java put 上传文件流

你可以使用Java的HttpURLConnection类来上传文件流。以下是一个示例代码：

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public class FileUploader {

    public static void main(String[] args) {
        String fileUrl = "http://example.com/upload"; // 上传地址
        String filePath = "/path/to/file"; // 文件路径

        try {
            URL url = new URL(fileUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("PUT");
            conn.setDoOutput(true);

            // 设置请求头
            conn.setRequestProperty("Content-Type", "application/octet-stream");
            conn.setRequestProperty("Content-Length", String.valueOf(new File(filePath).length()));

            OutputStream out = conn.getOutputStream();
            BufferedInputStream in = new BufferedInputStream(new FileInputStream(filePath));

            byte[] buffer = new byte[1024];
            int len;

            while ((len = in.read(buffer)) != -1) {
                out.write(buffer, 0, len);
            }

            in.close();
            out.flush();
            out.close();

            int responseCode = conn.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 上传成功
            } else {
                // 上传失败
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这个例子中，我们使用PUT方法上传文件流，设置了Content-Type和Content-Length请求头，然后将文件流写入输出流中。最后，我们可以检查响应码来确定上传是否成功。