islogintag.java

JSP开发的博客管理系统,使用struts+hibernate+AJAX技术

/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package dlog4j.security;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import dlog4j.formbean.UserForm;

/**
 * 判断用户是否登陆
 * <xxx:isLogin/>
 * @author Winter Lau
 */
public class IsLoginTag extends TagSupport {

	public int doStartTag() throws JspException {
		UserForm user = UserForm.getLoginUser((HttpServletRequest)pageContext.getRequest());
		return (user==null)?SKIP_BODY:EVAL_BODY_INCLUDE;		
	}
}