Cookie保存的工具类

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 * Cookie 工具类
 *
 */
public final class CookieUtils {

   protected static final Logger logger = LoggerFactory.getLogger(CookieUtils.class);

   /**
    * 得到Cookie的值, 不编码
    * 
    * @param request
    * @param cookieName
    * @return
    */
   public static String getCookieValue(HttpServletRequest request, String cookieName) {
      return getCookieValue(request, cookieName, false);
   }

   /**
    * 得到Cookie的值,
    * 
    * @param request
    * @param cookieName
    * @return
    */
   public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
      Cookie[] cookieList = request.getCookies();
      if (cookieList == null || cookieName == null){
         return null;         
      }
      String retValue = null;
      try {
         for (int i = 0; i < cookieList.length; i++) {
            if (cookieList[i].getName().equals(cookieName)) {
               if (isDecoder) {
                  retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
               } else {
                  retValue = cookieList[i].getValue();
               }
               break;
            }
         }
      } catch (UnsupportedEncodingException e) {
         logger.error("Cookie Decode Error.", e);
      }
      return retValue;
   }

   /**
    * 得到Cookie的值,
    * 
    * @param request
    * @param cookieName
    * @return
    */
   public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
      Cookie[] cookieList = request.getCookies();
      if (cookieList == null || cookieName == null){
         return null;         
      }
      String retValue = null;
      try {
         for (int i = 0; i < cookieList.length; i++) {
            if (cookieList[i].getName().equals(cookieName)) {
               retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
               break;
            }
         }
      } catch (UnsupportedEncodingException e) {
         logger.error("Cookie Decode Error.", e);
      }
      return retValue;
   }

   /**
    * 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码
    */
   public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue) {
      setCookie(request, response, cookieName, cookieValue, -1);
   }

   /**
    * 设置Cookie的值 在指定时间内生效,但不编码
    */
   public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage) {
      setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
   }

   /**
    * 设置Cookie的值 不设置生效时间,但编码
    */
   public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, boolean isEncode) {
      setCookie(request, response, cookieName, cookieValue, -1, isEncode);
   }

   /**
    * 设置Cookie的值 在指定时间内生效, 编码参数
    */
   public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
      doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
   }

   /**
    * 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)
    */
   public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
      doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
   }

   /**
    * 删除Cookie带cookie域名
    */
   public static void deleteCookie(HttpServletRequest request, HttpServletResponse response, String cookieName) {
      doSetCookie(request, response, cookieName, "", -1, false);
   }

   /**
    * 设置Cookie的值，并使其在指定时间内生效
    * 
    * @param cookieMaxage
    *            cookie生效的最大秒数
    */
   private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
      try {
         if (cookieValue == null) {
            cookieValue = "";
         } else if (isEncode) {
            cookieValue = URLEncoder.encode(cookieValue, "utf-8");
         }
         Cookie cookie = new Cookie(cookieName, cookieValue);
         if (cookieMaxage > 0)
            cookie.setMaxAge(cookieMaxage);
         if (null != request)// 设置域名的cookie
            cookie.setDomain(getDomainName(request));
         cookie.setPath("/");
         response.addCookie(cookie);
      } catch (Exception e) {
         logger.error("Cookie Encode Error.", e);
      }
   }

   /**
    * 设置Cookie的值，并使其在指定时间内生效
    * 
    * @param cookieMaxage
    *            cookie生效的最大秒数
    */
   private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
      try {
         if (cookieValue == null) {
            cookieValue = "";
         } else {
            cookieValue = URLEncoder.encode(cookieValue, encodeString);
         }
         Cookie cookie = new Cookie(cookieName, cookieValue);
         if (cookieMaxage > 0)
            cookie.setMaxAge(cookieMaxage);
         if (null != request)// 设置域名的cookie
            cookie.setDomain(getDomainName(request));
         cookie.setPath("/");
         response.addCookie(cookie);
      } catch (Exception e) {
         logger.error("Cookie Encode Error.", e);
      }
   }

   /**
    * 得到cookie的域名
    */
   private static final String getDomainName(HttpServletRequest request) {
      String domainName = null;

      String serverName = request.getRequestURL().toString();
      if (serverName == null || serverName.equals("")) {
         domainName = "";
      } else {
         serverName = serverName.toLowerCase();
         serverName = serverName.substring(7);
         final int end = serverName.indexOf("/");
         serverName = serverName.substring(0, end);
         final String[] domains = serverName.split("\\.");
         int len = domains.length;
         if (len > 3) {
            // www.xxx.com.cn
            domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
         } else if (len <= 3 && len > 1) {
            // xxx.com or xxx.cn
            domainName = "." + domains[len - 2] + "." + domains[len - 1];
         } else {
            domainName = serverName;
         }
      }

      if (domainName != null && domainName.indexOf(":") > 0) {
         String[] ary = domainName.split("\\:");
         domainName = ary[0];
      }
      return domainName;
   }

}