给我一个java编写的大文件上传的代码

以下是一个Java编写的大文件上传的示例代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class FileUploader {
    
    private static final int BUFFER_SIZE = 4096;

    public static void upload(String targetURL, String filePath) throws IOException {
        File uploadFile = new File(filePath);
        URL url = new URL(targetURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/octet-stream");
        connection.setRequestProperty("Content-Length", String.valueOf(uploadFile.length()));
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);
        connection.setChunkedStreamingMode(BUFFER_SIZE);
        
        try (InputStream inputStream = new FileInputStream(uploadFile)) {
            byte[] buffer = new byte[BUFFER_SIZE];
            int bytesRead = -1;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                connection.getOutputStream().write(buffer, 0, bytesRead);
            }
        }
        
        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            // 文件上传成功
            System.out.println("文件上传成功！");
        } else {
            // 文件上传失败
            System.out.println("文件上传失败，响应代码为：" + responseCode);
        }
        connection.disconnect();
    }
}

使用方法：

String targetURL = "http://example.com/upload";
String filePath = "/path/to/file";
FileUploader.upload(targetURL, filePath);

其中，`targetURL` 是文件上传的目标 URL，`filePath` 是要上传的文件的路径。请根据实际情况修改这两个变量的值。