import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CookieUtils {

	public static final int COOKIE_MAX_AGE = 7 * 24 * 3600;

	public static final int COOKIE_HALF_HOUR = 30 * 60;

    /**

     * 根据Cookie名称得到Cookie对象，不存在该对象则返回Null

     *

     * @param request

     * @param name

     * @return

     */

    public static Cookie getCookie(HttpServletRequest request, String name) {

        Cookie[] cookies = request.getCookies();

        if (StrUtils.isEmptyArray(cookies)) {

            return null;

        }

        Cookie cookie = null;

        for (Cookie c : cookies) {

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

                cookie = c;

                break;

            }

        }

        return cookie;

    }

    /**

     * 根据Cookie名称直接得到Cookie值

     *

     * @param request

     * @param name

     * @return

     */

    public static String getCookieValue(HttpServletRequest request, String name) {

        Cookie cookie = getCookie(request, name);

        if(cookie != null){

        	return cookie.getValue();

        }

        return null;

    }

    /**

     * 移除cookie

     * @param request

     * @param response

     * @param name 这个是名称，不是值

     */

    public static void removeCookie(HttpServletRequest request,

            HttpServletResponse response, String name) {

        if (null == name) {

            return;

        }

        Cookie cookie = getCookie(request, name);

        if(null != cookie){

            cookie.setPath("/");

            cookie.setValue("");

            cookie.setMaxAge(0);

            response.addCookie(cookie);

        }

    }

    /**

     * 添加一条新的Cookie，可以指定过期时间(单位：秒)

     *

     * @param response

     * @param name

     * @param value

     * @param maxValue

     */

    public static void setCookie(HttpServletResponse response, String name,

            String value, int maxValue) {

        if (StrUtils.isBlank(name)) {

            return;

        }

        if (null == value) {

            value = "";

        }

        Cookie cookie = new Cookie(name, value);

        cookie.setPath("/");

        if (maxValue != 0) {

            cookie.setMaxAge(maxValue);

        } else {

            cookie.setMaxAge(COOKIE_HALF_HOUR);

        }

        response.addCookie(cookie);

        try {

			response.flushBuffer();

		} catch (IOException e) {

			e.printStackTrace();

		}

    } 

    /**

     * 添加一条新的Cookie，默认30分钟过期时间

     *

     * @param response

     * @param name

     * @param value

     */

    public static void setCookie(HttpServletResponse response, String name,

            String value) {

        setCookie(response, name, value, COOKIE_HALF_HOUR);

    }  

	/**

	 * 将cookie封装到Map里面

	 * @param request

	 * @return

	 */

	public static Map<String,Cookie> getCookieMap(HttpServletRequest request){

	    Map<String,Cookie> cookieMap = new HashMap<String,Cookie>();

	    Cookie[] cookies = request.getCookies();

	    if(!StrUtils.isEmptyArray(cookies)){

	        for(Cookie cookie : cookies){

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

	        }

	    }

	    return cookieMap;

	}

}