------------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：
<?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="cn.dawn.day17selfexceptionresolver"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/day17/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--自己的异常解析器--> <bean class="cn.dawn.day17selfexceptionresolver.resolver.MyHandlerExceptionResolver"></bean> </beans>
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. */ @Controller public 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" %> <html> <head> <title>Title</title> </head> <body> <h2>登录</h2> <form action="${pageContext.request.contextPath}/zidingyiException" method="post"> 用户名:<input name="username"> 年龄:<input name="userage"> <input type="submit" value="登录"/> </form> </body> </html>
7.2success.jsp
<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %> <html> <body> <%--<img src="image/1.jpg">--%> <h2>Success!</h2> </body> </html>
7.3error.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>Title</title> </head> <body> <h2>ERROR</h2> <p>${ex.message}</p> 服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天 </body> </html>
7.4age.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>Title</title> </head> <body> <h2>年龄错误ERROR</h2> <p>${ex.message}</p> 服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天 </body> </html>
7.5name.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>Title</title> </head> <body> <h2>名字错误ERROR</h2> <p>${ex.message}</p> 服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天 </body> </html>
8.启动tomcat，访问login.jsp
