Ftp client demonstration : Ftp « Network Protocol « Java
Ftp client demonstration
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.StringTokenizer;
import sun.net.TelnetInputStream;
import sun.net.ftp.FtpClient;
public class FtpClientDemo {
public static int BUFFER_SIZE = 10240;
private FtpClient m_client;
// set the values for your server
private String host = "";
private String user = "";
private String password = "";
private String sDir = "";
private String m_sLocalFile = "";
private String m_sHostFile = "";
public FtpClientDemo() {
try {
System.out.println("Connecting to host " + host);
m_client = new FtpClient(host);
m_client.login(user, password);
System.out.println("User " + user + " login OK");
System.out.println(m_client.welcomeMsg);
m_client.cd(sDir);
System.out.println("Directory: " + sDir);
m_client.binary();
System.out.println("Success.");
} catch (Exception ex) {
System.out.println("Error: " + ex.toString());
}
}
protected void disconnect() {
if (m_client != null) {
try {
m_client.closeServer();
} catch (IOException ex) {
}
m_client = null;
}
}
public static int getFileSize(FtpClient client, String fileName)
throws IOException {
TelnetInputStream lst = client.list();
String str = "";
fileName = fileName.toLowerCase();
while (true) {
int c = lst.read();
char ch = (char) c;
if (c < 0 || ch == '\n') {
str = str.toLowerCase();
if (str.indexOf(fileName) >= 0) {
StringTokenizer tk = new StringTokenizer(str);
int index = 0;
while (tk.hasMoreTokens()) {
String token = tk.nextToken();
if (index == 4)
try {
return Integer.parseInt(token);
} catch (NumberFormatException ex) {
return -1;
}
index++;
}
}
str = "";
}
if (c <= 0)
break;
str += ch;
}
return -1;
}
protected void getFile() {
if (m_sLocalFile.length() == 0) {
m_sLocalFile = m_sHostFile;
}
byte[] buffer = new byte[BUFFER_SIZE];
try {
int size = getFileSize(m_client, m_sHostFile);
if (size > 0) {
System.out.println("File " + m_sHostFile + ": " + size
+ " bytes");
System.out.println(size);
} else
System.out.println("File " + m_sHostFile + ": size unknown");
FileOutputStream out = new FileOutputStream(m_sLocalFile);
InputStream in = m_client.get(m_sHostFile);
int counter = 0;
while (true) {
int bytes = in.read(buffer);
if (bytes < 0)
break;
out.write(buffer, 0, bytes);
counter += bytes;
}
out.close();
in.close();
} catch (Exception ex) {
System.out.println("Error: " + ex.toString());
}
}
protected void putFile() {
if (m_sLocalFile.length() == 0) {
System.out.println("Please enter file name");
}
byte[] buffer = new byte[BUFFER_SIZE];
try {
File f = new File(m_sLocalFile);
int size = (int) f.length();
System.out.println("File " + m_sLocalFile + ": " + size + " bytes");
System.out.println(size);
FileInputStream in = new FileInputStream(m_sLocalFile);
OutputStream out = m_client.put(m_sHostFile);
int counter = 0;
while (true) {
int bytes = in.read(buffer);
if (bytes < 0)
break;
out.write(buffer, 0, bytes);
counter += bytes;
System.out.println(counter);
}
out.close();
in.close();
} catch (Exception ex) {
System.out.println("Error: " + ex.toString());
}
}
public static void main(String argv[]) {
new FtpClientDemo();
}
}
