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在Java应用程序中实现FTP功能需要使用FTPClient类和相关方法。下面是实现三个主要功能的示例代码：
1）显示FTP服务器上的文件：
void ftpList_actionPerformed(ActionEvent e) {String server = serverEdit.getText();String user = userEdit.getText();String password = passwordEdit.getText();String path = pathEdit.getText();try {FTPClient ftpClient = new FTPClient();ftpClient.connect(server);ftpClient.login(user, password);if (path.length() != 0)ftpClient.changeWorkingDirectory(path);FTPFile[] files = ftpClient.listFiles();for (FTPFile file : files) {System.out.println(file.getName());}ftpClient.logout();ftpClient.disconnect();} catch (IOException ex) {ex.printStackTrace();}
}
2）从FTP服务器下载一个文件：
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.connect(server);ftpClient.login(user, password);if (path.length() != 0)ftpClient.changeWorkingDirectory(path);FileOutputStream outputStream = new FileOutputStream(new File(filename));ftpClient.retrieveFile(filename, outputStream);outputStream.close();ftpClient.logout();ftpClient.disconnect();} catch (IOException ex) {ex.printStackTrace();}
}
3）向FTP服务器上传一个文件：
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.connect(server);ftpClient.login(user, password);if (path.length() != 0)ftpClient.changeWorkingDirectory(path);FileInputStream inputStream = new FileInputStream(new File(filename));ftpClient.storeFile(filename, inputStream);inputStream.close();ftpClient.logout();ftpClient.disconnect();} catch (IOException ex) {ex.printStackTrace();}
}
请注意，以上示例代码使用的是Apache Commons Net库中的FTPClient类。您需要确保已将相关库文件添加到项目中，并在代码中进行引入。此外，根据您的需求和环境设置，可能需要进行适当的异常处理和其他调整。