------------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
