Web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--1、配置Spring文件-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:springmvc-servlet.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--2、配置DispatcherServlet，加载SpringMVC的核心（请求分发器/前端控制器）-->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--配置DispatcherServlet要绑定Spring的配置文件-->
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别1：和服务器一起启动-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!-- 2.1将所有请求映射到 DispatcherServlet 进行处理 -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <!--2.2配置url-pattern 路径
            /:只匹配所有的请求，不会匹配jsp等页面
            /*:匹配所有的请求，包括匹配jsp等页面-->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--3、Post请求过滤器-->
    <!--spring提供的characterEncodingFilter配置 -->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <!--观察发现这个类 CharacterEncodingFilter 有一个属性 encoding 所以提供一个initparm以及 value -->
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!--给CharacterEncodingFilter类的对象进行初始化的赋值request.setCharacterEncoding-->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!--响应编码的设置 true 设置response -->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <!--3.1 过滤器对哪些资源进行过滤呀 -->
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>