mangerfileter.java

一个真实的网络选课系统,由实际需求得到的,本人实际开发出来,运用JSP+TOMCAT

package 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;

public class MangerFileter implements Filter{
	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest req = (HttpServletRequest) request;
	    HttpServletResponse res = (HttpServletResponse) response;
	    HttpSession session = req.getSession();
	    if (session.getAttribute("mangerId") != null) {
	        chain.doFilter(request, response);
	    } else {
	        res.sendRedirect("../manger.jsp");
	    }

	}

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

	}
}