基于commons-net实现ftp创建文件夹、上传、下载功能

原文：http://www.open-open.com/code/view/1420774470187

package com.demo.ftp;  

    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.io.PrintWriter;
    import java.net.ConnectException;  

    import org.apache.commons.net.PrintCommandListener;
    import org.apache.commons.net.ftp.FTP;
    import org.apache.commons.net.ftp.FTPClient;
    import org.apache.commons.net.ftp.FTPReply;  

    /**
     * @author wobendiankun 2015-1-8 下午08:11:08
     */
    public class FtpClientUtil {
        /**
         * ftp服务器地址
         */
        private  String server;
        /**
         * 端口
         */
        private  int port;
        /**
         * 用户名
         */
        private  String username;
        /**
         *
         */
        private  String password;  

        public FtpClientUtil () {
            server = "localhost";
            port = 21;
            username = "kun";
            password = "111111";
        }  

        public FtpClientUtil(String server, int port, String username,
                String password) {
            this.server = server;
            this.port = port;
            this.username = username;
            this.password = password;
        }
        /**上传文件
         * @param remoteFileName 远程文件名称
         * @param locaFileName 本地文件名称
         */
        public void upload(String remoteFileName,String locaFileName){
            FTPClient ftp=null;
            try {
                ftp = new FTPClient();
                ftp.addProtocolCommandListener( new PrintCommandListener( new PrintWriter( System.out ), true ) );
                //连接ftp服务器
                connect( ftp );
                //设置属性
                setProperty( ftp );
                //上传文件
                upload( ftp, remoteFileName, locaFileName );
                //退出
                logout( ftp );
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                if (ftp.isConnected()) {
                    try {
                        ftp.disconnect();
                    } catch (IOException f) {
                    }
                }
            }  

        }
        /**上传文件
         * @param remoteFileName 远程文件名称
         * @param locaFileName 本地文件名称
         */
        public void download(String remoteFileName,String locaFileName){
            FTPClient ftp=null;
            try {
                ftp = new FTPClient();
                ftp.addProtocolCommandListener( new PrintCommandListener( new PrintWriter( System.out ), true ) );
                //连接ftp服务器
                connect( ftp );
                //设置属性
                setProperty( ftp );
                //下载文件
                download( ftp, remoteFileName, locaFileName );
                //退出
                logout( ftp );
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                if (ftp.isConnected()) {
                    try {
                        ftp.disconnect();
                    } catch (IOException f) {
                    }
                }
            }
        }
        /**创建文件夹
         * @param remotePathName 远程文件夹名称
         */
        public void mkdir(String remotePathName) {
            FTPClient ftp=null;
            try {
                ftp = new FTPClient();
                ftp.addProtocolCommandListener( new PrintCommandListener( new PrintWriter( System.out ), true ) );
                //连接ftp服务器
                connect( ftp );
                //设置属性
                setProperty( ftp );
                //创建文件夹
                mkdir( ftp, remotePathName);
                //退出
                logout( ftp );
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                if (ftp.isConnected()) {
                    try {
                        ftp.disconnect();
                    } catch (IOException f) {
                    }
                }
            }
        }
        /**
         * @param ftp
         * @param remotePathName
         */
        private void mkdir(FTPClient ftp, String remotePathName) throws Exception{
            ftp.makeDirectory(remotePathName);
        }  

        /**
         * @param ftp
         * @param remoteFileName
         * @param locaFileName
         */
        private void download(FTPClient ftp, String remoteFileName,
                String locaFileName) throws Exception{
            OutputStream output=null;
            output = new FileOutputStream(locaFileName);
            ftp.retrieveFile(remoteFileName, output);
            output.close();
        }  

        /**
         * @param ftp
         * @throws Exception
         */
        private void setProperty(FTPClient ftp) throws Exception {
            ftp.enterLocalPassiveMode();
            //二进制传输,默认为ASCII
            ftp.setFileType(FTP.BINARY_FILE_TYPE);
        }  

        /**
         * @param ftp
         */
        private void logout(FTPClient ftp) throws Exception{
            ftp.noop();
            ftp.logout();
        }  

        /**
         * @param ftp
         * @param remoteFileName
         * @param locaFileName
         */
        private void upload(FTPClient ftp, String remoteFileName,
                String locaFileName) throws Exception{
            //上传
            InputStream input;  

            input = new FileInputStream(locaFileName);  

            ftp.storeFile(remoteFileName, input);  

            input.close();
        }  

        /**
         * @param ftp
         */
        private void connect(FTPClient ftp) throws Exception{
            //连接服务器
            ftp.connect( server, port);
            int reply = ftp.getReplyCode();
            //是否连接成功
            if ( !FTPReply.isPositiveCompletion( reply ) )         {
                throw new ConnectException( server+" 服务器拒绝连接" );
            }
            //登陆
            if (!ftp.login(username, password)) {
                 throw new ConnectException( "用户名或密码错误" );
            }
        }
    }  

FtpTest
    package com.demo.ftp;  

    /**
     * @author wobendiankun 2015-1-8 下午08:34:36
     */
    public class FtpTest {  

        public static void main(String[] args) {
            //上传文件
            //upload();
            //下载文件
            //download();
            //创建文件夹
            mkdir();
        }  

        /**
         *
         */
        private static void mkdir() {
            FtpClientUtil clientUtil=new FtpClientUtil();
            clientUtil.mkdir("test");
        }  

        /**
         *
         */
        private static void download() {
            String remoteFileName="./111.txt";
            String locaFileName="F:\\test\\txt\\3333.txt";
            FtpClientUtil clientUtil=new FtpClientUtil();
            clientUtil.download(remoteFileName, locaFileName);
        }  

        /**
         *
         */
        private static void upload() {
            String remoteFileName="./111.txt";
            String locaFileName="F:\\test\\txt\\aaa.txt";
            FtpClientUtil clientUtil=new FtpClientUtil();
            clientUtil.upload(remoteFileName, locaFileName);
        }
    }