import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class LoginCheck extends HttpServlet { public void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println( "LoginCheck" ); if( request.getParameter("submit") == null ) { displayForm( out ); } else if( request.getParameter("user").equals("cysun") && request.getParameter("pass").equals("abcd") ) out.println( "you're logged in." ); else { displayForm( out ); } out.println( "" ); } private void displayForm( PrintWriter out ) { out.println( "
"); out.println( "username:
"); out.println( "password:
"); out.println( "
"); out.println( "
"); } public void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { doGet(request,response); } }