{"id":202969,"date":"2025-05-22T10:46:02","date_gmt":"2025-05-22T02:46:02","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202969\/"},"modified":"2025-05-22T10:46:02","modified_gmt":"2025-05-22T02:46:02","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%9c%a8%e6%95%b0%e6%8d%ae%e6%b5%81%e5%a4%84%e7%90%86%e4%b8%ad%e7%9a%84%e8%a7%a3%e8%80%a6%e4%b8%8e%e5%8f%af%e6%89%a9%e5%b1%95%e6%80%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202969\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u6d41\u5904\u7406\u4e2d\u7684\u89e3\u8026\u4e0e\u53ef\u6269\u5c55\u6027"},"content":{"rendered":"

<\/b> <\/p>\n

Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u6d41\u5904\u7406\u4e2d\u7684\u89e3\u8026\u4e0e\u53ef\u6269\u5c55\u6027<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u6d41\u5904\u7406\u4e2d\u7684\u89e3\u8026\u4e0e\u53ef\u6269\u5c55\u6027\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u6d41\u5904\u7406\u4e2d\u7684\u89e3\u8026\u4e0e\u53ef\u6269\u5c55\u6027<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u7eaf\u51fd\u6570\u3001\u4e0d\u53ef\u53d8\u6570\u636e\u548c\u4e00\u7b49\u51fd\u6570\u3002\u901a\u8fc7\u91c7\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u51fa\u66f4\u6613\u4e8e\u63a8\u7406\u3001\u6d4b\u8bd5\u548c\u7ef4\u62a4\u7684\u6570\u636e\u6d41\u5904\u7406\u4ee3\u7801\u3002<\/p>\n

\u89e3\u8026<\/strong><\/p>\n

\u6570\u636e\u6d41\u5904\u7406\u7ba1\u9053\u901a\u5e38\u7531\u591a\u4e2a\u7ec4\u4ef6\u7ec4\u6210\uff0c\u8fd9\u4e9b\u7ec4\u4ef6\u8d1f\u8d23\u6267\u884c\u4e0d\u540c\u7684\u4efb\u52a1\u3002\u51fd\u6570\u5f0f\u7f16\u7a0b\u901a\u8fc7\u4f7f\u7528\u7eaf\u51fd\u6570\u548c\u4e0d\u53ef\u53d8\u6570\u636e\u6765\u4fc3\u8fdb\u7ec4\u4ef6\u4e4b\u95f4\u7684\u89e3\u8026\u3002\u7eaf\u51fd\u6570\u4e0d\u4f1a\u4fee\u6539\u5b83\u4eec\u6240\u63a5\u6536\u7684\u6570\u636e\uff0c\u5e76\u4e14\u603b\u662f\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u7ed9\u5b9a\u76f8\u540c\u7684\u8f93\u5165\u3002\u8fd9\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u66ff\u6362\u7ec4\u4ef6\uff0c\u800c\u4e0d\u5fc5\u62c5\u5fc3\u4ea7\u751f\u610f\u60f3\u4e0d\u5230\u7684\u7ed3\u679c\u3002<\/p>\n

\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u51fd\u6570\u68c0\u67e5\u4e8b\u4ef6\u662f\u5426\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\uff1a<\/p>\n

Function<Event, Boolean> condition = event -> event.type == \"error\";<\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8be5\u51fd\u6570\u6765\u8fc7\u6ee4\u6d41\u4e2d\u7684\u4e8b\u4ef6\uff0c\u53ea\u7559\u4e0b\u7b26\u5408\u6761\u4ef6\u7684\u4e8b\u4ef6\uff1a<\/p>\n
Stream<Event> filteredEvents = events.filter(condition);<\/pre>\n
\u53ef\u6269\u5c55\u6027<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u4e00\u7b49\u51fd\u6570\u5141\u8bb8\u6211\u4eec\u5bf9\u51fd\u6570\u8fdb\u884c\u7ec4\u5408\u548c\u4f20\u9012\uff0c\u8fd9\u63d0\u4f9b\u4e86\u5de8\u5927\u7684\u53ef\u6269\u5c55\u6027\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Map\u3001Filter \u548c Reduce \u7b49\u64cd\u4f5c\u7b26\u6765\u6784\u5efa\u590d\u6742\u7684\u6570\u636e\u6d41\u7ba1\u9053\uff0c\u800c\u65e0\u9700\u663e\u5f0f\u5730\u5b9e\u73b0\u5b83\u4eec\u3002<\/p>\n
\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u64cd\u4f5c\u7b26\u4ece\u6d41\u4e2d\u63d0\u53d6\u9519\u8bef\u4e8b\u4ef6\uff0c\u5e76\u5c06\u5176\u6620\u5c04\u5230\u6307\u5b9a\u9519\u8bef\u683c\u5f0f\u7684\u65b0\u5bf9\u8c61\uff1a<\/p>\n
Stream<ErrorEvent> errorEvents = events\n        .filter(condition)\n        .map(ErrorEvent::fromEvent);<\/pre>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u65e5\u5fd7\u5206\u6790<\/strong><\/p>\n
\u8ba9\u6211\u4eec\u8003\u8651\u4e00\u4e2a\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u5206\u6790\u65e5\u5fd7\u6587\u4ef6\u7684\u5b9e\u9645\u4f8b\u5b50\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u5c06\u65e5\u5fd7\u884c\u6620\u5c04\u5230\u5305\u542b\u65f6\u95f4\u6233\u548c\u65e5\u5fd7\u6d88\u606f\u7684\u65b0\u5bf9\u8c61\uff1a<\/p>\n
Function<String, LogEntry> mapper = line -> new LogEntry(line.split(\" \")[0], line.split(\" \")[1]);<\/pre>\n
\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Filter \u64cd\u4f5c\u7b26\u8fc7\u6ee4\u51fa\u9519\u8bef\u65e5\u5fd7\uff1a<\/p>\n
Function<LogEntry, Boolean> errorFilter = entry -> entry.message.contains(\"error\");<\/pre>\n
\u6700\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Reduce \u64cd\u4f5c\u7b26\u6765\u8ba1\u7b97\u9519\u8bef\u65e5\u5fd7\u7684\u603b\u6570\uff1a<\/p>\n
int errorCount = logEntries\n        .filter(errorFilter)\n        .reduce(0, (count, entry) -> count + 1);<\/pre>\n
\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u6784\u5efa\u89e3\u8026\u4e14\u53ef\u6269\u5c55\u7684\u6570\u636e\u6d41\u5904\u7406\u7ba1\u9053\uff0c\u4ece\u800c\u7b80\u5316\u65e5\u5fd7\u5206\u6790\u7b49\u4efb\u52a1\u3002<\/p>\n
\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300aJava\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u6d41\u5904\u7406\u4e2d\u7684\u89e3\u8026\u4e0e\u53ef\u6269\u5c55\u6027\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728\u6570\u636e\u6d41\u5904\u7406\u4e2d...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202969","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202969"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202969\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}