_VALUE;\u00a0i++)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0executor.execute(()\u00a0->\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0try\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Thread.sleep(10000);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0catch\u00a0(InterruptedException\u00a0e)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/do<\/span>\u00a0nothing\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0}\n}\n<\/code><\/pre>\n
    \u4f7f\u7528newFixedThreadPool<\/code>\u521b\u5efa\u7684\u7ebf\u7a0b\u6c60\uff0c\u662f\u4f1a\u6709\u5751\u7684\uff0c\u5b83\u9ed8\u8ba4\u662f\u65e0\u754c\u7684\u963b\u585e\u961f\u5217\uff0c\u5982\u679c\u4efb\u52a1\u8fc7\u591a\uff0c\u4f1a\u5bfc\u81f4OOM<\/code>\u95ee\u9898\u3002\u8fd0\u884c\u4e00\u4e0b\u4ee5\u4e0a\u4ee3\u7801\uff0c\u51fa\u73b0\u4e86OOM<\/code>\u3002<\/p>\n
    Exception\u00a0in<\/span>\u00a0thread\u00a0\"main\"<\/span>\u00a0java.lang.OutOfMemoryError:\u00a0GC\u00a0overhead\u00a0limit<\/span>\u00a0exceeded\n\u00a0at\u00a0java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:416)\n\u00a0at\u00a0java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1371)\n\u00a0at\u00a0com.example.dto.NewFixedTest.main(NewFixedTest.java:14)\n<\/code><\/pre>\n
    \u8fd9\u662f\u56e0\u4e3anewFixedThreadPool<\/code>\u4f7f\u7528\u4e86\u65e0\u754c\u7684\u963b\u585e\u961f\u5217\u7684LinkedBlockingQueue<\/code>\uff0c\u5982\u679c\u7ebf\u7a0b\u83b7\u53d6\u4e00\u4e2a\u4efb\u52a1\u540e\uff0c\u4efb\u52a1\u7684\u6267\u884c\u65f6\u95f4\u6bd4\u8f83\u957f(\u6bd4\u5982\uff0c\u4e0a\u9762demo\u4ee3\u7801\u8bbe\u7f6e\u4e8610<\/code>\u79d2)\uff0c\u4f1a\u5bfc\u81f4\u961f\u5217\u7684\u4efb\u52a1\u8d8a\u79ef\u8d8a\u591a\uff0c\u5bfc\u81f4\u673a\u5668\u5185\u5b58\u4f7f\u7528\u4e0d\u505c\u98d9\u5347\uff0c \u6700\u7ec8\u51fa\u73b0OOM<\/code>\u3002<\/p>\n
    \u770b\u4e0bnewFixedThreadPool<\/code>\u7684\u76f8\u5173\u6e90\u7801\uff0c\u662f\u53ef\u4ee5\u770b\u5230\u4e00\u4e2a\u65e0\u754c\u7684\u963b\u585e\u961f\u5217\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n
    \/\/\u963b\u585e\u961f\u5217\u662fLinkedBlockingQueue\uff0c\u5e76\u4e14\u662f\u4f7f\u7528\u7684\u662f\u65e0\u53c2\u6784\u9020\u51fd\u6570\npublic\u00a0static\u00a0ExecutorService\u00a0newFixedThreadPool(int\u00a0nThreads)\u00a0{\n\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0new\u00a0ThreadPoolExecutor(nThreads,\u00a0nThreads,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a00L,\u00a0TimeUnit.MILLISECONDS,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0new\u00a0LinkedBlockingQueue<Runnable>());\n}\n\u00a0\u00a0\u00a0\u00a0\n\/\/\u65e0\u53c2\u6784\u9020\u51fd\u6570\uff0c\u9ed8\u8ba4\u6700\u5927\u5bb9\u91cf\u662fInteger.MAX_VALUE\uff0c\u76f8\u5f53\u4e8e\u65e0\u754c\u7684\u963b\u585e\u961f\u5217\u7684\u4e86\npublic\u00a0LinkedBlockingQueue<\/span><\/span>()\u00a0{\n\u00a0\u00a0\u00a0\u00a0this(Integer.MAX_VALUE);\n}\n<\/code><\/pre>\n
    \u56e0\u6b64\uff0c\u5de5\u4f5c\u4e2d\uff0c\u5efa\u8bae\u5927\u5bb6\u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60<\/strong>\uff0c\u5e76\u4f7f\u7528\u6307\u5b9a\u957f\u5ea6\u7684\u963b\u585e\u961f\u5217<\/strong>\u3002<\/p>\n
    2. \u7ebf\u7a0b\u6c60\u521b\u5efa\u7ebf\u7a0b\u8fc7\u591a\uff0c\u5bfc\u81f4OOM<\/span><\/h2>\n
    \u6709\u4e9b\u5c0f\u4f19\u4f34\u8bf4\uff0c\u65e2\u7136Executors<\/code>\u7ec4\u4ef6\u521b\u5efa\u51fa\u7684\u7ebf\u7a0b\u6c60newFixedThreadPool<\/code>\uff0c\u4f7f\u7528\u7684\u662f\u65e0\u754c\u961f\u5217\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4OOM<\/code>\u3002\u90a3\u4e48\uff0cExecutors<\/code>\u7ec4\u4ef6\u8fd8\u53ef\u4ee5\u521b\u5efa\u522b\u7684\u7ebf\u7a0b\u6c60\uff0c\u5982newCachedThreadPool<\/code>\uff0c\u6211\u4eec\u7528\u5b83\u4e5f\u4e0d\u884c\u561b\uff1f<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u770b\u4e0bnewCachedThreadPool<\/code>\u7684\u6784\u9020\u51fd\u6570\uff1a<\/p>\n
    \u00a0\u00a0\u00a0\u00a0public\u00a0static\u00a0ExecutorService\u00a0newCachedThreadPool<\/span><\/span>()\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0new\u00a0ThreadPoolExecutor(0,\u00a0Integer.MAX_VALUE,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a060L,\u00a0TimeUnit.SECONDS,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0new\u00a0SynchronousQueue<Runnable>());\n\u00a0\u00a0\u00a0\u00a0}\n\n<\/code><\/pre>\n
    \u5b83\u7684\u6700\u5927\u7ebf\u7a0b\u6570\u662fInteger.MAX_VALUE<\/code>\u3002\u5927\u5bb6\u5e94\u8be5\u610f\u8bc6\u5230\u4f7f\u7528\u5b83\uff0c\u53ef\u80fd\u4f1a\u5f15\u53d1\u4ec0\u4e48\u95ee\u9898\u4e86\u5427\u3002\u6ca1\u9519\uff0c\u5982\u679c\u521b\u5efa\u4e86\u5927\u91cf\u7684\u7ebf\u7a0b\u4e5f\u6709\u53ef\u80fd\u5f15\u53d1OOM<\/code>\uff01<\/p>\n
    \n
    \u7b14\u8005\u5728\u4ee5\u524d\u516c\u53f8\uff0c\u9047\u5230\u8fd9\u4e48\u4e00\u4e2aOOM\u95ee\u9898\uff1a\u4e00\u4e2a\u7b2c\u4e09\u65b9\u63d0\u4f9b\u7684\u5305\uff0c\u662f\u76f4\u63a5\u4f7f\u7528new Thread<\/code>\u5b9e\u73b0\u591a\u7ebf\u7a0b\u7684\u3002\u5728\u67d0\u4e2a\u591c\u6df1\u4eba\u9759\u7684\u591c\u665a\uff0c\u6211\u4eec\u7684\u76d1\u63a7\u7cfb\u7edf\u62a5\u8b66\u4e86\u3002\u3002\u3002\u8fd9\u4e2a\u76f8\u5173\u7684\u4e1a\u52a1\u8bf7\u6c42\u77ac\u95f4\u7279\u522b\u591a\uff0c\u76d1\u63a7\u7cfb\u7edf\u544a\u8b66OOM\u4e86\u3002<\/p>\n<\/blockquote>\n
    \u6240\u4ee5\u6211\u4eec\u4f7f\u7528\u7ebf\u7a0b\u6c60\u7684\u65f6\u5019\uff0c\u8fd8\u8981\u5f53\u5fc3\u7ebf\u7a0b\u521b\u5efa\u8fc7\u591a\uff0c\u5bfc\u81f4OOM<\/code>\u95ee\u9898\u3002\u5927\u5bb6\u5c3d\u91cf\u4e0d\u8981\u4f7f\u7528newCachedThreadPool<\/code>\uff0c\u5e76\u4e14\u5982\u679c\u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60\u65f6\uff0c\u8981\u6ce8\u610f\u4e00\u4e0b\u6700\u5927\u7ebf\u7a0b\u6570\u3002<\/strong><\/p>\n
    3. \u5171\u4eab\u7ebf\u7a0b\u6c60\uff0c\u6b21\u8981\u903b\u8f91\u62d6\u57ae\u4e3b\u8981\u903b\u8f91<\/span><\/h2>\n
    \u8981\u907f\u514d\u6240\u6709\u7684\u4e1a\u52a1\u903b\u8f91\u5171\u4eab\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u3002\u6bd4\u5982\u4f60\u7528\u7ebf\u7a0b\u6c60A\u6765\u505a\u767b\u5f55\u5f02\u6b65\u901a\u77e5\uff0c\u53c8\u7528\u7ebf\u7a0b\u6c60A\u6765\u505a\u5bf9\u8d26\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n