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————-
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
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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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2.自定义异常类：UsernameException
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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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3.定义处理器和处理方法：
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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;
7
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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在自己的xml大配置中：SimpleMappingExceptionResolver配一个exceptionMappings
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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.day16exceptionhigh"></context:component-scan>
15 <!--视图解析器-->
16 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
17 <property name="prefix" value="/day16/"></property>
18 <property name="suffix" value=".jsp"></property>
19 </bean>
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21 <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
22 <!--默认出现异常跳转的页面-->
23 <property name="defaultErrorView" value="error"></property>
24 <!--这个可以注入异常对象，就像catch参数里的(Exception ex)一样-->
25 <property name="exceptionAttribute" value="ex"></property>
26
27 <!--自定义的异常-->
28 <property name="exceptionMappings">
29 <props>
30 <prop key="cn.dawn.day16exceptionhigh.userexception.UserageException">age</prop>
31 <prop key="cn.dawn.day16exceptionhigh.userexception.UsernameException">name</prop>
32 </props>
33 </property>
34 </bean>
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36</beans>
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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
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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>${ex.message}</p>
9服务器被猴子砍了，攻城狮在抢修中，还杀了个程序猿祭天
10</body>
11</html>
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5.2name.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>名字错误ERROR</h2>
8<p>${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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5.3login.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="${pageContext.request.contextPath}/zidingyiException" method="post">
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10 用户名:<input name="username">
11 年龄:<input name="userage">
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13 <input type="submit" value="登录"/>
14</form>
15</body>
16</html>
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5.4success.jsp
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2<html>
3<body>
4<%--<img src="image/1.jpg">--%>
5<h2>Success!</h2>
6</body>
7</html>
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5.5error.jsp
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>ERROR</h2>
8<p>${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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6.启动tomcat访问login.jsp
