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(); }}

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