{"id":202672,"date":"2025-05-22T11:15:37","date_gmt":"2025-05-22T03:15:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202672\/"},"modified":"2025-05-22T11:15:37","modified_gmt":"2025-05-22T03:15:37","slug":"java%e4%b8%ad%e5%87%bd%e6%95%b0%e5%8f%82%e6%95%b0%e7%9a%84%e5%8f%8d%e5%b0%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202672\/","title":{"rendered":"Java\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u53cd\u5c04"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u53cd\u5c04<\/h1>\n<p>\u600e\u4e48\u5165\u95e8\u6587\u7ae0\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300aJava\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u53cd\u5c04\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729930393671ca4990eecc.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u4e2d\u51fd\u6570\u53c2\u6570\u7684\u53cd\u5c04<\/strong><\/p>\n<p><strong>\u7b80\u4ecb<\/strong><\/p>\n<p>\u53cd\u5c04\u4f7f\u60a8\u80fd\u591f\u5728\u8fd0\u884c\u65f6\u68c0\u67e5\u548c\u4fee\u6539 Java \u7c7b\u548c\u5bf9\u8c61\u7684\u4fe1\u606f\u3002\u8fd9\u5305\u62ec\u8bfb\u53d6\u548c\u8bbe\u7f6e\u51fd\u6570\u53c2\u6570\u7684\u503c\u3002<\/p>\n<p><strong>\u8bed\u6cd5<\/strong><\/p>\n<p>\u8981\u83b7\u53d6\u51fd\u6570\u53c2\u6570\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>java.lang.reflect.Parameter<\/code> \u7c7b\uff1a<\/p>\n<pre>Method method = ...;  \/\/ \u83b7\u53d6\u5305\u542b\u6240\u9700\u51fd\u6570\u7684 Method \u5bf9\u8c61\nParameter[] parameters = method.getParameters();<\/pre>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p><strong>\u8bfb\u53d6\u53c2\u6570\u7c7b\u578b\u548c\u540d\u79f0<\/strong><\/p>\n<pre>for (Parameter parameter : parameters) {\n    System.out.println(\"\u53c2\u6570\u7c7b\u578b\uff1a\" + parameter.getType());\n    System.out.println(\"\u53c2\u6570\u540d\u79f0\uff1a\" + parameter.getName());\n}<\/pre>\n<p><strong>\u4fee\u6539\u53c2\u6570\u503c<\/strong><\/p>\n<p>\u901a\u8fc7\u53cd\u5c04\uff0c\u60a8\u53ef\u4ee5\u5c06\u503c\u5206\u914d\u7ed9\u51fd\u6570\u53c2\u6570\u3002\u4f46\u662f\uff0c\u8fd9\u53ea\u80fd\u5728\u51fd\u6570\u6267\u884c\u4e4b\u524d\u8fdb\u884c\u3002<\/p>\n<pre>Method method = ...;\nObject[] args = ...;  \/\/ \u521d\u59cb\u5316 args \u6570\u7ec4\u4ee5\u4f20\u9012\u7ed9\u51fd\u6570\n\n\/\/ \u83b7\u53d6\u7b2c\u4e00\u4e2a\u53c2\u6570\nParameter parameter = method.getParameters()[0];\n\n\/\/ \u5c06\u503c\u5206\u914d\u7ed9\u53c2\u6570\nparameter.setAccessible(true);\nparameter.setValue(args, ...);<\/pre>\n<p><strong>\u6ce8\u610f<\/strong><\/p>\n<ul>\n<li>\u5728\u4fee\u6539\u53c2\u6570\u503c\u4e4b\u524d\uff0c\u5fc5\u987b\u8c03\u7528 <code>setAccessible(true)<\/code> \u4ee5\u7981\u7528 Java \u7684\u5b89\u5168\u68c0\u67e5\u3002<\/li>\n<li>Java 9 \u53ca\u66f4\u9ad8\u7248\u672c\u6dfb\u52a0\u4e86 <code>java.lang.reflect.Parameter.isNamePresent()<\/code> \u65b9\u6cd5\uff0c\u5b83\u53ef\u7528\u4e8e\u68c0\u67e5\u53c2\u6570\u540d\u79f0\u662f\u5426\u5b58\u5728\u3002<\/li>\n<li>\u5e76\u975e\u6240\u6709\u7f16\u8bd1\u5668\u90fd\u652f\u6301\u83b7\u53d6\u53c2\u6570\u540d\u79f0\u3002\u4f8b\u5982\uff0cEclipse \u5728 9.0 \u4e4b\u524d\u7684\u7248\u672c\u4e2d\u4e0d\u652f\u6301\u6b64\u529f\u80fd\u3002<\/li>\n<\/ul>\n<p>\u4eca\u5929\u5173\u4e8e\u300aJava\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u53cd\u5c04\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8ejava,\u53cd\u5c04\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u53cd\u5c04 \u600e\u4e48\u5165&#46;&#46;&#46;<\/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-202672","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202672","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=202672"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202672\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}