cookies的建立和清除

假设页面有个checkbox，name="remember",如果勾选了，就建立cookie，支持中文的话，还必须编码和解码操作

		// ** 建立cookies
		String rememberMe = request.getParameter("rememberMe");
		log.debug("logincheckServlet current position >> request.getParameter[remeberMe] = "+rememberMe);
		if("on".equals(rememberMe))
		{
			log.debug("logincheckServlet current position >> 建立cookies, start!");
			String urlEncodeUserName = null;
			try
			{
				// ** 吧中文名字编码
				urlEncodeUserName = URLEncoder.encode(userName,"utf-8"); 
				log.debug("logincheckServlet current position >> urlEncodeUserName = "+urlEncodeUserName);
			}
			catch (UnsupportedEncodingException e) 
        	{
    			log.error("LoginCheck cp >> URLDecoder.encode() error!");
        		e.printStackTrace();
    		}
			
			StringBuffer sb=new StringBuffer();
			sb.append("username=");
	        sb.append(urlEncodeUserName);
	        sb.append("&password=");
	        sb.append(password);
			Cookie cookie=new Cookie("userinfo",sb.toString());
			cookie.setMaxAge(1800);
	        cookie.setPath("/");
	        //cookie.setDomain(".gicp.net");
	        response.addCookie(cookie);
	        log.debug("logincheckServlet current position >> 建立cookies, end!");
		}

打算logout，清除一些相关记录

		HttpSession session = request.getSession();
		session.invalidate();
		log.debug("LogoutServlet current position >> session.invalidate() 完成!");
		
		// **
		Cookie[] cookies=request.getCookies();
		// ** 查找cookie
		if(cookies!=null)
		{
			for(int i=0;i<cookies.length;i++)
	        {
		
	            Cookie cookie=cookies[i];
	            String cName=cookie.getName();
	            log.debug("LogoutServlet current position >> cookie.getName() = "+cName);
	            if(cName.equals("userinfo") )
	            {
	            	//cookie.setValue(null);
	            	cookie.setPath("/");
	            	cookie.setMaxAge(0);
	            	//cookie.setMaxAge(-1);
	            	response.addCookie(cookie);
	            	log.debug("LogoutServlet current position >> 找到cName.equals【userinfo】并删除!");
	            }
	        }
		}
		log.debug("LogoutServlet current position >> 完成清除cookies的!");

评论

1 楼 jasstion 2009-06-02  

lz,我对Cookies不太清楚，Cookies不是存放在客户端的么？想javaeye是怎么实现读取客户端用户信息的？希望能够大致的介绍一下，谢谢！