loginfiler.java

oa rar it is the jsp

package com.accp.oa.control.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.HttpSession;

import java.util.*;

import com.accp.oa.dao.imple.*;
import com.accp.oa.factorydao.*;
import com.accp.oa.common.*;


/*
 * 此类用于处理
 * 用户请的登录页面
 * 当用户请求登录页面时
 * 将查找出系统的用户
 */
public class LoginFiler implements Filter{

	private FilterConfig config ;
	public void destroy() {
		
	}

	/*
	 * 此方法用于查找出用户
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		ArrayList list = new ArrayList();
		//通过工厂实例化PersonDAO的对象
		PersonDAO persondao = (PersonDAO)FactoryDAO.getnewInstance("PersonDAO");
//		调用Search方法获得存放用户信息的ArrayList对象
		list = persondao.search();
		//获得一个Session对象
		HttpSession session = ((HttpServletRequest)request).getSession();
		//把List对象存入Session中以用于登录
		session.setAttribute(Constants.USERNAMES, list);
		chain.doFilter(request, response);
	}

	public void init(FilterConfig config) throws ServletException {
			this.config = config;
	}

}