Question

我想在使用java springboot直接命中方法URL时显示错误消息，所以我使用了try catch异常，但是它不起作用，我收到了我在此问题中提到的错误消息，我们对此表示赞赏或帮助。

当我们点击localhost：8080 / LoginProcess时，我只是需要，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";
        }

    }

错误消息

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

尝试使用，@PostMapping(value = "/loginProcess")或尝试将RequestMapping与方法@RequestMapping(value = "/loginProcess", method = RequestMethod.POST)一起使用

Answer 2

我通过使用@GetMapping创建相同的重复方法来获得分辨率，并且效果很好。现在它重定向到我的自定义错误页面。感谢yali通过评论使我产生了想法。

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

        return "err404";
    }

Answer 3

尝试if( score <= 100 )和public static String scoreToGrade( int score ) { String grade = ""; if( score <= 100 && score >= 90 ) { grade = "A"; } else if( score <= 89 && score >= 80) { grade = "B"; } else if( score <= 79 && score >= 70) { grade = "C"; } else if( score <= 69 && score >= 60) { grade = "D"; } else if( score <= 59 && score >= 50) { grade = "E"; } else if( score <= 49 && score >= 0) { grade = "F"; } else { grade = "Error: score " + score; } return grade; }

@ControllerAdvice

Answer 4

您无法从浏览器发送http发布请求，因此，我建议您使用发布工具进行测试。

Answer 5

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。拦截器会在击中控制器之前执行，因此您可以检查将http方法类型转发给错误jsp

在浏览器中直接点击发布方法网址时显示错误消息

5 个答案: