loginfilter.java

一个完整的物流系统

package jp.com.cost.filter;

import java.io.IOException;

import java.io.IOException;
import java.io.PrintWriter;

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;

public class LoginFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse res = (HttpServletResponse)response;
		String url = req.getServletPath();
 		res.setCharacterEncoding("gb2312");
		HttpSession session = req.getSession();
		
		if((session.getAttribute("account")==null) && !url.equals("/DL7101.jsp")&&!url.equals("/DL7101.do")&&!url.equals("/logincheck.jsp") ){
			PrintWriter out= res.getWriter();
			out.print("<script>alert('请先登录！');window.opener =null;window.close();</script>");
			
		} 
		else{	
		    chain.doFilter(request, response);
		   
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
		
	}

}