将二进制图像数据从URL读取到HttpUrlConnect::URL的ByteArrayInputStream中

import java.io.*;
import java.net.*;

public class ImageReader {

    public static void main(String[] args) {
        String imageUrl = "http://example.com/image.jpg"; // 图像的URL地址

        try {
            URL url = new URL(imageUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // 设置请求属性，例如超时时间等
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            
            // 连接到URL资源
            connection.connect();

            // 读取输入流中的二进制图像数据
            InputStream inputStream = connection.getInputStream();
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

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

            // 将ByteArrayOutputStream转换为ByteArrayInputStream
            ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(outputStream.toByteArray());

            // 关闭连接和输入流
            connection.disconnect();
            inputStream.close();

            // 使用byteArrayInputStream进行后续处理
            // ...

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