opts_mlst.java

用java写的ftp服务器程序

// $Id: OPTS_MLST.java 306732 2005-09-22 11:04:48 +0530 (Thu, 22 Sep 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.StringTokenizer;

import org.apache.ftpserver.Command;
import org.apache.ftpserver.DirectoryLister;
import org.apache.ftpserver.FtpRequestImpl;
import org.apache.ftpserver.FtpWriter;
import org.apache.ftpserver.RequestHandler;
import org.apache.ftpserver.ftplet.FtpException;

/**
 * Client-Server listing negotation.
 * Instruct the server what listing types to include in
 * machine directory/file listings.
 * 
 * @author Birkir A. Barkarson
 */
public 
class OPTS_MLST implements Command {
    
    /**
     * Execute command.
     */
    public void execute(RequestHandler handler,
                        FtpRequestImpl request, 
                        FtpWriter out) throws IOException, FtpException {
        
        // reset state
        request.resetState();
        
        // get the listing types
        String argument = request.getArgument();
        int spIndex = argument.indexOf(' ');
        if(spIndex == -1) {
            out.send(503, "OPTS.MLST", null);
            return;
        }
        String listTypes = argument.substring(spIndex + 1);
        
        // parse all the type tokens
        StringTokenizer st = new StringTokenizer(listTypes, ";");
        String types[] = new String[st.countTokens()];
        for(int i=0; i<types.length; ++i) {
            types[i] = st.nextToken();
        }
        
        // set the list types
        DirectoryLister dirLister = handler.getDirectoryLister();
        if(dirLister.setSelectedTypes(types)) {
            out.send(200, "OPTS.MLST", listTypes);
        }
        else {
            out.send(501, "OPTS.MLST", listTypes);
        }
    }
}