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————-**
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
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2
3import cn.dawn.day18annotationexception.userexception.UserageException;
4import cn.dawn.day18annotationexception.userexception.UsernameException;
5import org.springframework.stereotype.Controller;
6import org.springframework.web.bind.annotation.ExceptionHandler;
7import org.springframework.web.bind.annotation.RequestMapping;
8import org.springframework.web.servlet.ModelAndView;
9
10import javax.servlet.http.HttpServletRequest;
11import javax.servlet.http.HttpServletResponse;
12
13/**
14 * Created by Dawn on 2018/3/28.
15 */
16@Controller
17public class ZDYExceptionController {
18
19
20 /*作用于这俩个*/
21 @ExceptionHandler({UsernameException.class,UserageException.class})
22 public ModelAndView resolveException(Exception ex) {
23 ModelAndView modelAndView=new ModelAndView();
24 /*返回的异常对象*/
25 modelAndView.addObject("ex",ex);
26 /*判断去那个页面*/
27 if(ex instanceof UsernameException){
28 modelAndView.setViewName("name");
29 }
30 if(ex instanceof UserageException){
31 modelAndView.setViewName("age");
32 }
33
34 return modelAndView;
35 }
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40 @RequestMapping("/annotationException")
41 public String annotationException(String username,Integer userage) throws Exception {
42 if(!username.equals("admin")){
43 throw new UsernameException("登陆名不正确");
44 }
45 if(userage<18){
46 throw new UserageException("未成年，走开");
47 }
48 return "success";
49 }
50}
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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.day18annotationexception"></context:component-scan>
15 <!--视图解析器-->
16 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
17 <property name="prefix" value="/day18/"></property>
18 <property name="suffix" value=".jsp"></property>
19 </bean>
20
21
22</beans>
23
3.修改web.xml的中央调度器的上下文配置路径
4.login.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="${pageContext.request.contextPath}/annotationException" method="post">
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10 用户名:<input name="username">
11 年龄:<input name="userage">
12
13 <input type="submit" value="登录"/>
14</form>
15</body>
16</html>
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下面的内容与上篇博客相同
**
5.UserageException自定义异常**
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2
3/**
4 * Created by Dawn on 2018/3/30.
5 */
6public class UserageException extends Exception {
7 public UserageException() {
8 super();
9 }
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11 public UserageException(String message) {
12 super(message);
13 }
14}
15
**
6.UsernameException自定义异常**
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3/**
4 * Created by Dawn on 2018/3/30.
5 */
6public class UsernameException extends Exception {
7 public UsernameException() {
8 super();
9 }
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11 public UsernameException(String message) {
12 super(message);
13 }
14}
15
7.jsp页面
7.1success.jsp
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2<html>
3<body>
4<%--<img src="image/1.jpg">--%>
5<h2>Success!</h2>
6</body>
7</html>
8
7.2error.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>ERROR</h2>
8<p>${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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7.3age.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>${ex.message}</p>
9服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天
10</body>
11</html>
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7.4name.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>名字错误ERROR</h2>
8<p>${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
