直接在浏览器中点击 post 方法 url 时显示错误消息

Question

我想在使用 java springboot 直接点击 post 方法 url 时显示错误消息，所以我使用了 try catch 异常但它不起作用，我收到了我在这个问题中提到的错误消息，感谢帮助或建议。

我只是在我们点击 localhost:8080/LoginProcess 时需要，url 我需要显示 error404 html 页面。

控制器方法

@PostMapping("/LoginProcess")
    public String LoginProcess(@ModelAttribute("customer") Customer thecustomer,HttpSession session) {

        try {

            Customer result = customerservice.Login_service(thecustomer.getUserName(),thecustomer.getPassword());

            if(result==null)
            {
                return "login";
            }
            else if(result.getRole().equals("1"))
            {
                session.setAttribute("l_uname",result.getUserName() );
                session.setAttribute("l_pwd",result.getPassword() );
                return "admindash";
            }
            else
            {
                session.setAttribute("l_uname",result.getUserName() );
                session.setAttribute("l_pwd",result.getPassword() );
                return "customerdash";
            }

        }catch(Exception e) {
            return "err404";
        }

    }

错误信息

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sun Mar 03 16:18:46 IST 2019
There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'GET' not supported
org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'GET' not supported
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:200)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:422)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:368)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:65)
    at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:401)
    at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1231)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1014)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

Answer 1

我通过使用@GetMapping 创建相同的重复方法得到了解决方案，它工作正常。现在它重定向到我的自定义错误页面。感谢 yali 通过 cmets 给我的想法。

@GetMapping("/LoginProcess")
    public String LoginProcess() {

        return "err404";
    }

Answer 2

试试@ControllerAdvice和ExceptionHandler

@ControllerAdvice
public class DemoControllerAdvice {

    @ExceptionHandler(HttpRequestMethodNotSupportedException.class)
    public ResponseEntity<String> handleIOException(HttpRequestMethodNotSupportedException ex) {
        // prepare responseEntity
        return ResponseEntity.notFound().build();
    }

}

Answer 3

我不确定 Spring 是否提供了任何实现。但是您可以通过编写自己的拦截器来处理它。拦截器将在到达控制器之前执行，因此您可以检查 http 方法类型，将其转发到错误 jsp

Answer 4

你不能从浏览器发送http post请求，所以我建议你使用post man工具来测试。

Answer 5

尝试使用 @PostMapping(value = "/loginProcess") 或尝试使用 RequestMapping 方法 @RequestMapping(value = "/loginProcess", method = RequestMethod.POST)