loginservlet.java

dns系统

package com.livechance;

import java.io.IOException;
import java.io.PrintWriter; //import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet {

	private static final long serialVersionUID = 3886168342818354208L;

	@Override
	protected void service(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setContentType("text/html;charset=GB2312");
		PrintWriter pw = response.getWriter();

		HttpSession session = request.getSession();
		session.setMaxInactiveInterval(120);
		String sessionName = (String) session.getAttribute("name");
		String sessionPassword = (String) session.getAttribute("password");
		if (sessionName != null && sessionPassword != null) {
			request.getRequestDispatcher("CourseServlet").forward(request,
					response);
			// RequestDispatcher rd =
			// request.getRequestDispatcher("CourseServlet");
			// rd.forward(request, response);
			return;
		}

		String paraName = request.getParameter("name");
		String paraPasssword = request.getParameter("password");
		if (paraName == null || paraPasssword == null
				|| paraName.trim().equals("")
				|| paraPasssword.trim().equals("")) {
			pw.println("Error!");
			request.getRequestDispatcher("/login.html").include(request,
					response);
		} else {
			session.setAttribute("name", paraName);
			session.setAttribute("password", paraPasssword);
			request.getRequestDispatcher("CourseServlet").forward(request,
					response);
		}

	}

}