web.xml

<?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">
    <!-- 配置spring -->
    <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 如果applicationContext.xml不在web-info下则要配置 -->
    <context-param>
    <param-name>contextConfigLocation</param-name><!--contextConfigLocation名不能改 -->
    <param-value>classpath:config/applicationContext.xml</param-value>
    </context-param>
    <!-- 配置spring mvc -->
    <servlet>
        <servlet-name>qq</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 如果qq-servlet.xml放在web-info文件夹下则不用配置,contextConfigLocation名不能改 -->
        <init-param>
        <param-name>contextConfigLocation</param-name> 
        <param-value>classpath:config/springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>qq</servlet-name>
        <url-pattern>*.do</url-pattern><!-- 是spring mvc开发习惯要.do结尾，struts要用.action -->
    </servlet-mapping>
    <!-- spring mvc处理乱码 -->
    <filter>
    <filter-name>bm</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!-- 设置编码参数 -->
    <init-param>
    <param-name>encoding</param-name><!--encoding不能变  -->
    <param-value>utf-8</param-value>
    </init-param>
    </filter>
    <filter-mapping>
    <filter-name>bm</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>
    <display-name></display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

原文链接：https://www.jianshu.com/p/9e20b6b55f6b