JAVA操作COOKIE 收藏1.设置CookieCookie cookie = new Cookie("key", "value");cookie.setMaxAge(60);设置60秒生存期，如果设置为负值的话，则为浏览器进程Cookie(内存中保存)，关闭浏览器就失效。

cookie.setPath("/test/test2");设置Cookie路径，不设置的话为当前路径(对于Servlet来说为request.getContextPath() + web.xml里配置的该Servlet的url-pattern路径部分)response.addCookie(cookie);2.读取Cookie该方法可以读取当前路径以及“直接父路径”的所有Cookie对象，如果没有任何Cookie 的话，则返回nullCookie[] cookies = request.getCookies();3.删除CookieCookie cookie = new Cookie("key", null);cookie.setMaxAge(0);设置为0为立即删除该Cookiecookie.setPath("/test/test2");删除指定路径上的Cookie，不设置该路径，默认为删除当前路径Cookieresponse.addCookie(cookie);4.修改CookieCookie[] cookies=request.getCookies();if(cookies.length>1){for(int i=0;i<cookies.length;i++){if(cookies[i].getName().equals("key")) {String oldValue = cookies[i].getValue();String newValue= "newValue";cookies[i].setValue(newValue);response.addCookie(cookies[i]);break;}}}===============================================================1.实现两个网站和共用Cookies2.添加CookiesCookie cookie = new Cookie("name", "wangwz");cookie.setPath("/");//这个要设置cookie.setDomain("");//这个也要设置才能实现上面的两个网站共用cookie.setMaxAge(365*24*60*60);//不设置的话，则cookies不写入硬盘,而是写在内存,只在当前页面有用,以秒为单位response.addCookie(cookie);cookie = new Cookie("nick", URLEncoder.encode("王伟宗","UTF-8"));cookie.setPath("/");cookie.setDomain("");cookie.setMaxAge(365*24*60*60);response.addCookie(cookie);3.获取cookiesCookie cookies[] = request.getCookies();if (cookies != null){for (int i = 0; i < cookies.length; i++){if (cookies[i].getName().equals("nick")){System.out.println(URLDecoder.decode(cookies[i].getValue(),"UTF-8"));}}}4.删除cookiesCookie cookies[] = request.getCookies();if (cookies != null){for (int i = 0; i < cookies.length; i++){if (cookies[i].getName().equals("nick")){Cookie cookie = new Cookie("nick","");//这边得用"",不能用nullcookie.setPath("/");//设置成跟写入cookies一样的cookie.setDomain("");//设置成跟写入cookies一样的response.addCookie(cookie);}}}================================================================================================================应用实例<%@ page contentType="text/html; charset=gb2312" language="java" import="java.util.*" errorPage="" %><%@ page import=".URLDecoder" %> //注意导入此包<%Cookie cookie=new Cookie("hi","welcome");response.addCookie(cookie);Cookie[] cookies=request.getCookies();if(cookies!=null){for(int i=0;i<cookies.length;i++){if(cookies[i].getName().equals("hi")){String cookieValue=URLDecoder.decode(cookies[i].getValue(),"utf-8");out.print("hi="+cookieValue);}}}else{out.print(" no cookie");}%>Javascript操纵Cookie实现购物车程序2008-04-29 22:04Name 购物车Version 1.1Author Vanni(凡林) url: QQ:303590170 CreateDate 2005-05-31Description此类是基于JavaScript和客户端Cookie，请保证客户端开启Cookie数据保持（默认24*30小时）可以通过 this.expire=? 小时来指定类中两自带的两个对象 typeObj 和 proObj 均有两个相同属性名： name 和value类中数据存储形式如下-----------------------------------Array(new typeObj('汽车',array(new porObj('三菱',200),new proObj('本田',500))),new typeObj('蛋',array(new proObj('鸡蛋',10),new proObj('鸭蛋',20))}Cookie 存取形式为[使用escape()函数加密过]--------------购物车名 = 汽车#三菱:200|本田:500,蛋#鸡蛋:10|鸭蛋:20注意：客户端存Cookie时，不会出现问题。

如果要循环存储的话，可能会出现有些存入，而有些未存入解决方法：见下例(获得URL里的sales的数量，并存入Cookie)文件：/depot/compareproduct.php 中的JS代码片段<script language="javascript">var car=new Car('compare');var typeName='list';car.delType(typeName); //将先前对比的产品清除//得到URL里的参数，并分隔成数组var url=location.href;var start=stIndexOf('?sales=');var end=url.indexOf('&');if(end==-1)end=url.length;var urlparam=url.substring(stIndexOf('?sales=')+7,end ).split(',');function setPageVal(){if(car.getPro(typeName).length==urlparam.length)return; //关键部分，如果数组长度不相等说明，有些Cookie没有存入else{car.addType(typeName); //增一个类别for(i=0;i<urlparam.length;i++){car.addPro(typeName,urlparam[i],''); //增加对比产品，如果存在，返回假}setTimeout('setPageVal();',100); //再次调用自身，没有用递归，是因为递归速度太快，仍会有存不进的问题}}setPageVal(); //初始化数据function delItem(itemname){car.delPro(typeName,itemname);var carData=car.getPro(typeName);var url='';var carlen=carData.length;if(carlen>1){for(i=0;i<carData.length;i++){if(i==0) url =carData[i].name;else url+=','+carData[i].name;}document.write("waiting....");location.href='../depot/compareproduct.php?sales='+url;}else{if(confirm('如果删除它，那么只剩一个对比项了，是否关闭此窗口？')){ car.delCar();window.close();}}}</script>********************************************************************* ********************************//**Cookie类*/function Cookie(){/**@desc 设置Cookie@return void*/this.setCookie=function(name, value, hours){var expire = "";if(hours != null){expire = new Date((new Date()).getTime() + hours * 3600000); expire = "; expires=" + expire.toGMTString();}document.cookie = escape(name) + "=" + escape(value) + expire; }/**@desc 读取Cookie@return String*/this.getCookie=function(name){var cookieValue = "";var search = escape(name) + "=";if(document.cookie.length > 0){offset = document.cookie.indexOf(search);if (offset != -1){offset += search.length;end = document.cookie.indexOf(";", offset);if (end == -1) end = document.cookie.length;cookieValue = unescape(document.cookie.substring(offset, end)) }}return cookieValue;}}function Car(name){if( !window.clientInformation.cookieEnabled ) {alert('你的浏览器不支持Cookie无法使用此购物车系统');return false;}//##内部变量#############################################################this.carName = name;this.expire = 24*30; //购物车的有效时间(30天) this.carDatas = new Array();this.cookie = new Cookie();//##内部对象#############################################################this.typeObj=function(name,value){ //自带的类别对象 =name;this.value="/value;}this.proObj=function(name,value){ //自带的" 商品对象 =name;this.value=value;}//##私有方法列表##########################################################//// getTypePoint(typeName); //得到购物车里类别数组里的下标// getProPoint(typeName,proName); //得到购物车里类别下的产品下标// saveCookie() //以特定的形式存储此购物车的Cookie////################################################################### #####/**@desc 得到购物车里类别数组里的下标，找到的话返回下标，否则返回 -1 @return int*/this.getTypePoint=function(typeName){var isok=false;var i=0;for(;i<this.carDatas.length;i++){if(this.carDatas[i].name==typeName){isok=true; //找到位置break;}}if(isok) return i;else return -1;}/**@desc 得到购物车里类别下的产品下标，找到返回下标，否则返回 -1@return int*/this.getProPoint=function(typeId,proName){var isok=false;var j = 0;var tempProObj=this.carDatas[typeId].value;for(;j<tempProObj.length;j++){if(tempProObj[j].name==proName){isok=true;break;}}if(isok) return j;else return -1;}/**@desc 存储生成的Cookie字符串@return void*/this.saveCookie=function(){var outStr='';for( i=0; i<this.carDatas.length; i++ ){var typeName =this.carDatas[i].name;var typeValue=this.carDatas[i].value;var proOutStr='';for( j=0; j<typeValue.length; j++ ){if ( j==0 ) proOutStr = typeValue[j].name + ':' + typeValue[j].value; else proOutStr += '|' + typeValue[j].name + ':' +typeValue[j].value;}if ( i==0 ) outStr = typeName + '#' + proOutStr;else outStr += ',' + typeName + '#' + proOutStr;}this.cookie.setCookie(this.carName,outStr,this.expire); //存入Cookie}//##构造语句############################################################if(this.cookie.getCookie(name)==''){this.cookie.setCookie(name,'',this.expire);}else{var tempTypes=this.cookie.getCookie(name).split(',');for(i=0;i<tempTypes.length;i++){var tempTypeObj=tempTypes[i].split('#');var type_pro=new Array();if(tempTypeObj[1]){var tempProObj=tempTypeObj[1].split('|');for(j=0;j<tempProObj.length;j++){var proDesc=tempProObj[j].split(':');type_pro.push(new this.proObj(proDesc[0],proDesc[1]));}}this.carDatas.push(new this.typeObj(tempTypeObj[0],type_pro));}}//##公共方法列表#########################################################//// addType(typeName); //增加一个类别// addPro(typeName,proName,value); //增加一个产品// editPro(typeName,proName,value); //修改产品的值// delPro(typeName,proName); //删除购物车内的一个类别下的产品// delType(typeName); //删除购物车内的一个类别，包括类别下的产品// delCar(); //删除购物车//// getCar(); //得到整个购物车的数据// getType(); //得到购物车内的所有类别列表// getPro(typeName); //得到购物车内指定类别下的产品列表// getProVal(typeName,proName); //得到购物车内指定类别下的产品属性////################################################################### #####/**@desc 在购物车里增加一个类别，增加成功返回真，否则返回假@return bool*/this.addType=function(typeName){if(this.getTypePoint(typeName)!=-1) return false;//如果已经有此类别了，返回假this.carDatas.push(new this.typeObj(typeName,new Array()));//push进自身数组this.saveCookie(); //存入 Cookiereturn true;}/**@desc 在购物车里增加一个产品，增加成功返回真，否则返回假@return bool*/this.addPro=function(typeName,proName,value){var typePoint=this.getTypePoint(typeName); if ( typePoint ==-1 ) return false; //没有此类别，无法增加，返回假var proPoint =this.getProPoint(typePoint,proName); if ( proPoint != -1 ) return false; //有此产品了，无法增加重复，返回假this.carDatas[typePoint].value.push(new this.proObj(proName,value)); //push到自身数组this.saveCookie(); //存入 Cookiereturn true;}/**@desc 修改购物车里的产品属性@return bool*/this.editPro=function(typeName,proName,value){var typePoint=this.getTypePoint(typeName); if ( typePoint == -1 ) return false; //没有此类别，无法修改，返回假var proPoint =this.getProPoint(typePoint,proName); if ( proPoint == -1 ) return false; //没有此产品，无法修改，返回假this.carDatas[typePoint].value[proPoint].value=value;//更新自身this.saveCookie(); //存入 Cookiereturn true;}/**@desc 删除一个产品@return bool*/this.delPro=function(typeName,proName){var typePoint=this.getTypePoint(typeName); if ( typePoint == -1 ) return false; //没有此类别，无法删除，返回假var proPoint =this.getProPoint(typePoint,proName); if ( proPoint == -1 ) return false; //没有此产品，无法删除，返回假var pros=this.carDatas[typePoint].value.length;this.carDatas[typePoint].value[proPoint] =this.carDatas[typePoint].value[pros-1]; //最后一个产品放置要删除的产品上this.carDatas[typePoint].value.pop();this.saveCookie(); //存入 Cookiereturn true;}/**@desc 删除一个类别@return bool*/this.delType=function(typeName){var typePoint=this.getTypePoint(typeName); if ( typePoint == -1 ) return false; //没有此类别，无法删除，返回假var types=this.carDatas.length;this.carDatas[typePoint] = this.carDatas[types-1];//删除类别this.carDatas.pop();this.saveCookie(); //存入 Cookiereturn true;}/**@desc 删除此购物车@return void*/this.delCar=function(){this.cookie.setCookie(this.carName,'',0);this.carDatas=new Array();this.saveCookie(); //存入 Cookie}/**@desc 获得购物车数据@return Array*/this.getCar=function(){return this.carDatas;}/**@desc 获得类别列表@return Array*/this.getType=function(){var returnarr=new Array();for ( i=0; i<this.carDatas.length; i++)returnarr.push(this.carDatas[i].name);return returnarr;}/**@desc 获得类别下的产品列表@return Array*/this.getPro=function(typeName){var typePoint=this.getTypePoint(typeName); if ( typePoint == -1 ) return false; //没有此类别，返回假return this.carDatas[typePoint].value;}/**@desc 获得商品属性@return String*/this.getProVal=function(typeName,proName){var typePoint=this.getTypePoint(typeName); if ( typePoint == -1 ) return false; //没有此类别，返回假var proPoint =this.getProPoint(typePoint,proName); if ( proPoint == -1 ) return false; //没有此产品，返回假return this.carDatas[typePoint].value[proPoint].value;}}。