使用过滤器检查用户是否登录及指定过滤URL

public class LoginFilter implements Filter {
    
    private ICacheClient memcache;
    
    public void setMemcache(ICacheClient memcache) {
        this.memcache = memcache;
    }
    private FilterConfig filterConfig;
    @Override
    public void destroy() {
        this.filterConfig=null;
        
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException,
            ServletException {        
         //获取session
         HttpServletRequest request=(HttpServletRequest)req;
         HttpServletResponse response=(HttpServletResponse)resp;
         request.setCharacterEncoding("utf-8");
         response.setCharacterEncoding("utf-8");
         HttpSession session=request.getSession();
         
//         BeanDefinitionRegistry reg = new DefaultListableBeanFactory();   
//         PropertiesBeanDefinitionReader reader = new PropertiesBeanDefinitionReader(reg);   
//         reader.loadBeanDefinitions(new ClassPathResource("/PayWap/conf/paywap/properties/memcache.properties"));   
//         BeanFactory factory = (BeanFactory)reg;
//         String[] locations ={"conf/spring/applicationContext-Memcache.xml"};
//         ApplicationContext context = new ClassPathXmlApplicationContext("conf/spring/applicationContext-Memcache.xml");
//         ICacheClient memcache= (CacheClientImpl)context.getBean("memcache");
         
         
        /* Resource res = new ClassPathResource("conf/spring/applicationContext.xml");
         BeanFactory factory = new XmlBeanFactory(res);
         PropertyPlaceholderConfigurer cfg = (PropertyPlaceholderConfigurer)factory.getBean("PropertyConfigurer");
         cfg.postProcessBeanFactory((XmlBeanFactory) factory);
         ICacheClient memcachea= (CacheClientImpl) factory.getBean("memcache");*/
         
         //获取session中是否保存了用户信息
         Object obj=session.getAttribute(WebConstants.USER_INFO);
         //获取访问地址
         String uri=request.getRequestURI();
         String tid = request.getParameter("tid");
         if(uri==null)
             uri="";
         //uri=uri.toLowerCase();
         //判断sesion中的用户信息为空
         if(obj==null && checkUri(uri)){
               //如果cookie有值则取cookie值
                 TokenBean tokenBean = (TokenBean) memcache.get(tid);
                 if(tokenBean!=null){
                     //登录过，将用户信息保存到session中
                     AllUsers user=new AllUsers();
                     user.setUserid(tokenBean.getUserId());
                     user.setPhone(tokenBean.getPhone());
                     //user.setUserpwd(userInfo[2]);
                     session.setAttribute(WebConstants.USER_INFO, user);  
                 }
                 else{
                     //跳转到登录页面
                     response.sendRedirect(request.getContextPath()+"/v/login");
                     return;
                 }
         }
         //跳转到指定的url地址
         chain.doFilter(request, response);
        
    }
    
    @Override
    public void init(FilterConfig conf) throws ServletException {
        this.filterConfig=conf;
        
    }
    /**
     * 需要放行的uri包含的字符串数组                        
     */
    private String[] filterStr={"/v/login","/v/foreign","/v/recharge/mobilePurseChargeCallback","/v/recharge/bankChargeCallback","v/shortcutpay/callback"};
    /**
     * 
     * 说明：验证是否为不允许放行的uri
     * @param uriStr uri
     * @return 没有找到允许放行的返回true 否则返回false
     *
     */
    private boolean checkUri(String uriStr){        
        for(int i=0;i<filterStr.length;i++){
             if(uriStr.indexOf(filterStr[i])>=0)
                 return false;
        }
        return true;
    }