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
答案 0 :(得分：2)
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，但无论如何都需要将它放在类路径中。
以上示例使用私钥对远程主机进行身份验证。您可以通过提供密码和修改uri来轻松更改它。
如果您需要同步文件，您可以比较本地文件系统（或数据库或任何其他信息源）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();
}
}
答案 1 :(得分：-1)
请注意：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<String> serverContentList;
public ArrayList<String> 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<String>();
pathList = new ArrayList<String>();
}
//The contentlist contains all Filenames, that should be synchronized
public void setToContentList(String ServerFolder) throws SftpException{
@SuppressWarnings("unchecked")
Vector<LsEntry> 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<LsEntry> 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; }
}
}