upload and download files from ftp server using servlet

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December 29, 2008 at 3:59 AM

Mr............

i don't know where r u fencing problem but i converted your source code in servlet. It may help to solve your problem.......

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.commons.net.ftp.*;

public class FTPServerConnection extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<html>");
pw.println("<head><title>Hello FTP Server</title></title>");
pw.println("<body>");
pw.println("<h1>Hello FTP Server</h1>");
pw.println("</body></html>");
try{
String ftpHost = "localhost";
String ftpUserName = "admin";
String ftpPassword = "admin";
//String ftpHost = "192.168.0.144";
//String ftpUserName = "rootadmin";
//String ftpPassword = "rootadmin";
String ftpRemoteDirectory = "/Ah Kyi Ta Chat";
String fileToTransmit = "C:\\my.ini";

FTPClient ftp = new FTPClient();
int reply;

ftp.connect(ftpHost);
reply = ftp.getReplyCode();
System.out.println("Reply:"+reply);
System.out.println("FTP Reply:"+FTPReply.isPositiveCompletion(reply));

if(!FTPReply.isPositiveCompletion(reply)) {
try {
ftp.disconnect();
} catch (Exception e) {
System.err.println("Unable to disconnect from FTP server " + "after server refused connection. "+e.toString());
} throw new Exception ("FTP server refused connection.");
}

-----------------------------------------------------------

December 29, 2008 at 4:00 AM

System.out.println("Connected to " + ftpHost + ". "+ftp.getReplyString());

System.out.println("User Name:"+ftpUserName+",Password:"+ftpPassword);
if (!ftp.login(ftpUserName, ftpPassword)) {
throw new Exception ("Unable to login to FTP server " + "using username "+ftpUserName+" " + "and password "+ftpPassword);
}
System.out.println(ftp.getReplyString());
System.out.println("Login Successful.");
System.out.println("Remote system is " + ftp.getSystemName());

ftp.setFileType(FTP.BINARY_FILE_TYPE);

if (ftpRemoteDirectory != null && ftpRemoteDirectory.trim().length() > 0) {
System.out.println("Changing to FTP remote dir: " + ftpRemoteDirectory);
ftp.changeWorkingDirectory(ftpRemoteDirectory);
reply = ftp.getReplyCode();
System.out.println("Change dir Okay:");
System.out.println("Reply Code:"+reply);
if(!FTPReply.isPositiveCompletion(reply)) {
throw new Exception ("Unable to change working 5 " + "to:"+ftpRemoteDirectory);
}
}

System.out.println("File Directory:"+fileToTransmit);
File f = new File(fileToTransmit);
System.out.println("Storing file as remote filename: " + f.getName());
boolean retValue = ftp.storeFile(f.getName(), new FileInputStream(f));
if (!retValue) {
throw new Exception ("Storing of remote file failed. ftp.storeFile()" + " returned false.");
}
System.out.println("File uploaded successful.");

/* String fileNames[]=ftp.listNames();
for(int i=0;i<fileNames.length;i++){
System.out.println("Files names:"+fileNames[i]);
}*/
FTPFile files[] = ftp.listFiles();
reply = ftp.getReplyCode();
System.out.println("File length:"+files.length);
if(!FTPReply.isPositiveCompletion(reply)) {
throw new Exception ("Unable to get list of files to dowload.");
}

if (files.length == 0) {
System.out.println("No files are available for download.");
} else {
for (int i=0; i<files.length; i++) {
System.out.println("Downloading file "+files[i].getName()+" Size:"+files[i].getSize());
String outputFileName = "c:\\temp\\"+files[i].getName();
f = new File(outputFileName);
retValue = ftp.retrieveFile(files[i].getName(), new FileOutputStream(f));
if (!retValue) {
throw new Exception ("Downloading of remote file "+files[i].getName()+" failed. ftp.retrieveFile() returned false.");
}

/*
retValue = ftp.deleteFile(files[i].getName());
if (!retValue) {
log.error ("Unable to delete remote file "+files[i].getName()+". ftp.deleteFile() returned false.");
}
*/
}
}

try {
//ftp.logout();
ftp.disconnect();
} catch (Exception exc) {
System.err.println("Unable to disconnect from FTP server. " + exc.toString());
}
} catch (Exception e) {
System.err.println("Error: "+e.toString());
}
System.out.println("Process Complete.");
System.exit(0);
}
}

Thanks.........