二、web.xml文件配置 - java开发企业级权限管理系统

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Archetype Created Web Application</display-name>
  <!--负责监听上下文spring-beans的加载-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring beans 配置文件所在目录-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!--路径问题：
    不指定classpath：默认目录在WEB-INF下面
    指定classpath：回到resources目录下面
  -->
  <!-- spring mvc 配置-->
  <servlet>
    <servlet-name>spring</servlet-name>
    <!--请求分发  对应spring-servlet.xml配置文件,前缀spring和servlet一一对应的，
    后缀-servlet是固定的，spring会自动读取按照这个格式定义的文件                -->
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>/</url-pattern>
    <!--此处为什么使用 / 路径型匹配,而不使用 /* 后缀型匹配?
      因为经过视图解析器，返回jsp视图时，不会经过该DispatcherServlet，
      jsp页面请求也不会命中该servlet,jsp容器内置的jsp servlet被调用
    -->
  </servlet-mapping>
  <!-- 过滤器进行项目编码配置 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!--参数配置-->
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <!--强制编码。强制使用utf-8编码-->
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- druid 配置 -->
  <servlet>
    <servlet-name>DruidStatServlet</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    <!--登录验证配置-->
    <init-param>
      <param-name>loginUsername</param-name>
      <param-value>druid</param-value>
    </init-param>
    <init-param>
      <param-name>loginPasswoord</param-name>
      <param-value>druid</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>DruidStatServlet</servlet-name>
    <url-pattern>/sys/druid/*</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>DruidStatFilter</filter-name>
    <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
    <init-param>
      <param-name>exclusions</param-name>
      <param-value>*.js,*.css,*.jpg,*.png,*.ico,*.gif,/sys/druid/*</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>DruidStatFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

原文：https://www.cnblogs.com/wangchengb/p/9011864.html