* 写cookie
*/
Cookie namecookie = new Cookie("name",name);
Cookie passwordcookie = new Cookie("password",password);
Cookie optioncookie = new Cookie("option","1");

//生命周期    
namecookie.setMaxAge(60*60*24*365);
passwordcookie.setMaxAge(60*60*24*365);
optioncookie.setMaxAge(60*60*24*365);
    
response.addCookie(namecookie);
response.addCookie(passwordcookie); 
response.addCookie(optioncookie); 

/*
 * 读cookie
*/
Cookie[] cookies = request.getCookies();
if(cookies!=null)
{
    String name = "";
    String password = "";
    String option = "";
    for (int i = 0; i < cookies.length; i++) 
    {
       Cookie 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();
        }     
    } 
  }

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function getcookie(name) {
var cookie_start = document.cookie.indexOf(name);
var cookie_end = document.cookie.indexOf(";", cookie_start);
return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));
}

function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
var expires = new Date();
expires.setTime(expires.getTime() + seconds);
document.cookie = escape(cookieName) + '=' + escape(cookieValue)
+ (expires ? '; expires=' + expires.toGMTString() : '')
+ (path ? '; path=' + path : '/')
+ (domain ? '; domain=' + domain : '')
+ (secure ? '; secure' : '');
}

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/// <summary>
    /// 写cookie
    /// </summary>
    /// <param name="name">必填,key</param>
    /// <param name="value">必填,value</param> 
    /// <param name="exptime">可选,exptime,数字</param> 
    SetCookies : function(name,value,exptime){
        try{
            if(arguments.length == 2) return arguments.callee(name,value,30*24*60*60*1000);
                           
            var exp　= new Date();
            exp.setTime(exp.getTime() + exptime);
            document.cookie = name + "="+ escape(value) +";expires="+ exp.toGMTString();
        }
        catch(e){
           throw new Error("SetCookies: " + e.message);
            return false;
        }
    }
    
    /// <summary>
    /// 读cookie
    /// </summary>
    /// <param name="name">必填,key</param>
    GetCookies : function(name){
        try{
            var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
            if(arr != null) 
               return unescape(arr[2]); 
            return null;
        }
        catch(e){
             throw new Error("GetCookies: " + e.message);
            return false;
        }
    }

//调用
document.getElementById('btn').attachEvent("onclick",function(){
    SetCookies ("key","value");
});

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