package com.how2java.tmall.interceptor;

import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;
import org.apache.struts2.StrutsStatics;
import org.springframework.beans.factory.annotation.Autowired;

import com.how2java.tmall.pojo.Category;
import com.how2java.tmall.service.CategoryService;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class CategoryNamesBelowSearchInterceptor  extends AbstractInterceptor{  

	@Autowired
	CategoryService categoryService;			
	
    @Override  
    public String intercept(ActionInvocation invocation) throws Exception {
          
        ActionContext ctx = invocation.getInvocationContext();
        HttpServletRequest request= (HttpServletRequest) ctx.get(StrutsStatics.HTTP_REQUEST);
        ServletContext servletContext= (ServletContext) ctx.get(StrutsStatics.SERVLET_CONTEXT);
        
        String contextPath = servletContext.getContextPath();
        String uri = request.getRequestURI();
        uri =StringUtils.remove(uri, contextPath);
        if(uri.startsWith("/fore")){
        		List<Category> cs = categoryService.list();
        		ctx.getSession().put("cs", cs);
        }
        return invocation.invoke();
   
    }  
  
}  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
  <constant name="struts.i18n.encoding" value="UTF-8"></constant>
  <constant name="struts.objectFactory" value="spring"/>
  <package name="basicstruts" extends="struts-default">
       <interceptors>    
            <interceptor name="authorityInterceptor" class="com.how2java.tmall.interceptor.AuthInterceptor"></interceptor>
            <interceptor name="categoryNamesBelowSearchInterceptor" class="com.how2java.tmall.interceptor.CategoryNamesBelowSearchInterceptor"></interceptor>    
            <!-- 拦截器栈 -->    
            <interceptor-stack name="auth-default">    
                <interceptor-ref name="authorityInterceptor" />    
                <interceptor-ref name="categoryNamesBelowSearchInterceptor" />
                <interceptor-ref name="defaultStack" />    
            </interceptor-stack>    
        </interceptors>   
        <default-interceptor-ref name="auth-default"></default-interceptor-ref>  
 </package>
 </struts>