自定义异常处理器和系统异常处理器的提升版可以实现相同的功能，但是使用的方法不同，自定义异常处理器可以不用在配置文件中配置name多东西，只需要一个异常处理器就可以，有需要的话也可以配置一个视图解析器，但是包扫描器是必须的
先定义一个类让他实现 HandlerExceptionResolver 接口
package demo14SelfException; import org.springframework.web.servlet.HandlerExceptionResolver; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Created by mycom on 2018/3/30. */ public class MyHandlerExceptionResolver implements HandlerExceptionResolver { /** * 解析异常 * @param httpServletRequest * @param httpServletResponse * @param o * @param ex * @return */ public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception ex) { ModelAndView mv=new ModelAndView(); mv.addObject("ex",ex);//保存的数据，在页面上用EL表达式展示错误信息 //如果不满足下面两个条件，就走这个默认的页面 mv.setViewName("error"); //判断异常类型 是用户名异常就到用户名异常类中是年龄异常就到年龄异常类中 if(ex instanceof NameException){ //指定特定的异常页面 mv.setViewName("nameException"); } if(ex instanceof AgeException){ mv.setViewName("ageException"); } //最后返回ModelAndView return mv; } }
在这个类中需要两个异常类NameException和AgeException
package demo14SelfException; /** * Created by mycom on 2018/3/30. */ public class NameException extends Exception { public NameException() { super(); } public NameException(String message) { super(message); } }
package demo14SelfException; /** * Created by mycom on 2018/3/30. */ public class AgeException extends Exception { public AgeException() { super(); } public AgeException(String message) { super(message); } }
在异常控制器中
package demo14SelfException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; /** * Created by mycom on 2018/3/30. */ @Controller public class ExceptionController { @RequestMapping("/first") public String doFirst(String name,int age) throws Exception { //根据异常的不同返回不同的页面 if(!name.equals("admin")){ //如果用户名输入不正确，走姓名异常这个类 throw new NameException("用户名异常"); } if(age>60){ throw new AgeException("年龄不符合"); } //最后成功的话就走成功的页面 return "success"; } }
配置文件中
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--包扫描器--> <context:component-scan base-package="demo14SelfException"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/error/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--异常处理器 自己定义的类--> <bean class="demo14SelfException.MyHandlerExceptionResolver"></bean> </beans>
需要的页面
登录页面
<%-- Created by IntelliJ IDEA. User: mycom Date: 2018/3/26 Time: 11:57 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> <h2>登录</h2> <form action="${pageContext.request.contextPath}/first" method="post"> 用户名：<input type="text" name="name" value="${name}"/> 年龄：<input type="text" name="age" value="${age}"/> 出生日期:<input type="text" name="birthday"/> <input type="submit" value="提交"> </form> </body> </html>
普通错误页面
<%-- Created by IntelliJ IDEA. User: mycom Date: 2018/3/26 Time: 11:57 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> <h2>出错了！！！！</h2> ${ex.message} </body> </html>
成功页面
<%-- Created by IntelliJ IDEA. User: mycom Date: 2018/3/26 Time: 11:57 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> ${username}登录成功！ </body> </html>
姓名错误
<%-- Created by IntelliJ IDEA. User: mycom Date: 2018/3/30 Time: 12:35 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> 姓名不符合 ${ex.message} </body> </html>
年龄错误
<%-- Created by IntelliJ IDEA. User: mycom Date: 2018/3/30 Time: 12:35 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> 年龄不符合 ${ex.message} </body> </html>