loginfilter.java

基于Java的地图数据管理软件。使用MySQL数据库管理系统。

/* 创建日期：Dec 19, 2006
 * 作　　者：朱　闰
 * 公　　司：安徽通途信息技术有限公司
 */

package com.tongtu.comm;

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 com.tongtu.util.UserInfo;

public class LoginFilter implements Filter{

	  protected FilterConfig filterConfig = null;
	    protected String home = null;

	    public void init(FilterConfig filterConfig) throws ServletException {
			// TODO Auto-generated method stub
	        this.filterConfig = filterConfig;
	        this.home = filterConfig.getInitParameter("home");
		}

		public void doFilter(ServletRequest request, ServletResponse response,
				FilterChain chain) throws IOException, ServletException {
			// TODO Auto-generated method stub
	        if (request instanceof HttpServletRequest) {
	            HttpServletRequest httpServletRequest = (HttpServletRequest)
	                request;
	            UserInfo userSession = (UserInfo) httpServletRequest.getSession().getAttribute("curuser");
	         
	            if (userSession == null) {//modified by craigchou 20051025
	                ( (HttpServletResponse) response).sendRedirect(
	                    httpServletRequest.getContextPath() + "/" + home);
	                return;
	            }
	        }
	        chain.doFilter(request, response);
		}

		public void destroy() {
			// TODO Auto-generated method stub
	        this.filterConfig = null;
	        this.home = null;
		}


}