1.异常处理的思路

笔记SpringMVC中异常处理问题_jsp

笔记SpringMVC中异常处理问题_exception_02

2.实现步骤

2.1编写异常类

package com.xiao.exception;

/**
 * @_PackageName:com.xiao.exception
 * @_ClassName:SysException
 * @_Description:自定义异常类
 * @_Author：笑老二
 * @_data 2020/5/11 11:06
 */
public class SysException extends Exception {
    //异常提示信息
    private String message;

    public SysException(String message) {
        this.message = message;
    }

    @Override
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

2.2编写异常类的controller（处理器）

package com.xiao.exception;

import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @_PackageName:com.xiao.exception
 * @_ClassName:SysExceptionController
 * @_Description:自定义异常处理器
 * @_Author：笑老二
 * @_data 2020/5/11 11:05
 */

public class SysExceptionController implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        SysException exception = null;
        //判断错误类型是否一样
        if (e instanceof SysException){
            //类型一样
            exception = (SysException)e;
        }else {
            exception = new SysException("联系管理员");
        }
        //存入信息到ModelAndView
        ModelAndView modelAndView = new ModelAndView();
        //存入错误信息
        modelAndView.addObject("message",exception.getMessage());
        //跳转JSP页面
        modelAndView.setViewName("error");
        return modelAndView;
    }
}

2.3编写JSP

2.3.1跳转的页面

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/5/11
  Time: 10:42
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <a href="user/testException">testException</a>
</body>
</html>

2.3.2错误页面

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/5/11
  Time: 11:12
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    ${message }
</body>
</html>

2.4前端控制器编写

package com.xiao.controller;

import com.xiao.exception.SysException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @_PackageName:com.xiao.controller
 * @_ClassName:Controller
 * @_Description:
 * @_Author：笑老二
 * @_data 2020/5/11 10:38
 */
@Controller
@RequestMapping("/user")
public class HelloController {
    @RequestMapping("/testException")
    public String testException() throws SysException {
        System.out.println("testException正在运行");
        try {
            int a = 1/0;
        } catch (Exception e) {
            //打印错误到控制台
            e.printStackTrace();
            //
            throw new SysException("用户信息错误....");
        }
        return "success";
    }
}

2.5配置异常处理器

笔记SpringMVC中异常处理问题_jsp_03

2.6结果

2.6.1控制台结果

笔记SpringMVC中异常处理问题_jsp_04

2.6.2页面结果

笔记SpringMVC中异常处理问题_java_05