< url-pattern>/</url-pattern> 会匹配到/login这样的路径型url，不会匹配到模式为*.jsp这样的后缀型url
< url-pattern>/*</url-pattern> 会匹配所有url：路径型的和后缀型的url(包括/login,*.jsp,*.js和*.html等)
因为 springmvc 要使用DispatcherServlet类 处理 前端的 请求，所以配置为< url-pattern > / </ url-pattern > 将路径型url 交给springMVC处理
例如 中文乱码处理、shiro 安全认证处理需要处理所有的 url ，所以配置为< url-pattern > /* </ url-pattern >
< url-pattern > / </ url-pattern > 不会匹配到*.jsp，即：*.jsp不会进入spring的 DispatcherServlet类 。
< url-pattern > /* </ url-pattern > 会匹配*.jsp，会出现返回jsp视图时再次进入spring的DispatcherServlet 类，导致找不到对应的controller所以报404错。
例某 web.xml文件配置：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> 3 ???<!-- 配置spring ??上下文参数 --> 4 ??<context-param> 5 ????<param-name>contextConfigLocation</param-name> 6 ????<param-value>classpath:applicationContext.xml</param-value> 7 ??</context-param> 8 ???<!-- 配置spring ---- 配置侦听器 --> 9 ??<listener>10 ????<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>11 ??</listener>12 ??<!-- 配置springmvc ?核心控制器 -->13 ??<servlet>14 ????<servlet-name>springDispatcherServlet</servlet-name>15 ????<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>16 ????<init-param>17 ??????<param-name>contextConfigLocation</param-name>18 ??????<param-value>classpath:springMVC.xml</param-value>19 ????</init-param>20 ????<load-on-startup>1</load-on-startup>21 ??</servlet>22 ??<servlet-mapping>23 ????<servlet-name>springDispatcherServlet</servlet-name>24 ????<url-pattern>/</url-pattern>25 ??</servlet-mapping>26 ??<!-- 配置shiro认证过滤器 -->27 ??<filter>28 ????<filter-name>shiroFilter</filter-name>29 ????<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>30 ????<init-param>31 ??????<param-name>targetFilterLifecycle</param-name>32 ??????<param-value>true</param-value>33 ????</init-param>34 ??</filter>35 ??<filter-mapping>36 ????<filter-name>shiroFilter</filter-name>37 ????<url-pattern>/*</url-pattern>38 ??</filter-mapping>39 ??<!-- 配置编码过滤器（只对post方法） -->40 ??<filter>41 ????<filter-name>CharacterEncodingFilter</filter-name>42 ????<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>43 ????<init-param>44 ??????<param-name>encoding</param-name>45 ??????<param-value>UTF-8</param-value>46 ????</init-param>47 ????<init-param>48 ??????<param-name>forceRequestEncoding</param-name>49 ??????<param-value>true</param-value>50 ????</init-param>51 ????<init-param>52 ??????<param-name>forceResponseEncoding</param-name>53 ??????<param-value>true</param-value>54 ????</init-param>55 ??</filter>56 ??<filter-mapping>57 ????<filter-name>CharacterEncodingFilter</filter-name>58 ????<url-pattern>/*</url-pattern>59 ??</filter-mapping>60 </web-app>
web.xml中 /和/*的区别
原文地址：https://www.cnblogs.com/mumu122GIS/p/10161725.html