site.java

用java写的ftp服务器程序

// $Id: SITE.java 306757 2005-10-06 11:33:33 +0530 (Thu, 06 Oct 2005) rana_b $
/*
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ftpserver.command;

import java.io.IOException;
import java.util.HashMap;

import org.apache.commons.logging.Log;
import org.apache.ftpserver.Command;
import org.apache.ftpserver.FtpRequestImpl;
import org.apache.ftpserver.FtpWriter;
import org.apache.ftpserver.RequestHandler;
import org.apache.ftpserver.ftplet.FtpException;
import org.apache.ftpserver.ftplet.Ftplet;
import org.apache.ftpserver.ftplet.FtpletEnum;
import org.apache.ftpserver.interfaces.IFtpConfig;


/**
 * Handle SITE command.
 * 
 * @author <a href="mailto:[e-mail]">Rana Bhattacharyya</a>
 */
public 
class SITE implements Command {

    private static final HashMap COMMAND_MAP = new HashMap(16);
    
    
    /**
     * Execute command.
     */
    public void execute(RequestHandler handler,
                        FtpRequestImpl request, 
                        FtpWriter out) throws IOException, FtpException {
        
        // call Ftplet.onSite method
        IFtpConfig fconfig = handler.getConfig();
        Ftplet ftpletContainer = fconfig.getFtpletContainer();
        FtpletEnum ftpletRet = ftpletContainer.onSite(request, out);
        if(ftpletRet == FtpletEnum.RET_SKIP) {
            return;
        }
        else if(ftpletRet == FtpletEnum.RET_DISCONNECT) {
            fconfig.getConnectionManager().closeConnection(handler);
            return;
        }
        
        // get request name
        String argument = request.getArgument();
        if(argument != null) {
            int spaceIndex = argument.indexOf(' ');
            if(spaceIndex != -1) {
                argument = argument.substring(0, spaceIndex);
            }
            argument = argument.toUpperCase();
        }
        
        // no params
        if(argument == null) {
            request.resetState();
            out.send(200, "SITE", null);
            return;
        }
        
        // call appropriate command method
        String siteRequest = "SITE_" + argument; 
        Command command = (Command)COMMAND_MAP.get( siteRequest );
        try {
            if(command != null) {
                command.execute(handler, request, out);
            }
            else {
                request.resetState();
                out.send(502, "SITE.not.implemented", argument);
            }
        }
        catch(Exception ex) {
            Log log = fconfig.getLogFactory().getInstance(getClass());
            log.warn("SITE.execute()", ex);
            request.resetState();
            out.send(500, "SITE", null);
        }
    
    }
    
    // initialize all the SITE command handlers
    static {
        COMMAND_MAP.put("SITE_DESCUSER", new org.apache.ftpserver.command.SITE_DESCUSER());
        COMMAND_MAP.put("SITE_HELP",     new org.apache.ftpserver.command.SITE_HELP());
        COMMAND_MAP.put("SITE_STAT",     new org.apache.ftpserver.command.SITE_STAT());
        COMMAND_MAP.put("SITE_WHO",      new org.apache.ftpserver.command.SITE_WHO());
        COMMAND_MAP.put("SITE_ZONE",     new org.apache.ftpserver.command.SITE_ZONE());
    }
}