释放双眼，带上耳机，听听看~！
————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：
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3import cn.dawn.day17selfexceptionresolver.userexception.UserageException;
4import cn.dawn.day17selfexceptionresolver.userexception.UsernameException;
5import org.springframework.web.servlet.HandlerExceptionResolver;
6import org.springframework.web.servlet.ModelAndView;
7
8import javax.servlet.http.HttpServletRequest;
9import javax.servlet.http.HttpServletResponse;
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11/**
12 * Created by Dawn on 2018/3/30.
13 */
14public class MyHandlerExceptionResolver implements HandlerExceptionResolver {
15 public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
16 ModelAndView modelAndView=new ModelAndView();
17 /*返回的异常对象*/
18 modelAndView.addObject("ex",ex);
19 /*判断去那个页面*/
20 if(ex instanceof UsernameException){
21 modelAndView.setViewName("name");
22 }
23 if(ex instanceof UserageException){
24 modelAndView.setViewName("age");
25 }
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27 return modelAndView;
28 }
29}
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2.自己的xml大配置文件：
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2<beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xmlns:mvc="http://www.springframework.org/schema/mvc"
5 xmlns:context="http://www.springframework.org/schema/context"
6 xsi:schemaLocation="http://www.springframework.org/schema/beans
7 http://www.springframework.org/schema/beans/spring-beans.xsd
8 http://www.springframework.org/schema/mvc
9 http://www.springframework.org/schema/mvc/spring-mvc.xsd
10 http://www.springframework.org/schema/context
11 http://www.springframework.org/schema/context/spring-context.xsd">
12
13 <!--包扫描器-->
14 <context:component-scan base-package="cn.dawn.day17selfexceptionresolver"></context:component-scan>
15 <!--视图解析器-->
16 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
17 <property name="prefix" value="/day17/"></property>
18 <property name="suffix" value=".jsp"></property>
19 </bean>
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21 <!--自己的异常解析器-->
22 <bean class="cn.dawn.day17selfexceptionresolver.resolver.MyHandlerExceptionResolver"></bean>
23
24</beans>
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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
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3/**
4 * Created by Dawn on 2018/3/30.
5 */
6public class UserageException extends Exception {
7 public UserageException() {
8 super();
9 }
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11 public UserageException(String message) {
12 super(message);
13 }
14}
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5.UsernameException自定义异常
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3/**
4 * Created by Dawn on 2018/3/30.
5 */
6public class UsernameException extends Exception {
7 public UsernameException() {
8 super();
9 }
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11 public UsernameException(String message) {
12 super(message);
13 }
14}
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6.自定义的处理器和处理方法
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3import cn.dawn.day17selfexceptionresolver.userexception.UserageException;
4import cn.dawn.day17selfexceptionresolver.userexception.UsernameException;
5import org.springframework.stereotype.Controller;
6import org.springframework.web.bind.annotation.RequestMapping;
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8/**
9 * Created by Dawn on 2018/3/28.
10 */
11@Controller
12public class ZDYExceptionController {
13 @RequestMapping("/zidingyiException")
14 public String zidingyiException(String username,Integer userage) throws Exception {
15 if(!username.equals("admin")){
16 throw new UsernameException("登陆名不正确");
17 }
18 if(userage<18){
19 throw new UserageException("未成年，走开");
20 }
21 return "success";
22 }
23}
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7.jsp页面
7.1login.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>登录</h2>
8<form action="${pageContext.request.contextPath}/zidingyiException" method="post">
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10 用户名:<input name="username">
11 年龄:<input name="userage">
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13 <input type="submit" value="登录"/>
14</form>
15</body>
16</html>
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7.2success.jsp
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2<html>
3<body>
4<%--<img src="image/1.jpg">--%>
5<h2>Success!</h2>
6</body>
7</html>
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7.3error.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>ERROR</h2>
8<p>${ex.message}</p>
9服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天
10</body>
11</html>
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7.4age.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>年龄错误ERROR</h2>
8<p>${ex.message}</p>
9服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天
10</body>
11</html>
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7.5name.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>名字错误ERROR</h2>
8<p>${ex.message}</p>
9服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天
10</body>
11</html>
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8.启动tomcat，访问login.jsp
