cookie使用举例（添加购物车商品_移除购物车商品）

1 if(cookieMap.containsKey(key)){
2 ...
3 } else {
4 //移除购物车商品失败
5 }

  1 import java.util.HashMap;
  2 import java.util.Map;
  3 import javax.servlet.http.Cookie;
  4 import javax.servlet.http.HttpServletRequest;
  5 import javax.servlet.http.HttpServletResponse;
  6 
  7 import net.sf.json.JSONObject;
  8 
  9 /**
 10  * 我的购物车
 11  * @author Administrator
 12  *
 13  */
 14 public class MyShoppingCar {
 15     
 16     /**
 17      * 添加商品
 18      * @param request
 19      * @param response
 20      * @param prodId   商品id
 21      * @param prodPrice 商品价格
 22      * @return
 23      * @throws Exception 
 24      */
 25     public static JSONObject addInShoppingCar(HttpServletRequest request,HttpServletResponse response,String opId,String prodId,String prodPrice) throws Exception{
 26         //保存在cookie
 27         String key = opId;
 28         String value = prodId + "*" + prodPrice;
 29         if("".equals(key)||"".equals(value)){
 30             throw new Exception("操作员信息不存在或者商品信息不存在，请联系管理员");
 31         }
 32         JSONObject jsonObject = new JSONObject(true);
 33         Map<String,Cookie> cookieMap = ReadCookieMap(request);//key--cookie
 34         
 35         if(cookieMap.containsKey(key)){
 36             Cookie cookie = cookieMap.get(key);
 37             String cookieVal = cookie.getValue();
 38             String[] vals = cookieVal.split(",");
 39             for (int i = 0; i < vals.length; i++) {
 40                 if(prodId.equals(vals[i].split("\\*")[0])){
 41                     jsonObject.put("status", "-1");
 42                     jsonObject.put("msg", "添加购物车失败");
 43                     return jsonObject;
 44                 } else {
 45                     if("".equals(cookieVal) || null == cookieVal){
 46                         cookieVal = value;
 47                     } else {
 48                         cookieVal += "," + cookieVal;
 49                     }
 50                     cookie.setValue(value);
 51                     cookie.setPath("/");
 52                     cookie.setMaxAge(24*60*60);
 53                     response.addCookie(cookie);
 54                 }
 55             }
 56         } else {
 57             Cookie newCookie = new Cookie(key,value);
 58             newCookie.setMaxAge(24*60*60);
 59             newCookie.setPath("/");
 60             response.addCookie(newCookie);
 61         }
 62         jsonObject.put("status", "1");
 63         jsonObject.put("msg", "添加购物车成功");
 64         return jsonObject;
 65     }
 66     
 67     /**
 68      * 返回cookieMap
 69      * @param request
 70      * @return
 71      */
 72     private static Map<String, Cookie> ReadCookieMap(HttpServletRequest request) {
 73         Cookie[] cookies = request.getCookies();
 74         Map<String,Cookie> cookieMap = null;
 75         if(null != cookies && cookies.length>0){
 76             cookieMap = new HashMap<String,Cookie>();
 77             for (int i = 0; i < cookies.length; i++) {
 78                 cookieMap.put(cookies[i].getName(), cookies[i]);
 79             }
 80         }
 81         return cookieMap;
 82     }
 83     
 84     /**
 85      * 移除购物车里面的商品
 86      * @param request
 87      * @param response
 88      * @param opId
 89      * @param prodId
 90      * @return
 91      */
 92     public static JSONObject delFromShoppingCar(HttpServletRequest request,HttpServletResponse response,String opId,String prodId){
 93         JSONObject jsonObject = new JSONObject();
 94         Map<String, Cookie> cookieMap = ReadCookieMap(request);
 95         if(cookieMap.containsKey(opId)){
 96             Cookie cookie = cookieMap.get(opId);//123*34,234*45,456*67
 97             String cookieVal = cookie.getValue();
 98             String[] cvalue = cookieVal.split(",");
 99             String newCval = "";
100             for (int i = 0; i < cvalue.length; i++) {
101                 if(!prodId.equals(cvalue[i].split("\\*")[0])){
102                     if("".equals(newCval) || null ==  newCval ){
103                         newCval = cvalue[i];
104                     } else {
105                         newCval += "," + cvalue[i];
106                     }
107                 } 
108             }
109             //删除cookie
110             cookie.setMaxAge(0);
111                         //重新创建cookie并保存购物车商品信息
112             Cookie newCookie = new Cookie(opId,newCval);
113             newCookie.setPath("/");
114             newCookie.setMaxAge(24*60*60);
115             response.addCookie(newCookie);
116             jsonObject.put("status", "1");
117             jsonObject.put("msg", "删除商品成功");
118             
119         } else {
120             jsonObject.put("status", "-1");
121             jsonObject.put("msg", "删除商品失败");
122         }
123         return jsonObject;
124     }
125 }