第一部分 拦截器实现:
 

package com.infowarelab.cem.easytouch.web.interceptor;

import java.lang.reflect.Method;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.beans.factory.InitializingBean;

import com.infowarelab.cem.easytouch.service.cache.JbossCache;
import com.infowarelab.common.log.Log;
import com.infowarelab.common.log.LogFactory;

public class FlushGroupCacheInterceptor implements MethodInterceptor,

InitializingBean {

 protected Log log = LogFactory.getLog(FlushGroupCacheInterceptor.class);

 private static final long serialVersionUID = 2366041803410037545L;

 private JbossCache cache;

 private Integer siteId;

 public void setCache(JbossCache cache) {

  this.cache = cache;
 }

 public Object invoke(MethodInvocation invocation) throws Throwable {

  Object result = invocation.proceed();

  flushGroupCache(invocation);

  return result;

 }

 private void flushGroupCache(MethodInvocation invocation)
   throws NoSuchMethodException {

  // extends ActionSupport
  // HttpSession session = ServletActionContext.getRequest().getSession();
  // String
  // siteId=(String)session.getAttribute(CEMConstants.SESSION_KEY_SITE_ID);

  siteId = Context.getCurrentSiteId();

  if (siteId == null) {
   return;
  }

  String methodName = invocation.getMethod().getName();

  log.info("--------------------");
  log.info("methodName:" + methodName);
  log.info("--------------------");

  Class[] paramsType = invocation.getMethod().getParameterTypes();

  Class methodNameClass = invocation.getThis().getClass();

  Method m = methodNameClass.getMethod(methodName, paramsType);

  boolean flag = m.isAnnotationPresent(OsCacheFlushGroupName.class);
  if (flag) {
   OsCacheFlushGroupName groupName = m
     .getAnnotation(OsCacheFlushGroupName.class);
   log.info("--------------------");
   log.info("groupName:" + "" + siteId + groupName.value());
   log.info("--------------------");
   cache.flushGroup("" + siteId + groupName.value());
  }
 }

 public void afterPropertiesSet() throws Exception {

  // TODO Auto-generated method stub

 }
}

第2部分:web层数据传递

package com.infowarelab.cem.easytouch.web.interceptor;

public class Context {

  private static ThreadLocal<Integer> currentSiteId = new ThreadLocal<Integer>(); 
   
      private Context(){} 
   
      //这个方法由Filter在请求达到时根据会话(e.g HttpSession，但不限于HttpSession)情况调用设置 
      public static void setCurrentSiteId(Integer siteId) { 
       currentSiteId.set(siteId); 
      } 
   
      //这个方法，可被同一JVM中的任何其他方法调用。 
      //返回当前请求者的Id，没有登录，则返回null 
      public static Integer getCurrentSiteId() { 
          return currentSiteId.get(); 
      } 
   
}

第3部分:web层数据传递通过filter,或web层Interceptor实现

package com.infowarelab.cem.easytouch.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import com.infowarelab.cem.common.util.CEMConstants;
import com.infowarelab.cem.easytouch.web.interceptor.Context;

public class SiteIdFilter implements Filter {

 public void destroy() {
  // TODO Auto-generated method stub

 }

 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain filterChain) throws IOException, ServletException {
  // TODO Auto-generated method stub

  setSiteIdToContext(request);
  
  filterChain.doFilter(request, response);
 }

 private void setSiteIdToContext(ServletRequest request) {
  String siteId = "";
  HttpServletRequest req = (HttpServletRequest) request;

 
  HttpSession session = req.getSession();
  if (session.getAttribute(CEMConstants.SESSION_KEY_SITE_ID) != null) {
   siteId = (String) session
     .getAttribute(CEMConstants.SESSION_KEY_SITE_ID);
   Context.setCurrentSiteId(new Integer(siteId));
   return;
  }
  
  siteId = req.getParameter("siteId");
  if (siteId != null && siteId.trim().length() > 0) {
   Context.setCurrentSiteId(new Integer(siteId));
   return;
  }

 }

 public void init(FilterConfig config) throws ServletException {
  // TODO Auto-generated method stub

 }

}

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