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上的控製文件的雙向傳輸。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(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; // 如果採用默認端口，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); // 如果採用默認端口，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 + "//"; 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/那麼傳的就是所有文件，如果只是/那麼就是傳文件夾System.out.println("uploadFlag : " + uploadFlag); //下載文件夾ftp.downLoadDirectory("d://tm", "/"); ftp.ftpLogOut(); }}

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