Use in-memory image in Plate Recognizer

PlaterecognizerLookupMemory.java

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


public class PlaterecognizerLookupMemory {
    static final String charset = "UTF-8";

    static final String PLATERECOGNIZER_API_TOKEN = "08b1a7048080dfef0bf######################";

    public static void main(String[] args) {
        try {
            URL url = new URL("https://app.platerecognizer.com/static/demo.jpg");
            sendMemoryFile(url);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public static void sendMemoryFile(URL url) throws Exception {
        String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
        String CRLF = "\r\n"; // Line separator required by multipart/form-data.
        String fileName = "snapshot.jpg";
        try (InputStream urlInputStream = url.openStream()) {
            try {
                URL obj = new URL("https://api.platerecognizer.com/v1/plate-reader/");
                HttpURLConnection con = (HttpURLConnection) obj.openConnection();
                con.setRequestMethod("POST");
                con.setRequestProperty("Authorization", "Token " + PLATERECOGNIZER_API_TOKEN);
                con.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
                con.setRequestProperty("Accept", "application/json");

                // For POST only - START
                con.setDoOutput(true);
                OutputStream os = con.getOutputStream();
                // os.write(POST_PARAMS.getBytes());
                PrintWriter writer = new PrintWriter(new OutputStreamWriter(os, charset), true);

                // Send binary file.
                writer.append("--" + boundary).append(CRLF);
                writer.append("Content-Disposition: form-data; name=\"upload\"; filename=\"" + fileName + "\"").append(CRLF);
                writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(CRLF);
                writer.append("Content-Transfer-Encoding: binary").append(CRLF);
                writer.append(CRLF).flush();

                byte[] buffer = new byte[1024];
                int len;
                while ((len = urlInputStream.read(buffer)) != -1) {
                    os.write(buffer, 0, len);
                }

                os.flush(); // Important before continuing with writer!
                writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.
                // End of multipart/form-data.
                writer.append("--" + boundary + "--").append(CRLF).flush();
                os.close();
                // For POST only - END

                int responseCode = con.getResponseCode();
                System.out.println("POST Response Code :: " + responseCode);

                if (responseCode == HttpURLConnection.HTTP_CREATED || responseCode == HttpURLConnection.HTTP_OK) { //success
                    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
                    String inputLine;
                    StringBuffer response = new StringBuffer();
                    while ((inputLine = in.readLine()) != null) {
                        response.append(inputLine);
                    }
                    in.close();
                    // print result
                    System.out.println(response.toString());
                } else {
                    System.out.println("POST failed");
                }
            } catch (Exception e) {
                System.out.println(e);
            }
        }
    }
}