<!-- 初始化 DispatcherServlet時，該框架在 web應用程序WEB-INF目錄中尋找一個名為[servlet-名稱]-servlet.xml的文件， 
     并在那里定義相關(guān)的Beans，重寫在全局中定義的任何Beans --> 
  <servlet> 
   <servlet-name>springMybatis</servlet-name> 
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
   <load-on-startup>1</load-on-startup> 
  </servlet> 
  <servlet-mapping> 
   <servlet-name>springMybatis</servlet-name> 
   <!-- 所有的的請求，都會被DispatcherServlet處理 --> 
   <url-pattern>/</url-pattern> 
  </servlet-mapping> 

<!--　該servlet為tomcat,jetty等容器提供,將靜態(tài)資源映射從/改為/static/目錄，如原來訪問　http://localhost/foo.css　,現(xiàn)在http://localhost/static/foo.css　--> 
<!-- 不攔截靜態(tài)文件 --> 
<servlet-mapping> 
  <servlet-name>default</servlet-name> 
  <url-pattern>/js/*</url-pattern> 
  <url-pattern>/css/*</url-pattern> 
  <url-pattern>/images/*</url-pattern> 
  <url-pattern>/fonts/*</url-pattern> 
</servlet-mapping> 

<mvc:default-servlet-handler default-servlet-name="所使用的Web服務器默認使用的Servlet名稱" /> 

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

  <!--配置攔截器, 多個攔截器,順序執(zhí)行 --> 
<mvc:interceptors>  
  <mvc:interceptor>  
    <!-- 匹配的是url路徑， 如果不配置或/**,將攔截所有的Controller --> 
    <mvc:mapping path="/" /> 
    <mvc:mapping path="/user/**" /> 
    <mvc:mapping path="/test/**" /> 
    <bean class="com.alibaba.interceptor.CommonInterceptor"></bean>  
  </mvc:interceptor> 
  <!-- 當設置多個攔截器時，先按順序調(diào)用preHandle方法，然后逆序調(diào)用每個攔截器的postHandle和afterCompletion方法 --> 
</mvc:interceptors> 

  /** 
 * 
 */ 
package com.alibaba.interceptor; 
 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import org.springframework.web.servlet.ModelAndView; 
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; 
 
import com.alibaba.util.RequestUtil; 
 
 
/** 
 * @author tfj 
 * 2014-8-1 
 */ 
public class CommonInterceptor extends HandlerInterceptorAdapter{ 
  private final Logger log = LoggerFactory.getLogger(CommonInterceptor.class); 
  public static final String LAST_PAGE = "com.alibaba.lastPage"; 
  /* 
   * 利用正則映射到需要攔截的路徑   
   
  private String mappingURL; 
   
  public void setMappingURL(String mappingURL) {   
        this.mappingURL = mappingURL;   
  }  
 */ 
  /** 
   * 在業(yè)務處理器處理請求之前被調(diào)用 
   * 如果返回false 
   *   從當前的攔截器往回執(zhí)行所有攔截器的afterCompletion(),再退出攔截器鏈 
   * 如果返回true 
   *  執(zhí)行下一個攔截器,直到所有的攔截器都執(zhí)行完畢 
   *  再執(zhí)行被攔截的Controller 
   *  然后進入攔截器鏈, 
   *  從最后一個攔截器往回執(zhí)行所有的postHandle() 
   *  接著再從最后一個攔截器往回執(zhí)行所有的afterCompletion() 
   */  
  @Override  
  public boolean preHandle(HttpServletRequest request,  
      HttpServletResponse response, Object handler) throws Exception {  
    if ("GET".equalsIgnoreCase(request.getMethod())) { 
      RequestUtil.saveRequest(); 
    } 
    log.info("==============執(zhí)行順序: 1、preHandle================");  
    String requestUri = request.getRequestURI(); 
    String contextPath = request.getContextPath(); 
    String url = requestUri.substring(contextPath.length()); 
    
    log.info("requestUri:"+requestUri);  
    log.info("contextPath:"+contextPath);  
    log.info("url:"+url);  
     
    String username = (String)request.getSession().getAttribute("user");  
    if(username == null){ 
      log.info("Interceptor：跳轉(zhuǎn)到login頁面！"); 
      request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response); 
      return false; 
    }else 
      return true;   
  }  
  
  /** 
   * 在業(yè)務處理器處理請求執(zhí)行完成后,生成視圖之前執(zhí)行的動作  
   * 可在modelAndView中加入數(shù)據(jù)，比如當前時間 
   */ 
  @Override  
  public void postHandle(HttpServletRequest request,  
      HttpServletResponse response, Object handler,  
      ModelAndView modelAndView) throws Exception {   
    log.info("==============執(zhí)行順序: 2、postHandle================");  
    if(modelAndView != null){ //加入當前時間  
      modelAndView.addObject("var", "測試postHandle");  
    }  
  }  
  
  /** 
   * 在DispatcherServlet完全處理完請求后被調(diào)用,可用于清理資源等  
   *  
   * 當有攔截器拋出異常時,會從當前攔截器往回執(zhí)行所有的攔截器的afterCompletion() 
   */  
  @Override  
  public void afterCompletion(HttpServletRequest request,  
      HttpServletResponse response, Object handler, Exception ex)  
      throws Exception {  
    log.info("==============執(zhí)行順序: 3、afterCompletion================");  
  }  
 
}