Java连接服务器的两种方式SFTP和FTP

 commons-netcommons-net3.6

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; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; import java.io.*; @Component public class FtpUtil { private static final Logger logger = LoggerFactory.getLogger(FtpUtil.class); //ftp服务器地址 @Value("${ftp.server}") private String hostname; //ftp服务器端口 @Value("${ftp.port}") private int port; //ftp登录账号 @Value("${ftp.userName}") private String username; //ftp登录密码 @Value("${ftp.userPassword}") private String password; /** * 初始化FTP服务器 * * @return */ public FTPClient getFtpClient() { FTPClient ftpClient = new FTPClient(); ftpClient.setControlEncoding("UTF-8"); try { //设置连接超时时间 ftpClient.setDataTimeout(1000 * 120); logger.info("连接FTP服务器中:" + hostname + ":" + port); //连接ftp服务器 ftpClient.connect(hostname, port); //登录ftp服务器 ftpClient.login(username, password); // 是否成功登录服务器 int replyCode = ftpClient.getReplyCode(); if (FTPReply.isPositiveCompletion(replyCode)) { logger.info("连接FTP服务器成功:" + hostname + ":" + port); } else { logger.error("连接FTP服务器失败:" + hostname + ":" + port); closeFtpClient(ftpClient); } } catch (IOException e) { logger.error("连接ftp服务器异常", e); } return ftpClient; } /** * 上传文件 * * @param pathName    路径 * @param fileName    文件名 * @param inputStream 输入文件流 * @return */ public boolean uploadFileToFtp(String pathName, String fileName, InputStream inputStream) { boolean isSuccess = false; FTPClient ftpClient = getFtpClient(); try { if (ftpClient.isConnected()) { logger.info("开始上传文件到FTP,文件名称:" + fileName); //设置上传文件类型为二进制，否则将无法打开文件 ftpClient.setFileType(FTP.BINARY_FILE_TYPE); //路径切换，如果目录不存在创建目录 if (!ftpClient.changeWorkingDirectory(pathName)) { boolean flag = this.changeAndMakeWorkingDir(ftpClient, pathName); if (!flag) { logger.error("路径切换(创建目录)失败"); return false; } } //设置被动模式，文件传输端口设置(如上传文件夹成功，不能上传文件，注释这行，否则报错refused:connect) ftpClient.enterLocalPassiveMode(); ftpClient.storeFile(fileName, inputStream); inputStream.close(); ftpClient.logout(); isSuccess = true; logger.info(fileName + "文件上传到FTP成功"); } else { logger.error("FTP连接建立失败"); } } catch (Exception e) { logger.error(fileName + "文件上传异常", e); } finally { closeFtpClient(ftpClient); closeStream(inputStream); } return isSuccess; } /** * 删除文件 * * @param pathName 路径 * @param fileName 文件名 * @return */ public boolean deleteFile(String pathName, String fileName) { boolean flag = false; FTPClient ftpClient = getFtpClient(); try { logger.info("开始删除文件"); if (ftpClient.isConnected()) { //路径切换 ftpClient.changeWorkingDirectory(pathName); ftpClient.enterLocalPassiveMode(); ftpClient.dele(fileName); ftpClient.logout(); flag = true; logger.info("删除文件成功"); } else { logger.info("删除文件失败"); } } catch (Exception e) { logger.error(fileName + "文件删除异常", e); } finally { closeFtpClient(ftpClient); } return flag; } /** * 关闭FTP连接 * * @param ftpClient */ public void closeFtpClient(FTPClient ftpClient) { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } catch (IOException e) { logger.error("关闭FTP连接异常", e); } } } /** * 关闭文件流 * * @param closeable */ public void closeStream(Closeable closeable) { if (null != closeable) { try { closeable.close(); } catch (IOException e) { logger.error("关闭文件流异常", e); } } } /** * 路径切换（没有则创建） * * @param ftpClient FTP服务器 * @param path      路径 */ public void changeAndMakeWorkingDir(FTPClient ftpClient, String path) { boolean flag = false; try { String[] path_array = path.split("/"); for (String s : path_array) { boolean b = ftpClient.changeWorkingDirectory(s); if (!b) { ftpClient.makeDirectory(s); ftpClient.changeWorkingDirectory(s); } } flag = true; } catch (IOException e) { logger.error("路径切换异常", e); } return flag; } /** * 从FTP下载到本地文件夹 * * @param ftpClient      FTP服务器 * @param pathName       路径 * @param targetFileName 文件名 * @param localPath      本地路径 * @return */ public boolean downloadFile(FTPClient ftpClient, String pathName, String targetFileName, String localPath) { boolean flag = false; OutputStream os = null; try { System.out.println("开始下载文件"); //切换FTP目录 ftpClient.changeWorkingDirectory(pathName); ftpClient.enterLocalPassiveMode(); FTPFile[] ftpFiles = ftpClient.listFiles(); for (FTPFile file : ftpFiles) { String ftpFileName = file.getName(); if (targetFileName.equalsIgnoreCase(ftpFileName)) { File localFile = new File(localPath + targetFileName); os = new FileOutputStream(localFile); ftpClient.retrieveFile(file.getName(), os); os.close(); } } ftpClient.logout(); flag = true; logger.info("下载文件成功"); } catch (Exception e) { logger.error("下载文件失败", e); } finally { closeFtpClient(ftpClient); closeStream(os); } return flag; } }

 com.jcraftjsch0.1.54

import com.jcraft.jsch.*; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.util.Properties; import java.util.Vector; @Component public class SFTPUtil { private static final Logger logger = LoggerFactory.getLogger(SFTPUtil.class); private Session session = null; private ChannelSftp channel = null; private int timeout = 60000; /** * 连接sftp服务器 */ public boolean connect(String ftpUsername, String ftpAddress, int ftpPort, String ftpPassword) { boolean isSuccess = false; if (channel != null) { System.out.println("通道不为空"); return false; } //创建JSch对象 JSch jSch = new JSch(); try { // 根据用户名，主机ip和端口获取一个Session对象 session = jSch.getSession(ftpUsername, ftpAddress, ftpPort); //设置密码 session.setPassword(ftpPassword); Properties config = new Properties(); config.put("StrictHostKeyChecking", "no"); //为Session对象设置properties session.setConfig(config); //设置超时 session.setTimeout(timeout); //通过Session建立连接 session.connect(); System.out.println("Session连接成功"); // 打开SFTP通道 channel = (ChannelSftp) session.openChannel("sftp"); // 建立SFTP通道的连接 channel.connect(); System.out.println("通道连接成功"); isSuccess = true; } catch (JSchException e) { logger.error("连接服务器异常", e); } return isSuccess; } /** * 关闭连接 */ public void close() { //操作完毕后，关闭通道并退出本次会话 if (channel != null && channel.isConnected()) { channel.disconnect(); } if (session != null && session.isConnected()) { session.disconnect(); } } /** * 文件上传 * 采用默认的传输模式：OVERWRITE * @param src      输入流 * @param dst      上传路径 * @param fileName 上传文件名 * * @throws SftpException */ public boolean upLoadFile(InputStream src, String dst, String fileName) throws SftpException { boolean isSuccess = false; try { if(createDir(dst)) { channel.put(src, fileName); isSuccess = true; } } catch (SftpException e) { logger.error(fileName + "文件上传异常", e); } return isSuccess; } /** * 创建一个文件目录 * * @param createpath  路径 * @return */ public boolean createDir(String createpath) { boolean isSuccess = false; try { if (isDirExist(createpath)) { channel.cd(createpath); return true; } String pathArry[] = createpath.split("/"); StringBuffer filePath = new StringBuffer("/"); for (String path : pathArry) { if (path.equals("")) { continue; } filePath.append(path + "/"); if (isDirExist(filePath.toString())) { channel.cd(filePath.toString()); } else { // 建立目录 channel.mkdir(filePath.toString()); // 进入并设置为当前目录 channel.cd(filePath.toString()); } } channel.cd(createpath); isSuccess = true; } catch (SftpException e) { logger.error("目录创建异常！", e); } return isSuccess; } /** * 判断目录是否存在 * @param directory     路径 * @return */ public boolean isDirExist(String directory) { boolean isSuccess = false; try { SftpATTRS sftpATTRS = channel.lstat(directory); isSuccess = true; return sftpATTRS.isDir(); } catch (Exception e) { if (e.getMessage().toLowerCase().equals("no such file")) { isSuccess = false; } } return isSuccess; } /** * 重命名指定文件或目录 * */ public boolean rename(String oldPath, String newPath) { boolean isSuccess = false; try { channel.rename(oldPath, newPath); isSuccess = true; } catch (SftpException e) { logger.error("重命名指定文件或目录异常", e); } return isSuccess; } /** * 列出指定目录下的所有文件和子目录。 */ public Vector ls(String path) { try { Vector vector = channel.ls(path); return vector; } catch (SftpException e) { logger.error("列出指定目录下的所有文件和子目录。", e); } return null; } /** * 删除文件 * * @param directory  linux服务器文件地址 * @param deleteFile 文件名称 */ public boolean deleteFile(String directory, String deleteFile) { boolean isSuccess = false; try { channel.cd(directory); channel.rm(deleteFile); isSuccess = true; } catch (SftpException e) { logger.error("删除文件失败", e); } return isSuccess; } /** * 下载文件 * * @param directory    下载目录 * @param downloadFile 下载的文件 * @param saveFile     下载到本地路径 */ public boolean download(String directory, String downloadFile, String saveFile) { boolean isSuccess = false; try { channel.cd(directory); File file = new File(saveFile); channel.get(downloadFile, new FileOutputStream(file)); isSuccess = true; } catch (SftpException e) { logger.error("下载文件失败", e); } catch (FileNotFoundException e) { logger.error("下载文件失败", e); } return isSuccess; } }