Configuration of web.xml in SSM

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>
  
  <!-- springmvc front controller master scheduler start -->
<servlet>
<servlet-name>springMvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<!--contextConfigLocation is fixed and cannot be changed -->
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- springmvc total scheduler end-->
<!-- spring and mybatis integration load configuration file -->
    <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<!-- spring end-->
<!-- This listener is mainly used to solve the problem of memory leak caused by java.beans.Introspector-->
<listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>
<!-- 配置spring监听器-->
<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
<!-- 解决中文乱码问题 -->
    <filter>  
        <filter-name>characterEncodingFilter</filter-name>  
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
        <init-param>  
            <param-name>encoding</param-name>  
            <param-value>UTF-8</param-value>  
        </init-param>  
        <init-param>  
            <param-name>forceEncoding</param-name>  
            <param-value>true</param-value>  
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>characterEncodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>
<!-- 设置静态文件绕过DispatcherServlet -->
    <servlet-mapping>  
    <servlet-name>default</servlet-name>  
    <url-pattern>*.jpg</url-pattern>  
</servlet-mapping>
    <servlet-mapping>  
    <servlet-name>default</servlet-name>  
    <url-pattern>*.png</url-pattern>  
</servlet-mapping>
<servlet-mapping>  
    <servlet-name>default</servlet-name>  
    <url-pattern>*.gif</url-pattern>  
</servlet-mapping>
<servlet-mapping>  
    <servlet-name>default</servlet-name>  
    <url-pattern>*.js</url-pattern>  
</servlet-mapping>
<servlet-mapping>  
    <servlet-name>default</servlet-name>  
    <url-pattern>*.css</url-pattern>  
</servlet-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

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