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”。用于Internet上的控制文件的雙向傳輸。同時,它也是一個應用程序(Application)。基于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,并且要在代碼中寫好FTP連接的相關數據才可以完成。
1.FTP文件的上傳與下載(注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  *   下載后保存到本地的路徑  * @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(注意是整個文件夾)
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 + "http://";   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/那么傳的就是所有文件,如果只是/那么就是傳文件夾  System.out.println("uploadFlag : " + uploadFlag);  //下載文件夾   ftp.downLoadDirectory("d://tm", "/");  ftp.ftpLogOut(); }}以上就是本文的全部內容,希望本文的內容對大家的學習或者工作能帶來一定的幫助,同時也希望多多支持武林網!
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