SpringMVC —— 异常处理器

SpringMVC异常处理的流程：在这里插入图片描述
引用sysExceptionResolver

 <!--配置异常处理器-->
    <bean id="sysExceptionResolver" class="com.fy.exception.SysExceptionResolver"/>

package com.fy.controller;

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

@Controller
@RequestMapping("/exc")
public class excController {
    @RequestMapping("/testException")
    public String testException() throws SysException{
        System.out.println("testException执行了....");
        //模拟异常
        try {
            int a = 10/0;
        } catch (Exception e) {
            //控制台打印异常信息
            e.printStackTrace();
            //抛出自定义异常信息
            throw new SysException("查询所有用户出现的错误....");
        }
        return "success";
    }
}

package com.fy.exception;

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

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

/**
 * 异常处理器
 */
public class SysExceptionResolver implements HandlerExceptionResolver {
    /**
     * 处理异常业务逻辑
     * @param httpServletRequest
     * @param httpServletResponse
     * @param o
     * @param ex
     * @return
     */
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception ex) {
       //获取异常对象
        SysException e =null;
        if(ex instanceof SysException){
            e = (SysException) ex;
        }else {
            e = new SysException("系统正在维护....");
        }
        //创建ModelAndView
        ModelAndView mv = new ModelAndView();
        mv.addObject("errorMsg",e.getMessage());
        mv.setViewName("error");
        return mv;
    }
}

package com.fy.exception;

public class SysException extends Exception {
    private String message;

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

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

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


}

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h3>异常处理</h3>
    <a href="exc/testException">testException</a>
</body>
</html>

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
        ${errorMsg}
</body>
</html>

效果截图：
在这里插入图片描述

速度~70迈

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SpringMVC —— 异常处理器

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