java CookieUtil

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.apache.log4j.Logger;

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

    protected static final Logger LOG = Logger.getLogger(CookieUtil.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)
        {
            LOG.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)
        {
            LOG.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)
        {
            LOG.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)
        {
            LOG.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;
    }

}

转载自：
CookieUtils —— Cookie 工具类
参考：
操作 Cookie 的Java工具类
操作 Cookie 的Java工具类