JAVA中應用FTPClient完成文件上傳下載實例代碼。本站提示廣大學習愛好者:(JAVA中應用FTPClient完成文件上傳下載實例代碼)文章只能為提供參考,不一定能成為您想要的結果。以下是JAVA中應用FTPClient完成文件上傳下載實例代碼正文
在java法式開辟中,ftp用的比擬多,常常打交道,好比說向FTP辦事器上傳文件、下載文件,本文給年夜家引見若何應用jakarta commons中的FTPClient(在commons-net包中)完成上傳下載文件。
1、上傳文件
道理就不引見了,年夜家直接看代碼吧
/** * Description: 向FTP辦事器上傳文件 * @Version1.0 Jul 27, 2008 4:31:09 PM by 崔紅保([email protected])創立 * @param url FTP辦事器hostname * @param port FTP辦事器端口 * @param username FTP登錄賬號 * @param password FTP登錄暗碼 * @param path FTP辦事器保留目次 * @param filename 上傳到FTP辦事器上的文件名 * @param input 輸出流 * @return 勝利前往true,不然前往false */ publicstaticboolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) { boolean success = false; FTPClient ftp = new FTPClient(); try { int reply; ftp.connect(url, port);//銜接FTP辦事器 //假如采取默許端口,可使用ftp.connect(url)的方法直接銜接FTP辦事器 ftp.login(username, password);//登錄 reply = ftp.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); return success; } ftp.changeWorkingDirectory(path); ftp.storeFile(filename, input); input.close(); ftp.logout(); success = true; } catch (IOException e) { e.printStackTrace(); } finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException ioe) { } } } return success; }<pre></pre> /** * Description: 向FTP辦事器上傳文件 * @Version1.0 Jul 27, 2008 4:31:09 PM by 崔紅保([email protected])創立 * @param url FTP辦事器hostname * @param port FTP辦事器端口 * @param username FTP登錄賬號 * @param password FTP登錄暗碼 * @param path FTP辦事器保留目次 * @param filename 上傳到FTP辦事器上的文件名 * @param input 輸出流 * @return 勝利前往true,不然前往false */ public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) { boolean success = false; FTPClient ftp = new FTPClient(); try { int reply; ftp.connect(url, port);//銜接FTP辦事器 //假如采取默許端口,可使用ftp.connect(url)的方法直接銜接FTP辦事器 ftp.login(username, password);//登錄 reply = ftp.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); return success; } ftp.changeWorkingDirectory(path); ftp.storeFile(filename, input); input.close(); ftp.logout(); success = true; } catch (IOException e) { e.printStackTrace(); } finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException ioe) { } } } return success; }
上面我們寫兩個小例子:
1.將當地文件上傳到FTP辦事器上,代碼以下:
@Test publicvoid testUpLoadFromDisk(){ try { FileInputStream in=new FileInputStream(new File("D:/test.txt")); boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in); System.out.println(flag); } catch (FileNotFoundException e) { e.printStackTrace(); } }<pre></pre> @Test public void testUpLoadFromDisk(){ try { FileInputStream in=new FileInputStream(new File("D:/test.txt")); boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in); System.out.println(flag); } catch (FileNotFoundException e) { e.printStackTrace(); } }
2.在FTP辦事器上生成一個文件,並將一個字符串寫入到該文件中
@Test publicvoid testUpLoadFromString(){ try { InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8")); boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input); System.out.println(flag); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } }<pre></pre> @Test public void testUpLoadFromString(){ try { InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8")); boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input); System.out.println(flag); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } }
2、下載文件
從FTP辦事器下載文件的代碼也很簡略,參考以下:
/** * Description: 從FTP辦事器下載文件 * @Version. Jul , :: PM by 崔紅保([email protected])創立 * @param url FTP辦事器hostname * @param port FTP辦事器端口 * @param username FTP登錄賬號 * @param password FTP登錄暗碼 * @param remotePath FTP辦事器上的絕對途徑 * @param fileName 要下載的文件名 * @param localPath 下載後保留到當地的途徑 * @return */ publicstaticboolean downFile(String url, int port,String username, String password, String remotePath,String fileName,String localPath) { boolean success = false; FTPClient ftp = new FTPClient(); try { int reply; ftp.connect(url, port); //假如采取默許端口,可使用ftp.connect(url)的方法直接銜接FTP辦事器 ftp.login(username, password);//登錄 reply = ftp.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); return success; } ftp.changeWorkingDirectory(remotePath);//轉移到FTP辦事器目次 FTPFile[] fs = ftp.listFiles(); for(FTPFile ff:fs){ if(ff.getName().equals(fileName)){ File localFile = new File(localPath+"/"+ff.getName()); OutputStream is = new FileOutputStream(localFile); ftp.retrieveFile(ff.getName(), is); is.close(); } } ftp.logout(); success = true; } catch (IOException e) { e.printStackTrace(); } finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException ioe) { } } } return success; }<pre></pre>