managementservlet.java

主要是对串口驱动的的一些控制源码！！！ 在下载javacomm20-win32.zip后就可以使用。

/**
 * $Log: ManagementServlet.java,v $
 * Revision 1.3  2003/02/01 13:23:35  mwulff
 * no message
 *
 * Revision 1.2  2003/01/17 16:01:17  mwulff
 * added support for remote message handling
 *
 * Revision 1.1  2003/01/16 13:08:09  mwulff
 * initial version
 *
 * Revision 1.2  2003/01/13 19:13:27  mwulff
 * no message
 *
 * Revision 1.1  2002/12/23 13:03:20  mwulff
 * no message
 *
 * Revision 1.3  2002/12/20 18:51:18  mwulff
 * no message
 *
 * Revision 1.2  2002/12/14 22:43:08  mwulff
 * no message
 *
 * Revision 1.1  2002/12/13 20:07:33  mwulff
 * no message
 *
 */
package de.fhm.jkf.resource.sv;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;


/**
 * @author	marten wulff
 * 
 * * <br><br><center><table border="1" width="80%"><hr>
 * <strong><a href="http://jkf.sourceforge.net">The JKF Project</a></strong>
 * <p>
 * Copyright (C) 2002 by Marten Wulff
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the <a href="http://www.gnu.org/copyleft/lesser.html">
 * GNU Lesser General Public License</a> along with this library; if not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA  02111-1307  USA
 * <hr></table></center>
 */
public class ManagementServlet extends HttpServlet implements ConsoleConstants {

	// Logging
	private static Logger logger = Logger.getLogger(ManagementServlet.class);
	
	private ServerLoggingManager logManager =
		ServerLoggingManager.instance();
	private RemoteManager remoteManager = 
		RemoteManager.instance();	
	private ServerResourceManager resManager = 
		ServerResourceManager.instance();	

	private ServletContext context = null;
	private TransferBean bean = null;
	
	/*
	 * @see Servlet#init(ServletConfig)
	 */
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		context = config.getServletContext();
	}

	/*
	 * @see HttpServlet#service(HttpServletRequest, HttpServletResponse)
	 */
	public void service(
		HttpServletRequest request,
		HttpServletResponse response)
		throws ServletException, IOException {

		response.setContentType("text/html");
		
		HttpSession session = request.getSession(false);
		
		// if it's the first call, init the TransferBean, that is used 
		// by the views
		if(session == null) {
			session = request.getSession(true);
			bean = new TransferBean();
			bean.setServerLogLevel(logManager.getServerLogLevel().toString());
			bean.setClientLogLevel(remoteManager.getClientLogLevel().toString());
			session.setAttribute("bean", bean);
		}		
		
		RequestDispatcher dispatcher = context.getRequestDispatcher("/jsp/JKFManagement.jsp");
		
		String action = request.getParameter(MAIN_SWITCH);
		
		if (action == null || action.equals("")) {
			request.setAttribute(VIEW, LOGIN_VIEW);			
			
		} else if (action.equals(PERFORM_LOGIN_ACTION)) {
			if(performLoginAction(request, response, session)) {
				request.setAttribute(VIEW, MAIN_CONSOLE_VIEW);
			}else {
				request.setAttribute(VIEW, LOGIN_VIEW);
			}
		} else if(!isLoggedIn(session)) { // from here user needs to be logged in
			request.setAttribute(VIEW, LOGIN_VIEW);
		} else if (action.equals(CHANGE_LOCAL_LOGLEVEL_ACTION)) {
			performLocalLogLevelAction(request, response);
			request.setAttribute(VIEW, MAIN_CONSOLE_VIEW);
			
		} else if (action.equals(CHANGE_REMOTE_LOGLEVEL_ACTION)) {
			performRemoteLogLevelAction(request, response);
			request.setAttribute(VIEW, MAIN_CONSOLE_VIEW);
			
		} else if (action.equals(REMOTE_MESSAGE_ACTION)) {
			performRemoteMessageAction(request, response);
			request.setAttribute(VIEW, MAIN_CONSOLE_VIEW);
		}
		
		dispatcher.forward(request, response);
	}

	private void performRemoteMessageAction(
		HttpServletRequest request,
		HttpServletResponse response) {
	
		String message = request.getParameter(REMOTE_MESSAGE);
		remoteManager.setClientResponseMessage(message);		
	}
	
	
	/**
	 * This method is only for controlling if the user has performed
	 * a Login. This is now real user authentication.
	 */
	private boolean isLoggedIn(HttpSession session) {
		String user = (String)session.getAttribute("UserName");
		if(user != null) {
			return true;
		} else {
			return false;
		}		
	}
	
	private boolean performLoginAction(
		HttpServletRequest request,
		HttpServletResponse response,
		HttpSession session) {

		String pUser = request.getParameter(USER);
		String pPw = request.getParameter(PASSWD);

		if (pUser == null || pPw == null) {
			return false;
		}

		// check login, if wrong display the login screen again
		if (!resManager.checkLogin(pUser, pPw)) {
			return false;
		}

		session.setAttribute("UserName", pUser);
		
		return true;
	}


	private void performLocalLogLevelAction(
		HttpServletRequest request,
		HttpServletResponse response) {
		Level newLevel = Level.toLevel(request.getParameter(LOCAL_LOG_LEVEL));

		logManager.setServerLogLevel(newLevel);
		bean.setServerLogLevel(logManager.getServerLogLevel().toString());
	}

	private void performRemoteLogLevelAction(
		HttpServletRequest request,
		HttpServletResponse response) {
		Level newLevel = Level.toLevel(request.getParameter(REMOTE_LOG_LEVEL));

		remoteManager.setClientLogLevel(newLevel);
		bean.setClientLogLevel(remoteManager.getClientLogLevel().toString());
	}

}