从url读取pdf文件到字节数组

URL url = new URL("http://example.com/example.pdf");
InputStream inputStream = url.openStream();

byte[] pdfBytes = IOUtils.toByteArray(inputStream);

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
    byteArrayOutputStream.write(buffer, 0, length);
}
byte[] pdfBytes = byteArrayOutputStream.toByteArray();

inputStream.close();

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;

import org.apache.commons.io.IOUtils;

public class PdfReader {
    public static void main(String[] args) throws Exception {
        URL url = new URL("http://example.com/example.pdf");
        InputStream inputStream = url.openStream();
        byte[] pdfBytes = IOUtils.toByteArray(inputStream);
        inputStream.close();
        // 使用pdfBytes进行后续操作
    }
}