{"id":1997,"date":"2025-06-14T19:06:46","date_gmt":"2025-06-14T11:06:46","guid":{"rendered":"https:\/\/note.ui11.cc\/?p=1997"},"modified":"2025-06-14T19:06:47","modified_gmt":"2025-06-14T11:06:47","slug":"%e7%ba%bf%e7%a8%8b%e6%b1%a0%e6%9c%ac%e8%ba%ab%e4%b8%8d%e4%bc%9a%e7%9b%b4%e6%8e%a5%e5%af%bc%e8%87%b4%e5%b9%b6%e5%8f%91%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98%ef%bc%8c%e4%bd%86%e5%a6%82%e6%9e%9c%e4%bd%bf","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2025\/06\/14\/%e7%ba%bf%e7%a8%8b%e6%b1%a0%e6%9c%ac%e8%ba%ab%e4%b8%8d%e4%bc%9a%e7%9b%b4%e6%8e%a5%e5%af%bc%e8%87%b4%e5%b9%b6%e5%8f%91%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98%ef%bc%8c%e4%bd%86%e5%a6%82%e6%9e%9c%e4%bd%bf\/","title":{"rendered":"\u7ebf\u7a0b\u6c60\u672c\u8eab\u4e0d\u4f1a\u76f4\u63a5\u5bfc\u81f4\u5e76\u53d1\u5b89\u5168\u95ee\u9898\uff0c\u4f46\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\uff0c\u7ebf\u7a0b\u6c60\u4e2d\u7684\u4efb\u52a1\u53ef\u80fd\u4f1a\u51fa\u73b0\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u5206\u6790\u548c\u5e94\u5bf9\u7b56\u7565\uff1a"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\"><strong>1. \u7ebf\u7a0b\u6c60\u4e0e\u5e76\u53d1\u5b89\u5168\u7684\u5173\u7cfb<\/strong><\/h3>\n\n\n\n<p>\u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u4f5c\u7528\u662f<strong>\u7ba1\u7406\u548c\u590d\u7528\u7ebf\u7a0b<\/strong>\uff0c\u5b83\u672c\u8eab\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff08\u5982<code>ThreadPoolExecutor<\/code>\u7684\u5185\u90e8\u5b9e\u73b0\u901a\u8fc7\u9501\u673a\u5236\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff09\u3002\u4f46\u7ebf\u7a0b\u6c60\u6267\u884c\u7684<strong>\u4efb\u52a1\u903b\u8f91<\/strong>\u5982\u679c\u6d89\u53ca<strong>\u5171\u4eab\u8d44\u6e90<\/strong>\u7684\u8bbf\u95ee\uff0c\u5c31\u53ef\u80fd\u5f15\u53d1\u5e76\u53d1\u95ee\u9898\u3002<\/p>\n\n\n\n<p><strong>\u5173\u952e\u70b9<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7ebf\u7a0b\u6c60\u53ea\u662f\u63d0\u4f9b\u6267\u884c\u73af\u5883\uff0c\u4e0d\u8d1f\u8d23\u4efb\u52a1\u5185\u90e8\u7684\u5e76\u53d1\u5b89\u5168\u3002<\/li>\n\n\n\n<li>\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\uff08\u5982\u9759\u6001\u53d8\u91cf\u3001\u6210\u5458\u53d8\u91cf\uff09\u65f6\uff0c\u9700\u624b\u52a8\u4fdd\u8bc1\u540c\u6b65\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. \u53ef\u80fd\u51fa\u73b0\u7684\u5e76\u53d1\u5b89\u5168\u95ee\u9898<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b 1\uff1a\u591a\u7ebf\u7a0b\u4fee\u6539\u5171\u4eab\u53d8\u91cf<\/h4>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class ThreadPoolSafetyDemo {\n    private static int counter = 0; \/\/ \u5171\u4eab\u53d8\u91cf\n\n    public static void main(String&#91;] args) throws InterruptedException {\n        ExecutorService executor = Executors.newFixedThreadPool(10);\n        \n        \/\/ \u63d0\u4ea41000\u4e2a\u4efb\u52a1\n        for (int i = 0; i &lt; 1000; i++) {\n            executor.submit(() -&gt; {\n                counter++; \/\/ \u975e\u539f\u5b50\u64cd\u4f5c\uff0c\u7ebf\u7a0b\u4e0d\u5b89\u5168\n            });\n        }\n        \n        executor.shutdown();\n        executor.awaitTermination(1, TimeUnit.SECONDS);\n        \n        System.out.println(\"Expected: 1000, Actual: \" + counter); \/\/ \u53ef\u80fd\u5c0f\u4e8e1000\n    }\n}\n<\/code><\/pre>\n\n\n\n<p><strong>\u95ee\u9898<\/strong>\uff1a<code>counter++<\/code>&nbsp;\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\uff0c\u5b58\u5728\u7ade\u6001\u6761\u4ef6\uff08Race Condition\uff09\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b 2\uff1a\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u5bf9\u8c61<\/h4>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class ThreadPoolSafetyDemo {\n    private static SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM-dd\"); \/\/ \u975e\u7ebf\u7a0b\u5b89\u5168\n\n    public static void main(String&#91;] args) {\n        ExecutorService executor = Executors.newFixedThreadPool(10);\n        \n        for (int i = 0; i &lt; 1000; i++) {\n            final int date = i;\n            executor.submit(() -&gt; {\n                try {\n                    sdf.parse(\"2023-\" + date % 12 + \"-\" + date % 30); \/\/ \u53ef\u80fd\u629b\u51fa\u5f02\u5e38\n                } catch (Exception e) {\n                    e.printStackTrace();\n                }\n            });\n        }\n        \n        executor.shutdown();\n    }\n}\n<\/code><\/pre>\n\n\n\n<p><strong>\u95ee\u9898<\/strong>\uff1a<code>SimpleDateFormat<\/code>&nbsp;\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u591a\u7ebf\u7a0b\u5171\u7528\u4f1a\u5bfc\u81f4\u89e3\u6790\u9519\u8bef\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. \u5982\u4f55\u4fdd\u8bc1\u7ebf\u7a0b\u6c60\u4e2d\u7684\u5e76\u53d1\u5b89\u5168\uff1f<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u65b9\u6cd5 1\uff1a\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u6570\u636e\u7ed3\u6784<\/h4>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private static AtomicInteger counter = new AtomicInteger(0); \/\/ \u539f\u5b50\u7c7b\n\nexecutor.submit(() -&gt; {\n    counter.incrementAndGet(); \/\/ \u539f\u5b50\u64cd\u4f5c\uff0c\u7ebf\u7a0b\u5b89\u5168\n});\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u65b9\u6cd5 2\uff1a\u540c\u6b65\u673a\u5236\uff08\u9501\uff09<\/h4>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private static final Object lock = new Object();\nprivate static int counter = 0;\n\nexecutor.submit(() -&gt; {\n    synchronized (lock) {\n        counter++; \/\/ \u540c\u6b65\u5757\uff0c\u7ebf\u7a0b\u5b89\u5168\n    }\n});\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u65b9\u6cd5 3\uff1a\u907f\u514d\u5171\u4eab\u72b6\u6001<\/h4>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>executor.submit(() -&gt; {\n    SimpleDateFormat localSdf = new SimpleDateFormat(\"yyyy-MM-dd\"); \/\/ \u5c40\u90e8\u53d8\u91cf\n    localSdf.parse(\"2023-01-01\"); \/\/ \u65e0\u5171\u4eab\uff0c\u7ebf\u7a0b\u5b89\u5168\n});\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u65b9\u6cd5 4\uff1a\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u5de5\u5177\u7c7b<\/h4>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u4f7f\u7528ThreadLocal\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u521b\u5efa\u72ec\u7acb\u7684SimpleDateFormat\u5b9e\u4f8b\nprivate static final ThreadLocal&lt;SimpleDateFormat&gt; threadLocalSdf = \n    ThreadLocal.withInitial(() -&gt; new SimpleDateFormat(\"yyyy-MM-dd\"));\n\nexecutor.submit(() -&gt; {\n    SimpleDateFormat sdf = threadLocalSdf.get(); \/\/ \u7ebf\u7a0b\u72ec\u4eab\n    sdf.parse(\"2023-01-01\");\n});\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. \u7ebf\u7a0b\u6c60\u914d\u7f6e\u5bf9\u5e76\u53d1\u7684\u5f71\u54cd<\/strong><\/h3>\n\n\n\n<p>\u7ebf\u7a0b\u6c60\u53c2\u6570\u8bbe\u7f6e\u4e0d\u5f53\u53ef\u80fd\u95f4\u63a5\u5bfc\u81f4\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6838\u5fc3\u7ebf\u7a0b\u6570 \/ \u6700\u5927\u7ebf\u7a0b\u6570\u8fc7\u5927<\/strong>\uff1a\u5bfc\u81f4\u8fc7\u591a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\uff0c\u589e\u52a0\u7ade\u4e89\u3002<\/li>\n\n\n\n<li><strong>\u4efb\u52a1\u961f\u5217\u8fc7\u957f<\/strong>\uff1a\u53ef\u80fd\u79ef\u538b\u5927\u91cf\u4efb\u52a1\uff0c\u5bfc\u81f4\u5185\u5b58\u6ea2\u51fa\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u4f18\u5316\u5efa\u8bae<\/strong>\uff1a<\/p>\n\n\n\n<p>java<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u6839\u636e\u4e1a\u52a1\u573a\u666f\u8c03\u6574\u7ebf\u7a0b\u6c60\u53c2\u6570\nThreadPoolExecutor executor = new ThreadPoolExecutor(\n    5,                          \/\/ \u6838\u5fc3\u7ebf\u7a0b\u6570\n    10,                         \/\/ \u6700\u5927\u7ebf\u7a0b\u6570\n    60, TimeUnit.SECONDS,       \/\/ \u7a7a\u95f2\u7ebf\u7a0b\u5b58\u6d3b\u65f6\u95f4\n    new LinkedBlockingQueue&lt;&gt;(100), \/\/ \u4efb\u52a1\u961f\u5217\u5927\u5c0f\n    Executors.defaultThreadFactory(),\n    new ThreadPoolExecutor.CallerRunsPolicy() \/\/ \u62d2\u7edd\u7b56\u7565\n);\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. \u9762\u8bd5\u5e94\u7b54\u8981\u70b9<\/strong><\/h3>\n\n\n\n<p><strong>\u95ee\u9898<\/strong>\uff1a\u7ebf\u7a0b\u6c60\u4e2d\u4f1a\u4e0d\u4f1a\u51fa\u73b0\u5e76\u53d1\u5b89\u5168\u95ee\u9898\uff1f<br><strong>\u53c2\u8003\u7b54\u6848<\/strong>\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7ebf\u7a0b\u6c60\u672c\u8eab\u662f\u7ebf\u7a0b\u5b89\u5168\u7684<\/strong>\uff0c\u4f46\u5176\u6267\u884c\u7684\u4efb\u52a1\u5982\u679c\u6d89\u53ca\u5171\u4eab\u8d44\u6e90\uff08\u5982\u9759\u6001\u53d8\u91cf\u3001\u6210\u5458\u53d8\u91cf\uff09\uff0c\u53ef\u80fd\u51fa\u73b0\u5e76\u53d1\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u95ee\u9898<\/strong>\uff1a\u7ade\u6001\u6761\u4ef6\u3001\u6570\u636e\u4e0d\u4e00\u81f4\u3001\u5bf9\u8c61\u72b6\u6001\u5f02\u5e38\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u89e3\u51b3\u65b9\u6cd5<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u7ebf\u7a0b\u5b89\u5168\u7684\u6570\u636e\u7ed3\u6784\uff08\u5982<code>AtomicInteger<\/code>\u3001<code>ConcurrentHashMap<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u52a0\u9501\uff08<code>synchronized<\/code>\u3001<code>ReentrantLock<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u907f\u514d\u5171\u4eab\u72b6\u6001\uff08\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u6216<code>ThreadLocal<\/code>\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7ebf\u7a0b\u6c60\u914d\u7f6e\u4f18\u5316<\/strong>\uff1a\u6839\u636e\u4e1a\u52a1\u8c03\u6574\u7ebf\u7a0b\u6570\u548c\u961f\u5217\u5927\u5c0f\uff0c\u907f\u514d\u8d44\u6e90\u8017\u5c3d\u3002<\/li>\n<\/ol>\n\n\n\n<p><strong>\u793a\u4f8b<\/strong>\uff1a\u5728\u67d0\u9879\u76ee\u4e2d\uff0c\u6211\u4eec\u66fe\u56e0\u591a\u7ebf\u7a0b\u5171\u7528<code>SimpleDateFormat<\/code>\u5bfc\u81f4\u89e3\u6790\u9519\u8bef\uff0c\u901a\u8fc7<code>ThreadLocal<\/code>\u4fee\u590d\u4e86\u8be5\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u7ebf\u7a0b\u6c60\u4e0e\u5e76\u53d1\u5b89\u5168\u7684\u5173\u7cfb \u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u4f5c\u7528\u662f\u7ba1\u7406\u548c\u590d\u7528\u7ebf\u7a0b\uff0c\u5b83\u672c\u8eab\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff08\u5982ThreadPoolEx [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1997","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1997","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/comments?post=1997"}],"version-history":[{"count":1,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1997\/revisions"}],"predecessor-version":[{"id":1998,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1997\/revisions\/1998"}],"wp:attachment":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/media?parent=1997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/categories?post=1997"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/tags?post=1997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}