------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
注解的方法实现异常解析，话不多说，直接搞起，和以前一样的习惯，和上篇博客一样的代码放后面，不一样的在前面
案例：
1.自定义处理器和处理方法
package cn.dawn.day18annotationexception; import cn.dawn.day18annotationexception.userexception.UserageException; import cn.dawn.day18annotationexception.userexception.UsernameException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Created by Dawn on 2018/3/28. */ @Controller public class ZDYExceptionController { /*作用于这俩个*/ @ExceptionHandler({UsernameException.class,UserageException.class}) public ModelAndView resolveException(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; } @RequestMapping("/annotationException") public String annotationException(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"; } }
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.day18annotationexception"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/day18/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
3.修改web.xml的中央调度器的上下文配置路径
4.login.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="${pageContext.request.contextPath}/annotationException" method="post"> 用户名:<input name="username"> 年龄:<input name="userage"> <input type="submit" value="登录"/> </form> </body> </html>
下面的内容与上篇博客相同
5.UserageException自定义异常
package cn.dawn.day17selfexceptionresolver.userexception;
/**
* Created by Dawn on 2018/3/30.
*/
public class UserageException extends Exception {
public UserageException() {
super();
}
public UserageException(String message) {
super(message);
}
}
6.UsernameException自定义异常
package cn.dawn.day17selfexceptionresolver.userexception;
/**
* Created by Dawn on 2018/3/30.
*/
public class UsernameException extends Exception {
public UsernameException() {
super();
}
public UsernameException(String message) {
super(message);
}
}
7.jsp页面
7.1success.jsp
<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %> <html> <body> <%--<img src="image/1.jpg">--%> <h2>Success!</h2> </body> </html>
7.2error.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>ERROR</h2>
<p>${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>
7.3age.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>${ex.message}</p>
服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天
</body>
</html>
7.4name.jsp
<%@ page pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>名字错误ERROR</h2>
<p>${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