Java實現FTP文件與文件夾的上傳和下載

　　FTP 是File Transfer Protocol（文件傳輸協議）的英文簡稱，而中文簡稱為“文傳協議”。用於Internet上的控制文件的雙向傳輸。同時，它也是一個應用程序（Application）。基於不同的操作系統有不同的FTP應用程序，而所有這些應用程序都遵守同一種協議以傳輸文件。在FTP的使用當中，用戶經常遇到兩個概念："下載"（Download）和"上傳"（Upload）。"下載"文件就是從遠程主機拷貝文件至自己的計算機上；"上傳"文件就是將文件從自己的計算機中拷貝至遠程主機上。用Internet語言來說，用戶可通過客戶機程序向（從）遠程主機上傳（下載）文件。

　　首先下載了Serv-U將自己的電腦設置為了FTP文件服務器，方便操作。下面代碼的使用都是在FTP服務器已經創建，並且要在代碼中寫好FTP連接的相關數據才可以完成。

1.FTP文件的上傳與下載(註意是單個文件的上傳與下載)

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

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;

/**
 * 實現FTP文件上傳和文件下載
 */
public class FtpApche {
    private static FTPClient ftpClient = new FTPClient();
    private static String encoding = System.getProperty("file.encoding");
    /**
     * Description: 向FTP服務器上傳文件
     * 
     * @Version1.0
     * @param url
     *            FTP服務器hostname
     * @param port
     *            FTP服務器端口
     * @param username
     *            FTP登錄賬號
     * @param password
     *            FTP登錄密碼
     * @param path
     *            FTP服務器保存目錄,如果是根目錄則為“/”
     * @param filename
     *            上傳到FTP服務器上的文件名
     * @param input
     *            本地文件輸入流
     * @return 成功返回true，否則返回false
     */
    public static boolean uploadFile(String url, int port, String username,
            String password, String path, String filename, InputStream input) {
        boolean result = false;

        try {
            int reply;
            // 如果采用默認端口，可以使用ftp.connect(url)的方式直接連接FTP服務器
            ftpClient.connect(url);
            // ftp.connect(url, port);// 連接FTP服務器
            // 登錄
            ftpClient.login(username, password);
            ftpClient.setControlEncoding(encoding);
            // 檢驗是否連接成功
            reply = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                System.out.println("連接失敗");
                ftpClient.disconnect();
                return result;
            }

            // 轉移工作目錄至指定目錄下
            boolean change = ftpClient.changeWorkingDirectory(path);
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
            if (change) {
                result = ftpClient.storeFile(new String(filename.getBytes(encoding),"iso-8859-1"), input);
                if (result) {
                    System.out.println("上傳成功!");
                }
            }
            input.close();
            ftpClient.logout();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                }
            }
        }
        return result;
    }

    /**
     * 將本地文件上傳到FTP服務器上
     * 
     */
    public void testUpLoadFromDisk() {
        try {
            FileInputStream in = new FileInputStream(new File("D:/test02/list.txt"));
            boolean flag = uploadFile("10.0.0.102", 21, "admin","123456", "/", "lis.txt", in);
            System.out.println(flag);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }


    /**
     * Description: 從FTP服務器下載文件
     * 
     * @Version1.0
     * @param url
     *            FTP服務器hostname
     * @param port
     *            FTP服務器端口
     * @param username
     *            FTP登錄賬號
     * @param password
     *            FTP登錄密碼
     * @param remotePath
     *            FTP服務器上的相對路徑
     * @param fileName
     *            要下載的文件名
     * @param localPath
     *            下載後保存到本地的路徑
     * @return
     */
    public static boolean downFile(String url, int port, String username,
            String password, String remotePath, String fileName,
            String localPath) {
        boolean result = false;
        try {
            int reply;
            ftpClient.setControlEncoding(encoding);
            
            /*
             *  為了上傳和下載中文文件，有些地方建議使用以下兩句代替
             *  new String(remotePath.getBytes(encoding),"iso-8859-1")轉碼。
             *  經過測試，通不過。
             */
//            FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
//            conf.setServerLanguageCode("zh");

            ftpClient.connect(url, port);
            // 如果采用默認端口，可以使用ftp.connect(url)的方式直接連接FTP服務器
            ftpClient.login(username, password);// 登錄
            // 設置文件傳輸類型為二進制
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            // 獲取ftp登錄應答代碼
            reply = ftpClient.getReplyCode();
            // 驗證是否登陸成功
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftpClient.disconnect();
                System.err.println("FTP server refused connection.");
                return result;
            }
            // 轉移到FTP服務器目錄至指定的目錄下
            ftpClient.changeWorkingDirectory(new String(remotePath.getBytes(encoding),"iso-8859-1"));
            // 獲取文件列表
            FTPFile[] fs = ftpClient.listFiles();
            for (FTPFile ff : fs) {
                if (ff.getName().equals(fileName)) {
                    File localFile = new File(localPath + "/" + ff.getName());
                    OutputStream is = new FileOutputStream(localFile);
                    ftpClient.retrieveFile(ff.getName(), is);
                    is.close();
                }
            }

            ftpClient.logout();
            result = true;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                }
            }
        }
        return result;
    }

    /**
     * 將FTP服務器上文件下載到本地
     * 
     */
    public void testDownFile() {
        try {
            boolean flag = downFile("10.0.0.102", 21, "admin",
                    "123456", "/", "ip.txt", "E:/");
            System.out.println(flag);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        FtpApche fa = new FtpApche();
        fa.testDownFile();
        fa.testUpLoadFromDisk();
    }
}

2.FTP文件夾的上傳與下載(註意是整個文件夾)

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 FTPTest_04 {
    private FTPClient ftpClient;
    private String strIp;
    private int intPort;
    private String user;
    private String password;
  
    private static Logger logger = Logger.getLogger(FTPTest_04.class.getName());
  
    /* * 
     * Ftp構造函數 
     */  
    public FTPTest_04(String strIp, int intPort, String user, String Password) {
        this.strIp = strIp;
        this.intPort = intPort;
        this.user = user;
        this.password = Password;
        this.ftpClient = new FTPClient();
    }
    /** 
     * @return 判斷是否登入成功 
     * */  
    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服務器連接回答  
            int reply = this.ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                this.ftpClient.disconnect();
                logger.error("登錄FTP服務失敗！");
                return isLogin;
            }
            this.ftpClient.login(this.user, this.password);
            // 設置傳輸協議  
            this.ftpClient.enterLocalPassiveMode();
            this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            logger.info("恭喜" + this.user + "成功登陸FTP服務器");
            isLogin = true;
        }catch (Exception e) {
            e.printStackTrace();
            logger.error(this.user + "登錄FTP服務失敗！" + e.getMessage());
        }
        this.ftpClient.setBufferSize(1024 * 2);
        this.ftpClient.setDataTimeout(30 * 1000);
        return isLogin;
    }
  
    /** 
     * @退出關閉服務器鏈接 
     * */  
    public void ftpLogOut() {
        if (null != this.ftpClient && this.ftpClient.isConnected()) {
            try {
                boolean reuslt = this.ftpClient.logout();// 退出FTP服務器  
                if (reuslt) {
                    logger.info("成功退出服務器");
                }
            }catch (IOException e) {
                e.printStackTrace();
                logger.warn("退出FTP服務器異常！" + e.getMessage());
            }finally {
                try {
                    this.ftpClient.disconnect();// 關閉FTP服務器的連接  
                }catch (IOException e) {
                    e.printStackTrace();
                    logger.warn("關閉FTP服務器的連接異常！");
                }
            }
        }
    }
  
    /*** 
     * 上傳Ftp文件 
     * @param localFile 當地文件 
     * @param romotUpLoadePath上傳服務器路徑 - 應該以/結束 
     * */  
    public boolean uploadFile(File localFile, String romotUpLoadePath) {
        BufferedInputStream inStream = null;
        boolean success = false;
        try {
            this.ftpClient.changeWorkingDirectory(romotUpLoadePath);// 改變工作路徑  
            inStream = new BufferedInputStream(new FileInputStream(localFile));
            logger.info(localFile.getName() + "開始上傳.....");
            success = this.ftpClient.storeFile(localFile.getName(), inStream);
            if (success == true) {
                logger.info(localFile.getName() + "上傳成功");
                return success;
            }
        }catch (FileNotFoundException e) {
            e.printStackTrace();
            logger.error(localFile + "未找到");
        }catch (IOException e) {
            e.printStackTrace();
        }finally {
            if (inStream != null) {
                try {
                    inStream.close();
                }catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return success;
    }
  
    /*** 
     * 下載文件 
     * @param remoteFileName   待下載文件名稱 
     * @param localDires 下載到當地那個路徑下 
     * @param remoteDownLoadPath remoteFileName所在的路徑 
     * */  
  
    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));
            logger.info(remoteFileName + "開始下載....");
            success = this.ftpClient.retrieveFile(remoteFileName, outStream);
            if (success == true) {
                logger.info(remoteFileName + "成功下載到" + strFilePath);
                return success;
            }
        }catch (Exception e) {
            e.printStackTrace();
            logger.error(remoteFileName + "下載失敗");
        }finally {
            if (null != outStream) {
                try {
                    outStream.flush();
                    outStream.close();
                }catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        if (success == false) {
            logger.error(remoteFileName + "下載失敗!!!");
        }
        return success;
    }
  
    /*** 
     * @上傳文件夾 
     * @param localDirectory 
     *            當地文件夾 
     * @param remoteDirectoryPath 
     *            Ftp 服務器路徑 以目錄"/"結束 
     * */  
    public boolean uploadDirectory(String localDirectory,  
            String remoteDirectoryPath) {
        File src = new File(localDirectory);
        try {
            remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/";
            boolean makeDirFlag = this.ftpClient.makeDirectory(remoteDirectoryPath);
            System.out.println("localDirectory : " + localDirectory);
            System.out.println("remoteDirectoryPath : " + remoteDirectoryPath);
            System.out.println("src.getName() : " + src.getName());
            System.out.println("remoteDirectoryPath : " + remoteDirectoryPath);
            System.out.println("makeDirFlag : " + makeDirFlag);
            // ftpClient.listDirectories();
        }catch (IOException e) {
            e.printStackTrace();
            logger.info(remoteDirectoryPath + "目錄創建失敗");
        }
        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()) {
                // 遞歸  
                uploadDirectory(allFile[currentFile].getPath().toString(),  
                        remoteDirectoryPath);
            }
        }
        return true;
    }
  
    /*** 
     * @下載文件夾 
     * @param localDirectoryPath本地地址 
     * @param remoteDirectory 遠程文件夾 
     * */  
    public boolean downLoadDirectory(String localDirectoryPath,String remoteDirectory) {
        try {
            String fileName = new File(remoteDirectory).getName();
            localDirectoryPath = localDirectoryPath + fileName + "//";
            new File(localDirectoryPath).mkdirs();
            FTPFile[] allFile = this.ftpClient.listFiles(remoteDirectory);
            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();
            logger.info("下載文件夾失敗");
            return false;
        }
        return true;
    }
    // FtpClient的Set 和 Get 函數  
    public FTPClient getFtpClient() {
        return ftpClient;
    }
    public void setFtpClient(FTPClient ftpClient) {
        this.ftpClient = ftpClient;
    }
      
    public static void main(String[] args) throws IOException {
        FTPTest_04 ftp=new FTPTest_04("10.0.0.102",21,"admin","123456");
        ftp.ftpLogin();
        System.out.println("1");
        //上傳文件夾  
        boolean uploadFlag = ftp.uploadDirectory("D:\\test02", "/"); //如果是admin/那麽傳的就是所有文件，如果只是/那麽就是傳文件夾
        System.out.println("uploadFlag : " + uploadFlag);
        //下載文件夾  
        ftp.downLoadDirectory("d:\\tm", "/");
        ftp.ftpLogOut();
    }
}

Java實現FTP文件與文件夾的上傳和下載