1        <!-- 初始化 DispatcherServlet时，该框架在 web应用程序WEB-INF目录中寻找一个名为[servlet-名称]-servlet.xml的文件，
 2                 并在那里定义相关的Beans，重写在全局中定义的任何Beans -->
 3           <servlet>
 4             <servlet-name>springMybatis</servlet-name>
 5             <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 6             <load-on-startup>1</load-on-startup>
 7           </servlet>
 8           <servlet-mapping>
 9             <servlet-name>springMybatis</servlet-name>
10             <!-- 所有的的请求，都会被DispatcherServlet处理 -->
11             <url-pattern>/</url-pattern>
12           </servlet-mapping>

1         <!--　该servlet为tomcat,jetty等容器提供,将静态资源映射从/改为/static/目录，如原来访问　http://localhost/foo.css　,现在http://localhost/static/foo.css　-->
2         <!-- 不拦截静态文件 -->
3         <servlet-mapping>
4             <servlet-name>default</servlet-name>
5             <url-pattern>/js/*</url-pattern>
6             <url-pattern>/css/*</url-pattern>
7             <url-pattern>/images/*</url-pattern>
8             <url-pattern>/fonts/*</url-pattern>
9         </servlet-mapping>

1     <mvc:resources mapping="/js/**" location="/static_resources/javascript/"/>
2     <mvc:resources mapping="/styles/**" location="/static_resources/css/"/>
3     <mvc:resources mapping="/images/**" location="/static_resources/images/"/>  

 1     <!--配置拦截器, 多个拦截器,顺序执行 -->
 2     <mvc:interceptors>
 3         <mvc:interceptor>
 4             <!-- 匹配的是url路径， 如果不配置或/**,将拦截所有的Controller -->
 5             <mvc:mapping path="/" />
 6             <mvc:mapping path="/user/**" />
 7             <mvc:mapping path="/test/**" />
 8             <bean class="com.alibaba.interceptor.CommonInterceptor"></bean>
 9         </mvc:interceptor>
10         <!-- 当设置多个拦截器时，先按顺序调用preHandle方法，然后逆序调用每个拦截器的postHandle和afterCompletion方法 -->
11     </mvc:interceptors>

 1 /**
 2  *
 3  */
 4 package com.alibaba.interceptor;
 5
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8
 9 import org.slf4j.Logger;
10 import org.slf4j.LoggerFactory;
11 import org.springframework.web.servlet.ModelAndView;
12 import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
13
14 import com.alibaba.util.RequestUtil;
15
16
17 /**
18  * @author tfj
19  * 2014-8-1
20  */
21 public class CommonInterceptor extends HandlerInterceptorAdapter{
22     private final Logger log = LoggerFactory.getLogger(CommonInterceptor.class);
23     public static final String LAST_PAGE = "com.alibaba.lastPage";
24     /*
25      * 利用正则映射到需要拦截的路径
26
27     private String mappingURL;
28
29     public void setMappingURL(String mappingURL) {
30                this.mappingURL = mappingURL;
31     }
32   */
33     /**
34      * 在业务处理器处理请求之前被调用
35      * 如果返回false
36      *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
37      * 如果返回true
38      *    执行下一个拦截器,直到所有的拦截器都执行完毕
39      *    再执行被拦截的Controller
40      *    然后进入拦截器链,
41      *    从最后一个拦截器往回执行所有的postHandle()
42      *    接着再从最后一个拦截器往回执行所有的afterCompletion()
43      */
44     @Override
45     public boolean preHandle(HttpServletRequest request,
46             HttpServletResponse response, Object handler) throws Exception {
47         if ("GET".equalsIgnoreCase(request.getMethod())) {
48             RequestUtil.saveRequest();
49         }
50         log.info("==============执行顺序: 1、preHandle================");
51         String requestUri = request.getRequestURI();
52         String contextPath = request.getContextPath();
53         String url = requestUri.substring(contextPath.length());
54
55         log.info("requestUri:"+requestUri);
56         log.info("contextPath:"+contextPath);
57         log.info("url:"+url);
58
59         String username =  (String)request.getSession().getAttribute("user");
60         if(username == null){
61             log.info("Interceptor：跳转到login页面！");
62             request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
63             return false;
64         }else
65             return true;
66     }
67
68     /**
69      * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
70      * 可在modelAndView中加入数据，比如当前时间
71      */
72     @Override
73     public void postHandle(HttpServletRequest request,
74             HttpServletResponse response, Object handler,
75             ModelAndView modelAndView) throws Exception {
76         log.info("==============执行顺序: 2、postHandle================");
77         if(modelAndView != null){  //加入当前时间
78             modelAndView.addObject("var", "测试postHandle");
79         }
80     }
81
82     /**
83      * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等
84      *
85      * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
86      */
87     @Override
88     public void afterCompletion(HttpServletRequest request,
89             HttpServletResponse response, Object handler, Exception ex)
90             throws Exception {
91         log.info("==============执行顺序: 3、afterCompletion================");
92     }
93
94 }