getfilter.java

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package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class GetFilter implements Filter{
	
	String LoginPage="/big-bird/index.jsp";
	protected FilterConfig config;
	
	public void init (FilterConfig config)throws ServletException{
		
		this.config=config;
	}
	
	public void setFilter(FilterConfig config){
		
		this.config=config;
	}
	
	public void doFilter(ServletRequest FRequest,ServletResponse FResponse,FilterChain Chain)
	throws ServletException,IOException{
		
		HttpServletRequest request=(HttpServletRequest)FRequest;
		HttpServletResponse response=(HttpServletResponse)FResponse;
		HttpSession session=request.getSession();
		
		String Login="";
		
		try{
			
			Login=(String)session.getAttribute("Login");
			
			if (Login!=null && !(Login.trim().equals(""))){
				
				Chain.doFilter(FRequest,FResponse);
			}
			
			else{
				
				response.sendRedirect(LoginPage);
			}
			
		}catch (Exception e){
			
			System.out.println(e.toString());
		}
	}
	
	public void destroy(){
		
		config=null;
	}
}