一、儲(chǔ)存Cookie:

1、從表單中獲取數(shù)據(jù)： request.getParameter("username")

2、創(chuàng)建Cookie對(duì)象： Cookie usernameCookie = new Cookie("username",username);

3.儲(chǔ)存Cookie對(duì)象： response.addCookie(usernameCookie);

<%    
    request.setCharacterEncoding("utf-8");  //設(shè)置編碼    
    //首先判斷用戶是否選擇了記住登錄狀態(tài)    
    String[] isUseCookie = request.getParameterValues("isUseCookie");    
    if (isUseCookie !=null && isUseCookie.length > 0){
        //把用戶名和密碼保存在Cookie對(duì)象里面
        String username = URLEncoder .encode(request.getParameter("username"),"utf-8"); 
       //使用URLEncoder 解決無法在Cookie當(dāng)中保存中文字符串問題
        String password = URLEncoder .encode(request.getParameter("password"),"utf-8");
        Cookie usernameCookie = new Cookie("username",username);
        Cookie passwordCookie = new Cookie("password",password); 
       usernameCookie.setMaxAge(864000); 
       passwordCookie.setMaxAge(864000);
        response.addCookie(usernameCookie); 
       response.addCookie(passwordCookie);
    }else {
        Cookie[] cookies = request.getCookies(); 
       if (cookies!=null && cookies.length>0){
            for (Cookie c:cookies){
                if (c.getName().equals("username") || c.getName().equals("password")){ 
                   c.setMaxAge(0);  //設(shè)置Cookie失效
                    response.addCookie(c); //重新保存 
               } 
           }
        }
    }
%>

二、 獲取Cookie 信息

1.獲取Cookie數(shù)據(jù): request.getCookies();

2.遍歷獲取到的Cookie數(shù)組,取到當(dāng)中的值: c.getValue()

<%
    request.setCharacterEncoding("utf-8"); 
   String username = "";
    String password = "";
    //獲取Cookie數(shù)據(jù)    Cookie[] cookies = request.getCookies();
    //判斷Cookie數(shù)據(jù)是否存在
    if (cookies!=null && cookies.length>0){
        for (Cookie c:cookies){
            //獲取用戶名
            if (c.getName().equals("username")){
                username = URLDecoder.decode(c.getValue(),"utf-8");
            }
            //獲取密碼
            if (c.getName().equals("password")){
                password = URLDecoder.decode(c.getValue(),"utf-8");
            }
        }
    }
%>