{"id":206347,"date":"2025-06-12T10:58:38","date_gmt":"2025-06-12T02:58:38","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206347\/"},"modified":"2025-06-12T10:58:38","modified_gmt":"2025-06-12T02:58:38","slug":"go-%e4%b8%ad-var-_-handler-handlernil-%e8%bf%99%e7%a7%8d%e5%8f%98%e9%87%8f%e5%ae%9a%e4%b9%89%e5%86%99%e6%b3%95%e6%9c%89%e4%bb%80%e4%b9%88%e4%bd%9c%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206347\/","title":{"rendered":"Go \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f"},"content":{"rendered":"

\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60
\nGOLANG<\/span>\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587
\n\u300aGo \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0
\nGOLANG<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01,
\n,
\n\u5173\u4e8e go \u4e2d\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u7684\u7591\u95ee<\/strong>,\u6587\u4e2d\u63d0\u5230\u7684\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5 var _ handler = (*handler)(nil) \u8ba9\u4eba\u56f0\u60d1\uff0c\u8ba9\u6211\u4eec\u6df1\u5165\u4e86\u89e3\u4e00\u4e0b\u5176\u542b\u4e49\u3002,
\n\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00<\/strong>,go \u8bed\u8a00\u63d0\u4f9b\u4e86\u4e00\u79cd\u79f0\u4e3a\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00\u7684\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u5c06\u4e00\u4e2a\u53d8\u91cf\u58f0\u660e\u4e3a\u7279\u5b9a\u7c7b\u578b\u7684\u63a5\u53e3\u3002var _ handler = (*handler)(nil) \u6267\u884c\u7684\u5c31\u662f\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00\u3002,\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u4e00\u4e2a\u540d\u4e3a _ \u7684\u53d8\u91cf\u88ab\u58f0\u660e\u4e3a handler \u63a5\u53e3\u7c7b\u578b\u3002(nil) \u88ab\u7528\u4f5c\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u56e0\u4e3a\u63a5\u53e3\u5728 go \u4e2d\u662f\u901a\u8fc7\u7279\u5b9a\u7c7b\u578b\u5b9e\u73b0\u7684\u3002,
\n\u4f5c\u7528<\/strong>,\u8fd9\u79cd\u5199\u6cd5\u901a\u5e38\u7528\u4e8e\u4ee5\u4e0b\u76ee\u7684\uff1a,
\n\u5177\u4f53\u542b\u4e49<\/strong>,var _ handler = (*handler)(nil) \u542b\u4e49\u5982\u4e0b\uff1a,
\n\u793a\u4f8b<\/strong>,\u4e0b\u9762\u7684\u793a\u4f8b\u8bf4\u660e\u4e86\u5982\u4f55\u4f7f\u7528\u6b64\u5199\u6cd5\uff1a,\u901a\u8fc7\u4f7f\u7528\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u53d8\u91cf\u5b9e\u73b0\u4e86\u7279\u5b9a\u7684\u63a5\u53e3\u5e76\u8bbf\u95ee\u5176\u529f\u80fd\u3002,\u4eca\u5929\u5173\u4e8e\u300aGo \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\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\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff01,(*handler)(nil) \u662f\u63a5\u53e3\u7684\u4e00\u79cd\u5b9e\u73b0\uff0c\u5176\u4e2d handler \u662f\u7ed3\u6784\u4f53\u7c7b\u578b\uff0c(nil) \u8868\u793a\u5b9e\u73b0\u672a\u8d4b\u503c\uff0c\u4f46\u4ecd\u7136\u6ee1\u8db3\u63a5\u53e3\u8981\u6c42\u3002,handler \u662f\u8981\u5b9e\u73b0\u7684\u63a5\u53e3\u7c7b\u578b\u3002,_ \u662f\u533f\u540d\u53d8\u91cf\uff0c\u53ea\u8d77\u5230\u7c7b\u578b\u68c0\u67e5\u7684\u76ee\u7684\uff0c\u800c\u4e0d\u4f1a\u88ab\u5b9e\u9645\u4f7f\u7528\u3002,\u7528\u4e00\u4e2a\u533f\u540d\u5b57\u6bb5\u5d4c\u5165\u7ed3\u6784\u4f53\u7684\u529f\u80fd\uff0c\u540c\u65f6\u5141\u8bb8\u7c7b\u578b\u65ad\u8a00\u3002,\u786e\u4fdd\u4e00\u4e2a\u53d8\u91cf\u5b9e\u73b0\u4e86\u7279\u5b9a\u7684\u63a5\u53e3\u3002,\u5173\u4e8e go \u4e2d\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u7684\u7591\u95ee,\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60
\nGOLANG<\/span>\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587
\n\u300aGo \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0
\nGOLANG<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Go \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/span><\/p>\n

Go \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h1>\n

2024-11-10 11:37:05<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60GOLANG<\/span>\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u300aGo \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0GOLANG<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/p>\n

<\/p>\n

\u5173\u4e8e go \u4e2d\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u7684\u7591\u95ee<\/strong><\/p>\n

\u6587\u4e2d\u63d0\u5230\u7684\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5 var _ handler = (*handler)(nil) \u8ba9\u4eba\u56f0\u60d1\uff0c\u8ba9\u6211\u4eec\u6df1\u5165\u4e86\u89e3\u4e00\u4e0b\u5176\u542b\u4e49\u3002<\/p>\n

\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00<\/strong><\/p>\n

go \u8bed\u8a00\u63d0\u4f9b\u4e86\u4e00\u79cd\u79f0\u4e3a\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00\u7684\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u5c06\u4e00\u4e2a\u53d8\u91cf\u58f0\u660e\u4e3a\u7279\u5b9a\u7c7b\u578b\u7684\u63a5\u53e3\u3002var _ handler = (*handler)(nil) \u6267\u884c\u7684\u5c31\u662f\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u4e00\u4e2a\u540d\u4e3a _ \u7684\u53d8\u91cf\u88ab\u58f0\u660e\u4e3a handler \u63a5\u53e3\u7c7b\u578b\u3002(nil) \u88ab\u7528\u4f5c\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u56e0\u4e3a\u63a5\u53e3\u5728 go \u4e2d\u662f\u901a\u8fc7\u7279\u5b9a\u7c7b\u578b\u5b9e\u73b0\u7684\u3002<\/p>\n

\u4f5c\u7528<\/strong><\/p>\n

\u8fd9\u79cd\u5199\u6cd5\u901a\u5e38\u7528\u4e8e\u4ee5\u4e0b\u76ee\u7684\uff1a<\/p>\n

    \n
  • \u786e\u4fdd\u4e00\u4e2a\u53d8\u91cf\u5b9e\u73b0\u4e86\u7279\u5b9a\u7684\u63a5\u53e3\u3002<\/li>\n
  • \u7528\u4e00\u4e2a\u533f\u540d\u5b57\u6bb5\u5d4c\u5165\u7ed3\u6784\u4f53\u7684\u529f\u80fd\uff0c\u540c\u65f6\u5141\u8bb8\u7c7b\u578b\u65ad\u8a00\u3002<\/li>\n<\/ul>\n

    \u5177\u4f53\u542b\u4e49<\/strong><\/p>\n

    var _ handler = (*handler)(nil) \u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n

      \n
    • _ \u662f\u533f\u540d\u53d8\u91cf\uff0c\u53ea\u8d77\u5230\u7c7b\u578b\u68c0\u67e5\u7684\u76ee\u7684\uff0c\u800c\u4e0d\u4f1a\u88ab\u5b9e\u9645\u4f7f\u7528\u3002<\/li>\n
    • handler \u662f\u8981\u5b9e\u73b0\u7684\u63a5\u53e3\u7c7b\u578b\u3002<\/li>\n
    • (*handler)(nil) \u662f\u63a5\u53e3\u7684\u4e00\u79cd\u5b9e\u73b0\uff0c\u5176\u4e2d handler \u662f\u7ed3\u6784\u4f53\u7c7b\u578b\uff0c(nil) \u8868\u793a\u5b9e\u73b0\u672a\u8d4b\u503c\uff0c\u4f46\u4ecd\u7136\u6ee1\u8db3\u63a5\u53e3\u8981\u6c42\u3002<\/li>\n<\/ul>\n

      \u793a\u4f8b<\/strong><\/p>\n

      \u4e0b\u9762\u7684\u793a\u4f8b\u8bf4\u660e\u4e86\u5982\u4f55\u4f7f\u7528\u6b64\u5199\u6cd5\uff1a<\/p>\n

      type Animal interface {\n    Speak()\n}\n\ntype Dog struct{}\n\nfunc (d *Dog) Speak() {\n    fmt.Println(\"Woof woof!\")\n}\n\nfunc main() {\n    var _ Animal = (*Dog)(nil) \/\/ \u786e\u4fdd Dog \u7ed3\u6784\u4f53\u5b9e\u73b0\u4e86 Animal \u63a5\u53e3\n}<\/pre>\n
      \u901a\u8fc7\u4f7f\u7528\u53d8\u91cf\u7c7b\u578b\u65ad\u8a00\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u53d8\u91cf\u5b9e\u73b0\u4e86\u7279\u5b9a\u7684\u63a5\u53e3\u5e76\u8bbf\u95ee\u5176\u529f\u80fd\u3002<\/p>\n
      \u4eca\u5929\u5173\u4e8e\u300aGo \u4e2d `var _ Handler = (*handler)(nil)` \u8fd9\u79cd\u53d8\u91cf\u5b9a\u4e49\u5199\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f\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\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8GOLANG\u516c\u4f17\u53f7\uff01<\/p>\n
      \n
      \n <\/dt>\n
      \n   Gin\u6846\u67b6\u8def\u7531\u72b6\u6001\u7801\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u6ce8\u91ca\u6389\u7ed1\u5b9aJSON\u6570\u636e\u540e\u63a5\u53e3\u8fd4\u56de\u72b6\u6001\u7801\u53d8\u4e3a400\uff1f\n <\/dd>\n<\/dl>\n
      \n
      \n <\/dt>\n
      \n   Spring IOC \u4e2d\u6ce8\u5165\u76f8\u540c\u540d\u79f0\u7684 Bean \u4f1a\u5bfc\u81f4\u4ec0\u4e48\u9519\u8bef\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
      \u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5...<\/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-206347","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206347","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=206347"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206347\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}