Spring MVC @ExceptionHandler Example【转】

自定义类：

CustomGenericException.java

package com.mkyong.web.exception;

public class CustomGenericException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    private String errCode;
    private String errMsg;

    public String getErrCode() {
        return errCode;
    }

    public void setErrCode(String errCode) {
        this.errCode = errCode;
    }

    public String getErrMsg() {
        return errMsg;
    }

    public void setErrMsg(String errMsg) {
        this.errMsg = errMsg;
    }

    public CustomGenericException(String errCode, String errMsg) {
        this.errCode = errCode;
        this.errMsg = errMsg;
    }

}

3. Spring Controller

A Spring controller, review the execution-flows below :

If user provide a /error request, it throws “CustomGenericException”, and the handleCustomException() method will be fired.
If user provide a /io-error request, it throws “IOException”, and the handleAllException() method will be fired.

MainController.java

package com.mkyong.web.controller;

import java.io.IOException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.mkyong.web.exception.CustomGenericException;

@Controller
public class MainController {

    @RequestMapping(value = "/{type:.+}", method = RequestMethod.GET)
    public ModelAndView getPages(@PathVariable("type") String type)
        throws Exception {

      if ("error".equals(type)) {
        // go handleCustomException
        throw new CustomGenericException("E888", "This is custom message");
      } else if ("io-error".equals(type)) {
        // go handleAllException
        throw new IOException();
      } else {
        return new ModelAndView("index").addObject("msg", type);
      }

    }

    @ExceptionHandler(CustomGenericException.class)
    public ModelAndView handleCustomException(CustomGenericException ex) {

        ModelAndView model = new ModelAndView("error/generic_error");
        model.addObject("errCode", ex.getErrCode());
        model.addObject("errMsg", ex.getErrMsg());

        return model;

    }

    @ExceptionHandler(Exception.class)
    public ModelAndView handleAllException(Exception ex) {

        ModelAndView model = new ModelAndView("error/generic_error");
        model.addObject("errMsg", "this is Exception.class");

        return model;

    }

}

4. JSP Pages

pages/index.jsp

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<body>
    <h2>Spring MVC @ExceptionHandler Example</h2>

    <c:if test="${not empty msg}">
        <h2>${msg}</h2>
    </c:if>
    
</body>
</html>

pages/error/generic_error.jsp

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<body>

    <c:if test="${not empty errCode}">
        <h1>${errCode} : System Errors</h1>
    </c:if>
    
    <c:if test="${empty errCode}">
        <h1>System Errors</h1>
    </c:if>

    <c:if test="${not empty errMsg}">
        <h2>${errMsg}</h2>
    </c:if>
    
</body>
</html>

转：https://mkyong.com/spring-mvc/spring-mvc-exceptionhandler-example/

道法自然