使用JSch在Java中进行文件/目录同步？
是否可以使用JSch在Java中进行文件/目录同步？ 我需要将目录从远程linux机器同步到我的本地Windows机器。 这可能吗 ？
-Tivakar
从SCP服务器下载文件的最简单方法是使用Commons VFS和JSch：
import java.io.*; import org.apache.commons.io.FileUtils; import org.apache.commons.vfs2.*; public class CopyRemoteFile { public static void copyRemoteFiles(String host, String user, String remotePath, String localPath) throws IOException { FileSystemOptions fsOptions = new FileSystemOptions(); SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(fsOptions, "no"); SftpFileSystemConfigBuilder.getInstance().setIdentities(fsOptions, new File[] { new File(FileUtils.getUserDirectoryPath() + "/.ssh/id_dsa") }); DefaultFileSystemManager fsManager = (DefaultFileSystemManager) VFS.getManager(); String uri = "sftp://" + user + "@" + host + "/" + remotePath; FileObject fo = fsManager.resolveFile(uri, fsOptions); FileObject[] files = fo.getChildren(); for (FileObject file : files) { // We will be dealing with the files here only if (file.getType() == FileType.FILE) { FileUtils.copyInputStreamToFile(file.getContent().getInputStream(), new File(localPath + "/" + file.getName().getBaseName())); } file.close(); } fo.close(); fsManager.close(); } } 这只是我在我的Wiki中的一个例子，所以没什么特别的。 但请记住，如果您关闭fsManager ，您将无法在同一个VM中再次打开它。 我在测试此解决方案时遇到了这个问题……
虽然上面的示例没有导入任何JSch类，但是无论如何都需要将它放在类路径中。
上面的示例使用私钥对远程主机进行身份validation。 您可以通过提供密码和修改uri来轻松更改它。
如果需要同步文件，可以比较本地文件系统（或DB，或任何其他信息源）和远程文件上的文件日期：
import java.io.*; import org.apache.commons.io.*; import org.apache.commons.vfs2.*; import org.apache.commons.vfs2.impl.*; import org.apache.commons.vfs2.provider.sftp.*; public class CopyRemoteFile { public static void copyRemoteFiles(final String host, final String user, final String remotePath, final String localPath) throws IOException { FileSystemOptions fsOptions = new FileSystemOptions(); SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(fsOptions, "no"); SftpFileSystemConfigBuilder.getInstance().setIdentities(fsOptions, new File[] { new File(FileUtils.getUserDirectoryPath() + "/.ssh/id_dsa") }); DefaultFileSystemManager fsManager = (DefaultFileSystemManager) VFS.getManager(); String uri = "sftp://" + user + "@" + host + "/" + remotePath; FileObject fo = fsManager.resolveFile(uri, fsOptions); FileObject[] files = fo.getChildren(); for (FileObject file : files) { // We will be dealing with the files here only File newFile = new File(localPath + "/" + file.getName().getBaseName()); if (file.getType() == FileType.FILE && newFile.lastModified() != file.getContent().getLastModifiedTime()) { FileUtils.copyInputStreamToFile(file.getContent().getInputStream(), newFile); newFile.setLastModified(file.getContent().getLastModifiedTime()); } file.close(); } fo.close(); fsManager.close(); } }
请看： http ： //the-project.net16.net/Projekte/projekte/Projekte/Programmieren/sftp-synchronisierung.html
有一个完整的程序uploadet。 这是同步部分：
import java.io.File; import java.io.FileNotFoundException; import java.util.ArrayList; import java.util.Vector; import com.jcraft.jsch.ChannelSftp.LsEntry; import com.jcraft.jsch.SftpException; /* * This is the heart of the whole Program. I hope, the descriptions are precise enought. */ public class Sync{ public String ServerPath; public File LocalFolder; public sFTPclient client; public ArrayList serverContentList; public ArrayList pathList; public Sync(File local, String to, sFTPclient client){ this.LocalFolder = local; this.ServerPath = to; this.client = client; } /* * Executed once. Sets the Server Directory if it exists. * If the local folder doesn't exist on the Server, it creates it. */ public void setServerDirectory() throws SftpException{ try{ client.sftpChannel.cd(ServerPath); }catch(Exception e){ GUI.addToConsole(ServerPath + " don't exist on your server!"); } String serverFolder = ServerPath.substring(ServerPath.lastIndexOf('/')+1, ServerPath.length()); if(!LocalFolder.getName().equals(serverFolder)){ try{ client.sftpChannel.mkdir(LocalFolder.getName()); client.sftpChannel.cd(LocalFolder.getName()); } catch (Exception e){ client.sftpChannel.cd(LocalFolder.getName()); } this.ServerPath = ServerPath + "/" + LocalFolder.getName(); GUI.setNewServerFolder(ServerPath); } serverContentList = new ArrayList (); pathList = new ArrayList (); } //The contentlist contains all Filenames, that should be synchronized public void setToContentList(String ServerFolder) throws SftpException{ @SuppressWarnings("unchecked") Vector fileList = client.sftpChannel.ls(ServerFolder); int size = fileList.size(); for(int i = 0; i < size; i++){ if(!fileList.get(i).getFilename().startsWith(".")){ serverContentList.add(fileList.get(i).getFilename()); pathList.add(ServerFolder); } } } /* * Deletes the synchronized elements from the Lists */ public void deleteFromLists(String name){ int position = serverContentList.lastIndexOf(name); if(position >= 0){ serverContentList.remove(position); pathList.remove(position); } } /* * Main function for synchronizing. Works recursive for local folders. */ @SuppressWarnings("unchecked") public void synchronize(File localFolder, String ServerDir) throws SftpException, FileNotFoundException{ if(client.sftpChannel.pwd() != ServerDir){ client.sftpChannel.cd(ServerDir); } setToContentList(ServerDir); File[] localList = localFolder.listFiles(); Vector ServerList = client.sftpChannel.ls(ServerDir); ServerList.remove(0); ServerList.remove(0); /* * Upload missing Files/Folders */ int size = localList.length; for(int i = 0; i < size; i++){ if(localList[i].isDirectory()){ if(checkFolder(localList[i], ServerDir)){ synchronize(localList[i], ServerDir + "/" + localList[i].getName()); deleteFromLists("SubFolder"); }else { newFileMaster(true, localList[i], ServerDir); } } else { checkFile(localList[i], ServerDir); } deleteFromLists(localList[i].getName()); } } /* * Deletes all files on the server, which are not in the local Folder. Deletes also all missing folders */ public void deleteRest() throws SftpException, FileNotFoundException{ int size = serverContentList.size(); for(int i = 0; i < size; i++){ client.sftpChannel.cd(pathList.get(i)); newFileMaster(false, null, serverContentList.get(i)); } } /* * Copy or delete Files/Folders */ public void newFileMaster(boolean copyOrNot, File sourcePath, String destPath) throws FileNotFoundException, SftpException{ FileMaster copy = new FileMaster(copyOrNot, sourcePath, destPath, client.sftpChannel); copy.runMaster(); } /* *Useful to find errors - Prints out the content-List every time you call the method. *If you have Problems, call it before and after every changes of the serverContentList! */ /*public void printServerContent(){ System.out.println("SERVER-Content: " + "\n"); for(int i = 0; i < serverContentList.size(); i++){ System.out.println(serverContentList.get(i) + " in " + pathList.get(i)); } }*/ /* * Looks ond the server, if the file is there. If not, or the local file has changed, it copies the file on the server. */ public void checkFile(File file, String path) throws SftpException, FileNotFoundException{ client.sftpChannel.cd(path); if(!serverContentList.contains(file.getName())){ newFileMaster(true, file, ServerPath); } else { Long localTimeStamp = file.lastModified(); Long timeStamp = client.sftpChannel.stat(file.getName()).getATime()*1000L; if(localTimeStamp > timeStamp){ newFileMaster(false, null, path + "/" + file.getName()); newFileMaster(true, file, path); } } deleteFromLists(file.getName()); } /* * The same as the checkFile function. But it returns a boolean. (Easier to handle in the synchronized funtion) * Don't check, if the folder has changed (I think this can't be the case) */ public boolean checkFolder(File folder, String path) throws SftpException{ client.sftpChannel.cd(path); if(serverContentList.contains(folder.getName())){ return true; }else { return false; } } }