废话不多说，关键代码如下所示：
package com.eastrobot.remote; import java.util.List; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.eastrobot.util.PropertiesUtil; /** * full.zhang * * ftp/sftp抽象方法类 * */ public abstract class FileRemote { private static final String FTP_MODE = "ftp"; private static final String SFTP_MODE = "sftp"; public static String ftproot; public static String mode; public static String host; public static String username; public static String password; public static String port; private static FileRemote client = null; // 最大一次性下载50个文件 public static int max = 50; private final static Log LOGGER = LogFactory.getLog(FileRemote.class); public static FileRemote getInstance() { if (client == null) { ftproot = PropertiesUtil.getString("transfer.root"); mode = PropertiesUtil.getString("transfer.mode"); host = PropertiesUtil.getString("transfer.host"); username = PropertiesUtil.getString("transfer.username"); password = PropertiesUtil.getString("transfer.password"); port = PropertiesUtil.getString("transfer.port"); if (mode.equals(FTP_MODE)) { client = new FileFtpRemote(); } else if (mode.equals(SFTP_MODE)) { client = new FileSftpRemote(); } } return client; } /** * 执行定时任务 */ public void process() { LOGGER.debug("----------------------------------------进入定时下载远程文件"); // 创建线程池 ExecutorService exec = Executors.newSingleThreadExecutor(); exec.execute(new Runnable() { @Override public void run() { // 建立连接 initFtpInfo(host, port, username, password); // 远程服务所有源文件路径集合 List<String> listSourcePath = listRemoteFilePath(ftproot); if (listSourcePath.isEmpty()) { LOGGER.debug("____________________释放连接"); client.closeConnection(); return; } if (listSourcePath.size() > max) { listSourcePath = listSourcePath.subList(0, max); } for (String path : listSourcePath) { downloadRemoteFile(path); } LOGGER.debug("____________________释放连接"); client.closeConnection(); } }); exec.shutdown(); } /** * 初始化连接 * * @param host * @param port * @param username * @param password * @throws Exception * @return */ public abstract void initFtpInfo(String host, String port, String username, String password); /** * 下载远程服务下文件到本地服务 * * @param path * @return * @throws Exception */ public abstract void downloadRemoteFile(String filePath); /** * 获取远程服务下指定目录下的所有文件路径集合(包含子目录下文件) * * @param path * @return */ public abstract List<String> listRemoteFilePath(String path); /** * 释放连接 */ public abstract void closeConnection(); } [java] view plain copy package com.eastrobot.remote; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import org.apache.commons.io.IOUtils; import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.net.ftp.FTPReply; import com.eastrobot.command.Commander; public class FileFtpRemote extends FileRemote { protected FTPClient ftpClient; private String encoding = "UTF-8"; private boolean binaryTransfer = true; private final static Log LOGGER = LogFactory.getLog(FileFtpRemote.class); @Override public void initFtpInfo(String host, String port, String username, String password) { try { // 构造一个FtpClient实例 ftpClient = new FTPClient(); // 设置字符集 ftpClient.setControlEncoding(encoding); // 连接FTP服务器 ftpClient.connect(host, StringUtils.isNotBlank(port) ? Integer.valueOf(port) : 21); // 连接后检测返回码来校验连接是否成功 int reply = ftpClient.getReplyCode(); if (FTPReply.isPositiveCompletion(reply)) { // 登陆到ftp服务器 if (ftpClient.login(username, password)) { setFileType(); } ftpClient.login(username, password); } else { ftpClient.disconnect(); LOGGER.error("ftp服务拒绝连接!"); } } catch (Exception e) { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); // 断开连接 } catch (IOException e1) { LOGGER.error("ftp服务连接断开失败!"); } } LOGGER.error("ftp服务连接失败!"); } } /** * 设置文件传输类型 */ private void setFileType() { try { if (binaryTransfer) { ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); } else { ftpClient.setFileType(FTPClient.ASCII_FILE_TYPE); } } catch (IOException e) { e.printStackTrace(); } } @Override public void downloadRemoteFile(String filePath) { if (StringUtils.endsWith(filePath, "/") || StringUtils.endsWith(filePath, File.separator)) { filePath = filePath.substring(0, filePath.length() - 1); } File saveFile = new File(filePath); if (saveFile.exists()) { return; } // 文件所在目录 String path = filePath.substring(0, filePath.lastIndexOf("/")); if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } OutputStream output = null; try { // 创建目标文件路径 if (!saveFile.getParentFile().exists()) { saveFile.getParentFile().mkdirs(); } saveFile.createNewFile(); // 转移到FTP服务器目录 ftpClient.changeWorkingDirectory(path); output = new FileOutputStream(saveFile); ftpClient.retrieveFile(filePath, output); } catch (IOException e) { LOGGER.debug("文件:" + filePath + "______________________下载失败!"); e.printStackTrace(); } finally { LOGGER.debug("文件:" + filePath + "______________________下载成功!"); IOUtils.closeQuietly(output); } } @Override public List<String> listRemoteFilePath(String path) { List<String> list = new ArrayList<String>(); try { if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } boolean changedir = ftpClient.changeWorkingDirectory(path); if (changedir) { ftpClient.setControlEncoding(encoding); FTPFile[] files = ftpClient.listFiles(); for (FTPFile file : files) { if (list.size() >= max) { break; } if (file.isDirectory()) { if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } list.addAll(this.listRemoteFilePath(path + file.getName())); } else if (changedir) { if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } File saveFile = new File(path + file.getName()); if (!saveFile.exists()) { list.add(path + file.getName()); } } } } } catch (Exception e) { e.printStackTrace(); } return list; } @Override public void closeConnection() { if (ftpClient != null) { try { ftpClient.logout(); } catch (IOException e) { e.printStackTrace(); } finally { if (ftpClient.isConnected()) { try { ftpClient.disconnect(); } catch (IOException e) { e.printStackTrace(); } } } } } } [java] view plain copy package com.eastrobot.remote; import java.io.File; import java.io.FileOutputStream; import java.util.ArrayList; import java.util.List; import java.util.Properties; import java.util.Vector; import org.apache.commons.io.IOUtils; import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.eastrobot.command.Commander; import com.jcraft.jsch.Channel; import com.jcraft.jsch.ChannelSftp; import com.jcraft.jsch.JSch; import com.jcraft.jsch.Session; import com.jcraft.jsch.SftpATTRS; import com.jcraft.jsch.SftpException; import com.jcraft.jsch.ChannelSftp.LsEntry; public class FileSftpRemote extends FileRemote { protected Session session = null; protected ChannelSftp channel = null; private final static Log LOGGER = LogFactory.getLog(FileSftpRemote.class); @Override public void initFtpInfo(String host, String port, String username, String password) { try { JSch jsch = new JSch(); // 创建JSch对象 session = jsch.getSession(username, host, StringUtils.isNotBlank(port) ? Integer.valueOf(port) : 22); session.setPassword(password); // 设置密码 Properties config = new Properties(); config.put("StrictHostKeyChecking", "no"); session.setConfig(config); // 为Session对象设置properties session.setTimeout(60000); // 设置timeout时间 session.connect(); // 通过Session建立链接 Channel chan = session.openChannel("sftp"); // 打开SFTP通道 chan.connect(); // 建立SFTP通道的连接 channel = (ChannelSftp) chan; } catch (Exception e) { LOGGER.error("sftp连接失败"); e.printStackTrace(); } } @Override public void downloadRemoteFile(String filePath) { if (StringUtils.endsWith(filePath, "/") || StringUtils.endsWith(filePath, File.separator)) { filePath = filePath.substring(0, filePath.length() - 1); } File saveFile = new File(filePath); FileOutputStream output = null; try { if (saveFile.exists()) { return; } // 创建目标文件路径 if (!saveFile.getParentFile().exists()) { saveFile.getParentFile().mkdirs(); } saveFile.createNewFile(); // 文件所在目录 String path = filePath.substring(0, filePath.lastIndexOf("/")); if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } channel.cd(path); channel.get(filePath, new FileOutputStream(saveFile)); LOGGER.debug("文件：" + filePath + "____________________________________________下载成功!"); } catch (Exception e) { LOGGER.debug("文件：" + filePath + "____________________________________________下载失败!"); e.printStackTrace(); } finally { IOUtils.closeQuietly(output); } } @SuppressWarnings("unchecked") @Override public List<String> listRemoteFilePath(String path) { List<String> list = new ArrayList<String>(); Vector<LsEntry> v = null; try { if (!StringUtils.endsWith(path, "/") && StringUtils.endsWith(path, File.separator)) { path = path + File.separator; } v = channel.ls(path); } catch (SftpException e) { e.printStackTrace(); } for (LsEntry lsEntry : v) { if (list.size() >= max) { break; } if (!".".equals(lsEntry.getFilename()) && !"..".equals(lsEntry.getFilename())) { SftpATTRS attrs = lsEntry.getAttrs(); if (attrs.isDir()) { if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } list.addAll(this.listRemoteFilePath(path + lsEntry.getFilename())); } else { if (!StringUtils.endsWith(path, "/") && !StringUtils.endsWith(path, File.separator)) { if (Commander.isLinux) { path = path + File.separator; } else { path = path + "/"; } } File saveFile = new File(path + lsEntry.getFilename()); if (!saveFile.exists()) { list.add(path + lsEntry.getFilename()); } } } } return list; } @Override public void closeConnection() { try { if (channel != null) { channel.quit(); channel.disconnect(); } if (session != null) { session.disconnect(); } } catch (Exception e) { e.printStackTrace(); } } public Session getSession() { return session; } public void setSession(Session session) { this.session = session; } public ChannelSftp getChannel() { return channel; } public void setChannel(ChannelSftp channel) { this.channel = channel; } }
以上所述是小编给大家介绍的sftp和ftp 根据配置远程服务器地址下载文件到当前服务，希望对大家有所帮助，如果大家有任何疑问请给我们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！
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