{"id":535,"date":"2023-05-28T02:11:03","date_gmt":"2023-05-27T18:11:03","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=535"},"modified":"2023-05-28T02:11:03","modified_gmt":"2023-05-27T18:11:03","slug":"controller%e5%b1%82%e4%bb%a3%e7%a0%81%e5%b0%b1%e8%af%a5%e8%bf%99%e4%b9%88%e5%86%99%ef%bc%8c%e7%ae%80%e6%b4%81%e5%8f%88%e4%bc%98%e9%9b%85%ef%bc%81","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/java\/controller%e5%b1%82%e4%bb%a3%e7%a0%81%e5%b0%b1%e8%af%a5%e8%bf%99%e4%b9%88%e5%86%99%ef%bc%8c%e7%ae%80%e6%b4%81%e5%8f%88%e4%bc%98%e9%9b%85%ef%bc%81\/","title":{"rendered":"Controller\u5c42\u4ee3\u7801\u5c31\u8be5\u8fd9\u4e48\u5199\uff0c\u7b80\u6d01\u53c8\u4f18\u96c5\uff01"},"content":{"rendered":"
\n
\n
\u4f5c\u8005\uff1agelald<\/span><\/section>\n
\u6765\u6e90\uff1ajuejin.cn\/post\/7123091045071454238<\/span><\/section>\n<\/blockquote>\n

\u8bf4\u5230 Controller\uff0c\u76f8\u4fe1\u5927\u5bb6\u90fd\u4e0d\u964c\u751f\uff0c\u5b83\u53ef\u4ee5\u5f88\u65b9\u4fbf\u5730\u5bf9\u5916\u63d0\u4f9b\u6570\u636e\u63a5\u53e3\u3002\u5b83\u7684\u5b9a\u4f4d\uff0c\u6211\u8ba4\u4e3a\u662f\u300c\u4e0d\u53ef\u6216\u7f3a\u7684\u914d\u89d2\u300d\uff0c\u8bf4\u5b83\u4e0d\u53ef\u6216\u7f3a\u662f\u56e0\u4e3a\u65e0\u8bba\u662f\u4f20\u7edf\u7684\u4e09\u5c42\u67b6\u6784\u8fd8\u662f\u73b0\u5728\u7684COLA\u67b6\u6784\uff0cController \u5c42\u4f9d\u65e7\u6709\u4e00\u5e2d\u4e4b\u5730\uff0c\u8bf4\u660e\u4ed6\u7684\u5fc5\u8981\u6027\uff1b\u8bf4\u5b83\u662f\u914d\u89d2\u662f\u56e0\u4e3a Controller \u5c42\u7684\u4ee3\u7801\u4e00\u822c\u662f\u4e0d\u8d1f\u8d23\u5177\u4f53\u7684\u903b\u8f91\u4e1a\u52a1\u903b\u8f91\u5b9e\u73b0\uff0c\u4f46\u662f\u5b83\u8d1f\u8d23\u63a5\u6536\u548c\u54cd\u5e94\u8bf7\u6c42<\/p>\n

\u4ece\u73b0\u72b6\u770b\u95ee\u9898<\/span><\/h2>\n

Controller \u4e3b\u8981\u7684\u5de5\u4f5c\u6709\u4ee5\u4e0b\u51e0\u9879<\/p>\n

    \n
  • \n
    \u63a5\u6536\u8bf7\u6c42\u5e76\u89e3\u6790\u53c2\u6570<\/section>\n<\/li>\n
  • \n
    \u8c03\u7528 Service \u6267\u884c\u5177\u4f53\u7684\u4e1a\u52a1\u4ee3\u7801\uff08\u53ef\u80fd\u5305\u542b\u53c2\u6570\u6821\u9a8c\uff09<\/section>\n<\/li>\n
  • \n
    \u6355\u83b7\u4e1a\u52a1\u903b\u8f91\u5f02\u5e38\u505a\u51fa\u53cd\u9988<\/section>\n<\/li>\n
  • \n
    \u4e1a\u52a1\u903b\u8f91\u6267\u884c\u6210\u529f\u505a\u51fa\u54cd\u5e94<\/section>\n<\/li>\n<\/ul>\n
    \/\/DTO<\/span>
    @Data<\/span>
    public<\/span> class<\/span> TestDTO<\/span> <\/span>{
        private<\/span> Integer num;
        private<\/span> String type;
    }


    \/\/Service<\/span>
    @Service<\/span>
    public<\/span> class<\/span> TestService<\/span> <\/span>{

        public<\/span> Double service<\/span>(TestDTO testDTO)<\/span> throws<\/span> Exception <\/span>{
            if<\/span> (testDTO.getNum() <= 0<\/span>) {
                throw<\/span> new<\/span> Exception(\"\u8f93\u5165\u7684\u6570\u5b57\u9700\u8981\u5927\u4e8e0\"<\/span>);
            }
            if<\/span> (testDTO.getType().equals(\"square\"<\/span>)) {
                return<\/span> Math.pow(testDTO.getNum(), 2<\/span>);
            }
            if<\/span> (testDTO.getType().equals(\"factorial\"<\/span>)) {
                double<\/span> result = 1<\/span>;
                int<\/span> num = testDTO.getNum();
                while<\/span> (num > 1<\/span>) {
                    result = result * num;
                    num -= 1<\/span>;
                }
                return<\/span> result;
            }
            throw<\/span> new<\/span> Exception(\"\u672a\u8bc6\u522b\u7684\u7b97\u6cd5\"<\/span>);
        }
    }


    \/\/Controller<\/span>
    @RestController<\/span>
    public<\/span> class<\/span> TestController<\/span> <\/span>{

        private<\/span> TestService testService;

        @PostMapping<\/span>(\"\/test\"<\/span>)
        public<\/span> Double test<\/span>(@RequestBody TestDTO testDTO)<\/span> <\/span>{
            try<\/span> {
                Double result = this<\/span>.testService.service(testDTO);
                return<\/span> result;
            } catch<\/span> (Exception e) {
                throw<\/span> new<\/span> RuntimeException(e);
            }
        }

        @Autowired<\/span>
        public<\/span> DTOid setTestService<\/span>(TestService testService)<\/span> <\/span>{
            this<\/span>.testService = testService;
        }
    }
    <\/code><\/pre>\n
    \u5982\u679c\u771f\u7684\u6309\u7167\u4e0a\u9762\u6240\u5217\u7684\u5de5\u4f5c\u9879\u6765\u5f00\u53d1 Controller \u4ee3\u7801\u4f1a\u6709\u51e0\u4e2a\u95ee\u9898<\/p>\n
      \n
    1. \n
      \u53c2\u6570\u6821\u9a8c\u8fc7\u591a\u5730\u8026\u5408\u4e86\u4e1a\u52a1\u4ee3\u7801\uff0c\u8fdd\u80cc\u5355\u4e00\u804c\u8d23\u539f\u5219<\/section>\n<\/li>\n
    2. \n
      \u53ef\u80fd\u5728\u591a\u4e2a\u4e1a\u52a1\u4e2d\u90fd\u629b\u51fa\u540c\u4e00\u4e2a\u5f02\u5e38\uff0c\u5bfc\u81f4\u4ee3\u7801\u91cd\u590d<\/section>\n<\/li>\n
    3. \n
      \u5404\u79cd\u5f02\u5e38\u53cd\u9988\u548c\u6210\u529f\u54cd\u5e94\u683c\u5f0f\u4e0d\u7edf\u4e00\uff0c\u63a5\u53e3\u5bf9\u63a5\u4e0d\u53cb\u597d<\/section>\n<\/li>\n<\/ol>\n
      \u6539\u9020 Controller \u5c42\u903b\u8f91<\/span><\/h2>\n
      <\/span>\u7edf\u4e00\u8fd4\u56de\u7ed3\u6784<\/span><\/h3>\n
      \u7edf\u4e00\u8fd4\u56de\u503c\u7c7b\u578b\u65e0\u8bba\u9879\u76ee\u524d\u540e\u7aef\u662f\u5426\u5206\u79bb\u90fd\u662f\u975e\u5e38\u5fc5\u8981\u7684\uff0c\u65b9\u4fbf\u5bf9\u63a5\u63a5\u53e3\u7684\u5f00\u53d1\u4eba\u5458\u66f4\u52a0\u6e05\u6670\u5730\u77e5\u9053\u8fd9\u4e2a\u63a5\u53e3\u7684\u8c03\u7528\u662f\u5426\u6210\u529f\uff08\u4e0d\u80fd\u4ec5\u4ec5\u7b80\u5355\u5730\u770b\u8fd4\u56de\u503c\u662f\u5426\u4e3a null<\/code> \u5c31\u5224\u65ad\u6210\u529f\u4e0e\u5426\uff0c\u56e0\u4e3a\u6709\u4e9b\u63a5\u53e3\u7684\u8bbe\u8ba1\u5c31\u662f\u5982\u6b64\uff09\uff0c\u4f7f\u7528\u4e00\u4e2a\u72b6\u6001\u7801\u3001\u72b6\u6001\u4fe1\u606f\u5c31\u80fd\u6e05\u695a\u5730\u4e86\u89e3\u63a5\u53e3\u8c03\u7528\u60c5\u51b5<\/p>\n
      \/\/\u5b9a\u4e49\u8fd4\u56de\u6570\u636e\u7ed3\u6784<\/span>
      public<\/span> interface<\/span> IResult<\/span> <\/span>{
          Integer getCode<\/span>()<\/span><\/span>;
          String getMessage<\/span>()<\/span><\/span>;
      }

      \/\/\u5e38\u7528\u7ed3\u679c\u7684\u679a\u4e3e<\/span>
      public<\/span> enum<\/span> ResultEnum implements IResult {
          SUCCESS(2001<\/span>, \"\u63a5\u53e3\u8c03\u7528\u6210\u529f\"<\/span>),
          VALIDATE_FAILED(2002<\/span>, \"\u53c2\u6570\u6821\u9a8c\u5931\u8d25\"<\/span>),
          COMMON_FAILED(2003<\/span>, \"\u63a5\u53e3\u8c03\u7528\u5931\u8d25\"<\/span>),
          FORBIDDEN(2004<\/span>, \"\u6ca1\u6709\u6743\u9650\u8bbf\u95ee\u8d44\u6e90\"<\/span>);

          private<\/span> Integer code;
          private<\/span> String message;

          \/\/\u7701\u7565get\u3001set\u65b9\u6cd5\u548c\u6784\u9020\u65b9\u6cd5<\/span>
      }

      \/\/\u7edf\u4e00\u8fd4\u56de\u6570\u636e\u7ed3\u6784<\/span>
      @Data<\/span>
      @NoArgsConstructor<\/span>
      @AllArgsConstructor<\/span>
      public<\/span> class<\/span> Result<\/span><T<\/span>> <\/span>{
          private<\/span> Integer code;
          private<\/span> String message;
          private<\/span> T data;

          public<\/span> static<\/span> <T> Result<T> success<\/span>(T data)<\/span> <\/span>{
              return<\/span> new<\/span> Result<>(ResultEnum.SUCCESS.getCode(), ResultEnum.SUCCESS.getMessage(), data);
          }

          public<\/span> static<\/span> <T> Result<T> success<\/span>(String message, T data)<\/span> <\/span>{
              return<\/span> new<\/span> Result<>(ResultEnum.SUCCESS.getCode(), message, data);
          }

          public<\/span> static<\/span> Result<?> failed() {
              return<\/span> new<\/span> Result<>(ResultEnum.COMMON_FAILED.getCode(), ResultEnum.COMMON_FAILED.getMessage(), null<\/span>);
          }

          public<\/span> static<\/span> Result<?> failed(String message) {
              return<\/span> new<\/span> Result<>(ResultEnum.COMMON_FAILED.getCode(), message, null<\/span>);
          }

          public<\/span> static<\/span> Result<?> failed(IResult errorResult) {
              return<\/span> new<\/span> Result<>(errorResult.getCode(), errorResult.getMessage(), null<\/span>);
          }

          public<\/span> static<\/span> <T> Result<T> instance<\/span>(Integer code, String message, T data)<\/span> <\/span>{
              Result<T> result = new<\/span> Result<>();
              result.setCode(code);
              result.setMessage(message);
              result.setData(data);
              return<\/span> result;
          }
      }
      <\/code><\/pre>\n
      \u7edf\u4e00\u8fd4\u56de\u7ed3\u6784\u540e\uff0c\u5728 Controller \u4e2d\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e86\uff0c\u4f46\u662f\u6bcf\u4e00\u4e2a Controller \u90fd\u5199\u8fd9\u4e48\u4e00\u6bb5\u6700\u7ec8\u5c01\u88c5\u7684\u903b\u8f91\uff0c\u8fd9\u4e9b\u90fd\u662f\u5f88\u91cd\u590d\u7684\u5de5\u4f5c\uff0c\u6240\u4ee5\u8fd8\u8981\u7ee7\u7eed\u60f3\u529e\u6cd5\u8fdb\u4e00\u6b65\u5904\u7406\u7edf\u4e00\u8fd4\u56de\u7ed3\u6784<\/p>\n
      <\/span>\u7edf\u4e00\u5305\u88c5\u5904\u7406<\/span><\/h3>\n
      Spring \u4e2d\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7c7b ResponseBodyAdvice<\/code> \uff0c\u80fd\u5e2e\u52a9\u6211\u4eec\u5b9e\u73b0\u4e0a\u8ff0\u9700\u6c42<\/p>\n
      ResponseBodyAdvice<\/code> \u662f\u5bf9 Controller \u8fd4\u56de\u7684\u5185\u5bb9\u5728 HttpMessageConverter<\/code> \u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u4e4b\u524d\u62e6\u622a\uff0c\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\u64cd\u4f5c\u540e\uff0c\u518d\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002\u90a3\u8fd9\u6837\u5c31\u53ef\u4ee5\u628a\u7edf\u4e00\u5305\u88c5\u7684\u5de5\u4f5c\u653e\u5230\u8fd9\u4e2a\u7c7b\u91cc\u9762\u3002<\/p>\n
      public<\/span> interface<\/span> ResponseBodyAdvice<\/span><T<\/span>> <\/span>{
          boolean<\/span> supports<\/span>(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType)<\/span><\/span>;

          @Nullable<\/span>
          T beforeBodyWrite<\/span>(@Nullable T body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response)<\/span><\/span>;
      }

      <\/code><\/pre>\n
        \n
      • \n
        supports\uff1a\u5224\u65ad\u662f\u5426\u8981\u4ea4\u7ed9 beforeBodyWrite \u65b9\u6cd5\u6267\u884c\uff0cture\uff1a\u9700\u8981\uff1bfalse\uff1a\u4e0d\u9700\u8981<\/section>\n<\/li>\n
      • \n
        beforeBodyWrite\uff1a\u5bf9 response \u8fdb\u884c\u5177\u4f53\u7684\u5904\u7406<\/section>\n<\/li>\n<\/ul>\n
        \/\/ \u5982\u679c\u5f15\u5165\u4e86swagger\u6216knife4j\u7684\u6587\u6863\u751f\u6210\u7ec4\u4ef6\uff0c\u8fd9\u91cc\u9700\u8981\u4ec5\u626b\u63cf\u81ea\u5df1\u9879\u76ee\u7684\u5305\uff0c\u5426\u5219\u6587\u6863\u65e0\u6cd5\u6b63\u5e38\u751f\u6210<\/span>
        @RestControllerAdvice<\/span>(basePackages = \"com.example.demo\"<\/span>)
        public<\/span> class<\/span> ResponseAdvice<\/span> implements<\/span> ResponseBodyAdvice<\/span><Object<\/span>> <\/span>{
            @Override<\/span>
            public<\/span> boolean<\/span> supports<\/span>(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType)<\/span> <\/span>{
                \/\/ \u5982\u679c\u4e0d\u9700\u8981\u8fdb\u884c\u5c01\u88c5\u7684\uff0c\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e9b\u6821\u9a8c\u624b\u6bb5\uff0c\u6bd4\u5982\u6dfb\u52a0\u6807\u8bb0\u6392\u9664\u7684\u6ce8\u89e3<\/span>
                return<\/span> true<\/span>;
            }
          

            @Override<\/span>
            public<\/span> Object beforeBodyWrite<\/span>(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response)<\/span> <\/span>{
                \/\/ \u63d0\u4f9b\u4e00\u5b9a\u7684\u7075\u6d3b\u5ea6\uff0c\u5982\u679cbody\u5df2\u7ecf\u88ab\u5305\u88c5\u4e86\uff0c\u5c31\u4e0d\u8fdb\u884c\u5305\u88c5<\/span>
                if<\/span> (body instanceof<\/span> Result) {
                    return<\/span> body;
                }
                return<\/span> Result.success(body);
            }
        }

        <\/code><\/pre>\n
        \u7ecf\u8fc7\u8fd9\u6837\u6539\u9020\uff0c\u65e2\u80fd\u5b9e\u73b0\u5bf9 Controller \u8fd4\u56de\u7684\u6570\u636e\u8fdb\u884c\u7edf\u4e00\u5305\u88c5\uff0c\u53c8\u4e0d\u9700\u8981\u5bf9\u539f\u6709\u4ee3\u7801\u8fdb\u884c\u5927\u91cf\u7684\u6539\u52a8<\/p>\n
        <\/span>\u5904\u7406 cannot be cast to java.lang.String \u95ee\u9898<\/span><\/h3>\n
        \u5982\u679c\u76f4\u63a5\u4f7f\u7528 ResponseBodyAdvice<\/code>\uff0c\u5bf9\u4e8e\u4e00\u822c\u7684\u7c7b\u578b\u90fd\u6ca1\u6709\u95ee\u9898\uff0c\u5f53\u5904\u7406\u5b57\u7b26\u4e32\u7c7b\u578b\u65f6\uff0c\u4f1a\u629b\u51fa xxx.\u5305\u88c5\u7c7b cannot be cast to java.lang.String<\/code> \u7684\u7c7b\u578b\u8f6c\u6362\u7684\u5f02\u5e38<\/p>\n
        \u5728 ResponseBodyAdvice<\/code> \u5b9e\u73b0\u7c7b\u4e2d debug \u53d1\u73b0\uff0c\u53ea\u6709 String \u7c7b\u578b\u7684 selectedConverterType<\/code> \u53c2\u6570\u503c\u662f org.springframework.http.converter.StringHttpMessageConverter<\/code>\uff0c\u800c\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u7684\u503c\u662f org.springframework.http.converter.json.MappingJackson2HttpMessageConverter<\/code><\/p>\n
          \n
        • \n
          String \u7c7b\u578b<\/section>\n<\/li>\n<\/ul>\n