监听器litener是报错的，我在怀疑xmls有问题，但又不清楚；


 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 3              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4              xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 5              version="3.1">
 6     <display-name>SpringMVC3Demo</display-name>
 7     <!--设置过滤器-->
 8     <filter>
 9         <filter-name>CharacterEncoding</filter-name>
10         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
11         <init-param>
12             <param-name>encoding</param-name>
13             <param-value>UTF-8</param-value>
14         </init-param>
15         <init-param>
16             <param-name>forceEncoding</param-name>
17             <param-value>true</param-value>
18         </init-param>
19     </filter>
20     <filter-mapping>
21         <filter-name>CharacterEncoding</filter-name>
22         <url-pattern>/*</url-pattern>
23     </filter-mapping>
24 
25     <!--Spring配置文件开始-->
26     <context-param>
27         <param-name>contextConfigLocation</param-name>
28         <param-value>classpath:springcontext-config.xml</param-value>
29     </context-param>
30     <listener>org.springframework.web.context.ContextLoaderListener</listener>
31 </web-app>