ftp上传文件到服务器java代码

好的，关于这个问题，以下是一个简单的示例代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class FTPUploader {

    public static void main(String[] args) {
        String server = "yourFTPserver.com";
        int port = 21;
        String username = "yourUsername";
        String password = "yourPassword";
        String filePath = "/path/to/your/file.txt";
        String remoteDirPath = "/remote/directory/path/";

        try {
            Socket socket = new Socket(server, port);
            InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream();

            login(username, password, inputStream, outputStream);

            sendCommand("CWD " + remoteDirPath, inputStream, outputStream);
            sendCommand("TYPE I", inputStream, outputStream);

            File file = new File(filePath);
            FileInputStream fileInputStream = new FileInputStream(file);
            sendCommand("STOR " + file.getName(), inputStream, outputStream);

            byte[] buffer = new byte[4096];
            int bytesRead = 0;
            while ((bytesRead = fileInputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }

            fileInputStream.close();
            outputStream.close();
            inputStream.close();
            socket.close();

            System.out.println("File transfer complete!");

        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void login(String username, String password, InputStream inputStream, OutputStream outputStream) throws IOException {
        sendCommand("USER " + username, inputStream, outputStream);
        sendCommand("PASS " + password, inputStream, outputStream);
    }

    private static void sendCommand(String command, InputStream inputStream, OutputStream outputStream) throws IOException {
        outputStream.write((command + "\r\n").getBytes());
        String response = readResponse(inputStream);
        System.out.println("> " + command);
        System.out.println("< " + response);
    }

    private static String readResponse(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[4096];
        int bytesRead = inputStream.read(buffer);
        return new String(buffer, 0, bytesRead);
    }
}

这是一个基本的FTP上传文件的Java代码，需要根据你的具体情况进行修改。这段代码使用Socket连接FTP服务器，登录验证后进入指定的远程目录，将本地文件上传到服务器。