操作 Cookie 的Java工具類

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

/**

@Package: com.xxxxx.common.util
@Title: Cookie.java Create on 2012-1-25 下午5:23:52 
@Description:

Cookie工具類,封裝Cookie常用操作

@author carrkevin
@version v 0.1
*/
public class CookieHelper {
/**

設置cookie有效期，根據需要自定義[本系統設置為30天]
/
private final static int COOKIE_MAX_AGE = 1000  60  60  24 * 30;
/*

@desc 刪除指定Cookie
@param response
@param cookie
*/
public static void removeCookie(HttpServletResponse response, Cookie cookie)
{

 if (cookie != null)
 {
         cookie.setPath("/");
         cookie.setValue("");
         cookie.setMaxAge(0);
         response.addCookie(cookie);
 }

}
/*

@desc 刪除指定Cookie
@param response
@param cookie
@param domain
*/
public static void removeCookie(HttpServletResponse response, Cookie cookie,String domain)
{

 if (cookie != null)
 {
         cookie.setPath("/");
         cookie.setValue("");
         cookie.setMaxAge(0);
         cookie.setDomain(domain);
         response.addCookie(cookie);
 }

}
/*

@desc 根據Cookie名稱得到Cookie的值，沒有返回Null
@param request
@param name
@return
*/
public static String getCookieValue(HttpServletRequest request, String name)
{

 Cookie cookie = getCookie(request, name);
 if (cookie != null)
 {
         return cookie.getValue();
 }
 else
 {
         return null;
 }

}
/*

@desc 根據Cookie名稱得到Cookie對象，不存在該對象則返回Null
@param request
@param name
*/
public static Cookie getCookie(HttpServletRequest request, String name)
{

 Cookie cookies[] = request.getCookies();
 if (cookies == null || name == null || name.length() == 0)
         return null;
 Cookie cookie = null;
 for (int i = 0; i < cookies.length; i++)
 {
         if (!cookies[i].getName().equals(name))
                 continue;
         cookie = cookies[i];
         if (request.getServerName().equals(cookie.getDomain()))
                 break;
 }

 return cookie;

}
/*

@desc 添加一條新的Cookie信息，默認有效時間為一個月
@param response
@param name
@param value
*/
public static void setCookie(HttpServletResponse response, String name, String value)
{

 setCookie(response, name, value, COOKIE_MAX_AGE);

}
/*

@desc 添加一條新的Cookie信息，可以設置其最長有效時間(單位：秒)
@param response
@param name
@param value
@param maxAge
*/
public static void setCookie(HttpServletResponse response, String name, String value, int maxAge)
{
 if (value == null)
         value = "";
 Cookie cookie = new Cookie(name, value);
 if(maxAge!=0){
     cookie.setMaxAge(maxAge);
 }else{
     cookie.setMaxAge(COOKIE_MAX_AGE);
 }
 cookie.setPath("/");
 response.addCookie(cookie);

}
}</pre>