利用Apache commons-net 包进行FTP文件和文件夹的上传与下载

首先声明：这段代码是我在网上胡乱找的，调试后可用。

需要提前导入jar包，我导入的是：commons-net-3.0.1，在网上可以下载到。以下为源码，其中文件夹的下载存在问题：FTPFile[] allFile = this.ftpClient.listFiles("/uploadimagefiles");  listFiles()方法总是返回为空，问题仍未解决，如有大神，还请指点。

package Ftp;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.TimeZone;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.log4j.Logger;  

public class Ftp {
    private FTPClient ftpClient;
    private String strIp;
    private int intPort;
    private String user;
    private String password;  

    //Ftp构造函数
    public Ftp(String strIp, int intPort, String user, String password) {
        this.strIp = strIp;
        this.intPort = intPort;
        this.user = user;
        this.password = password;
        this.ftpClient = new FTPClient();
    }

    //登录到FTP服务器，判断是否登入成功，成功返回true，不成功返回false。
    public boolean ftpLogin() {
        boolean isLogin = false;
        FTPClientConfig ftpClientConfig = new FTPClientConfig();
        ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID());
        this.ftpClient.setControlEncoding("GBK");
        this.ftpClient.configure(ftpClientConfig);
        try {
            if (this.intPort > 0) {
                this.ftpClient.connect(this.strIp, this.intPort);
            } else {
                this.ftpClient.connect(this.strIp);
            }
            // FTP服务器连接回答
            int reply = this.ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                this.ftpClient.disconnect();
                System.out.println("登录FTP服务失败！");
                return isLogin;
            }
            this.ftpClient.login(this.user, this.password);
            // 设置传输协议
            this.ftpClient.enterLocalPassiveMode();
            this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            System.out.println("用户 " + this.user + " 成功登陆FTP服务器");
            isLogin = true;
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(this.user + "登录FTP服务失败！" + e.getMessage());
        }
        this.ftpClient.setBufferSize(1024 * 2);
        this.ftpClient.setDataTimeout(30 * 1000);
        return isLogin;
    }  

     	//退出关闭服务器链接
    public void ftpLogOut() {
        if (null != this.ftpClient && this.ftpClient.isConnected()) {
            try {
                boolean reuslt = this.ftpClient.logout();// 退出FTP服务器
                if (reuslt) {
                    System.out.println("成功退出服务器");
                }
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println("退出FTP服务器异常！" + e.getMessage());
            } finally {
                try {
                    this.ftpClient.disconnect();// 关闭FTP服务器的连接
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println("关闭FTP服务器的连接异常！");
                }
            }
        }
    }  

   // 上传Ftp文件      @param localFile 本地文件          @param romotUpLoadePath 远程服务器路径  -  应该以/结束
    public boolean uploadFile(File localFile, String romoteUpLoadePath) {
        BufferedInputStream inStream = null;
        boolean success = false;
        try {
            this.ftpClient.changeWorkingDirectory(romoteUpLoadePath);// 改变工作路径
            inStream = new BufferedInputStream(new FileInputStream(localFile));
            System.out.println(localFile.getName() + "开始上传.....");
            long beforeTime=System.currentTimeMillis();
            success = this.ftpClient.storeFile(localFile.getName(), inStream);
            long afterTime=System.currentTimeMillis();
            if (success == true) {
            	 double time=(afterTime-beforeTime)/1000.0;
                 double uploadSpeed=(localFile.length()/(time*1024));
                 uploadSpeed = (double)Math.round(uploadSpeed*100)/100;
                System.out.println(localFile.getName() + "上传成功,用时："+time+"秒."+"平均上传速度："+uploadSpeed+"KB/秒");
                return success;
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            System.out.println(localFile + "未找到");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inStream != null) {
                try {
                    inStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return success;
    }  

    /***
     * 下载文件
     * @param remoteFileName   待下载文件名称
     * @param localDires 下载到当地那个路径下
     * @param remoteDownLoadPath remoteFileName所在的路径
     * */
    public boolean downloadFile(String remoteFileName, String localDires,
            String remoteDownLoadPath) {
        String strFilePath = localDires + "/" + remoteFileName;
        BufferedOutputStream outStream = null;
        boolean success = false;
        try {
            this.ftpClient.changeWorkingDirectory(remoteDownLoadPath);
            outStream = new BufferedOutputStream(new FileOutputStream(strFilePath));
            System.out.println(remoteFileName + "开始下载....");
            long beforeTime=System.currentTimeMillis();
            success = this.ftpClient.retrieveFile(remoteFileName, outStream);
            long afterTime=System.currentTimeMillis();

            if (success == true) {
            	double time=(afterTime-beforeTime)/1000.0;
            	File file=new File(strFilePath);
            	long length=file.length();
                double downloadSpeed=(length/(time*1024));
                downloadSpeed = (double)Math.round(downloadSpeed*100)/100;
                System.out.println(remoteFileName + "成功下载到" + strFilePath+"用时"+time+"秒."+"平均下载速度："+downloadSpeed+"KB/秒");
                return success;
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(remoteFileName + "下载失败");
        } finally {
            if (null != outStream) {
                try {
                    outStream.flush();
                    outStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        if (success == false) {
            System.out.println(remoteFileName + "下载失败!!!");
        }
        return success;
    }  

    /***
     * @上传文件夹
     * @param localDirectory
     *            当地文件夹
     * @param remoteDirectoryPath
     *            Ftp 服务器路径 以目录"/"结束
     * */
    public boolean uploadDirectory(String localDirectory,
            String remoteDirectoryPath) {
        File src = new File(localDirectory);
        try {
            remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/";
            this.ftpClient.makeDirectory(remoteDirectoryPath);
            // ftpClient.listDirectories();
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println(remoteDirectoryPath + "目录创建失败");
        }
        File[] allFile = src.listFiles();
        for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
            if (!allFile[currentFile].isDirectory()) {
                String srcName = allFile[currentFile].getPath().toString();
                uploadFile(new File(srcName), remoteDirectoryPath);
            }
        }
        for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
            if (allFile[currentFile].isDirectory()) {
                // 递归
                uploadDirectory(allFile[currentFile].getPath().toString(),
                        remoteDirectoryPath);
            }
        }
        return true;
    }  

    /***
     * @下载文件夹
     * @param localDirectoryPath本地地址
     * @param remoteDirectory 远程文件夹
     * */
    public boolean downLoadDirectory(String localDirectoryPath,String remoteDirectory) {
        try {
            String fileName = new File(remoteDirectory).getName();
            localDirectoryPath = localDirectoryPath + "/"+ fileName + "/";
            new File(localDirectoryPath).mkdirs();
            ftpClient.enterLocalPassiveMode();
            FTPFile[] allFile = this.ftpClient.listFiles("/uploadimagefiles");
            for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
                if (!allFile[currentFile].isDirectory()) {
                    downloadFile(allFile[currentFile].getName(),localDirectoryPath, remoteDirectory);
                }
            }
            for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
                if (allFile[currentFile].isDirectory()) {
                    String strremoteDirectoryPath = remoteDirectory + "/"+ allFile[currentFile].getName();
                    downLoadDirectory(localDirectoryPath,strremoteDirectoryPath);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("下载文件夹失败");
            return false;
        }
        return true;
    }
    // FtpClient的Set 和 Get 函数
    public FTPClient getFtpClient() {
        return ftpClient;
    }
    public void setFtpClient(FTPClient ftpClient) {
        this.ftpClient = ftpClient;
    }  

    public static void main(String[] args) throws IOException {
     //   Ftp ftp=new Ftp("172.19.211.0",21,"Vincent","wanghe");
    //    ftp.ftpLogin();
        //上传文件夹
        //ftp.uploadDirectory("e://a1", "/");
        //下载文件夹
      //  ftp.downLoadDirectory("d://shixizkr", "/uploadimagefiles/");
      // File file = new File("e://余罪.mp4");
       //ftp.uploadFile(file, "/uploadimagefiles");
    //   ftp.downloadFile("余罪.mp4", "e://a1", "/uploadimagefiles");
       // ftp.ftpLogOut();
    }
}