java 设置Cookie值

原文地址：http://blog.csdn.net/lansetiankong12/article/details/52622654

/**

* 读取所有cookie

* 注意二、从客户端读取Cookie时，包括maxAge在内的其他属性都是不可读的，也不会被提交。浏览器提交Cookie时只会提交name与value属性。maxAge属性只被浏览器用来判断Cookie是否过期

* @param request

* @param response

*/

　　　　　@RequestMapping("/showCookies")  

        publicvoid showCookies(HttpServletRequest request,HttpServletResponse response ){  

            Cookie[] cookies = request.getCookies();//这样便可以获取一个cookie数组  

            if(null==cookies) {  

                System.out.println("没有cookie=========");  

            }else{  

                for(Cookie cookie : cookies){  

                    System.out.println("name:"+cookie.getName()+",value:"+ cookie.getValue());  

                }  

            }  

        }  

/**

* 添加cookie

* @param response

* @param name

* @param value

*/

　　　　 @RequestMapping("/addCookie")  

        publicvoid addCookie(HttpServletResponse response,String name,String value){  

            Cookie cookie = newCookie(name.trim(), value.trim());  

            cookie.setMaxAge(30* 60);// 设置为30min  

            cookie.setPath("/");  

            System.out.println("已添加===============");  

            response.addCookie(cookie);  

        }  

/**

* 修改cookie

* @param request

* @param response

* @param name

* @param value

* 注意一、修改、删除Cookie时，新建的Cookie除value、maxAge之外的所有属性，例如name、path、domain等，都要与原Cookie完全一样。否则，浏览器将视为两个不同的Cookie不予覆盖，导致修改、删除失败。

*/

  @RequestMapping("/editCookie")  

        publicvoid editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){  

            Cookie[] cookies = request.getCookies();  

            if(null==cookies) {  

                System.out.println("没有cookie==============");  

            }else{  

                for(Cookie cookie : cookies){  

                    if(cookie.getName().equals(name)){  

                        System.out.println("原值为:"+cookie.getValue());  

                        cookie.setValue(value);  

                        cookie.setPath("/");  

                        cookie.setMaxAge(30* 60);// 设置为30min  

                        System.out.println("被修改的cookie名字为:"+cookie.getName()+",新值为:"+cookie.getValue());  

                        response.addCookie(cookie);  

                        break;  

                    }  

                }  

            }  

        }  

/**

* 删除cookie

* @param request

* @param response

* @param name

*/

 @RequestMapping("/delCookie")  

        publicvoid delCookie(HttpServletRequest request,HttpServletResponse response,String name){  

            Cookie[] cookies = request.getCookies();  

            if(null==cookies) {  

                System.out.println("没有cookie==============");  

            }else{  

                for(Cookie cookie : cookies){  

                    if(cookie.getName().equals(name)){  

                        cookie.setValue(null);  

                        cookie.setMaxAge(0);// 立即销毁cookie  

                        cookie.setPath("/");  

                        System.out.println("被删除的cookie名字为:"+cookie.getName());  

                        response.addCookie(cookie);  

                        break;  

                    }  

                }  

            }  

        }  

/**

* 根据名字获取cookie

* @param request

* @param name cookie名字

* @return

*/

  public Cookie getCookieByName(HttpServletRequest request,String name){  

        Map<String,Cookie> cookieMap = ReadCookieMap(request);  

        if(cookieMap.containsKey(name)){  

            Cookie cookie = (Cookie)cookieMap.get(name);  

            returncookie;  

        }else{  

            returnnull;  

        }    

    }  

通常开发时先用以下的代码将获取的cookie进行封装

/**

* 将cookie封装到Map里面

* @param request

* @return

*/

 private Map<String,Cookie> ReadCookieMap(HttpServletRequest request){    

        Map<String,Cookie> cookieMap = newHashMap<String,Cookie>();  

        Cookie[] cookies = request.getCookies();  

        if(null!=cookies){  

            for(Cookie cookie : cookies){  

                cookieMap.put(cookie.getName(), cookie);  

            }  

        }  

        returncookieMap;  

    }