The below java code will help us to Download/Upload files from/To FTP server.
import java.io.*;
import java.net.*;
public class FTPClient {
public final String host;
public final String user;
protected final String password;
protected URLConnection ftpurl;
public FTPClient(String host, String user, String password) {
this.host = host;
this.user = user;
this.password = password;
this.ftpurl = null;
}
private URL createURL(String destfile) throws MalformedURLException {
if (user == null)
return new URL("ftp://" + host + "/" + destfile + ";type=i");
else
return new URL("ftp://" + user + ":" + password + "@" + host +"/" + destfile + ";type=i");
}
protected InputStream openDownloadStream(String destfile) throws Exception {
URL url = createURL(destfile);
ftpurl = url.openConnection();
InputStream is = ftpurl.getInputStream();
return is;
}
protected OutputStream openUploadStream(String targetfile) throws Exception {
URL url = createURL(targetfile);
ftpurl = url.openConnection();
OutputStream os = ftpurl.getOutputStream();
return os;
}
protected void close() {
ftpurl = null;
}
public void Upload(String sourcefile, String destfile) {
try {
OutputStream os = openUploadStream(destfile);
FileInputStream is = new FileInputStream(sourcefile);
byte[] buf = new byte[33554432];
int c;
while (true) {
c = is.read(buf);
if (c <= 0)
break;
os.write(buf, 0, c);
}
os.close();
is.close();
close();
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
}
public void Download(String sourcefile, String destfile) {
try {
InputStream is = openDownloadStream(destfile);
FileOutputStream os = new FileOutputStream(sourcefile);
byte[] buf = new byte[41943040];//Buffer size set to 40 MB ,change based on the file size
int c;
while (true) {
c = is.read(buf);
if (c <= 0)
break;
os.write(buf, 0, c);
}
is.close();
os.close();
close();
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
}
}
