Java cookie utility functions

java_cookie_ex

/**
 * 
 */
package com.newcoresys.utils;

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

/**
 * Cookie工具类
 * 
 * @author joeymac
 *
 */
public class CookieEx {

	public static final String COOKIE_KEY_SESSIONID = "gttsid";

	/**
	 * 从request cookie中取出sessionid
	 * 
	 * @param request
	 * @return
	 */
	public static String getSessionidFromCookie(HttpServletRequest request) {
		return getCookie(request, COOKIE_KEY_SESSIONID);
	}

	/**
	 * 获取cookie
	 * 
	 * @param requst
	 * @param name
	 * @return
	 */
	public static Cookie getCookieObject(HttpServletRequest request, String name) {
		Cookie[] cookies = request.getCookies();
		if (cookies != null)
			for (Cookie cookie : cookies)
				if (cookie.getName().equals(name))
					return cookie;
		return null;
	}

	/**
	 * 获取cookie中的值，如果不存在返回默认值
	 * 
	 * @param requst
	 * @param name
	 * @param defaultValue
	 * @return
	 */
	public static String getCookie(HttpServletRequest requst, String name,
			String defaultValue) {
		Cookie cookie = getCookieObject(requst, name);
		return cookie != null ? cookie.getValue() : defaultValue;
	}

	/**
	 * 获取cookie中的值，如果不存在则返回null
	 * 
	 * @param requst
	 * @param name
	 * @return
	 */
	public static String getCookie(HttpServletRequest requst, String name) {
		return getCookie(requst, name, null);
	}

	/**
	 * 设置cookie
	 * 
	 * @param response
	 * @param name
	 * @param value
	 * @return
	 */
	public static HttpServletResponse setCookie(HttpServletRequest request,
			HttpServletResponse response, String name, String value) {
		Cookie cookie = getCookieObject(request, name);
		if (cookie == null) {
			cookie = new Cookie(name, value);
		} else {
			cookie.setValue(value);
		}
		cookie.setPath("/");
		cookie.setHttpOnly(true);
		response.addCookie(cookie);
		return response;
	}

	/**
	 * 设置cookie，默认使用{@link #COOKIE_KEY_SESSIONID}
	 * 
	 * @param response
	 * @param name
	 * @param value
	 * @return
	 */
	public static HttpServletResponse setCookie(HttpServletRequest request,
			HttpServletResponse response, String value) {
		return setCookie(request, response, COOKIE_KEY_SESSIONID, value);
	}

	/**
	 * 删除gtt的cookie
	 * @param request
	 * @param response
	 * @return
	 */
	public static HttpServletResponse removeCookie(HttpServletRequest request,
			HttpServletResponse response) {
		return removeCookie(request, response, COOKIE_KEY_SESSIONID);
	}
	
	/**
	 * 删除cookie
	 * @param request
	 * @param response
	 * @param name
	 * @return
	 */
	public static HttpServletResponse removeCookie(HttpServletRequest request,
			HttpServletResponse response, String name) {
		Cookie cookie = getCookieObject(request, name);
		if (cookie != null) {
			cookie.setMaxAge(0);
			response.addCookie(cookie);
		}
		return response;
	}

}