userloginfilter.java

HR系统模拟企业对内部职员的管理

/*$Id: UserLoginFilter.java,v 1.1 2008/07/15 03:38:23 liqi Exp $
 *--------------------------------------
 * Apusic (Kingdee Middleware)
 *---------------------------------------
 * Copyright By Apusic ,All right Reserved
 * author   date   comment
 * chenhongxin  2008-4-14  Created
*/
package org.operamasks.example.ejb.hr.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.operamasks.example.ejb.hr.constants.IPageConstants;
import org.operamasks.example.ejb.hr.constants.IUserConstants;

/**
 * 用户登陆检测过滤器，拦截/module/*的访问路径，
 * 检查访问用户是否登陆，未登陆则跳转到登陆页面。
 * @author chenhongxin
 */
public class UserLoginFilter implements Filter {

    public void destroy() {
        
    }

    public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
        HttpSession session = ((HttpServletRequest)request).getSession();
        String contextRoot = ((HttpServletRequest)request).getContextPath();
        if(session.getAttribute(IUserConstants.USER_BEAN) == null) {
            ((HttpServletResponse)response).sendRedirect(contextRoot + IPageConstants.LOGIN_PAGE_URL);
            return ;
        }
        chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig) throws ServletException {
        
    }

}