后端设置cookie的工具类 ：

前端获取后端的cookie值

通过EL表达式${cookie.key.value}

package com.gmsp.util.cookie;import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.net.URLEncoder;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** *  * Cookie 工具类 * */public final class CookieUtils {    /**     * 得到Cookie的值, 不编码     *      * @param request     * @param cookieName     * @return     */    public static String getCookieValue(HttpServletRequest request, String cookieName) {        return getCookieValue(request, cookieName, false);    }    /**     * 得到Cookie的值,     *      * @param request     * @param cookieName     * @return     */    public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {        Cookie[] cookieList = request.getCookies();        if (cookieList == null || cookieName == null) {            return null;        }        String retValue = null;        try {            for (int i = 0; i < cookieList.length; i++) {                if (cookieList[i].getName().equals(cookieName)) {                    if (isDecoder) {                        retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");                    } else {                        retValue = cookieList[i].getValue();                    }                    break;                }            }        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return retValue;    }    /**     * 得到Cookie的值 （自定义编码格式）,     *      * @param request     * @param cookieName     * @return     */    public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {        Cookie[] cookieList = request.getCookies();        if (cookieList == null || cookieName == null) {            return null;        }        String retValue = null;        try {            for (int i = 0; i < cookieList.length; i++) {                if (cookieList[i].getName().equals(cookieName)) {                    retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);                    break;                }            }        } catch (UnsupportedEncodingException e) {             e.printStackTrace();        }        return retValue;    }    /**     * 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码     */    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,            String cookieValue) {        setCookie(request, response, cookieName, cookieValue, -1);    }    /**     * 设置Cookie的值 在指定时间内生效,但不编码     */    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,            String cookieValue, int cookieMaxage) {        setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);    }    /**     * 设置Cookie的值 不设置生效时间,但编码     */    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,            String cookieValue, boolean isEncode) {        setCookie(request, response, cookieName, cookieValue, -1, isEncode);    }    /**     * 设置Cookie的值 在指定时间内生效, 编码参数     */    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,            String cookieValue, int cookieMaxage, boolean isEncode) {        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);    }    /**     * 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)     */    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,            String cookieValue, int cookieMaxage, String encodeString) {        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);    }    /**     * 删除Cookie带cookie域名     */    public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,            String cookieName) {        doSetCookie(request, response, cookieName, "", -1, false);    }    /**     * 设置Cookie的值，并使其在指定时间内生效     *      * @param cookieMaxage cookie生效的最大秒数     */    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,            String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {        try {            if (cookieValue == null) {                cookieValue = "";            } else if (isEncode) {                cookieValue = URLEncoder.encode(cookieValue, "utf-8");            }            Cookie cookie = new Cookie(cookieName, cookieValue);            if (cookieMaxage > 0)                cookie.setMaxAge(cookieMaxage);            if (null != request) {
   // 设置域名的cookie                String domainName = getDomainName(request);                System.out.println(domainName);                if (!"localhost".equals(domainName)&&"127.0.0.1".equals(domainName)) {                    cookie.setDomain(domainName);                }            }            cookie.setPath("/");            response.addCookie(cookie);        } catch (Exception e) {             e.printStackTrace();        }    }    /**     * 设置Cookie的值，并使其在指定时间内生效     *      * @param cookieMaxage cookie生效的最大秒数     */    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,            String cookieName, String cookieValue, int cookieMaxage, String encodeString) {        try {            if (cookieValue == null) {                cookieValue = "";            } else {                cookieValue = URLEncoder.encode(cookieValue, encodeString);            }            Cookie cookie = new Cookie(cookieName, cookieValue);            if (cookieMaxage > 0)                cookie.setMaxAge(cookieMaxage);            if (null != request) {
   // 设置域名的cookie                String domainName = getDomainName(request);                System.out.println(domainName);                if (!"localhost".equals(domainName)&&"127.0.0.1".equals(domainName)) {                    cookie.setDomain(domainName);                }            }            cookie.setPath("/");            response.addCookie(cookie);        } catch (Exception e) {             e.printStackTrace();        }    }    /**     * 得到cookie的域名     */    private static final String getDomainName(HttpServletRequest request) {        String domainName = null;        String serverName = request.getRequestURL().toString();        if (serverName == null || serverName.equals("")) {            domainName = "";        } else {            serverName = serverName.toLowerCase();            serverName = serverName.substring(7);            final int end = serverName.indexOf("/");            serverName = serverName.substring(0, end);            final String[] domains = serverName.split("\\.");            int len = domains.length;            if (len > 3) {                // www.xxx.com.cn                domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];            } else if (len <= 3 && len > 1) {                // xxx.com or xxx.cn                domainName = "." + domains[len - 2] + "." + domains[len - 1];            } else {                domainName = serverName;            }        }        if (domainName != null && domainName.indexOf(":") > 0) {            String[] ary = domainName.split("\\:");            domainName = ary[0];        }        return domainName;    }}

前端JS设置cookie：

设置和加入cookie的方法

cookie.set(key,value);

cookie.get(key);

var cookie = {    set:function(key,val,time){
    //设置cookie方法        var date=new Date(); //获取当前时间        var expiresDays=time;  //将date设置为n天以后的时间        date.setTime(date.getTime()+expiresDays*24*3600*1000); //格式化为cookie识别的时间        document.cookie=key + "=" +  escape(val) +";expires="+date.toGMTString();  //设置cookie    },    get:function(key){
    //获取cookie方法        /*获取cookie参数*/        var getCookie = document.cookie.replace(/[ ]/g,"");  //获取cookie，并且将获得的cookie格式化，去掉空格字符        var arrCookie = getCookie.split(";")  //将获得的cookie以"分号"为标识 将cookie保存到arrCookie的数组中        var tips;  //声明变量tips        for(var i=0;i