<!-- 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，  并在那里定义相关的Beans，重写在全局中定义的任何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>  <!-- 所有的的请求，都会被DispatcherServlet处理 -->  <url-pattern>/</url-pattern>  </servlet-mapping>

<!--　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　-->
<!-- 不拦截静态文件 -->
<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服务器默认使用的Servlet名称" />

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

<!--配置拦截器, 多个拦截器,顺序执行 -->
<mvc:interceptors>    <mvc:interceptor>    <!-- 匹配的是url路径， 如果不配置或/**,将拦截所有的Controller -->  <mvc:mapping path="/" />  <mvc:mapping path="/user/**" />  <mvc:mapping path="/test/**" />  <bean class="com.alibaba.interceptor.CommonInterceptor"></bean>    </mvc:interceptor>  <!-- 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 -->
</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";  /* * 利用正则映射到需要拦截的路径     private String mappingURL; public void setMappingURL(String mappingURL) {     this.mappingURL = mappingURL;     }    */  /**  * 在业务处理器处理请求之前被调用  * 如果返回false  *     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 * 如果返回true  *    执行下一个拦截器,直到所有的拦截器都执行完毕  *    再执行被拦截的Controller  *    然后进入拦截器链,  *    从最后一个拦截器往回执行所有的postHandle()  *    接着再从最后一个拦截器往回执行所有的afterCompletion()  */    @Override    public boolean preHandle(HttpServletRequest request,    HttpServletResponse response, Object handler) throws Exception {    if ("GET".equalsIgnoreCase(request.getMethod())) {  RequestUtil.saveRequest();  }  log.info("==============执行顺序: 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：跳转到login页面！");  request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);  return false;  }else  return true;     }    /** * 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    * 可在modelAndView中加入数据，比如当前时间 */  @Override    public void postHandle(HttpServletRequest request,    HttpServletResponse response, Object handler,    ModelAndView modelAndView) throws Exception {     log.info("==============执行顺序: 2、postHandle================");    if(modelAndView != null){  //加入当前时间    modelAndView.addObject("var", "测试postHandle");    }    }    /**  * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等   *   * 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()  */    @Override    public void afterCompletion(HttpServletRequest request,    HttpServletResponse response, Object handler, Exception ex)    throws Exception {    log.info("==============执行顺序: 3、afterCompletion================");    }    }