{"id":202584,"date":"2025-05-22T08:33:25","date_gmt":"2025-05-22T00:33:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202584\/"},"modified":"2025-05-22T08:33:25","modified_gmt":"2025-05-22T00:33:25","slug":"java%e5%87%bd%e6%95%b0%e5%a6%82%e4%bd%95%e5%80%9f%e5%8a%a9%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5%e6%8f%90%e5%8d%87%e4%bb%a3%e7%a0%81%e5%8f%af%e5%a4%8d%e7%94%a8%e6%80%a7%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202584\/","title":{"rendered":"Java\u51fd\u6570\u5982\u4f55\u501f\u52a9\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347\u4ee3\u7801\u53ef\u590d\u7528\u6027\uff1f"},"content":{"rendered":"

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

Java\u51fd\u6570\u5982\u4f55\u501f\u52a9\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347\u4ee3\u7801\u53ef\u590d\u7528\u6027\uff1f<\/h1>\n

\u4eca\u5929\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u300aJava\u51fd\u6570\u5982\u4f55\u501f\u52a9\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347\u4ee3\u7801\u53ef\u590d\u7528\u6027\uff1f\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u662f\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u6216\u8005\u5df2\u7ecf\u662f\u5927\u4f6c\u7ea7\u522b\u4e86\uff0c\u90fd\u975e\u5e38\u6b22\u8fce\u4e5f\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u7ed9\u6211\u5efa\u8bae\u8bc4\u8bba\u54c8~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff01<\/p>\n

Java \u51fd\u6570\u4e2d\u7684\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347\u4e86\u4ee3\u7801\u53ef\u590d\u7528\u6027\uff0c\u901a\u8fc7\u5916\u90e8\u6ce8\u5165\u5bf9\u8c61\u4f9d\u8d56\u5173\u7cfb\u5b9e\u73b0\u4ee3\u7801\u89e3\u8026\uff1a\u5047\u8bbe\u6709\u4e00\u4e2a\u51fd\u6570\u901a\u8fc7\u786c\u7f16\u7801\u8ba1\u7b97\u7528\u6237\u5206\u6570\uff0c\u4f9d\u8d56\u4e8e\u7528\u6237 VIP \u72b6\u6001\u548c\u6700\u8fd1\u8d2d\u4e70\u8bb0\u5f55\uff1b\u5e94\u7528\u4f9d\u8d56\u6ce8\u5165\u540e\uff0c\u901a\u8fc7\u6784\u9020\u6ce8\u5165\u5c06\u5bf9\u7528\u6237\u5bf9\u8c61\u7684\u4f9d\u8d56\u5173\u7cfb\u5916\u90e8\u5316\uff1b\u5728 Lambda \u51fd\u6570\u4e2d\u4f7f\u7528\u4f9d\u8d56\u6ce8\u5165\uff0c\u901a\u8fc7\u81ea\u5b9a\u4e49\u6ce8\u5165\u4e0d\u540c\u5b9e\u73b0\u4fbf\u4e8e\u6d4b\u8bd5\u548c\u751f\u4ea7\uff1b\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347\u4e86\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u6d4b\u8bd5\u6027\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u4e2d\u7684\u4f9d\u8d56\u6ce8\u5165\uff1a\u63d0\u5347\u4ee3\u7801\u53ef\u590d\u7528\u6027<\/strong><\/p>\n

\u4f9d\u8d56\u6ce8\u5165\uff08DI\uff09\u662f\u4e00\u79cd\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u901a\u8fc7\u5c06\u5bf9\u8c61\u4f9d\u8d56\u5173\u7cfb\u7684\u6ce8\u5165\u8f6c\u79fb\u5230\u5916\u90e8\u914d\u7f6e\u6765\u5b9e\u73b0\u4ee3\u7801\u89e3\u8026\u3002\u5728 Java \u51fd\u6570\u4e2d\uff0c\u4f7f\u7528 DI \u53ef\u4ee5\u63d0\u5347\u4ee3\u7801\u53ef\u590d\u7528\u6027\uff0c\u4f7f\u4e4b\u66f4\u5bb9\u6613\u7ef4\u62a4\u548c\u6d4b\u8bd5\u3002<\/p>\n

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

\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u51fd\u6570 calculateScore()<\/code>\uff0c\u9700\u8981\u8ba1\u7b97\u7528\u6237\u7684\u5206\u6570\uff1a<\/p>\n

public int calculateScore(User user) {\n    int score = 0;\n    if (user.isVip()) {\n        score += 10;\n    }\n    if (user.hasRecentPurchase()) {\n        score += 5;\n    }\n    return score;\n}<\/pre>\n
\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5bf9 user<\/code> \u7684 VIP \u72b6\u6001\u548c\u6700\u8fd1\u8d2d\u4e70\u8bb0\u5f55\u8fdb\u884c\u4e86\u786c\u7f16\u7801\u3002\u5982\u679c\u4e1a\u52a1\u89c4\u5219\u53d1\u751f\u53d8\u5316\uff0c\u6211\u4eec\u9700\u8981\u4fee\u6539\u51fd\u6570\u4ee3\u7801\u3002<\/p>\n
\u5e94\u7528\u4f9d\u8d56\u6ce8\u5165<\/strong><\/p>\n
\u901a\u8fc7 DI\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5bf9 user<\/code> \u7684\u4f9d\u8d56\u5173\u7cfb\u5916\u90e8\u6ce8\u5165\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
public class ScoreCalculator {\n\n    private User user;\n\n    public ScoreCalculator(User user) {\n        this.user = user;\n    }\n\n    public int calculateScore() {\n        int score = 0;\n        if (user.isVip()) {\n            score += 10;\n        }\n        if (user.hasRecentPurchase()) {\n            score += 5;\n        }\n        return score;\n    }\n}<\/pre>\n
\u73b0\u5728\uff0cScoreCalculator<\/code> \u6784\u9020\u51fd\u6570\u4e2d\u63a5\u53d7\u4e00\u4e2a User<\/code> \u5bf9\u8c61\uff0c\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6ce8\u5165\u4e0d\u540c\u7684 User<\/code> \u5bf9\u8c61\u3002<\/p>\n
\u5728 Lambda \u51fd\u6570\u4e2d\u4f7f\u7528 DI\uff1a<\/p>\n
import com.google.cloud.functions.HttpFunction;\nimport com.google.cloud.functions.HttpRequest;\nimport com.google.cloud.functions.HttpResponse;\nimport java.io.IOException;\nimport java.io.PrintWriter;\n\npublic class ScoreCalculatorLambda implements HttpFunction {\n\n    private final ScoreCalculator scoreCalculator;\n\n    public ScoreCalculatorLambda() {\n        this(new ScoreCalculator()); \/\/ \u8fd9\u91cc\u53ef\u4ee5\u6ce8\u5165\u81ea\u5b9a\u4e49\u5b9e\u73b0\n    }\n\n    ScoreCalculatorLambda(ScoreCalculator scoreCalculator) {\n        this.scoreCalculator = scoreCalculator;\n    }\n\n    @Override\n    public void service(HttpRequest request, HttpResponse response)\n            throws IOException {\n        \/\/ \u4ece\u8bf7\u6c42\u4e2d\u8bfb\u53d6\u7528\u6237\u6570\u636e\u5e76\u521b\u5efa User \u5bf9\u8c61\n        \/\/ ...\n\n        \/\/ \u8c03\u7528 scoreCalculator \u8ba1\u7b97\u5206\u6570\n        int score = scoreCalculator.calculateScore(user);\n\n        \/\/ \u5c06\u5206\u6570\u5199\u5165\u54cd\u5e94\n        var writer = new PrintWriter(response.getWriter());\n        writer.printf(\"Score: %d\", score);\n    }\n}<\/pre>\n
\u901a\u8fc7 DI\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u4e3a\u6d4b\u8bd5\u6216\u751f\u4ea7\u76ee\u7684\u6ce8\u5165\u4e0d\u540c\u7684 User<\/code> \u5b9e\u73b0\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u53ef\u590d\u7528\u6027\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aJava\u51fd\u6570\u5982\u4f55\u501f\u52a9\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347\u4ee3\u7801\u53ef\u590d\u7528\u6027\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u51fd\u6570\u5982\u4f55\u501f\u52a9\u4f9d\u8d56\u6ce8\u5165\u63d0\u5347...<\/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-202584","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202584","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=202584"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202584\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}