javax.servlet.http.Cookie nameCookie = new javax.servlet.http.Cookie("name", "darkmi");
javax.servlet.http.Cookie pwdCookie  = new javax.servlet.http.Cookie("password","darkmi123");
javax.servlet.http.Cookie optCookie  = new javax.servlet.http.Cookie("option","1982");

nameCookie.setMaxAge(60*60*24*365);
pwdCookie.setMaxAge(60*60*24*365);
optCookie.setMaxAge(60*60*24*365);
response.addCookie(nameCookie);
response.addCookie(pwdCookie); 
response.addCookie(optCookie);

javax.servlet.http.Cookie[] cookies = request.getCookies();
if (cookies != null) {
String name     = "";
String password = "";
String option   = "";
javax.servlet.http.Cookie c = null;
for (int i = 0; i < cookies.length; i++) {
c = cookies[i];
if (c.getName().equalsIgnoreCase("name")) {
name = c.getValue();
} else if (c.getName().equalsIgnoreCase("password")) {
password = c.getValue();
} else if (c.getName().equalsIgnoreCase("option")) {
option = c.getValue();
}
c = null;
}
System.out.println("name     - > " + name);
System.out.println("password - > " + password);
System.out.println("option   - > " + option);
}
 

javax.servlet.http.Cookie[] cookies = request.getCookies();
if (cookies != null) {
javax.servlet.http.Cookie c = null;
for (int i = 0; i < cookies.length; i++) {
c = cookies[i];
if (c.getName().equalsIgnoreCase("name")) {
c.setMaxAge(0);
response.addCookie(c);
} else if (c.getName().equalsIgnoreCase("password")) {
c.setMaxAge(0);
response.addCookie(c);
} else if (c.getName().equalsIgnoreCase("option")) {
c.setMaxAge(0);
response.addCookie(c);
}
c = null;
}
}
 

<script type="text/javascript">   
        function getCookie(name){               // 返回名為name的Cookie   
            var str = document.cookie;          // 獲取Cookie字串   
            if(!str || str.indexOf(name + "=") < 0) // 尋找name=   
                return;   
            var cookies = str.split("; ");      // 用;將所有的Cookie分隔開   
            for(var i=0; i<cookies.length; i++){    // 遍歷每個Cookie   
                var cookie = cookies[i];        // 當前Cookie   
                if(cookie.indexOf(name + "=") == 0){    // 如果名字為name   
                    var value = cookie.substring(name.length + 1);   
                                                // 獲取value   
                    return decodeURI(value);    // 將value解碼，並返回   
                }   
            }   
        }   
        function setCookie(name, value){        // 設定Cookie   
            document.cookie = name + "=" + encodeURI(value);   
                                                // 直接設定即可   
        }   
        </script>   


<!--
//學習一下如何利用js來操作cookie


//寫入 cookie
//不區分 cookieName 的大小寫
//不考慮子鍵
function WriteCookies(cookieName, cookieValue, expires)
{
    if (expires)
    {
        //指定了 expires
        document.cookie = 
            WriteCookies_GetCookieName(cookieName) + "=" + escape(cookieValue) 
            + "; expires=" + xpires.toGMTString();
    }
    else
    {
        document.cookie = WriteCookies_GetCookieName(cookieName) + "=" + escape(cookieValue);
    }
}


//獲取並返回與 cookieName 同名的 cookie 名稱，允許大小寫不同
//如果不存在這樣的 cookie，就返回 cookieName
function WriteCookies_GetCookieName(cookieName)
{
    var lowerCookieName = cookieName.toLowerCase();
    var cookieStr = document.cookie;
    
    if (cookieStr == "")
    {
        return cookieName;
    }
    
    var cookieArr = cookieStr.split("; ");
    var pos = -1;
    for (var i=0; i<cookieArr.length; i++)
    {
        pos = cookieArr[i].indexOf("=");
        if (pos > 0)
        {
            if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
            {
                return cookieArr[i].substring(0, pos);
            }
        }
    }
    
    return cookieName;
}


//獲取並返回 cookie 值
//不區分 cookieName 的大小寫
//dfltValue 為預設返回值
//不考慮子鍵
function ReadCookies(cookieName, dfltValue)
{
    var lowerCookieName = cookieName.toLowerCase();
    var cookieStr = document.cookie;
    
    if (cookieStr == "")
    {
        return dfltValue;
    }
    
    var cookieArr = cookieStr.split("; ");
    var pos = -1;
    for (var i=0; i<cookieArr.length; i++)
    {
        pos = cookieArr[i].indexOf("=");
        if (pos > 0)
        {
            if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
            {
                return unescape(cookieArr[i].substring(pos+1, cookieArr[i].length));
            }
        }
    }
    
    return dfltValue;
}






//test all the oper


document.write("寫入名稱為 cv 的 cookie...<br>");
WriteCookies("test", "test123", null);


document.write("寫入名稱為 Ab，帶失效日期的 cookie...<br>");
var expires = new Date("December 11, 2010");
WriteCookies("singleblue", "test234", expires);


document.write("讀取名稱為 singleblue 的 cookie..." + ReadCookies("ab", ""));
-->