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[ASP.net教程]Java实现FTP文件与文件夹的上传和下载


Java实现FTP文件与文件夹的上传和下载

  FTP 是File Transfer Protocol(文件传输协议)的英文简称,而中文简称为“文传协议”。用于Internet上的控制文件的双向传输。同时,它也是一个应用程序(Application)。基于不同的操作系统有不同的FTP应用程序,而所有这些应用程序都遵守同一种协议以传输文件。在FTP的使用当中,用户经常遇到两个概念:"下载"(Download)和"上传"(Upload)。"下载"文件就是从远程主机拷贝文件至自己的计算机上;"上传"文件就是将文件从自己的计算机中拷贝至远程主机上。用Internet语言来说,用户可通过客户机程序向(从)远程主机上传(下载)文件。

  首先下载了Serv-U将自己的电脑设置为了FTP文件服务器,方便操作。下面代码的使用都是在FTP服务器已经创建,并且要在代码中写好FTP连接的相关数据才可以完成。

1.FTP文件的上传与下载(注意是单个文件的上传与下载)

 

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;/** * 实现FTP文件上传和文件下载 */public class FtpApche {  private static FTPClient ftpClient = new FTPClient();  private static String encoding = System.getProperty("file.encoding");  /**   * Description: 向FTP服务器上传文件   *   * @Version1.0   * @param url   *      FTP服务器hostname   * @param port   *      FTP服务器端口   * @param username   *      FTP登录账号   * @param password   *      FTP登录密码   * @param path   *      FTP服务器保存目录,如果是根目录则为“/”   * @param filename   *      上传到FTP服务器上的文件名   * @param input   *      本地文件输入流   * @return 成功返回true,否则返回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;      // 如果采用默认端口,可以使用ftp.connect(url)的方式直接连接FTP服务器      ftpClient.connect(url);      // ftp.connect(url, port);// 连接FTP服务器      // 登录      ftpClient.login(username, password);      ftpClient.setControlEncoding(encoding);      // 检验是否连接成功      reply = ftpClient.getReplyCode();      if (!FTPReply.isPositiveCompletion(reply)) {        System.out.println("连接失败");        ftpClient.disconnect();        return result;      }      // 转移工作目录至指定目录下      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("上传成功!");        }      }      input.close();      ftpClient.logout();    } catch (IOException e) {      e.printStackTrace();    } finally {      if (ftpClient.isConnected()) {        try {          ftpClient.disconnect();        } catch (IOException ioe) {        }      }    }    return result;  }  /**   * 将本地文件上传到FTP服务器上   *   */  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: 从FTP服务器下载文件   *   * @Version1.0   * @param url   *      FTP服务器hostname   * @param port   *      FTP服务器端口   * @param username   *      FTP登录账号   * @param password   *      FTP登录密码   * @param remotePath   *      FTP服务器上的相对路径   * @param fileName   *      要下载的文件名   * @param localPath   *      下载后保存到本地的路径   * @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);            /*       * 为了上传和下载中文文件,有些地方建议使用以下两句代替       * new String(remotePath.getBytes(encoding),"iso-8859-1")转码。       * 经过测试,通不过。       *///      FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);//      conf.setServerLanguageCode("zh");      ftpClient.connect(url, port);      // 如果采用默认端口,可以使用ftp.connect(url)的方式直接连接FTP服务器      ftpClient.login(username, password);// 登录      // 设置文件传输类型为二进制      ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);      // 获取ftp登录应答代码      reply = ftpClient.getReplyCode();      // 验证是否登陆成功      if (!FTPReply.isPositiveCompletion(reply)) {        ftpClient.disconnect();        System.err.println("FTP server refused connection.");        return result;      }      // 转移到FTP服务器目录至指定的目录下      ftpClient.changeWorkingDirectory(new String(remotePath.getBytes(encoding),"iso-8859-1"));      // 获取文件列表      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;  }  /**   * 将FTP服务器上文件下载到本地   *   */  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文件夹的上传与下载(注意是整个文件夹)

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构造函数   */   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 判断是否登入成功   * */   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服务器连接回答       int reply = this.ftpClient.getReplyCode();      if (!FTPReply.isPositiveCompletion(reply)) {        this.ftpClient.disconnect();        logger.error("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);      logger.info("恭喜" + this.user + "成功登陆FTP服务器");      isLogin = true;    }catch (Exception e) {      e.printStackTrace();      logger.error(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) {          logger.info("成功退出服务器");        }      }catch (IOException e) {        e.printStackTrace();        logger.warn("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();          logger.warn("关闭FTP服务器的连接异常!");        }      }    }  }   /***   * 上传Ftp文件   * @param localFile 当地文件   * @param romotUpLoadePath上传服务器路径 - 应该以/结束   * */   public boolean uploadFile(File localFile, String romotUpLoadePath) {    BufferedInputStream inStream = null;    boolean success = false;    try {      this.ftpClient.changeWorkingDirectory(romotUpLoadePath);// 改变工作路径       inStream = new BufferedInputStream(new FileInputStream(localFile));      logger.info(localFile.getName() + "开始上传.....");      success = this.ftpClient.storeFile(localFile.getName(), inStream);      if (success == true) {        logger.info(localFile.getName() + "上传成功");        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));      logger.info(remoteFileName + "开始下载....");      success = this.ftpClient.retrieveFile(remoteFileName, outStream);      if (success == true) {        logger.info(remoteFileName + "成功下载到" + strFilePath);        return success;      }    }catch (Exception e) {      e.printStackTrace();      logger.error(remoteFileName + "下载失败");    }finally {      if (null != outStream) {        try {          outStream.flush();          outStream.close();        }catch (IOException e) {          e.printStackTrace();        }      }    }    if (success == false) {      logger.error(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() + "/";      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();      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 {    FTPTest_04 ftp=new FTPTest_04("10.0.0.102",21,"admin","123456");    ftp.ftpLogin();    System.out.println("1");    //上传文件夹     boolean uploadFlag = ftp.uploadDirectory("D:\\test02", "/"); //如果是admin/那么传的就是所有文件,如果只是/那么就是传文件夹    System.out.println("uploadFlag : " + uploadFlag);    //下载文件夹     ftp.downLoadDirectory("d:\\tm", "/");    ftp.ftpLogOut();  }}