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使用 Spring REST API [Spring MVC]

设想：

当请求到达时EmployeeController，如果它属于特定逻辑，则强制将请求/响应转发到另一个 URI。控制器方法已RequestMapping设置为“ RequestMethod.POST”，并且目标控制器 -SpecialController具有 已设置为“ ”的method名称invalidRequest()RequestMappingRequestMethod.GET

员工控制器：

@RestController
@RequestMapping(value = "/employee")
public class EmployeeController {

    String res = null;

    @RequestMapping(value = "/update", method = RequestMethod.POST)
    public String updateEmployeeDetails(HttpServletRequest httpRequest, HttpServletResponse httpResponse,
            @Valid @RequestBody Employee emp) throws ServletException, IOException {
         // based on logic, forward the request to a different controller that handles invalid request

    if( ...) { // condition checking
        RequestDispatcher requestDispatcher = httpRequest.getServletContext().getRequestDispatcher("/invalidRequest");
        requestDispatcher.forward(httpRequest, httpResponse);

    }

   if(..someother condition..) {
        String res = "something";
   }
return res;

目标控制器：

@RestController
    @RequestMapping(value = "/invalidRequest")
    public class SpecialController {

        @RequestMapping(value = "", method = RequestMethod.GET)
        public String invalidRequest(HttpServletRequest httpRequest, HttpServletResponse httpResponse) {
            httpResponse.setStatus(401);
            return "invalidRequest";
        }

    }

问题： 不一致问题[实际问题]：

在 90% 的情况下，这是有效的，但很少有几次，我得到以下错误。如果我总是收到这个错误，那么它会有意义，我会有下面提到的“可能的修复”但是因为它在大多数时候都在工作，而只是有时不工作，我需要你的帮助来找出原因?

org.springframework.web.HttpRequestMethodNotSupportedException：在 org.springframework.web.servlet.handler.AbstractHandlerMethodMapping 的 org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:198) 不支持请求方法“POST” .lookupHandlerMethod(AbstractHandlerMethodMapping.java:286) 在 org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:233) 在 org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:56) ) 在 org.springframework.web.servlet.DispatcherServlet 的 org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:300)。getHandler(DispatcherServlet.java:1101) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:916) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) at org.springframework .web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) 在 org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)doPost(FrameworkServlet.java:863)doPost(FrameworkServlet.java:863)

如果错误一致，可能的修复：

@RestController
    @RequestMapping(value = "/invalidRequest")
    public class SpecialController {

        @RequestMapping(value = "", method = RequestMethod.GET)
        public String invalidRequest(HttpServletRequest httpRequest, HttpServletResponse httpResponse) {
            httpResponse.setStatus(401);
            return "invalidRequest";
        }

        @RequestMapping(value = "", method = RequestMethod.POST)
        public String invalidRequest2(HttpServletRequest httpRequest, HttpServletResponse httpResponse) {
            return invalidRequest(httpRequest, httpResponse);
        }

    }
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