{"id":755,"date":"2024-03-07T15:36:50","date_gmt":"2022-11-13T10:55:55","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-threadlocal-%e7%a4%ba%e4%be%8b\/"},"modified":"2025-08-03T06:26:38","modified_gmt":"2025-08-02T22:26:38","slug":"java-threadlocal-%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-threadlocal-%e7%a4%ba%e4%be%8b\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3Java ThreadLocal\uff1a\u539f\u7406\u3001\u793a\u4f8b\u4e0e\u5e94\u7528\u573a\u666f"},"content":{"rendered":"<p>Java\u7684ThreadLocal\u7528\u4e8e\u521b\u5efa\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u3002\u5728Java\u4e2d\uff0c\u4e00\u4e2a\u5bf9\u8c61\u7684\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u5176\u53d8\u91cf\uff0c\u56e0\u6b64\u8fd9\u4e9b\u53d8\u91cf\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u867d\u7136\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u540c\u6b65\u673a\u5236\u6765\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\uff0c\u4f46\u5982\u679c\u5e0c\u671b\u907f\u514d\u540c\u6b65\u5e26\u6765\u7684\u6027\u80fd\u5f00\u9500\uff0c\u53ef\u4ee5\u4f7f\u7528ThreadLocal\u53d8\u91cf\u3002<\/p>\n<h2>Java \u7684 ThreadLocal<\/h2>\n<p>\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u62e5\u6709\u81ea\u5df1\u72ec\u7acb\u7684ThreadLocal\u53d8\u91cf\uff0c\u53ef\u4ee5\u901a\u8fc7get()\u548cset()\u65b9\u6cd5\u83b7\u53d6\u9ed8\u8ba4\u503c\u6216\u66f4\u6539\u5176\u503c\uff0c\u8fd9\u4e9b\u503c\u4ec5\u4e0e\u5f53\u524d\u7ebf\u7a0b\u5173\u8054\u3002ThreadLocal\u5b9e\u4f8b\u901a\u5e38\u4f5c\u4e3a\u5e0c\u671b\u5c06\u72b6\u6001\u4e0e\u7ebf\u7a0b\u76f8\u5173\u8054\u7684\u7c7b\u4e2d\u7684\u79c1\u6709\u9759\u6001\u5b57\u6bb5\u4f7f\u7528\u3002<\/p>\n<h3>Java\u4e2d\u7684ThreadLocal\u793a\u4f8b<\/h3>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5728Java\u7a0b\u5e8f\u4e2d\u4f7f\u7528ThreadLocal\uff0c\u5e76\u8bc1\u660e\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u62e5\u6709\u81ea\u5df1\u72ec\u7acb\u7684ThreadLocal\u53d8\u91cf\u526f\u672c\u3002ThreadLocalExample.java<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.threads;\r\n\r\nimport java.text.SimpleDateFormat;\r\nimport java.util.Random;\r\n\r\npublic class ThreadLocalExample implements Runnable{\r\n\r\n    \/\/ SimpleDateFormat\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u6240\u4ee5\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u63d0\u4f9b\u4e00\u4e2a\u5b9e\u4f8b\r\n    private static final ThreadLocal&lt;SimpleDateFormat&gt; formatter = new ThreadLocal&lt;SimpleDateFormat&gt;(){\r\n        @Override\r\n        protected SimpleDateFormat initialValue()\r\n        {\r\n            return new SimpleDateFormat(\"yyyyMMdd HHmm\");\r\n        }\r\n    };\r\n    \r\n    public static void main(String[] args) throws InterruptedException {\r\n        ThreadLocalExample obj = new ThreadLocalExample();\r\n        for(int i=0 ; i&lt;10; i++){\r\n            Thread t = new Thread(obj, \"\"+i);\r\n            Thread.sleep(new Random().nextInt(1000));\r\n            t.start();\r\n        }\r\n    }\r\n\r\n    @Override\r\n    public void run() {\r\n        System.out.println(\"\u7ebf\u7a0b\u540d\u79f0= \"+Thread.currentThread().getName()+\" \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = \"+formatter.get().toPattern());\r\n        try {\r\n            Thread.sleep(new Random().nextInt(1000));\r\n        } catch (InterruptedException e) {\r\n            e.printStackTrace();\r\n        }\r\n        \/\/\u6b64\u5904\u7ebf\u7a0b\u66f4\u6539\u4e86\u683c\u5f0f\u5316\u5668\u6a21\u5f0f\uff0c\u4f46\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u7ebf\u7a0b\r\n        formatter.set(new SimpleDateFormat());\r\n        \r\n        System.out.println(\"\u7ebf\u7a0b\u540d\u79f0= \"+Thread.currentThread().getName()+\" \u683c\u5f0f\u5316\u5668 = \"+formatter.get().toPattern());\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0Java ThreadLocal\u793a\u4f8b\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code>\u7ebf\u7a0b\u540d\u79f0= 0 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 1 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 0 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 2 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 1 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 3 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 4 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 4 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 5 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 2 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 3 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 6 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 5 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 6 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 7 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 8 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 8 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 7 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n\u7ebf\u7a0b\u540d\u79f0= 9 \u9ed8\u8ba4\u683c\u5f0f\u5316\u5668 = yyyyMMdd HHmm\r\n\u7ebf\u7a0b\u540d\u79f0= 9 \u683c\u5f0f\u5316\u5668 = M\/d\/yy h:mm a\r\n<\/code><\/pre>\n<p>\u4ece\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c\u7ebf\u7a0b0\u5df2\u7ecf\u66f4\u6539\u4e86\u683c\u5f0f\u5316\u7a0b\u5e8f\u7684\u503c\uff0c\u4f46\u7ebf\u7a0b2\u7684\u9ed8\u8ba4\u683c\u5f0f\u5316\u7a0b\u5e8f\u4ecd\u7136\u4fdd\u6301\u521d\u59cb\u503c\u3002\u5176\u4ed6\u7ebf\u7a0b\u4e5f\u8868\u73b0\u51fa\u76f8\u540c\u7684\u6a21\u5f0f\u3002\u66f4\u65b0\u8bf4\u660e\uff1aThreadLocal\u7c7b\u5728Java 8\u4e2d\u5f15\u5165\u4e86\u65b0\u7684withInitial()\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u63a5\u53d7Supplier\u51fd\u6570\u63a5\u53e3\u4f5c\u4e3a\u53c2\u6570\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u66f4\u7b80\u6d01\u5730\u521b\u5efaThreadLocal\u5b9e\u4f8b\u3002\u4f8b\u5982\uff0c\u4e0a\u8ff0formatter ThreadLocal\u53d8\u91cf\u53ef\u4ee5\u7b80\u5316\u4e3a\u4e00\u884c\u5b9a\u4e49\uff1a<\/p>\n<pre class=\"post-pre\"><code>private static final ThreadLocal&lt;SimpleDateFormat&gt; formatter = \r\n\tThreadLocal.&lt;SimpleDateFormat&gt;withInitial\r\n\t(() -&gt; {return new SimpleDateFormat(\"yyyyMMdd HHmm\");});\r\n<\/code><\/pre>\n<p>\u5982\u679c\u60a8\u5bf9Java 8\u7684\u7279\u6027\u8fd8\u4e0d\u719f\u6089\uff0c\u5efa\u8bae\u67e5\u9605Java 8\u7279\u6027\u76f8\u5173\u6587\u6863\u4ee5\u53caJava 8\u51fd\u6570\u63a5\u53e3\u7684\u8be6\u7ec6\u8bf4\u660e\u3002\u5173\u4e8eJava\u7f16\u7a0b\u4e2d\u7684ThreadLocal\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u3002\u53c2\u8003\u8d44\u6599\uff1aJava API\u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u7684ThreadLocal\u7528\u4e8e\u521b\u5efa\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u3002\u5728Java\u4e2d\uff0c\u4e00\u4e2a\u5bf9\u8c61\u7684\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u5176\u53d8\u91cf\uff0c\u56e0\u6b64\u8fd9\u4e9b\u53d8\u91cf [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1398,1397,2047],"class_list":{"0":"post-755","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","9":"tag-threadlocal"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast 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