passedcheck.java

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package com.x3408.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 com.x3408.office.Constants;

public class PassedCheck implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest httpRequest=(HttpServletRequest) request;
		HttpServletResponse httpResponse=(HttpServletResponse) response;
		HttpSession session=httpRequest.getSession();
		String passed=(String) session.getAttribute("passed");
		if (passed==null){
			httpRequest.setAttribute("passed", "wrong");
			StringBuffer requestURL=httpRequest.getRequestURL();
			String query=httpRequest.getQueryString();
			requestURL.append(query==null?"":"?"+query);
			session.setAttribute("originalURL",requestURL.toString());
			httpRequest.getRequestDispatcher(Constants.S_LOGIN_JSP).forward(httpRequest,httpResponse);
		}else{
			chain.doFilter(httpRequest,httpResponse);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
	}

}