------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
自定义异常，大家都会，对吧，无非就是继承异常类等操作，很简单，我就不多扯皮了，但是在xml配置文件中有个不同的操作，我一会重点列出来
案例开始：
1.自定义异常类：UserageException
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); } }
2.自定义异常类：UsernameException
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); } }
3.定义处理器和处理方法：
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"; } }
在自己的xml大配置中：SimpleMappingExceptionResolver配一个exceptionMappings
<?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.day16exceptionhigh"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/day16/"></property> <property name="suffix" value=".jsp"></property> </bean> <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <!--默认出现异常跳转的页面--> <property name="defaultErrorView" value="error"></property> <!--这个可以注入异常对象，就像catch参数里的(Exception ex)一样--> <property name="exceptionAttribute" value="ex"></property> <!--自定义的异常--> <property name="exceptionMappings"> <props> <prop key="cn.dawn.day16exceptionhigh.userexception.UserageException">age</prop> <prop key="cn.dawn.day16exceptionhigh.userexception.UsernameException">name</prop> </props> </property> </bean> </beans>
上面标红的是重中之重
4.将web.xml的中央调度器上下文配置位置改为上面新的那个xml
5.jsp页面
5.1age.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>${ex.message}</p> 服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天 </body> </html>
5.2name.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>Title</title> </head> <body> <h2>名字错误ERROR</h2> <p>${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>
5.3login.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="${pageContext.request.contextPath}/zidingyiException" method="post"> 用户名:<input name="username"> 年龄:<input name="userage"> <input type="submit" value="登录"/> </form> </body> </html>
5.4success.jsp
<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %> <html> <body> <%--<img src="image/1.jpg">--%> <h2>Success!</h2> </body> </html>
5.5error.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>Title</title> </head> <body> <h2>ERROR</h2> <p>${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>
6.启动tomcat访问login.jsp