FileUploader.java

package driver;

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

public class FileUploader {

    public static void main(String[] args) {
        String urlString = "http://10.60.23.210:8000/detect/";
		String image = "\\temp_ocr.png";
		String dynamicPath = "C:\\Users\\TG1773\\GGWorkspace\\GamesGlobalAutomation (3)\\GamesGlobalAutomation\\screenshots\\HyperStar_SamsungGalaxyS8_Landscape_20240621_160129";
        String filePath = dynamicPath+image;
        String boundary = "---------------------------" + System.currentTimeMillis();
        String lineEnd = "\r\n";
        String twoHyphens = "--";
        HttpURLConnection connection = null;
        DataOutputStream outputStream = null;

        try {
            File file = new File(filePath);
            FileInputStream fileInputStream = new FileInputStream(file);

            URL url = new URL(urlString);
            connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

            outputStream = new DataOutputStream(connection.getOutputStream());

            outputStream.writeBytes(twoHyphens + boundary + lineEnd);
            outputStream.writeBytes("Content-Disposition: form-data; name=\"file\";filename=\"" + file.getName() + "\"" + lineEnd);
            outputStream.writeBytes(lineEnd);

            int bytesRead, bytesAvailable, bufferSize;
            byte[] buffer;
            int maxBufferSize = 1 * 1024 * 1024;

            bytesAvailable = fileInputStream.available();
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            buffer = new byte[bufferSize];

            bytesRead = fileInputStream.read(buffer, 0, bufferSize);

            while (bytesRead > 0) {
                outputStream.write(buffer, 0, bufferSize);
                bytesAvailable = fileInputStream.available();
                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);
            }

            outputStream.writeBytes(lineEnd);
            outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

            fileInputStream.close();
            outputStream.flush();
            outputStream.close();

            InputStream inputStream = connection.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder stringBuilder = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
            }
            reader.close();

            System.out.println("Response from server:");
            System.out.println(stringBuilder.toString());

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }
    }
}