原理：
1.编写自定义异常类(做提示信息的)
package com.jh.exception;
/**自定义异常类*/
public class SysException extends Exception {
//存储提示信息
private String message;
@Override
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public SysException(String message) {
this.message = message;
}
}
2. 编写异常处理器
package com.jh.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 {
@Override
/**处理异常业务逻辑*/
public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
//获取到异常对象
SysException ex=null;
if (e instanceof SysException) {
ex= (SysException) e;
}else{
ex=new SysException("系统正在维护......");
}
//创建ModelAndView对象
ModelAndView mv = new ModelAndView();
//存到request域，将getMessage存到errorMsg
mv.addObject("errorMsg",e.getMessage());
//跳转到error.jsp
mv.setViewName("error");
return mv;
}
}
3. 配置异常处理器(跳转到提示页面)
<!--配置异常处理器-->
<bean id="SysExceptionResolver" class="com.jh.exception.SysExceptionResolver"></bean>
4. 基本程序
控制层controller
package com.jh.controller;
import com.jh.exception.SysException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**异常处理*/
@Controller
@RequestMapping(path = "/user")
public class UserController {
@RequestMapping("testException")
public String testException() throws SysException {
System.out.println("testException方法执行......");
try {
//模拟异常
int a=10/0;
} catch (Exception e) {
//打印异常信息到控制台输出
e.printStackTrace();
//抛出自定义异常信息
throw new SysException("查询所有用户出现了错误。。。");
}
return "success";
}
}
跳转error页面
<%--
Date: 2020/2/29 0029,Time: 21:20
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${errorMsg}
</body>
</html>
