java ftp上传大文件 并打印上传进度信息

好的，针对您的问题，我可以给你提供以下Java代码示例，用于FTP上传大文件并打印上传进度信息：

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class FTPUploader {
    private FTPClient ftpClient;

    public FTPUploader(String host, String user, String password) throws IOException {
        ftpClient = new FTPClient();
        ftpClient.connect(host);
        ftpClient.enterLocalPassiveMode();
        ftpClient.login(user, password);
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
    }

    public void uploadFile(String localFilePath, String remoteFilePath) throws IOException {
        File localFile = new File(localFilePath);
        BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(localFile));
        ftpClient.storeFile(remoteFilePath, inputStream);
        inputStream.close();
    }

    public void uploadFileWithProgress(String localFilePath, String remoteFilePath) throws IOException {
        File localFile = new File(localFilePath);
        BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(localFile));
        long fileSize = localFile.length();
        long uploadedSize = 0;
        byte[] buffer = new byte[4096];
        int bytesRead = -1;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            ftpClient.appendFile(remoteFilePath, new BufferedInputStream(new ByteArrayInputStream(buffer, 0, bytesRead)));
            uploadedSize += bytesRead;
            System.out.println("Uploaded " + uploadedSize + " bytes out of " + fileSize);
        }
        inputStream.close();
    }

    public void disconnect() throws IOException {
        if (ftpClient.isConnected()) {
            ftpClient.logout();
            ftpClient.disconnect();
        }
    }
}

以上代码使用了 Apache Commons Net 库提供的 FTPClient 类，实现了 FTP 上传文件的功能。其中，uploadFile 方法用于上传小文件，而 uploadFileWithProgress 方法用于上传大文件并打印上传进度信息。

注意：在使用该代码时，需要将以下代码中的 `host`、`user` 和 `password` 替换为您的 FTP 服务器相关的信息。

FTPUploader uploader = new FTPUploader("host", "user", "password");
uploader.uploadFileWithProgress("local_file_path", "remote_file_path");
uploader.disconnect();

希望这个代码示例可以帮助到您。