------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------

 

 

上篇博客相信大家也看到了，自定义异常，用了SimpleMappingExceptionResolver这个解析器，本次要讲的是自定义异常解析器：

自己定义的异常解析器，实现了HandlerExceptionResolver,一会再在xml中配置一道，我把需要改或者新建的三处放在前面，下面的与上篇博客的一样（不过我也放上来），看着来把，活学活用

 

案例

　　1，自定义异常解析器MyHandlerExceptionResolver：

 

package cn.dawn.day17selfexceptionresolver.resolver;import cn.dawn.day17selfexceptionresolver.userexception.UserageException;import cn.dawn.day17selfexceptionresolver.userexception.UsernameException;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Created by Dawn on 2018/3/30. */public class MyHandlerExceptionResolver implements HandlerExceptionResolver {    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {        ModelAndView modelAndView=new ModelAndView();        /*返回的异常对象*/        modelAndView.addObject("ex",ex);        /*判断去那个页面*/        if(ex instanceof UsernameException){            modelAndView.setViewName("name");        }        if(ex instanceof UserageException){            modelAndView.setViewName("age");        }        return modelAndView;    }}

 

　　2.自己的xml大配置文件：

 

 

　　3.讲web.xml中央调度器的上下文配置位置改为你现在这个配置xml

 

　　下面的上篇博客就有，不过我也再放一份，ok

　　4.UserageException自定义异常

 

package cn.dawn.day17selfexceptionresolver.userexception;/** * Created by Dawn on 2018/3/30. */public class UserageException extends Exception {    public UserageException() {        super();    }    public UserageException(String message) {        super(message);    }}

 

　　5.UsernameException自定义异常

 

package cn.dawn.day17selfexceptionresolver.userexception;/** * Created by Dawn on 2018/3/30. */public class UsernameException extends Exception {    public UsernameException() {        super();    }    public UsernameException(String message) {        super(message);    }}

 

　　6.自定义的处理器和处理方法

 

package cn.dawn.day17selfexceptionresolver;import cn.dawn.day17selfexceptionresolver.userexception.UserageException;import cn.dawn.day17selfexceptionresolver.userexception.UsernameException;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;/** * Created by Dawn on 2018/3/28. */@Controllerpublic class ZDYExceptionController {    @RequestMapping("/zidingyiException")    public String zidingyiException(String username,Integer userage) throws Exception {        if(!username.equals("admin")){            throw new UsernameException("登陆名不正确");        }        if(userage<18){            throw new UserageException("未成年，走开");        }        return "success";    }}

 

　　7.jsp页面

　　　　7.1login.jsp

 

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>    
登录
     
          用户名:
          年龄:
          
      
     

 

　　　　7.2success.jsp

 

<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %><%----%>
Success!

 

　　　　7.3error.jsp

 

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>    
ERROR
${ex.message}
服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天

 

　　　　7.4age.jsp

 

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>    
年龄错误ERROR
${ex.message}
服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天

 

　　　　7.5name.jsp

 

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>    
名字错误ERROR
${ex.message}
服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天

 

 

 

　　8.启动tomcat，访问login.jsp