The Best Java API for Shipping Container OCR

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import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Path;
import com.google.gson.Gson;
import com.google.gson.JsonObject;

public class ContainerOcr {

    public static void main(String[] args) throws IOException, InterruptedException {
        String apiKey = "YOUR_API_KEY"; // Replace with your actual API key
        String imagePath = "path/to/your/container_image.jpg"; // Replace with the path to your image

        // 1. Create the HTTP client
        HttpClient client = HttpClient.newHttpClient();

        // 2. Build the HTTP request (Direct File Upload)
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://api.structocr.com/v1/container"))
                .header("x-api-key", apiKey)
                .header("Content-Type", "application/octet-stream")
                .POST(HttpRequest.BodyPublishers.ofFile(Path.of(imagePath)))
                .build();

        System.out.println("Uploading image to StructOCR API...");

        // 3. Send the request and receive the response
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

        // 4. Parse the JSON response
        Gson gson = new Gson();
        JsonObject jsonResponse = gson.fromJson(response.body(), JsonObject.class);

        // 5. Extract the Container data
        if (jsonResponse.has("success") && jsonResponse.get("success").getAsBoolean()) {
            JsonObject data = jsonResponse.getAsJsonObject("data");
            String containerNumber = data.get("container_number").getAsString();
            boolean isValid = data.get("is_valid").getAsBoolean();
            
            System.out.println("✅ Extraction Successful!");
            System.out.println("Container Number: " + containerNumber);
            System.out.println("Is Valid (ISO 6346): " + isValid);
            System.out.println("Confidence: " + data.get("confidence").getAsString());

            if (data.has("parsed")) {
                JsonObject parsed = data.getAsJsonObject("parsed");
                System.out.println("--- Parsed Details ---");
                System.out.println("Owner Code: " + parsed.get("owner_code").getAsString());
                System.out.println("Category: " + parsed.get("category").getAsString());
                System.out.println("Serial Number: " + parsed.get("serial_number").getAsString());
                System.out.println("Check Digit: " + parsed.get("check_digit").getAsString());
            }
        } else {
            String errorMsg = jsonResponse.has("error") ? jsonResponse.get("error").getAsString() : "Unknown Error";
            System.out.println("❌ Error: " + errorMsg);
        }
    }
}