< url-pattern>/</url-pattern> 會匹配到/login這樣的路徑型url，不會匹配到模式為*.jsp這樣的后綴型url
< url-pattern>/*</url-pattern> 會匹配所有url：路徑型的和后綴型的url(包括/login,*.jsp,*.js和*.html等)
因為 springmvc 要使用DispatcherServlet類 處理 前端的 請求，所以配置為< url-pattern > / </ url-pattern > 將路徑型url 交給springMVC處理
例如 中文亂碼處理、shiro 安全認證處理需要處理所有的 url ，所以配置為< url-pattern > /* </ url-pattern >
< url-pattern > / </ url-pattern > 不會匹配到*.jsp，即：*.jsp不會進入spring的 DispatcherServlet類 。
< url-pattern > /* </ url-pattern > 會匹配*.jsp，會出現返回jsp視圖時再次進入spring的DispatcherServlet 類，導致找不到對應的controller所以報404錯。
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 上下文參數 --> 4 <context-param> 5 <param-name>contextConfigLocation</param-name> 6 <param-value>classpath:applicationContext.xml</param-value> 7 </context-param> 8 <!-- 配置spring ---- 配置偵聽器 --> 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認證過濾器 --> 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 <!-- 配置編碼過濾器（只對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>