validateadminfilter.java

泽风留言本,非常小巧好用的东西啊.请多多照顾.

/**
 *  作者: 佟劲纬   创建日期: 2006-2-6
 *	
 *	QQ: 532443423 Email: [e-mail]
 */
package com.tjw.guestbook.filter;

import java.io.IOException;

import javax.servlet.*;
import javax.servlet.http.*;

import com.tjw.guestbook.framework.*;
import com.tjw.guestbook.framework.util.*;
import com.tjw.guestbook.form.*;
import com.tjw.guestbook.model.*;

/**
 * 
 */
public class ValidateAdminFilter implements Filter {

	public void init(FilterConfig filter) {

	}

	public void destroy() {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterChain) throws IOException, ServletException {

		HttpServletRequest hsr = (HttpServletRequest) request;
		HttpServletResponse hsrs = (HttpServletResponse) response;

		if (!isLogin(hsr)) {

			hsrs.sendRedirect(getURL(hsr));
			return;
		}
		filterChain.doFilter(request, response);
	}

	public String getURL(HttpServletRequest request) {

		String url = "/adminlogin.jsp";
		String contextUrl = request.getContextPath();
		String reurl = request.getRequestURI().substring(contextUrl.length());
		url = contextUrl + url + "?url=" + reurl;

		return url;
	}

	public boolean isLogin(HttpServletRequest request) {

		HttpSession session = request.getSession(false);
		if (session == null) {
			return false;
		} else {
			UserInfoBean userInfo = (UserInfoBean) session
					.getAttribute("userInfo");
			if (userInfo == null) {
				return false;
			} else {
				if (userInfo.getAdmin().equals("1")) {
					return true;
				} else {
					return false;
				}
			}
		}
	}
}