JAVA操作FTP文件服务器上传与下载文件

package util; import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.MalformedURLException; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.net.ftp.FTPReply; public class ftpUtil { public FTPClient ftpClient = null; /** * 初始化ftp服务器 */ public void initFtpClient(String hostname, Integer port, String username, String password) { ftpClient = new FTPClient(); ftpClient.setControlEncoding("utf-8"); try { System.out.println("connecting...ftp服务器:" + hostname + ":" + port); ftpClient.connect(hostname, port); // 连接ftp服务器 ftpClient.login(username, password); // 登录ftp服务器 int replyCode = ftpClient.getReplyCode(); // 是否成功登录服务器 if (!FTPReply.isPositiveCompletion(replyCode)) { System.out.println("connect failed...ftp服务器:" + hostname + ":" + port); } System.out.println("connect successfu...ftp服务器:" + hostname + ":" + port); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 上传文件 * * @param pathname ftp服务保存地址 * @param fileName 上传到ftp的文件名 * @param originfilename 待上传文件的名称（绝对地址） * * @return */ /* * public boolean uploadFile(String pathname, String fileName, String originfilename) { boolean * flag = false; InputStream inputStream = null; try { System.out.println("开始上传文件"); inputStream = * new FileInputStream(new File(originfilename)); initFtpClient(); * ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE); CreateDirecroty(pathname); * ftpClient.makeDirectory(pathname); ftpClient.changeWorkingDirectory(pathname); * ftpClient.storeFile(fileName, inputStream); inputStream.close(); ftpClient.logout(); flag = * true; System.out.println("上传文件成功"); } catch (Exception e) { System.out.println("上传文件失败"); * e.printStackTrace(); } finally { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } * catch (IOException e) { e.printStackTrace(); } } if (null != inputStream) { try { * inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return true; } */ /** * 上传文件 * * @param pathname ftp服务保存地址 * @param fileName 上传到ftp的文件名 * @param inputStream 输入文件流 * @return */ public boolean uploadFile(String pathname, String fileName, InputStream inputStream, String hostname, Integer port, String username, String password) { boolean flag = false; try { System.out.println("开始上传文件"); initFtpClient(hostname, port, username, password); ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE); CreateDirecroty(pathname); // ftpClient.makeDirectory(pathname); // ftpClient.changeWorkingDirectory(pathname); ftpClient.storeFile(fileName, inputStream); inputStream.close(); ftpClient.logout(); flag = true; System.out.println("上传文件成功"); } catch (Exception e) { System.out.println("上传文件失败"); e.printStackTrace(); } finally { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } catch (IOException e) { e.printStackTrace(); } } if (null != inputStream) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return true; } // 改变目录路径 public boolean changeWorkingDirectory(String directory) { boolean flag = true; try { flag = ftpClient.changeWorkingDirectory(directory); if (flag) { System.out.println("进入文件夹" + directory + " 成功！"); } else { System.out.println("进入文件夹" + directory + " 失败！开始创建文件夹"); } } catch (IOException ioe) { ioe.printStackTrace(); } return flag; } // 创建多层目录文件，如果有ftp服务器已存在该文件，则不创建，如果无，则创建 public boolean CreateDirecroty(String remote) throws IOException { boolean success = true; String directory = remote + "/"; // 如果远程目录不存在，则递归创建远程服务器目录 if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(new String(directory))) { int start = 0; int end = 0; if (directory.startsWith("/")) { start = 1; } else { start = 0; } end = directory.indexOf("/", start); String path = ""; String paths = ""; while (true) { String subDirectory = new String(remote.substring(start, end).getBytes("GBK"), "iso-8859-1"); path = path + "/" + subDirectory; if (!existFile(path)) { if (makeDirectory(subDirectory)) { changeWorkingDirectory(subDirectory); } else { System.out.println("创建目录[" + subDirectory + "]失败"); changeWorkingDirectory(subDirectory); } } else { changeWorkingDirectory(subDirectory); } paths = paths + "/" + subDirectory; start = end + 1; end = directory.indexOf("/", start); // 检查所有目录是否创建完毕 if (end <= start) { break; } } } return success; } // 判断ftp服务器文件是否存在 public boolean existFile(String path) throws IOException { boolean flag = false; FTPFile[] ftpFileArr = ftpClient.listFiles(path); if (null!= ftpFileArr&&ftpFileArr.length > 0) { flag = true; } return flag; } // 创建目录 public boolean makeDirectory(String dir) { boolean flag = true; try { flag = ftpClient.makeDirectory(dir); if (flag) { System.out.println("创建文件夹" + dir + " 成功！"); } else { System.out.println("创建文件夹" + dir + " 失败！"); } } catch (Exception e) { e.printStackTrace(); } return flag; } /** * * 下载文件 * * * @param pathname FTP服务器文件目录 * * @param filename 文件名称 * * @param localpath 下载后的文件路径 * * @return */ public boolean downloadFile(String pathname, String filename, String localpath, String hostname, Integer port, String username, String password) { boolean flag = false; OutputStream os = null; try { System.out.println("开始下载文件"); initFtpClient(hostname, port, username, password); // 切换FTP目录 ftpClient.changeWorkingDirectory(pathname); FTPFile[] ftpFiles = ftpClient.listFiles(); for (FTPFile file : ftpFiles) { if (filename.equalsIgnoreCase(file.getName())) { File localFile = new File(localpath + "/" + file.getName()); os = new FileOutputStream(localFile); ftpClient.retrieveFile(file.getName(), os); os.close(); } } ftpClient.logout(); flag = true; System.out.println("下载文件成功"); } catch (Exception e) { System.out.println("下载文件失败"); e.printStackTrace(); } finally { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } catch (IOException e) { e.printStackTrace(); } } if (null != os) { try { os.close(); } catch (IOException e) { e.printStackTrace(); } } } return flag; } /** * * 删除文件 * * * @param pathname FTP服务器保存目录 * * @param filename 要删除的文件名称 *