{"id":10008373,"date":"2024-02-20T19:47:36","date_gmt":"2024-02-20T11:47:36","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008373"},"modified":"2024-02-20T19:47:36","modified_gmt":"2024-02-20T11:47:36","slug":"java-21-%e8%99%9a%e6%8b%9f%e7%ba%bf%e7%a8%8b%e5%a6%82%e4%bd%95%e9%99%90%e6%b5%81%e6%8e%a7%e5%88%b6%e5%90%9e%e5%90%90%e9%87%8f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008373","title":{"rendered":"Java 21 \u865a\u62df\u7ebf\u7a0b\u5982\u4f55\u9650\u6d41\u63a7\u5236\u541e\u5410\u91cf"},"content":{"rendered":"<p>\u865a\u62df\u7ebf\u7a0b\uff08Virtual Threads\uff09\u662f Java 21 \u6240\u6709\u65b0\u7279\u6027\u4e2d\u6700\u4e3a\u5438\u5f15\u4eba\u7684\u5185\u5bb9\uff0c\u5b83\u53ef\u4ee5\u5927\u5927\u6765\u7b80\u5316\u548c\u589e\u5f3aJava\u5e94\u7528\u7684\u5e76\u53d1\u6027\u3002\u4f46\u662f\uff0c\u968f\u7740\u8fd9\u4e9b\u53d8\u5316\u800c\u6765\u7684\u662f\u5982\u4f55\u6700\u597d\u5730\u7ba1\u7406\u6b64\u541e\u5410\u91cf\u7684\u95ee\u9898\u3002\u672c\u6587\uff0c\u5c31\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u5f00\u53d1\u4eba\u5458\u5728\u4f7f\u7528\u865a\u62df\u7ebf\u7a0b\u65f6\uff0c\u5e94\u8be5\u5982\u4f55\u7ba1\u7406\u541e\u5410\u91cf\u3002<\/p>\n<p>\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5f00\u53d1\u4eba\u5458\u4e0d\u9700\u8981\u81ea\u5df1\u521b\u5efa\u865a\u62df\u7ebf\u7a0b\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e Web \u5e94\u7528\u7a0b\u5e8f\uff0cTomcat \u6216 Jetty \u7b49\u5e95\u5c42\u6846\u67b6\u5c06\u4e3a\u6bcf\u4e2a\u4f20\u5165\u8bf7\u6c42\u81ea\u52a8\u751f\u6210\u4e00\u4e2a\u865a\u62df\u7ebf\u7a0b\u3002<\/p>\n<p>\u5982\u679c\u5728\u5e94\u7528\u7a0b\u5e8f\u5185\u90e8\u9700\u8981\u81ea\u884c\u8c03\u7528\u6765\u63d0\u4f9b\u4e1a\u52a1\u5e76\u53d1\u80fd\u529b\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=o9Eo2telp7LwbGkhXh7SUg%3D%3D.WYH1cCib1qU7x5Vw8oDtWjuLRRC4r9OEFzhSFDJd8yoAGankItOlweV0ntPVzcXbgXYH0OXYERO2IJAIV28H09pIIM4N6PcJnf28crDmucE%3D\" rel=\"noopener noreferrer\">Java 21\u65b0\u7279\u6027\uff1a\u865a\u62df\u7ebf\u7a0b\uff08Virtual Threads\uff09<\/a>\u4e2d\u4ecb\u7ecd\u7684\u65b9\u6cd5\u53bb\u521b\u5efa\u548c\u4f7f\u7528\uff0c\u6bd4\u5982\u8f83\u4e3a\u5e38\u7528\u7684\u5c31\u662f<code>Executors.newVirtualThreadPerTaskExecutor()<\/code>\u3002<\/p>\n<pre><code class=\"java\">Runnable runnable = () -&gt; {\n    System.out.println(&quot;Hello, www.didispace.com&quot;);\n};\n\ntry (ExecutorService executorService = Executors.newVirtualThreadPerTaskExecutor()) {\n    for (int i = 0; i &lt; 100; i++) {\n        executorService.submit(runnable);\n    }\n}<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u50cf\u4e0a\u9762\u5f00\u542f100\u4e2a\u865a\u62df\u7ebf\u7a0b\u6765\u6267\u884c\u4efb\u52a1\u3002\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u6211\u4eec\u8981\u5982\u4f55\u5bf9\u865a\u62df\u7ebf\u7a0b\u9650\u6d41\u63a7\u5236\u541e\u5410\u91cf\u5462\uff1f<\/p>\n<h2>\u865a\u62df\u7ebf\u7a0b\u7684\u9650\u6d41<\/h2>\n<p>\u5bf9\u4e8e\u865a\u62df\u7ebf\u7a0b\u5e76\u53d1\u63a7\u5236\u7684\u7b54\u6848\u662f\uff1a\u4fe1\u53f7\u91cf\uff01<strong>\u5212\u91cd\u70b9\uff1a\u4e0d\u8981\u6c60\u5316\u865a\u62df\u7ebf\u7a0b\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e0d\u662f\u7a00\u7f3a\u8d44\u6e90\u3002<\/strong>\u6240\u4ee5\uff0c\u5bf9\u4e8e\u865a\u62df\u7ebf\u7a0b\u5e76\u53d1\u63a7\u5236\u7684\u6700\u4f73\u65b9\u6848\u662f\u4f7f\u7528<code>java.util.concurrent.Semaphore<\/code>\u3002<\/p>\n<p>\u4e0b\u9762\u7684\u4ee3\u7801\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u5b9e\u73b0<code>java.util.concurrent.Semaphore<\/code>\u6765\u63a7\u5236\u865a\u62df\u7ebf\u7a0b\u7684\u5e76\u53d1\u6570\u91cf\uff1a<\/p>\n<pre><code class=\"java\">public class SemaphoreExample {\n\n    \/\/ \u5b9a\u4e49\u9650\u6d41\u5e76\u53d1\u7684\u4fe1\u53f7\u91cf\uff0c\u8fd9\u91cc\u8bbe\u7f6e\u4e3a\uff1a10\n    private static final Semaphore POOL = new Semaphore(10); \n\n    public void callOldService(...) {\n        try{\n            POOL.acquire(); \/\/ \u5c1d\u8bd5\u901a\u8fc7\u4fe1\u53f7\u91cf\u83b7\u53d6\u6267\u884c\u8bb8\u53ef\n        } catch(InterruptedException e){\n            \/\/ \u6267\u884c\u8bb8\u53ef\u83b7\u53d6\u5931\u8d25\u7684\u5f02\u5e38\u5904\u7406        \n        }\n    \n        try {\n            \/\/ \u83b7\u53d6\u5230\u6267\u884c\u8bb8\u53ef\uff0c\u8fd9\u91cc\u662f\u4f7f\u7528\u865a\u62df\u7ebf\u7a0b\u6267\u884c\u4efb\u52a1\u7684\u903b\u8f91\n        } finally {\n            \/\/ \u91ca\u653e\u4fe1\u53f7\u91cf\n            POOL.release(); \n        }\n    }\n}<\/code><\/pre>\n<p>\u662f\u4e0d\u662f\u5f88\u7b80\u5355\u5462\uff1f\u4eca\u5929\u7684\u5206\u4eab\u5c31\u5230\u8fd9\u91cc\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff0c\u66f4\u591a\u5173\u4e8eJava\u65b0\u7279\u6027\u7684\u5b66\u4e60\u53ef\u4ee5\u5173\u6ce8\u6211\u7684\u514d\u8d39\u4e13\u680f<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=RwC1aH2exid8zRi6kFYqdg%3D%3D.15uTDzxPWhx2qocT4ZnOStzls%2BGCysYNM9NZHA0%2FNV63q08nT1cYzIQO8xxvIjzR\" rel=\"noopener noreferrer\">Java\u65b0\u7279\u6027<\/a>\u3002<\/p>\n<h2>\u6269\u5c55\u9605\u8bfb<\/h2>\n<ul>\n<li><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=FTbmoYEJQNEK3nUWdlNLEw%3D%3D.1mdGN5xYPzNxuztkOynD5LPsMCrq2jjUbHF8hJI1o8cwIx%2BzYSMOG93qG0mlWiXESO0FRKeRQnUvOg6%2B2YhUrA%3D%3D\" rel=\"noopener noreferrer\">\u542f\u52a81000\u4e07\u4e2a\u865a\u62df\u7ebf\u7a0b\u9700\u8981\u591a\u5c11\u65f6\u95f4\uff1f\u9700\u8981\u591a\u5c11\u5e73\u53f0\u7ebf\u7a0b\uff1f<\/a><\/li>\n<li><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=UHU6YB0cSbPk8EqHJYTNoQ%3D%3D.X%2F4ax5GSm0%2B%2BpwnIMO9%2FlTe6XpzyX2H5lVQM%2BP27IM%2BKKUzGt2pt2rJxoeVDsfo6km7Q%2FfqD34xQUcvepM0ncjAlyUDIAxfdsOOWNk5bxfwYtXlVc3fuRArWJFsInIXj\" rel=\"noopener noreferrer\">Spring Boot\u865a\u62df\u7ebf\u7a0b\u4e0eWebflux\u5728JWT\u9a8c\u8bc1\u548cMySQL\u67e5\u8be2\u4e0a\u7684\u6027\u80fd\u6bd4\u8f83<\/a><\/li>\n<\/ul>\n<blockquote><p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u516c\u4f17\u53f7\uff1a\u7a0b\u5e8f\u733fDD\u3002\u7b2c\u4e00\u65f6\u95f4\u4e86\u89e3\u524d\u6cbf\u884c\u4e1a\u6d88\u606f\u3001\u5206\u4eab\u6df1\u5ea6\u6280\u672f\u5e72\u8d27\u3001\u83b7\u53d6\u4f18\u8d28\u5b66\u4e60\u8d44\u6e90<\/p><\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044643044\">https:\/\/segmentfault.com\/a\/1190000044643044<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u865a\u62df\u7ebf\u7a0b\uff08Virtual Threads\uff09\u662f Java 21 \u6240\u6709\u65b0\u7279\u6027\u4e2d\u6700\u4e3a\u5438\u5f15\u4eba\u7684\u5185\u5bb9\uff0c\u5b83\u53ef\u4ee5\u5927\u5927\u6765\u7b80\u5316\u548c [&hellip;]<\/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-10008373","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\/10008373","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=10008373"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008373\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}