java web 操作Cookie

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

public class CookieUtil {

public static Cookie getCookie(HttpServletRequest request, String name) {
Cookie cookies[] = request.getCookies();
if (cookies == null || name == null || name.length() == 0) {
return null;
}
for (int i = 0; i < cookies.length; i++) {
if (name.equals(cookies[i].getName())
&& request.getServerName().equals(cookies[i].getDomain())) {
return cookies[i];
}
}
return null;
}

public static void deleteCookie(HttpServletRequest request,
HttpServletResponse response, Cookie cookie) {
if (cookie != null) {
cookie.setPath(getPath(request));
cookie.setValue("");
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}

public static void setCookie(HttpServletRequest request,
HttpServletResponse response, String name, String value) {
setCookie(request, response, name, value, 0x278d00);
}

public static void setCookie(HttpServletRequest request,
HttpServletResponse response, String name, String value, int maxAge) {
Cookie cookie = new Cookie(name, value == null ? "" : value);
cookie.setMaxAge(maxAge);
cookie.setPath(getPath(request));
response.addCookie(cookie);
}

private static String getPath(HttpServletRequest request) {
String path = request.getContextPath();
return (path == null || path.length()==0) ? "/" : path;
}

}