{"id":10008222,"date":"2023-09-04T11:59:14","date_gmt":"2023-09-04T03:59:14","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008222"},"modified":"2023-09-04T11:59:14","modified_gmt":"2023-09-04T03:59:14","slug":"threadlocal%ef%bc%9a%e7%ba%bf%e7%a8%8b%e4%b8%ad%e7%9a%84%e5%85%a8%e5%b1%80%e5%8f%98%e9%87%8f-%e4%ba%ac%e4%b8%9c%e4%ba%91%e6%8a%80%e6%9c%af%e5%9b%a2%e9%98%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008222","title":{"rendered":"ThreadLocal\uff1a\u7ebf\u7a0b\u4e2d\u7684\u5168\u5c40\u53d8\u91cf | \u4eac\u4e1c\u4e91\u6280\u672f\u56e2\u961f"},"content":{"rendered":"

\u6700\u8fd1\u63a5\u4e86\u4e00\u4e2a\u65b0\u9700\u6c42\uff0c\u4e1a\u52a1\u573a\u666f\u4e0a\u9700\u8981\u5728\u539f\u6709\u57fa\u7840\u4e0a\u65b0\u589e2\u4e2a\u5b57\u6bb5\uff0c\u63a5\u53e3\u65b0\u589e\u53c2\u6570\u610f\u5473\u7740\u5f88\u591a\u7c7b\u548c\u65b9\u6cd5\u7684\u903b\u8f91\u90fd\u9700\u8981\u6539\u53d8\uff0c\u9700\u8981\u5148\u5224\u65ad\u662f\u5426\u5c5e\u4e8e\u8be5\u4e1a\u52a1\u573a\u666f\uff0c\u518d\u505a\u5bf9\u5e94\u7684\u903b\u8f91\u3002\u539f\u672c\u7684\u6253\u7b97\u662f\u5728\u5165\u53e3\u5904\u65b0\u589e\u53d8\u91cf\uff0c\u5728\u64cd\u4f5c\u6570\u636e\u7684\u65f6\u5019\u8fdb\u884c\u903b\u8f91\u5224\u65ad\u5c06\u53d8\u91cf\u8fdb\u884c\u5b58\u50a8\u6216\u67e5\u8be2\u3002<\/p>\n

\u5982\u679c\u5168\u94fe\u8def\u90fd\u53d8\u66f4\u5165\u53c2\u548c\u7ed3\u6784\uff0c\u5f88\u660e\u663e\u4ee3\u7801\u4e0a\u5f88\u4e0d\u4f18\u96c5\uff0c\u540e\u7eed\u5982\u679c\u8fd8\u8981\u589e\u52a0\u4e1a\u52a1\u573a\u666f\uff0c\u53c8\u9700\u8981\u518d\u6539\u4e00\u904d\u3002\u5982\u679c\u6709\u4e00\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u4f20\u9012\u5168\u5c40\u53d8\u91cf\uff0c\u800c\u4e14\u4ec5\u9650\u4e8e\u5f53\u524d\u7ebf\u7a0b\u5c31\u597d\u4e86\u3002<\/p>\n

\u5230\u6b64\uff0c\u4f1a\u60f3\u5230\u6709\u4e24\u79cd\u89e3\u51b3\u65b9\u6848\uff1a\u4e4b\u524d\u7528\u7684\u6bd4\u8f83\u5c11\u7684ThreadLocal\u6216\u8005\u4f7f\u7528redis\u7f13\u5b58\u3002\u8003\u8651\u5230\u65b0\u589e\u5b57\u6bb5\u90fd\u662f\u4e9b\u589e\u5220\u6539\u67e5\u7684\u64cd\u4f5c\uff0c\u6ca1\u6709\u5fc5\u8981\u5b58\u5230redis\u4e2d\uff0c\u6545\u4f7f\u7528ThreadLocal\u3002<\/p>\n

\u4e00\u3001ThreadLocal\u5b9a\u4e49<\/strong><\/h2>\n

\u4ee5\u5fae\u670d\u52a1\u67b6\u6784\u4e3a\u4f8b\uff0c\u670d\u52a1\u63d0\u4f9b\u65b9\u5728\u6536\u5230\u8c03\u7528\u65b9\u7684\u8bf7\u6c42\u540e\uff0c\u4f1a\u628a\u8fd9\u4e2a\u8bf7\u6c42\u5206\u914d\u7ed9\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u884c\u5904\u7406\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u4e00\u4e2a\u8bf7\u6c42\u4f1a\u4e00\u76f4\u7531\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5904\u7406\uff0c\u4e2d\u95f4\u4e0d\u4f1a\u5207\u6362\u7ebf\u7a0b\uff0c\u6240\u4ee5\u5982\u679c\u6709\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u5171\u4eab\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u5f53\u5168\u5c40\u53d8\u91cf\u4f7f\u7528\u3002<\/p>\n

ThreadLocal\u5b9e\u73b0\u7684\u5c31\u662f\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u7684\u5168\u5c40\u53d8\u91cf\uff0c\u4e0e\u771f\u6b63\u7684\u5168\u5c40\u53d8\u91cf\u7684\u533a\u522b\u5728\u4e8eThreadLocal\u7684\u53d8\u91cf\u662f\u6bcf\u4e2a\u7ebf\u7a0b\u4e2d\u7684\u5168\u5c40\u53d8\u91cf\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e0d\u540c\u7ebf\u7a0b\u8bbf\u95ee\u5230\u7684\u503c\u662f\u4e0d\u4e00\u6837\u7684\u3002\u5176\u586b\u5145\u7684\u53d8\u91cf\u5c5e\u4e8e\u5f53\u524d\u7ebf\u7a0b\uff0c\u8be5\u53d8\u91cf\u5bf9\u4e8e\u5176\u4ed6\u7ebf\u7a0b\u662f\u9694\u79bb\u7684\u3002<\/p>\n

\u7531\u5b9a\u4e49\u53ef\u4ee5\u53d1\u73b0\uff0cThreadLocal\u6709\u4e24\u4e2a\u7279\u6027\uff1a\u6bcf\u4e2aThread\u7684\u53d8\u91cf\u53ea\u80fd\u7531\u5f53\u524dThread\u4f7f\u7528\uff1b\u7531\u4e8e\u5176\u4ed6\u7ebf\u7a0b\u4e0d\u53ef\u8bbf\u95ee\uff0c\u5219\u4e0d\u5b58\u5728\u591a\u7ebf\u7a0b\u95f4\u5171\u4eab\u7684\u95ee\u9898\u3002<\/p>\n

\u4e8c\u3001\u4fee\u9970<\/strong><\/h2>\n

ThreadLocal\u63d0\u4f9b\u4e86\u7ebf\u7a0b\u672c\u5730\u7684\u5b9e\u4f8b\uff0c\u5b83\u4e0e\u666e\u901a\u53d8\u91cf\u7684\u533a\u522b\u5728\u4e8e\uff0c\u6bcf\u4e2a\u4f7f\u7528\u8be5\u53d8\u91cf\u7684\u7ebf\u7a0b\u90fd\u4f1a\u521d\u59cb\u5316\u4e00\u4e2a\u5b8c\u5168\u72ec\u7acb\u7684\u5b9e\u4f8b\u526f\u672c\u3002<\/p>\n

ThreadLocal\u53d8\u91cf\u901a\u5e38\u88abprivate static\u4fee\u9970\uff0c\u8fd9\u6837\u7684\u597d\u5904\u662f\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u7ed3\u675f\u65f6\uff0c\u5b83\u6240\u4f7f\u7528\u7684ThreadLocal\u5b9e\u4f8b\u526f\u672c\u90fd\u53ef\u88ab\u56de\u6536\uff0c\u907f\u514d\u91cd\u590d\u521b\u5efa\u3002\u574f\u5904\u5c31\u662f\u8fd9\u6837\u505a\u53ef\u80fd\u6b63\u597d\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n

\u4e09\u3001\u5e95\u5c42\u5b9e\u73b0<\/strong><\/h2>\n

ThreadLocal\u6700\u6734\u7d20\u7684\u5185\u90e8\u5b9e\u73b0\u662fMap<threadlocal, Object>\uff0c\u8fd9\u662f\u4e00\u4e2aHashMap\uff0c\u53c8\u79f0\u4e3aThreadLocalMap\u3002\u4f46Java\u6e90\u7801\u5e76\u4e0d\u662fMap<threadlocal, Object>\u7684\u5b9e\u73b0\u3002\u8fd9\u662f\u56e0\u4e3a\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u4e2amap\uff0c\u8fd9\u4e2amap\u9700\u8981\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u6784\u9020\u6bd4\u8f83\u9ebb\u70e6\u3002Java\u91c7\u7528\u4e86\u66f4\u7b80\u5355\u7c97\u66b4\u7684\u505a\u6cd5\uff1a\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684ThreadLocal\u4e13\u5c5emap\uff0c\u91cc\u9762\u53ef\u4ee5\u5b58\u653e\u591a\u4e2aThreadLocal\u53d8\u91cf\uff0c\u8fd9\u6837\u5c31\u89e3\u51b3\u4e86\u591a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c\u4e00\u4e2amap\u5e26\u6765\u7684\u591a\u7ebf\u7a0b\u5e76\u53d1\u95ee\u9898\u3002<\/p>\n

\u56e0\u4e3a\u8981\u628aThreadLocal\u7684\u53d8\u91cf\u5f53\u505a\u5168\u5c40\u53d8\u91cf\u4f7f\u7528\uff0c\u9700\u8981\u628a\u53d8\u91cf\u4e0e\u521d\u59cb\u5316\u51fd\u6570\u5199\u5728\u901a\u7528\u7684\u7c7b\u4e2d\uff0c\u5982DDD\u9886\u57df\u6a21\u578b\u4e2d\u5199\u5728Common\u6a21\u5757\u3002<\/p>\n

\u5177\u4f53\u7684\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n

public class ThreadLocalUtil {\n \n   private static ThreadLocal<Integer> THREAD_LOCAL = new ThreadLocal<>();\n\n\n   public static Integer getScene() {\n       return THREAD_LOCAL.get();\n   }\n\n   public static void initScene(Integer scene) {\n       if (THREAD_LOCAL == null) {\n           THREAD_LOCAL = new ThreadLocal<>();\n       }\n       THREAD_LOCAL.set(scene);\n   }\n\n   public static void remove() {\n       THREAD_LOCAL.remove();\n   }\n}\n<\/code><\/pre>\n
\u56db\u3001\u81f4\u547d\u70b9<\/h2>\n
\u4e0a\u9762\u63d0\u5230\u4e86\u7684ThreadLocal\u4f1a\u5e26\u6765\u5185\u5b58\u6cc4\u9732\u7684\u95ee\u9898\uff0c\u6df1\u5165\u5206\u6790\u4e0b\uff1a<\/p>\n
\u4e00\u4e2aThreadLocal\u5b9e\u4f8b\u5bf9\u5e94\u5f53\u524d\u7ebf\u7a0b\u7684\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u5982\u679c\u628aThreadLocal\u58f0\u660e\u4e3a\u67d0\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u53d8\u91cf\u4e0d\u662f\u9759\u6001\u53d8\u91cf\uff0c\u90a3\u4e48\u6bcf\u6b21\u521b\u5efa\u4e00\u4e2a\u8be5\u7c7b\u7684\u5b9e\u4f8b\u5c31\u4f1a\u5bfc\u81f4\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u5b9e\u4f8b\u88ab\u521b\u5efa\u3002\u800c\u8fd9\u4e9b\u88ab\u521b\u5efa\u7684\u5b9e\u4f8b\u662f\u540c\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff0c\u4e8e\u662f\u540c\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u4f1a\u8bbf\u95ee\u5230\u540c\u4e00\u4e2a\u7c7b\u7684\u4e0d\u540c\u5b9e\u4f8b\uff0c\u8fd9\u5373\u4f7f\u4e0d\u4f1a\u5bfc\u81f4\u9519\u8bef\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u91cd\u590d\u521b\u5efa\u540c\u6837\u7684\u5bf9\u8c61\u3002\u5982\u679c\u4f7f\u7528static\u4fee\u9970\u540e\uff0c\u53ea\u8981\u76f8\u5e94\u7684\u7c7b\u6ca1\u6709\u88ab\u5783\u573e\u56de\u6536\u6389\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7c7b\u5c31\u4f1a\u6301\u6709\u76f8\u5bf9\u5e94\u7684ThreadLocal\u5b9e\u4f8b\u5f15\u7528\u3002<\/p>\n
\"\"<\/p>\n
ThreadLocal\u81ea\u8eab\u5e76\u4e0d\u5b58\u50a8\u503c\uff0c\u800c\u662f\u4f5c\u4e3a\u4e00\u4e2akey\u6765\u8ba9\u7ebf\u7a0b\u4eceThreadLocal\u4e2d\u83b7\u53d6value\u3002ThreadLocalMap\u4e2d\u7684key\u662f\u5f31\u5f15\u7528\uff0c\u6240\u4ee5jvm\u5728\u5783\u573e\u56de\u6536\u65f6\u5982\u679c\u5916\u90e8\u6ca1\u6709\u5f3a\u5f15\u7528\u6765\u5f15\u7528\u5b83\uff0cThreadLocal\u5fc5\u7136\u4f1a\u88ab\u56de\u6536\u3002\u4f46\u662f\uff0c\u4f5c\u4e3aThreadLocalMap\u4e2d\u7684key\uff0cThreadLocal\u88ab\u56de\u6536\u540e\uff0cThreadLocalMap\u5c31\u4f1a\u5b58\u5728null\uff0c\u4f46value\u5374\u4e0d\u4e3anull\u3002\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u4e00\u76f4\u4e0d\u7ed3\u675f\u6216\u8005\u7ebf\u7a0b\u7ed3\u675f\u540e\u4e0d\u88ab\u4f60\u9500\u6bc1\uff0c\u8fd9\u4f1a\u4ea7\u751f\u5185\u5b58\u6cc4\u9732\uff08\u5df2\u5206\u914d\u7a7a\u95f4\u7684\u5806\u5185\u5b58\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u672a\u91ca\u653e\u6216\u65e0\u6cd5\u91ca\u653e\u5bfc\u81f4\u7cfb\u7edf\u5185\u5b58\u6d6a\u8d39\u6216\u7a0b\u5e8f\u8fd0\u884c\u53d8\u6162\u751a\u81f3\u7cfb\u7edf\u5954\u6e83\uff09\u3002<\/p>\n
\u56e0\u6b64\uff0ckey\u5f31\u5f15\u7528\u5e76\u4e0d\u662f\u5bfc\u81f4\u5185\u5b58\u6cc4\u9732\u7684\u539f\u56e0\uff0c\u800c\u662f\u56e0\u4e3aThreadLocalMap\u7684\u751f\u547d\u5468\u671f\u4e0e\u5f53\u524d\u7ebf\u7a0b\u4e00\u6837\u957f\uff0c\u5e76\u4e14\u6ca1\u6709\u624b\u52a8\u5220\u9664\u5bf9\u5e94\u7684value<\/strong>\u3002<\/p>\n
\u89e3\u51b3\u7684\u65b9\u6cd5\u4e5f\u5f88\u7b80\u5355\uff0c\u53ea\u9700\u8981\u6253\u7834\u5f15\u7528\u8def\u5f84\u4e2d\u7684ThreadLocalMap\u5bf9\u5bf9\u8c61\u5b9e\u4f8b\u7684\u5f15\u7528\u5373\u53ef\u3002\u4e5f\u5c31\u662f\u5728\u4f7f\u7528\u5b8cThreadLocal\u4e4b\u540e\uff0c\u5fc5\u987b\u8c03\u7528ThreadLocal.remove()\u3002<\/p>\n
\u5ef6\u4f38\uff1a<\/strong><\/h2>\n
\u4e3a\u4ec0\u4e48\u8981\u5c06Map\u4e2d\u7684key\u8bbe\u7f6e\u4e3a\u5f31\u5f15\u7528\u5462\uff1f<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u8bbe\u7f6ekey\u4e3a\u5f31\u5f15\u7528\u80fd\u9884\u9632\u5927\u591a\u6570\u5185\u5b58\u6cc4\u9732\u7684\u60c5\u51b5\u3002\u5982\u679ckey\u4f7f\u7528\u5f3a\u5f15\u7528\uff0c\u5f15\u7528\u7684ThreadLocal\u5bf9\u8c61\u88ab\u56de\u6536\uff0c\u4f46\u662fThreadLocalMap\u8fd8\u6301\u6709ThreadLocal\u7684\u5f3a\u5f15\u7528\uff0c\u5982\u679c\u6ca1\u6709\u624b\u52a8\u5220\u9664\uff0cThreadLocal\u4e0d\u4f1a\u88ab\u56de\u6536\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u5185\u5b58\u6cc4\u9732\u3002\u8bbe\u7f6e\u4e3a\u5f31\u5f15\u7528\u540e\uff0c\u5f15\u7528\u7684ThreadLocal\u5bf9\u8c61\u88ab\u56de\u6536\uff0c\u7531\u4e8eThreadLocalMap\u6301\u6709ThreadLocal\u7684\u5f31\u5f15\u7528\uff0c\u5373\u4f7f\u6ca1\u6709\u624b\u52a8\u5220\u9664\uff0cThreadLocal\u4e5f\u4f1a\u88abjava GC\u56de\u6536\u3002value\u5728\u4e0b\u4e00\u6b21ThreadLocalMap\u8c03\u7528set\u3001get\u3001remove\u7684\u65f6\u5019\u4f1a\u88ab\u6e05\u9664\u3002<\/p>\n
\u53c2\u8003\u6587\u7ae0\uff1a<\/p>\n
https:\/\/www.cnblogs.com\/tiancai\/p\/13141234.html?ivk_sa=1024320u<\/a><\/p>\n
https:\/\/last2win.com\/2020\/09\/05\/java-threadlocal\/<\/a><\/p>\n
https:\/\/blog.csdn.net\/u010445301\/article\/details\/111322569<\/a><\/p>\n
\n
\u4f5c\u8005\uff1a\u4eac\u4e1c\u96f6\u552e \u674e\u6cfd\u9633<\/p>\n
\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a \u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u6e90<\/p>\n<\/blockquote>\n
https:\/\/segmentfault.com\/a\/1190000044178523<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\u63a5\u4e86\u4e00\u4e2a\u65b0\u9700\u6c42\uff0c\u4e1a\u52a1\u573a\u666f\u4e0a\u9700\u8981\u5728\u539f\u6709\u57fa\u7840\u4e0a\u65b0\u589e2\u4e2a\u5b57\u6bb5\uff0c\u63a5\u53e3\u65b0\u589e\u53c2\u6570\u610f\u5473\u7740\u5f88\u591a\u7c7b\u548c\u65b9\u6cd5\u7684\u903b\u8f91\u90fd\u9700\u8981\u6539\u53d8\uff0c\u9700 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008222","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008222","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008222"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008222\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008222"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008222"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008222"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}