java读写Cookie

import java.io.UnsupportedEncodingException;

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

/**
* @author Administrator
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class Cookies {

    public int maxAge; // 设置该COOKIE的有效期,单位为秒
    public String path; // cookie路径
    Cookie[] cookie_get = {};

    public Cookies() {
        maxAge = -1;
        path = "/";
    }

    /**
    * Put cookie to the client
    *
    * @param response
    * @param name
    * @param value
    */
    public void putCookie(HttpServletResponse response, String name,
            String value) {
        try {
            Cookie cookie = new Cookie(name, encode(value));
            cookie.setMaxAge(maxAge);
            cookie.setPath(path);
            response.addCookie(cookie);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
    * get cookie from client
    *
    * @param request
    * @param name
    * @return
    */
    public String getCookie(HttpServletRequest request, String name) {
        if (cookie_get == null || cookie_get.length == 0) {
            cookie_get = request.getCookies();
        }
        String returnStr;
        returnStr = null;
        try {
            for (int i = 0; cookie_get != null && i < cookie_get.length; i++) {
                cookie_get[i].setPath(path);
                if (cookie_get[i].getName().equals(name)) {
                    cookie_get[i].setMaxAge(-1);
                    returnStr = cookie_get[i].getValue().toString();
                    break;
                }
            }
            return decode(returnStr);
        } catch (Exception e) {
            return decode(returnStr);
        }
    }

    /**
    * 清除Cookie
    *
    * @param response
    *            HttpServletResponse
    * @param name
    *            String
    */
    public void removeCookie(HttpServletResponse response, String name) {
        putCookie(response, name, null);
    }

    /**
    * 对给定字符进行 URL 解码
    *
    * @param value
    *            String
    * @return String
    */
    private static String decode(String value) {
        String result = "";
        if (!isEmpty(value)) {
            try {
                result = java.net.URLDecoder.decode(value, "GBK");
            } catch (UnsupportedEncodingException ex) {

            }
        }
        return result;
    }

    /**
    * 对给定字符进行 URL 编码
    *
    * @param value
    *            String
    * @return String
    */
    private static String encode(String value) {
        String result = "";
        if (!isEmpty(value)) {
            try {
                result = java.net.URLEncoder.encode(value, "GBK");
            } catch (UnsupportedEncodingException ex) {

            }
        }
        return result;
    }

    /**
    * 判断是否为空，为空返回true
    *
    * @param value
    *            String
    * @return boolean
    */
    private static boolean isEmpty(String value) {
        if (value == null || value.trim().equals(""))
            return true;
        else
            return false;
    }

    /**
    * 查检二个数据是否为空，如果为空返回true
    *
    * @param value1
    * @param value2
    * @return
    */
    public boolean isEmpty(String value1, String value2) {
        if (null == value1 || null == value2 || "".equals(value1)
                || "".equals(value2))
            return true;
        else
            return false;
    }
}