java對cookie的使用

轉載於http://www.cnblogs.com/muzongyan/archive/2010/08/30/1812552.html

/**
 * 設置cookie
 * @param response
 * @param name  cookie名字
 * @param value cookie值
 * @param maxAge cookie生命週期  以秒爲單位
 */
public static void addCookie(HttpServletResponse response,String name,String value,int maxAge){
    Cookie cookie = new Cookie(name,value);
    cookie.setPath("/");
    if(maxAge>0)  cookie.setMaxAge(maxAge);
    response.addCookie(cookie);
}

/**
 * 根據名字獲取cookie
 * @param request
 * @param name cookie名字
 * @return
 */
public static Cookie getCookieByName(HttpServletRequest request,String name){
    Map<String,Cookie> cookieMap = ReadCookieMap(request);
    if(cookieMap.containsKey(name)){
        Cookie cookie = (Cookie)cookieMap.get(name);
        return cookie;
    }else{
        return null;
    }   
}
 
 
 
/**
 * 將cookie封裝到Map裏面
 * @param request
 * @return
 */
private 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;
}