{"id":3651,"date":"2025-04-26T18:34:30","date_gmt":"2025-04-26T10:34:30","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3651"},"modified":"2025-04-26T18:34:30","modified_gmt":"2025-04-26T10:34:30","slug":"java-%e7%ba%bf%e7%a8%8b%e6%b1%a0%e5%b8%b8%e8%a7%81%e9%9d%a2%e8%af%95%e5%9d%91%e7%82%b9%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/26\/java-%e7%ba%bf%e7%a8%8b%e6%b1%a0%e5%b8%b8%e8%a7%81%e9%9d%a2%e8%af%95%e5%9d%91%e7%82%b9%e6%80%bb%e7%bb%93\/","title":{"rendered":"Java \u7ebf\u7a0b\u6c60\u5e38\u89c1\u9762\u8bd5\u5751\u70b9\u603b\u7ed3"},"content":{"rendered":"\n<p>\u672c\u7ae0\u8282\u6574\u7406\u4e00\u4efd\u8d85\u5b9e\u7528\u7684\u300a\u7ebf\u7a0b\u6c60\u9762\u8bd5\u5751\u70b9\u300b\uff0c\u65b9\u4fbf<strong>\u5feb\u901f\u8bb0\u5fc6<\/strong>\uff0c\u5982\u679c\u5728\u73b0\u573a\u8bb2\u51fa\u6765\u5c31\u4f1a\u663e\u5f97\u53c8\u4e13\u4e1a\u53c8\u9ad8\u6548\uff01<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u4e3a\u4ec0\u4e48\u4e0d\u63a8\u8350\u76f4\u63a5\u4f7f\u7528 <code>Executors<\/code> \u521b\u5efa\u7ebf\u7a0b\u6c60\uff1f<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u56e0\u4e3a <code>Executors<\/code> \u5de5\u5177\u7c7b\uff08\u5982 <code>newFixedThreadPool<\/code>\u3001<code>newCachedThreadPool<\/code>\uff09\u9ed8\u8ba4\u4f7f\u7528\u7684\u961f\u5217\u662f\u65e0\u754c\u7684\uff0c\u6bd4\u5982 <code>LinkedBlockingQueue<\/code>\uff0c\u8fd9\u6837\u5728\u9ad8\u5e76\u53d1\u60c5\u51b5\u4e0b\u5bb9\u6613\u5bfc\u81f4\u5185\u5b58\u8017\u5c3d\uff08OOM\uff09\uff0c\u4ece\u800c\u5f15\u53d1\u7cfb\u7edf\u5d29\u6e83\u3002<\/p>\n\n\n\n<p>\u6b63\u786e\u505a\u6cd5\u662f<strong>\u624b\u52a8\u4f7f\u7528 <code>ThreadPoolExecutor<\/code><\/strong>\uff0c\u5e76\u4e14<strong>\u5408\u7406\u8bbe\u7f6e\u6838\u5fc3\u53c2\u6570<\/strong>\uff08\u6838\u5fc3\u7ebf\u7a0b\u6570\u3001\u6700\u5927\u7ebf\u7a0b\u6570\u3001\u961f\u5217\u5bb9\u91cf\u3001\u62d2\u7edd\u7b56\u7565\u7b49\uff09\u3002<\/p>\n<\/blockquote>\n\n\n\n<p><strong>\u4e00\u53e5\u8bdd\u8bb0\u5fc6\u7248\uff1a<\/strong><br>\u2705 &#8220;Executors \u9690\u60a3\u5927\uff0cThreadPoolExecutor \u53ef\u63a7\u3001\u5b89\u5168\u3002&#8221;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u5982\u4f55\u81ea\u5b9a\u4e49 <code>ThreadPoolExecutor<\/code> \uff1f<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ThreadPoolExecutor executor = new ThreadPoolExecutor(\n    corePoolSize,    \/\/ \u6838\u5fc3\u7ebf\u7a0b\u6570\n    maximumPoolSize, \/\/ \u6700\u5927\u7ebf\u7a0b\u6570\n    keepAliveTime,   \/\/ \u7a7a\u95f2\u7ebf\u7a0b\u6700\u5927\u5b58\u6d3b\u65f6\u95f4\n    TimeUnit.SECONDS,\/\/ \u65f6\u95f4\u5355\u4f4d\n    workQueue,       \/\/ \u963b\u585e\u961f\u5217\n    threadFactory,   \/\/ \u7ebf\u7a0b\u5de5\u5382\n    handler          \/\/ \u62d2\u7edd\u7b56\u7565\n);<\/code><\/pre>\n\n\n\n<p>\u4e00\u822c\u63a8\u8350\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u963b\u585e\u961f\u5217\u7528 <code>ArrayBlockingQueue<\/code>\uff08\u6709\u754c\uff09<\/li>\n\n\n\n<li>\u62d2\u7edd\u7b56\u7565\u6839\u636e\u4e1a\u52a1\u9009\u5b9a\uff08\u6bd4\u5982\u9ed8\u8ba4\u629b\u5f02\u5e38\u3001CallerRunsPolicy\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u5e38\u89c1\u7684\u7ebf\u7a0b\u6c60\u62d2\u7edd\u7b56\u7565\u6709\u54ea\u4e9b\uff1f\u5e94\u7528\u573a\u666f\u662f\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7b56\u7565<\/th><th>\u8bf4\u660e<\/th><th>\u9002\u7528\u573a\u666f\u793a\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>AbortPolicy\uff08\u9ed8\u8ba4\uff09<\/td><td>\u76f4\u63a5\u629b\u5f02\u5e38\uff0c\u4efb\u52a1\u88ab\u62d2\u7edd<\/td><td>\u5bf9\u5b9e\u65f6\u6027\u8981\u6c42\u975e\u5e38\u9ad8\u7684\u7cfb\u7edf<\/td><\/tr><tr><td>CallerRunsPolicy<\/td><td>\u63d0\u4ea4\u4efb\u52a1\u7ebf\u7a0b\u81ea\u5df1\u6267\u884c<\/td><td>\u53ef\u4ee5\u964d\u7ea7\u5904\u7406\uff0c\u4fdd\u62a4\u7ebf\u7a0b\u6c60<\/td><\/tr><tr><td>DiscardPolicy<\/td><td>\u76f4\u63a5\u4e22\u5f03\u65b0\u63d0\u4ea4\u7684\u4efb\u52a1<\/td><td>\u53ef\u5bb9\u5fcd\u5c11\u91cf\u4efb\u52a1\u4e22\u5931\u7684\u573a\u666f<\/td><\/tr><tr><td>DiscardOldestPolicy<\/td><td>\u4e22\u5f03\u6700\u8001\u7684\u6392\u961f\u4efb\u52a1\uff0c\u6267\u884c\u65b0\u4efb\u52a1<\/td><td>\u4fdd\u8bc1\u65b0\u8bf7\u6c42\u4f18\u5148\u573a\u666f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u4e00\u53e5\u8bdd\u8bb0\u5fc6\u7248\uff1a<\/strong><br>\u2705 &#8220;Abort \u629b\u5f02\u5e38\uff0cCaller \u81ea\u5df1\u5e72\uff0cDiscard \u6254\u6389\u4efb\u52a1\uff0cDiscardOldest \u6254\u6700\u8001\u7684\u3002&#8221;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u5982\u4f55\u914d\u7f6e\u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u53c2\u6570\uff1f\uff08\u518d\u5f3a\u5316\u4e00\u904d\uff09<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CPU \u5bc6\u96c6\u578b \u2794 \u6838\u5fc3\u7ebf\u7a0b\u6570 = CPU \u6838\u6570 + 1<\/li>\n\n\n\n<li>IO \u5bc6\u96c6\u578b \u2794 \u6838\u5fc3\u7ebf\u7a0b\u6570 = 2 * CPU \u6838\u6570\uff08\u6216\u66f4\u591a\uff09<\/li>\n\n\n\n<li>\u961f\u5217\u5927\u5c0f \u2794 \u6839\u636e\u4e1a\u52a1\u91cf\u8bc4\u4f30\uff08\u6709\u754c\u961f\u5217\uff01\uff09<\/li>\n\n\n\n<li>\u6700\u5927\u7ebf\u7a0b\u6570 \u2794 \u4e00\u822c\u662f\u6838\u5fc3\u7ebf\u7a0b\u6570\u7684 1.5\uff5e2 \u500d<\/li>\n\n\n\n<li>\u62d2\u7edd\u7b56\u7565 \u2794 \u4e1a\u52a1\u7279\u70b9\u51b3\u5b9a\uff08\u5b9e\u65f6\u6027\u9ad8\u5c31\u629b\u5f02\u5e38\uff0c\u53ef\u964d\u7ea7\u5c31 CallerRuns\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u7ebf\u7a0b\u6c60\u4ec0\u4e48\u65f6\u5019\u9002\u5408\u7528\u56fa\u5b9a\u7ebf\u7a0b\u6c60 (<code>FixedThreadPool<\/code>)\uff1f<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4efb\u52a1\u6570\u91cf\u53ef\u63a7\u4e14\u6267\u884c\u65f6\u95f4\u8f83\u957f\u3002<\/li>\n\n\n\n<li>\u7cfb\u7edf\u8d1f\u8f7d\u6bd4\u8f83\u7a33\u5b9a\u3002<\/li>\n\n\n\n<li>\u6bd4\u5982\u540e\u53f0\u90ae\u4ef6\u53d1\u9001\u3001\u65e5\u5fd7\u5904\u7406\u7b49\u56fa\u5b9a\u4efb\u52a1\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u4e00\u53e5\u8bdd\u8bb0\u5fc6\u7248\uff1a<\/strong><br>\u2705 &#8220;\u4efb\u52a1\u7a33\u5b9a\u3001\u6267\u884c\u6162\uff0cFixedThreadPool \u521a\u521a\u597d\u3002&#8221;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. \u4ec0\u4e48\u573a\u666f\u9002\u5408\u7528\u7f13\u5b58\u7ebf\u7a0b\u6c60 (<code>CachedThreadPool<\/code>)\uff1f<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u77ed\u671f\u5927\u91cf\u5e76\u53d1\u4efb\u52a1\u3001\u6267\u884c\u65f6\u95f4\u77ed\u3002<\/li>\n\n\n\n<li>\u5982\u5904\u7406\u5927\u91cf\u77ed\u5c0f\u7684\u5f02\u6b65\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u98ce\u9669\u63d0\u9192\uff1a<\/strong> CachedThreadPool \u65e0\u754c\u7ebf\u7a0b\u6570 \u2794 \u5bb9\u6613 OOM\uff0c\u8981\u5c0f\u5fc3\u7528\uff01<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. \u7ebf\u7a0b\u6c60\u7684\u6838\u5fc3\u7ebf\u7a0b\u6570\u53ef\u4ee5\u56de\u6536\u5417\uff1f<\/h2>\n\n\n\n<p><strong>\u7b54\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ed8\u8ba4\u6838\u5fc3\u7ebf\u7a0b\u4e0d\u4f1a\u56de\u6536\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u8c03\u7528 <code>allowCoreThreadTimeOut(true)<\/code>\uff0c\u5373\u4f7f\u662f\u6838\u5fc3\u7ebf\u7a0b\uff0c\u7a7a\u95f2\u65f6\u95f4\u8d85\u8fc7 <code>keepAliveTime<\/code> \u4e5f\u4f1a\u88ab\u56de\u6536\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u6700\u540e\u9644\u9001\u4e00\u53e5\u4e07\u80fd\u6536\u5c3e\u56de\u7b54\uff08\u9762\u8bd5\u538b\u8f74\uff09<\/h1>\n\n\n\n<p>\u5f53\u9762\u8bd5\u5b98\u95ee\u5230\u7ebf\u7a0b\u6c60\u76f8\u5173\u4efb\u4f55\u95ee\u9898\u6700\u540e\u7ed3\u5c3e\u65f6\uff0c\u53ef\u4ee5\u7528\u4e0b\u9762\u8fd9\u53e5\u603b\u7ed3\uff0c\u8d85\u7ea7\u52a0\u5206\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#8220;\u5728\u9ad8\u5e76\u53d1\u7cfb\u7edf\u4e2d\uff0c\u7ebf\u7a0b\u6c60\u662f\u8d44\u6e90\u9694\u79bb\u548c\u8d1f\u8f7d\u4fdd\u62a4\u7684\u91cd\u8981\u624b\u6bb5\uff0c\u5408\u7406\u914d\u7f6e\u7ebf\u7a0b\u6c60\u53c2\u6570\uff0c\u7ed3\u5408\u9650\u6d41\u3001\u7194\u65ad\u3001\u964d\u7ea7\u7b49\u673a\u5236\uff0c\u53ef\u4ee5\u6709\u6548\u4fdd\u969c\u7cfb\u7edf\u7a33\u5b9a\u6027\u548c\u9ad8\u53ef\u7528\u6027\u3002&#8221;<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u7ae0\u8282\u6574\u7406\u4e00\u4efd\u8d85\u5b9e\u7528\u7684\u300a\u7ebf\u7a0b\u6c60\u9762\u8bd5\u5751\u70b9\u300b\uff0c\u65b9\u4fbf\u5feb\u901f\u8bb0\u5fc6\uff0c\u5982\u679c\u5728\u73b0\u573a\u8bb2\u51fa\u6765\u5c31\u4f1a\u663e\u5f97\u53c8\u4e13\u4e1a\u53c8\u9ad8\u6548\uff01 1. \u4e3a\u4ec0\u4e48\u4e0d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3652,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3651","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3651","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3651"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3651\/revisions"}],"predecessor-version":[{"id":3653,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3651\/revisions\/3653"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3652"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3651"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}