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Javascript 中的 Java教程:如何实现FTP功能


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FtpList部分是用来显示FTP服务器上的文件;

 

GetButton部分为从FTP服务器下传一个文件;

 

PutButton部分为向FTP服务器上传一个文件。

 

别忘了在程序中还要引入两个库文件(import sun.net.*,import sun.net.ftp.*)。

 

以下是这三部分的JAVA源程序:

 

(1)显示FTP服务器上的文件

 

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)从FTP服务器上下传一个文件

 

 

  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)向FTP服务器上上传一个文件

 

 

  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 {
  FtpClient ftpClient=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) {;}
  }
  }