Apache commons-net用法的一个示例

jar:

commons-io-2.4.jar
commons-net-3.3.jar

Code：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import java.util.List;

import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

import entity.Config;

public class FTPUtil {
    private Config _config;

    public FTPUtil(Config config) {
        this._config = config;
    }

    public void download(String remoteDir, List<String> remoteFileNames, String localDir) throws IOException{
        FTPClient ftp = new FTPClient();
        try {
            connectServer(ftp);
            configFTPClient(ftp);
            ftp.changeWorkingDirectory(remoteDir);

            for (String remote : remoteFileNames) {
                long begin=System.currentTimeMillis();

                OutputStream local = new FileOutputStream(new File(localDir,remote));
                ////retrieveFile的第一个参数需要是 ISO-8859-1 编码
                //new String(fileName.getBytes("GBK"),"ISO-8859-1")
                boolean result = ftp.retrieveFile(remote, local);

                long end=System.currentTimeMillis();
                System.out.println(remote+":"+(end-begin)+"ms");

                System.out.println("result:"+result);
                local.flush();
                local.close();
            }

        } finally {
            closeFtpClient(ftp);
        }
    }

    public void upload(String remoteDir,String localDir, List<String> localFileNames) throws IOException{
        FTPClient ftp = new FTPClient();
        try {
            connectServer(ftp);
            configFTPClient(ftp);
            ftp.changeWorkingDirectory(remoteDir);

            for (String localFileName : localFileNames) {
                long begin=System.currentTimeMillis();

                InputStream local=new FileInputStream(new File(localDir,localFileName));
                boolean result = ftp.storeFile(localFileName,local);

                long end=System.currentTimeMillis();
                System.out.println(localFileName+":"+(end-begin)+"ms");

                System.out.println("result:"+result);
                IOUtils.closeQuietly(local);
            }

        } finally {
            closeFtpClient(ftp);
        }

    }

    private void closeFtpClient(FTPClient ftp) {
        if (ftp.isConnected()) {
            try {
                ftp.logout();
                ftp.disconnect();
            } catch (IOException ioe) {
                System.out.println("Fail to close.");
            }
        }
    }

    private void configFTPClient(FTPClient ftp) throws IOException {
        final int _1MB=1024;
        ////如果缺省该句 传输txt正常 但图片和其他格式的文件传输可能会出现未知异常
        ftp.setFileType(FTP.BINARY_FILE_TYPE);
        ftp.enterLocalPassiveMode();
        System.out.println("ftp.getBufferSize():"+ftp.getBufferSize());
        ftp.setBufferSize(_1MB);
    }

    private void connectServer(FTPClient ftp) throws SocketException,
            IOException {
        int reply;
        ftp.connect(_config.getHostName(), _config.getPort());
        ftp.login(_config.getUsername(), _config.getPassword());
        // After connection attempt, you should check the reply code to verify
        // success.
        reply = ftp.getReplyCode();

        // 以2开头的返回值就会为真
        if (!FTPReply.isPositiveCompletion(reply)) {
            ftp.disconnect();
            System.err.println("FTP server refused connection.");
            throw new RuntimeException("FTP server refused connection:"
                    + ftp.getReplyString());
        }

    }

}

package switchplat.entity;

import java.util.List;
import java.util.Map;

public class Config {
    public String getHostName() {
        return this._hostName;
    }
    public void setHostName(String hostName) {
        this._hostName = hostName;
    }
    public int getPort() {
        return this._port;
    }
    public void setPort(int port) {
        this._port = port;
    }
    public String getUsername() {
        return this._username;
    }
    public void setUsername(String username) {
        this._username = username;
    }
    public String getPassword() {
        return this._password;
    }
    public void setPassword(String password) {
        this._password = password;
    }
    public Map<String, List<String>> getFilesToDownload() {
        return this._filesToDownload;
    }
    public void setFilesToDownload(Map<String, List<String>> filesToDownload) {
        this._filesToDownload = filesToDownload;
    }
    public Map<String, List<String>> getFilesToUpload() {
        return this._filesToUpload;
    }
    public void setFilesToUpload(Map<String, List<String>> filesToUpload) {
        this._filesToUpload = filesToUpload;
    }

    private String _hostName;
    private int _port=21;
    private String _username;
    private String _password;
    private Map<String,List<String>> _filesToDownload;
    private Map<String,List<String>> _filesToUpload;

}

Extension Part:

private String userName = "anonymous";//匿名登录，空字符串不行
private String password = "";//随便一个地址，我胡乱写一个也可以运行的
默认情况下，FtpClient使用的是UTF_8字符集作为服务器通讯的编码集。而FTP服务器SERV-U在windowsXP上，使用GBK字符集作为服务器通讯。

// 下面三行代码必须要，而且不能改变编码格式，否则不能正确下载中文文件
ftp.setControlEncoding("GBK");
FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
conf.setServerLanguageCode("zh");

http://yijingjia.blog.sohu.com/170731845.html

http://www.open-open.com/lib/view/open1329922375281.html

         /**
         * 重命名文件
         *
         * @param oldFileName --原文件名
         * @param newFileName --新文件名
         */
         public static void renameFile(String oldFileName, String newFileName) {
                 try {
                        connectServer();
                        ftpClient.rename(oldFileName, newFileName);
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                }
        } 

         /**
         * 设置FTP客服端的配置--一般可以不设置
         *
         * @return ftpConfig
         */
         private static FTPClientConfig getFtpConfig() {
                FTPClientConfig ftpConfig = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
                ftpConfig.setServerLanguageCode(FTP.DEFAULT_CONTROL_ENCODING);
                 return ftpConfig;
        } 

         /**
         * 在服务器上创建一个文件夹
         *
         * @param dir 文件夹名称，不能含有特殊字符，如 \ 、/ 、: 、* 、?、 "、 <、>...
         */
         public static boolean makeDirectory(String dir) {
                connectServer();
                 boolean flag = true;
                 try {
                         // System.out.println("dir=======" dir);
                        flag = ftpClient.makeDirectory(dir);
                         if (flag) {
                                System.out.println( "make Directory " + dir + " succeed"); 

                        } else { 

                                System.out.println( "make Directory " + dir + " false");
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
                 return flag;
        } 

         /**
         * 连接到服务器
         *
         * @return true 连接服务器成功，false 连接服务器失败
         */
         public static boolean connectServer() {
                 boolean flag = true;
                 if (ftpClient == null) {
                         int reply;
                         try {
                                setArg(configFile);
                                ftpClient = new FTPClient();
                                ftpClient.setControlEncoding( "GBK");
                                ftpClient.setDefaultPort(port);
                                ftpClient.configure(getFtpConfig());
                                ftpClient.connect(ip);
                                ftpClient.login(userName, password);
                                ftpClient.setDefaultPort(port);
                                 //System.out.print(ftpClient.getReplyString());
                                reply = ftpClient.getReplyCode();
                                ftpClient.setDataTimeout(120000); 

                                 if (!FTPReply.isPositiveCompletion(reply)) {
                                        ftpClient.disconnect();
                                        System.err.println( "FTP server refused connection.");
                                         // logger.debug("FTP 服务拒绝连接！");
                                        flag = false;
                                }
//                                System.out.println(i);
                                i++;
                        } catch (SocketException e) {
                                flag = false;
                                e.printStackTrace();
                                System.err.println( "登录ftp服务器 " + ip + " 失败,连接超时！");
                        } catch (IOException e) {
                                flag = false;
                                e.printStackTrace();
                                System.err.println( "登录ftp服务器 " + ip + " 失败，FTP服务器无法打开！");
                        }
                }
                 return flag;
        } 

    /**
         * 删除一个文件
         */
         public static boolean deleteFile(String filename) {
                 boolean flag = true;
                 try {
                        connectServer();
                        flag = ftpClient.deleteFile(filename);
                         if (flag) {
                                System.out.println( "删除文件成功！");
                        } else {
                                System.out.println( "删除文件失败！");
                        }
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                }
                 return flag;
        } 

         /**
         * 删除目录
         */
         public static void deleteDirectory(String pathname) {
                 try {
                        connectServer();
                        File file = new File(pathname);
                         if (file.isDirectory()) {
                                File file2[] = file.listFiles();
                        } else {
                                deleteFile(pathname);
                        }
                        ftpClient.removeDirectory(pathname);
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                }
        } 

         /**
         * 删除空目录
         */
         public static void deleteEmptyDirectory(String pathname) {
                 try {
                        connectServer();
                        ftpClient.removeDirectory(pathname);
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                }
        } 

         /**
         * 列出服务器上文件和目录
         *
         * @param regStr --匹配的正则表达式
         */
         public static void listRemoteFiles(String regStr) {
                connectServer();
                 try {
                        String files[] = ftpClient.listNames(regStr);
                         if (files == null || files.length == 0)
                                System.out.println( "没有任何文件!");
                         else {
                                 for ( int i = 0; i < files.length; i++) {
                                        System.out.println(files[i]);
                                }
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
        } 

         /**
         * 列出Ftp服务器上的所有文件和目录
         */
         public static void listRemoteAllFiles() {
                connectServer();
                 try {
                        String[] names = ftpClient.listNames();
                         for ( int i = 0; i < names.length; i++) {
                                System.out.println(names[i]);
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
        } 

http://www.open-open.com/lib/view/open1325816800031.html

1.支持上传下载。支持断点续传
2.支持进度汇报
3.支持对于中文目录及中文文件创建的支持。

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;   

import open.mis.data.DownloadStatus;
import open.mis.data.UploadStatus;   

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.FTPFile;
import org.apache.commons.net.ftp.FTPReply;   

/** *//**
 * 支持断点续传的FTP实用类
 * @author BenZhou  http://www.bt285.cn
 * @version 0.1 实现基本断点上传下载
 * @version 0.2 实现上传下载进度汇报
 * @version 0.3 实现中文目录创建及中文文件创建，添加对于中文的支持
 */
public class ContinueFTP {
    public FTPClient ftpClient = new FTPClient();   

    public ContinueFTP(){
        //设置将过程中使用到的命令输出到控制台
        this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
    }   

    /** *//**
     * 连接到FTP服务器
     * @param hostname 主机名
     * @param port 端口
     * @param username 用户名
     * @param password 密码
     * @return 是否连接成功
     * @throws IOException
     */
    public boolean connect(String hostname,int port,String username,String password) throws IOException{
        ftpClient.connect(hostname, port);
        ftpClient.setControlEncoding("GBK");
        if(FTPReply.isPositiveCompletion(ftpClient.getReplyCode())){
            if(ftpClient.login(username, password)){
                return true;
            }
        }
        disconnect();
        return false;
    }   

    /** *//**
     * 从FTP服务器上下载文件,支持断点续传，上传百分比汇报
     * @param remote 远程文件路径
     * @param local 本地文件路径
     * @return 上传的状态
     * @throws IOException
     */
    public DownloadStatus download(String remote,String local) throws IOException{
        //设置被动模式
        ftpClient.enterLocalPassiveMode();
        //设置以二进制方式传输
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
        DownloadStatus result;   

        //检查远程文件是否存在
        FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("GBK"),"iso-8859-1"));
        if(files.length != 1){
            System.out.println("远程文件不存在");
            return DownloadStatus.Remote_File_Noexist;
        }   

        long lRemoteSize = files[0].getSize();
        File f = new File(local);
        //本地存在文件，进行断点下载
        if(f.exists()){
            long localSize = f.length();
            //判断本地文件大小是否大于远程文件大小
            if(localSize >= lRemoteSize){
                System.out.println("本地文件大于远程文件，下载中止");
                return DownloadStatus.Local_Bigger_Remote;
            }   

            //进行断点续传，并记录状态
            FileOutputStream out = new FileOutputStream(f,true);
            ftpClient.setRestartOffset(localSize);
            InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));
            byte[] bytes = new byte[1024];
            long step = lRemoteSize /100;
            long process=localSize /step;
            int c;
            while((c = in.read(bytes))!= -1){
                out.write(bytes,0,c);
                localSize+=c;
                long nowProcess = localSize /step;
                if(nowProcess > process){
                    process = nowProcess;
                    if(process % 10 == 0)
                        System.out.println("下载进度："+process);
                    //TODO 更新文件下载进度,值存放在process变量中
                }
            }
            in.close();
            out.close();
            boolean isDo = ftpClient.completePendingCommand();
            if(isDo){
                result = DownloadStatus.Download_From_Break_Success;
            }else {
                result = DownloadStatus.Download_From_Break_Failed;
            }
        }else {
            OutputStream out = new FileOutputStream(f);
            InputStream in= ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));
            byte[] bytes = new byte[1024];
            long step = lRemoteSize /100;
            long process=0;
            long localSize = 0L;
            int c;
            while((c = in.read(bytes))!= -1){
                out.write(bytes, 0, c);
                localSize+=c;
                long nowProcess = localSize /step;
                if(nowProcess > process){
                    process = nowProcess;
                    if(process % 10 == 0)
                        System.out.println("下载进度："+process);
                    //TODO 更新文件下载进度,值存放在process变量中
                }
            }
            in.close();
            out.close();
            boolean upNewStatus = ftpClient.completePendingCommand();
            if(upNewStatus){
                result = DownloadStatus.Download_New_Success;
            }else {
                result = DownloadStatus.Download_New_Failed;
            }
        }
        return result;
    }   

    /** *//**
     * 上传文件到FTP服务器，支持断点续传
     * @param local 本地文件名称，绝对路径
     * @param remote 远程文件路径，使用/home/directory1/subdirectory/file.ext或是 http://www.guihua.org /subdirectory/file.ext 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
     * @return 上传结果
     * @throws IOException
     */
    public UploadStatus upload(String local,String remote) throws IOException{
        //设置PassiveMode传输
        ftpClient.enterLocalPassiveMode();
        //设置以二进制流的方式传输
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
        ftpClient.setControlEncoding("GBK");
        UploadStatus result;
        //对远程目录的处理
        String remoteFileName = remote;
        if(remote.contains("/")){
            remoteFileName = remote.substring(remote.lastIndexOf("/")+1);
            //创建服务器远程目录结构，创建失败直接返回
            if(CreateDirecroty(remote, ftpClient)==UploadStatus.Create_Directory_Fail){
                return UploadStatus.Create_Directory_Fail;
            }
        }   

        //检查远程是否存在文件
        FTPFile[] files = ftpClient.listFiles(new String(remoteFileName.getBytes("GBK"),"iso-8859-1"));
        if(files.length == 1){
            long remoteSize = files[0].getSize();
            File f = new File(local);
            long localSize = f.length();
            if(remoteSize==localSize){
                return UploadStatus.File_Exits;
            }else if(remoteSize > localSize){
                return UploadStatus.Remote_Bigger_Local;
            }   

            //尝试移动文件内读取指针,实现断点续传
            result = uploadFile(remoteFileName, f, ftpClient, remoteSize);   

            //如果断点续传没有成功，则删除服务器上文件，重新上传
            if(result == UploadStatus.Upload_From_Break_Failed){
                if(!ftpClient.deleteFile(remoteFileName)){
                    return UploadStatus.Delete_Remote_Faild;
                }
                result = uploadFile(remoteFileName, f, ftpClient, 0);
            }
        }else {
            result = uploadFile(remoteFileName, new File(local), ftpClient, 0);
        }
        return result;
    }
    /** *//**
     * 断开与远程服务器的连接
     * @throws IOException
     */
    public void disconnect() throws IOException{
        if(ftpClient.isConnected()){
            ftpClient.disconnect();
        }
    }   

    /** *//**
     * 递归创建远程服务器目录
     * @param remote 远程服务器文件绝对路径
     * @param ftpClient FTPClient对象
     * @return 目录创建是否成功
     * @throws IOException
     */
    public UploadStatus CreateDirecroty(String remote,FTPClient ftpClient) throws IOException{
        UploadStatus status = UploadStatus.Create_Directory_Success;
        String directory = remote.substring(0,remote.lastIndexOf("/")+1);
        if(!directory.equalsIgnoreCase("/")&&!ftpClient.changeWorkingDirectory(new String(directory.getBytes("GBK"),"iso-8859-1"))){
            //如果远程目录不存在，则递归创建远程服务器目录
            int start=0;
            int end = 0;
            if(directory.startsWith("/")){
                start = 1;
            }else{
                start = 0;
            }
            end = directory.indexOf("/",start);
            while(true){
                String subDirectory = new String(remote.substring(start,end).getBytes("GBK"),"iso-8859-1");
                if(!ftpClient.changeWorkingDirectory(subDirectory)){
                    if(ftpClient.makeDirectory(subDirectory)){
                        ftpClient.changeWorkingDirectory(subDirectory);
                    }else {
                        System.out.println("创建目录失败");
                        return UploadStatus.Create_Directory_Fail;
                    }
                }   

                start = end + 1;
                end = directory.indexOf("/",start);   

                //检查所有目录是否创建完毕
                if(end <= start){
                    break;
                }
            }
        }
        return status;
    }   

    /** *//**
     * 上传文件到服务器,新上传和断点续传
     * @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变
     * @param localFile 本地文件File句柄，绝对路径
     * @param processStep 需要显示的处理进度步进值
     * @param ftpClient FTPClient引用
     * @return
     * @throws IOException
     */
    public UploadStatus uploadFile(String remoteFile,File localFile,FTPClient ftpClient,long remoteSize) throws IOException{
        UploadStatus status;
        //显示进度的上传
        long step = localFile.length() / 100;
        long process = 0;
        long localreadbytes = 0L;
        RandomAccessFile raf = new RandomAccessFile(localFile,"r");
        OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes("GBK"),"iso-8859-1"));
        //断点续传
        if(remoteSize>0){
            ftpClient.setRestartOffset(remoteSize);
            process = remoteSize /step;
            raf.seek(remoteSize);
            localreadbytes = remoteSize;
        }
        byte[] bytes = new byte[1024];
        int c;
        while((c = raf.read(bytes))!= -1){
            out.write(bytes,0,c);
            localreadbytes+=c;
            if(localreadbytes / step != process){
                process = localreadbytes / step;
                System.out.println("上传进度:" + process);
                //TODO 汇报上传状态
            }
        }
        out.flush();
        raf.close();
        out.close();
        boolean result =ftpClient.completePendingCommand();
        if(remoteSize > 0){
            status = result?UploadStatus.Upload_From_Break_Success:UploadStatus.Upload_From_Break_Failed;
        }else {
            status = result?UploadStatus.Upload_New_File_Success:UploadStatus.Upload_New_File_Failed;
        }
        return status;
    }   

    public static void main(String[] args) {
        ContinueFTP myFtp = new ContinueFTP();
        try {
            myFtp.connect("192.168.21.181", 21, "nid", "123");
//          myFtp.ftpClient.makeDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));
//          myFtp.ftpClient.changeWorkingDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));
//          myFtp.ftpClient.makeDirectory(new String("走西口".getBytes("GBK"),"iso-8859-1"));
//          System.out.println(myFtp.upload("http://www.5a520.cn /yw.flv", "/yw.flv",5));
//          System.out.println(myFtp.upload("http://www.5a520.cn /走西口24.mp4","/央视走西口/新浪网/走西口24.mp4"));
            System.out.println(myFtp.download("/央视走西口/新浪网/走西口24.mp4", "E:\\走西口242.mp4"));
            myFtp.disconnect();
        } catch (IOException e) {
            System.out.println("连接FTP出错："+e.getMessage());
        }
    }
}

http://www.cnblogs.com/tt_mc/archive/2010/03/22/1691708.html