Prompt Title: Return byte from url

To return the content of a document in bytes in a Java Spring application, you can create a method in a controller class that accepts the URL of the document and returns the byte array of the document's content.

Here is an example of how you can achieve this:

javaCopy code
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DocumentController {

    @GetMapping("/document")
    public byte[] getDocumentContent(@RequestParam String url) throws Exception {
        // Create a URL object from the URL string
        URL documentUrl = new URL(url);

        // Open a connection to the URL and get the input stream
        InputStream inputStream = documentUrl.openStream();

        // Read the content of the document into a byte array using a ByteArrayOutputStream
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byteArrayOutputStream.write(buffer, 0, bytesRead);
        }
        byte[] documentContent = byteArrayOutputStream.toByteArray();

        // Close the input stream and the output stream
        inputStream.close();
        byteArrayOutputStream.close();

        return documentContent;
    }
}

In this example, the getDocumentContent method takes a URL parameter url and returns the byte array of the document's content. The method opens a connection to the URL, reads the content of the document into a byte array using a ByteArrayOutputStream, and then returns the byte array.

Note that this example assumes that the URL of the document is publicly accessible and does not require any authentication or authorization. If the document requires authentication or authorization, you will need to provide the necessary credentials or tokens in the request headers or query parameters.