https://www.cnblogs.com/xuexidememeda/p/10467469.html

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;
 
 
/**
 *
 * Cookie 工具类
 *
 */
public finalclass CookieUtil {
 
    /**
     * 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) {
            e.printStackTrace();
        }
        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) {
             e.printStackTrace();
        }
        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 finalvoid 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
                String domainName = getDomainName(request);
                System.out.println(domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        }catch (Exception e) {
             e.printStackTrace();
        }
    }
 
    /**
     * 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 finalvoid 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
                String domainName = getDomainName(request);
                System.out.println(domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        }catch (Exception e) {
             e.printStackTrace();
        }
    }
 
    /**
     * 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);
            finalint 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;
    }
 
}

分类: javaweb