问题
My problem is need to transfer files from one remote server to another remote server (may be FTP/SFTP) but there is no direct method to transfer files from one remote server to another.
That's why I am downloading files from server to local temp. After uploading to local to another server. After uploading I need to remove local temp folder but the files and the folder is not deleted.
Can you please help us in this regard?
My code is
package FTPTransfer;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.File;
import java.util.Calendar;
import org.apache.commons.net.PrintCommandListener;
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 com.jcraft.jsch.*;
public class FtpToSftp
{
JSch sftp=null;
ChannelSftp channelSftp=null;
Channel channel=null;
FTPClient ftp = null;
Session session=null;
String SFTP_ROOT="/Mahesh/";
String FTP_ROOT="/Mahesh/";
String Local_Dir="./Temp/";
int count=0;
public void ftpconnect(String host, String user, String pwd) throws Exception{
ftp = new FTPClient();
ftp.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
int reply;
ftp.connect(host);
if(ftp.isConnected())
System.out.println("FTP Connected");
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
throw new Exception("Exception in connecting to FTP Server");
}
ftp.login(user, pwd);
ftp.setFileType(FTP.BINARY_FILE_TYPE);
ftp.enterLocalPassiveMode();
}
public void sftpconnect(String host, String user, String pwd) throws Exception{
sftp=new JSch();
session=sftp.getSession(user,host,22);
session.setPassword(pwd);
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
if(session.isConnected())
System.out.println("SFTP Session Connected");
channel = session.openChannel("sftp");
channel.connect();
if(channel.isConnected())
System.out.println("SFTP Channel Connected");
channelSftp=(ChannelSftp)channel;
}
public void downloadFromFTP()throws Exception {
File f=new File(Local_Dir);
if(!f.exists())
f.mkdir();
FTPFile[] files = ftp.listFiles(FTP_ROOT);
count=0;
OutputStream outputStream=null;
for (FTPFile fname : files) {
if (fname.getType() == FTPFile.FILE_TYPE) {
System.out.println(fname.getName());
File downloadFile = new File(Local_Dir+ fname.getName());
outputStream = new BufferedOutputStream(new FileOutputStream(downloadFile));
boolean success = ftp.retrieveFile(FTP_ROOT+fname.getName(), outputStream);
if(success)
count++;
else
downloadFile.delete();
}
}
if(count==files.length)
System.out.println("Files Downloaded Successfully");
System.out.println("count:"+count+"files length:"+files.length);
outputStream.close();
}
public void uploadToSFTP() throws Exception{
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH)+1;//0 based
String foldername=month+""+year+"/";
String fullDirPath=SFTP_ROOT+foldername;
SftpATTRS attrs=null;
try{
attrs=channelSftp.lstat(fullDirPath);
}
catch(Exception e){
}
if(attrs==null)
{
channelSftp.mkdir(fullDirPath);
channelSftp.cd(fullDirPath);
}
count=0;
File f1 = new File(Local_Dir);
File list[] = f1.listFiles();
for(File fname : list) {
System.out.println(fname);
channelSftp.put(fname+"", fullDirPath+fname.getName(), ChannelSftp.OVERWRITE);
}
if(count==f1.length())
System.out.println("Files Uploaded Successfully");
}
public FtpToSftp() throws Exception{
System.out.println("Connecting to FTP");
ftpconnect("10.219.28.110", "webteam", "web$123");
System.out.println("Connecting to SFTP");
sftpconnect("10.219.29.61","root" , "leo$123");
downloadFromFTP();
if(ftp.logout()){
ftp.disconnect();
System.out.println("FTP connection closed");
}
uploadToSFTP();
channelSftp.disconnect();
}
public static final void main(String[] args)
{
try{
FtpToSftp fs=new FtpToSftp();
File file=new File(fs.Local_Dir);
if(file.isDirectory())
{
File[] files = file.listFiles();
for (File f : files)
{
String fname=f.getName();
boolean success=f.delete();
if(success)
System.out.println(fname+" file deleted from local");
}
}
if(file.delete())
System.out.println("Temp folder deleted from local");
}
catch(Exception e){
e.printStackTrace();
}
} // end main
}
回答1:
You can use Apache FTPClient to do this and all other common commands needed with FTP.
Example to delete a folder:
FTPClient client = new FTPClient();
client.connect(host, port);
client.login(loginname, password);
client.removeDirectory(directoryPathOnServer);
client.disconnect();
回答2:
Here is a code snippet that deletes all the contents of the directory and the directory itself..
private void deleteDirectory(String path,FTPClient ftpClient) throws Exception{
FTPFile[] files=ftpClient.listFiles(path);
if(files.length>0) {
for (FTPFile ftpFile : files) {
if(ftpFile.isDirectory()){
logger.info("trying to delete directory "+path + "/" + ftpFile.getName());
deleteDirectory(path + "/" + ftpFile.getName(), ftpClient);
}
else {
String deleteFilePath = path + "/" + ftpFile.getName();
logger.info("deleting file {}", deleteFilePath);
ftpClient.deleteFile(deleteFilePath);
}
}
}
logger.info("deleting directory "+path);
ftpClient.removeDirectory(path);
}
回答3:
If you want to delete an directory in your system
This is an part of example:
File x=new File("C:\Users\satyamahesh\folder");
String[]entries = x.list();
for(String s: entries){
File currentFile = new File(x.getPath(), s);
currentFile.delete();
}
Then your folder is deleted.
If you want test it success or don't success to download a folder
Please test Ad Fundum's answer.
回答4:
Example to delete a folder: (@SatyaMahesh In this part your code is incorrect and this code used NIO is correct.):
File downloadFile = new File(Local_Dir+ fname.getName());
outputStream = new BufferedOutputStream(new FileOutputStream(downloadFile));
boolean success = ftp.retrieveFile(FTP_ROOT+fname.getName(), outputStream);
if(success)
count++;
else{
Path path = Paths.get("data/subdir/logging-moved.properties");
try {
Files.delete(path);
} catch (IOException e) {
//deleting file failed
e.printStackTrace();
}
}
Then your folder is deleted.
来源：https://stackoverflow.com/questions/23768703/how-to-delete-directory-using-java-after-uploading-files-to-remote-server