FTP upload and download in Java program

The Ftplist section is used to display files on the FTP server, Getbutton part is to pass a file from the FTP server, and Putbutton to upload a file to the FTP server.

Don't forget to introduce two library files (importsun.net.*,import sun.net.ftp.*) in your program.

The following are the Java source programs for these three sections:

(1) Displaying files on the FTP server

void ftpList_actionPerformed(ActionEvent e) {
String server=serverEdit.getText();
//输入的FTP服务器的IP地址
String user=userEdit.getText();
//登录FTP服务器的用户名
String password=passwordEdit.getText();
//登录FTP服务器的用户名的口令
String path=pathEdit.getText();
//FTP服务器上的路径
try {
FtpClient ftpClient=new FtpClient();
//创建FtpClient对象
ftpClient.openServer(server);
//连接FTP服务器
ftpClient.login(user, password);
//登录FTP服务器
if (path.length()!=0) ftpClient.cd(path);
TelnetInputStream is=ftpClient.list();
int c;
while ((c=is.read())!=-1) {
System.out.print((char) c);}
is.close();
ftpClient.closeServer();//退出FTP服务器
} catch (IOException ex) {;}
}

(2) from the FTP server to send a file up and down

void getButton_actionPerformed(ActionEvent e) {
String server=serverEdit.getText();
String user=userEdit.getText();
String password=passwordEdit.getText();
String path=pathEdit.getText();
String filename=filenameEdit.getText();
try {
FtpClient ftpClient=new FtpClient();
ftpClient.openServer(server);
ftpClient.login(user, password);
if (path.length()!=0) ftpClient.cd(path);
ftpClient.binary();
TelnetInputStream is=ftpClient.get(filename);
File file_out=new File(filename);
FileOutputStream os=new
FileOutputStream(file_out);
byte[] bytes=new byte[1024];
int c;
while ((c=is.read(bytes))!=-1) {
os.write(bytes,0,c);
}
is.close();
os.close();
ftpClient.closeServer();
} catch (IOException ex) {;}
}

(3) Upload a file to the FTP server

void putButton_actionPerformed(ActionEvent e) {
String server=serverEdit.getText();
String user=userEdit.getText();
String password=passwordEdit.getText();
String path=pathEdit.getText();
String filename=filenameEdit.getText();
try {
FtpClientftpClient=new FtpClient();
ftpClient.openServer(server);
ftpClient.login(user, password);
if (path.length()!=0) ftpClient.cd(path);
ftpClient.binary();
TelnetOutputStream os=ftpClient.put(filename);
File file_in=new File(filename);
FileInputStream is=new FileInputStream(file_in);
byte[] bytes=new byte[1024];
int c;
while ((c=is.read(bytes))!=-1){
os.write(bytes,0,c);}
is.close();
os.close();
ftpClient.closeServer();
} catch (IOException ex) {;}
}
}