Cookie工具类

/**
 * Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
 */
package com.thinkgem.jeesite.common.utils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.ui.Model;

/**
 * Cookie工具类
 * @author ThinkGem
 * @version 2013-01-15
 */
public class CookieUtils {

    /**
     * 设置 Cookie（生成时间为1天）
     * @param name 名称
     * @param value 值
     */
    public static void setCookie(HttpServletResponse response, String name, String value) {
        setCookie(response, name, value, 60*60*24);
    }
    
    /**
     * 设置 Cookie
     * @param name 名称
     * @param value 值
     * @param maxAge 生存时间（单位秒）
     * @param uri 路径
     */
    public static void setCookie(HttpServletResponse response, String name, String value, String path) {
        setCookie(response, name, value, path, 60*60*24);
    }
    
    /**
     * 设置 Cookie
     * @param name 名称
     * @param value 值
     * @param maxAge 生存时间（单位秒）
     * @param uri 路径
     */
    public static void setCookie(HttpServletResponse response, String name, String value, int maxAge) {
        setCookie(response, name, value, "/", maxAge);
    }
    
    /**
     * 设置 Cookie
     * @param name 名称
     * @param value 值
     * @param maxAge 生存时间（单位秒）
     * @param uri 路径
     */
    public static void setCookie(HttpServletResponse response, String name, String value, String path, int maxAge) {
        Cookie cookie = new Cookie(name, null);
        cookie.setPath(path);
        cookie.setMaxAge(maxAge);
        try {
            cookie.setValue(URLEncoder.encode(value, "utf-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        response.addCookie(cookie);
    }
    
    /**
     * 获得指定Cookie的值
     * @param name 名称
     * @return 值
     */
    public static String getCookie(HttpServletRequest request, String name) {
        return getCookie(request, null, name, false);
    }
    /**
     * 获得指定Cookie的值，并删除。
     * @param name 名称
     * @return 值
     */
    public static String getCookie(HttpServletRequest request, HttpServletResponse response, String name) {
        return getCookie(request, response, name, true);
    }
    /**
     * 获得指定Cookie的值
     * @param request 请求对象
     * @param response 响应对象
     * @param name 名字
     * @param isRemove 是否移除
     * @return 值
     */
    public static String getCookie(HttpServletRequest request, HttpServletResponse response, String name, boolean isRemove) {
        String value = null;
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals(name)) {
                    try {
                        value = URLDecoder.decode(cookie.getValue(), "utf-8");
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                    if (isRemove) {
                        cookie.setMaxAge(0);
                        response.addCookie(cookie);
                    }
                }
            }
        }
        return value;
    }
    
    /**
     * 生成cookie的值  浏览过商品id的拼接 
     * @return 生成cookie的id拼接值
     */
    public static String createValue(HttpServletRequest request,String id) {
        
        String exhiHist = CookieUtils.getCookie(request, "exhiHist");
        
        // null或没有exhiHist
        if( StringUtils.isBlank(exhiHist)){
            //直接返回传入的id
            return id;
        }
        // 3,2,1          2
        //String -> String[] ->  Collection :为了方便判断重复id
        String[] ids = exhiHist.split(",");
        Collection colls = Arrays.asList(ids); //<3,21>
        // LinkedList 方便地操作（增删改元素）集合
        // Collection -> LinkedList
        LinkedList list = new LinkedList(colls);
        //不超过4个
        if(list.size()<6){
            //id重复
            if(list.contains(id)){
                //去除重复id，把传入的id放最前面
                list.remove(id);
                list.addFirst(id);
            }else{
                //直接把传入的id放最前面
                list.addFirst(id);
            }
        }else{
            //等于4个
            //id重复
            if(list.contains(id)){
                //去除重复id，把传入的id放最前面
                list.remove(id);
                list.addFirst(id);
            }else{
                //去最后的id，把传入的id放最前面
                list.removeLast();
                list.addFirst(id);
            }
        }
        
        // LinedList -> String 
        StringBuffer sb = new StringBuffer();
        for (Object object : list) {
            sb.append(object+",");
        }
        //去掉最后的逗号
        String result = sb.toString();
        result = result.substring(0, result.length()-1);
        return result;
    }
    
    /**
     * 获取我的足迹的方法
     * @param model
     * @param request
     */
    public static void getMyWatch(Model model, HttpServletRequest request,HttpServletResponse response) {
        try {
            String exhiIds = CookieUtils.getCookie(request, "exhiHist");
            if(StringUtils.isNotBlank(exhiIds)){
                String[] obj = exhiIds.split(",");
                List<Map<String, String>> list = new ArrayList<Map<String,String>>();
                for (String product : obj) {
                    String[] elem = product.split(":");
                    if(elem.length>0){
                        Map<String, String> p = new HashMap<String,String>();
                        p.put("total", elem[0]);
                        p.put("zhanWeiArea", elem[1]);
                        p.put("tiMu", elem[2]);
                        p.put("url", elem[3]);
                        list.add(p);
                    }
                }
                model.addAttribute("hist", list);
            }
        } catch (Exception e) {
            CookieUtils.setCookie(response, "exhiHist", "");
        }
    }
    /**
     * 获取Cookie 值
     * @param request
     * @return
     */
    public static Map<String,Cookie> ReadCookieMap(HttpServletRequest request){  
        Map<String,Cookie> cookieMap = new HashMap<String,Cookie>();
        Cookie[] cookies = request.getCookies();
        if(null!=cookies){
            for(Cookie cookie : cookies){
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }
    /**
     * 
     * @param request
     * @param response
     * @param name
     * @return
     */
    public static boolean clearCookie(HttpServletRequest request,HttpServletResponse response, String name){
        boolean bool = false;
        Cookie[] cookies = request.getCookies();
        try {
            for(int i =0;i<cookies.length;i++){
                Cookie cookie = new Cookie(name, null);
                cookie.setMaxAge(0);
                cookie.setPath("/");
                response.addCookie(cookie);
                bool=true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bool;
    }

}