{"id":203092,"date":"2025-05-22T10:22:08","date_gmt":"2025-05-22T02:22:08","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203092\/"},"modified":"2025-05-22T10:22:08","modified_gmt":"2025-05-22T02:22:08","slug":"java-%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84%e5%bc%82%e5%b8%b8%e5%a4%84%e7%90%86%e4%b8%8e%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e6%9c%89%e4%bb%80%e4%b9%88%e5%85%b3%e8%81%94","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203092\/","title":{"rendered":"Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\u4e0e\u5e76\u53d1\u7f16\u7a0b\u6709\u4ec0\u4e48\u5173\u8054\uff1f"},"content":{"rendered":"

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

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\u4e0e\u5e76\u53d1\u7f16\u7a0b\u6709\u4ec0\u4e48\u5173\u8054\uff1f<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\u4e0e\u5e76\u53d1\u7f16\u7a0b\u6709\u4ec0\u4e48\u5173\u8054\uff1f\u300b\uff0c\u8986\u76d6\u4e86\u6587\u7ae0\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u5e76\u53d1\u7f16\u7a0b\u7d27\u5bc6\u76f8\u8fde\u3002\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u901a\u8fc7 Either \u7c7b\u578b\u5904\u7406\u5f02\u5e38\uff0c\u800c\u5e76\u53d1\u7f16\u7a0b\u4f7f\u7528 CompletableFuture \u8868\u793a\u5f02\u6b65\u64cd\u4f5c\u7684\u7ed3\u679c\u3002\u4e24\u8005\u7c7b\u4f3c\u4e4b\u5904\u5728\u4e8e\u90fd\u4f7f\u7528\u5bb9\u5668\u5c01\u88c5\u7ed3\u679c\u6216\u9519\u8bef\u4fe1\u606f\uff0c\u4ee5\u5b89\u5168\u94fe\u63a5\u64cd\u4f5c\u5e76\u7edf\u4e00\u5904\u7406\u9519\u8bef\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\u4e0e\u5e76\u53d1\u7f16\u7a0b\u7684\u5173\u8054<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u5e76\u53d1\u7f16\u7a0b\u662f\u4e24\u4e2a\u5bc6\u5207\u76f8\u5173\u7684\u6982\u5ff5\u3002\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u5bf9\u5f02\u5e38\u5904\u7406\u7684\u65b9\u6cd5\u4e0e\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u67d0\u4e9b\u6a21\u5f0f\u6709\u76f8\u4f3c\u4e4b\u5904\u3002<\/p>\n

\u5f02\u5e38\u5904\u7406<\/strong><\/p>\n

\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u503e\u5411\u4e8e\u4f7f\u7528 Either \u7c7b\u578b\u6765\u5904\u7406\u9519\u8bef\u3002Either \u7c7b\u578b\u662f\u4e00\u79cd\u6cdb\u578b\uff0c\u5b83\u5c01\u88c5\u4e86\u4e00\u4e2a\u503c\u6216\u8005\u4e00\u4e2a\u9519\u8bef\u3002\u5f53\u51fd\u6570\u6210\u529f\u8fd0\u884c\u65f6\uff0c\u5b83\u8fd4\u56de\u5305\u542b\u503c\u7684\u7ed3\u679c\u7c7b\u578b\uff1b\u5982\u679c\u53d1\u751f\u9519\u8bef\uff0c\u5b83\u8fd4\u56de\u5305\u542b\u9519\u8bef\u4fe1\u606f\u7684\u9519\u8bef\u7c7b\u578b\u3002<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8bed\u6cd5\u4e2d\u7684 map<\/code>\u3001flatMap<\/code> \u548c fold<\/code> \u7b49\u64cd\u4f5c\u7b26\u6765\u5904\u7406 Either \u503c\u3002\u8fd9\u5141\u8bb8\u6211\u4eec\u5728\u65e0\u9700\u663e\u5f0f\u68c0\u67e5\u9519\u8bef\u7684\u60c5\u51b5\u4e0b\u5b89\u5168\u5730\u94fe\u63a5\u4e00\u7cfb\u5217\u64cd\u4f5c\u3002<\/p>\n

\u5e76\u53d1\u7f16\u7a0b<\/strong><\/p>\n

\u5e76\u53d1\u7f16\u7a0b\u6d89\u53ca\u5904\u7406\u5e76\u53d1\u4efb\u52a1\u3002Java \u4e2d\u4e00\u4e2a\u5e38\u89c1\u7684\u5e76\u53d1\u7f16\u7a0b\u6a21\u5f0f\u662f\u4f7f\u7528 CompletableFuture<\/code>\u3002CompletableFuture<\/code> \u8868\u793a\u5bf9\u5f02\u6b65\u64cd\u4f5c\u7684\u672a\u6765\u7ed3\u679c\u3002<\/p>\n

CompletableFuture<\/code> \u63d0\u4f9b\u4e86\u7c7b\u4f3c\u4e8e Either \u7684 thenApply<\/code>\u3001thenCompose<\/code> \u548c handle<\/code> \u7b49\u64cd\u4f5c\uff0c\u53ef\u7528\u4e8e\u5904\u7406\u5e76\u53d1\u64cd\u4f5c\u7684\u7ed3\u679c\u6216\u9519\u8bef\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e9b\u64cd\u4f5c\u7b26\uff0c\u6211\u4eec\u53ef\u4ee5\u5f62\u6210\u79f0\u4e3a\u7ba1\u9053\uff08pipeline\uff09\u7684\u64cd\u4f5c\u94fe\uff0c\u4ee5\u8868\u793a\u590d\u6742\u7684\u5e76\u53d1\u4efb\u52a1\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n

\u8003\u8651\u4e00\u4e2a\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u5e76\u53d1\u7f16\u7a0b\u7684\u7b80\u5355\u793a\u4f8b\uff1a<\/p>\n

import java.util.concurrent.CompletableFuture;\n\nclass Main {\n\n  public static void main(String[] args) {\n    \/\/ \u51fd\u6570\u5f0f Either \u7c7b\u578b\n    Either<Throwable, Integer> result = \n      Either.right(10)  \/\/ \u6210\u529f\u7ed3\u679c\n        .flatMap(x -> Either.right(x * 2))  \/\/ \u5e94\u7528\u51fd\u6570\n        .flatMap(x -> Either.left(new RuntimeException()));  \/\/ \u4ea7\u751f\u9519\u8bef\n\n    \/\/ \u5e76\u53d1 CompletableFuture\n    CompletableFuture<Integer> future = \n      CompletableFuture.completedFuture(10)  \/\/ \u6210\u529f\u7684\u672a\u6765\u7ed3\u679c\n        .thenApply(x -> x * 2)  \/\/ \u5e94\u7528\u51fd\u6570\n        .thenCompose(x -> CompletableFuture.completedFuture(x))  \/\/ \u4ea7\u751f\u9519\u8bef\n        .handle((x, t) -> {  \/\/ \u5904\u7406\u7ed3\u679c\u6216\u9519\u8bef\n          if (t != null) {\n            return -1;  \/\/ \u53d1\u751f\u9519\u8bef\u65f6\u8fd4\u56de\u9ed8\u8ba4\u503c\n          } else {\n            return x;\n          }\n        });\n  }\n}<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u51fd\u6570\u5f0f Either \u94fe\u548c\u5e76\u53d1 CompletableFuture \u7ba1\u9053\u90fd\u6267\u884c\u4e86\u4e00\u7cfb\u5217\u64cd\u4f5c\uff0c\u7136\u540e\u5904\u7406\u7ed3\u679c\u6216\u9519\u8bef\u3002<\/p>\n
\u5173\u8054<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u5e76\u53d1\u7f16\u7a0b\u4e2d\u5f02\u5e38\u5904\u7406\u7684\u76f8\u4f3c\u4e4b\u5904\u5728\u4e8e\uff0c\u5728\u4e24\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u90fd\u4f7f\u7528\u67d0\u79cd\u5f62\u5f0f\u7684\u5bb9\u5668\u5c01\u88c5\u7ed3\u679c\u6216\u9519\u8bef\u4fe1\u606f\u3002\u8fd9\u5141\u8bb8\u6211\u4eec\u5b89\u5168\u5730\u94fe\u63a5\u64cd\u4f5c\u5e76\u7edf\u4e00\u5904\u7406\u9519\u8bef\uff0c\u540c\u65f6\u4fdd\u6301\u4ee3\u7801\u7684\u7b80\u6d01\u548c\u6613\u8bfb\u6027\u3002<\/p>\n
\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\u4e0e\u5e76\u53d1\u7f16\u7a0b\u6709\u4ec0\u4e48\u5173\u8054\uff1f\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\u5e76\u53d1\u7f16\u7a0b,\u5f02\u5e38\u5904\u7406\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406...<\/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-203092","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203092","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=203092"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203092\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}