☕
Java Captcha Solver

OkHttp (recommended)

Add to pom.xml:

<dependency>
  <groupId>com.squareup.okhttp3</groupId>
  <artifactId>okhttp</artifactId>
  <version>4.12.0</version>
</dependency>

import okhttp3.*;
import org.json.JSONObject;
import java.io.File;

public class CaptchaSolver {
    private static final String API_KEY = "YOUR_API_KEY";
    private static final OkHttpClient client = new OkHttpClient();

    public static String solve(String imagePath) throws Exception {
        RequestBody body = new MultipartBody.Builder()
            .setType(MultipartBody.FORM)
            .addFormDataPart("image", "captcha.png",
                RequestBody.create(new File(imagePath),
                    MediaType.parse("image/png")))
            .build();

        Request request = new Request.Builder()
            .url("https://fastcaptcha.org/api/v1/ocr/")
            .addHeader("X-API-Key", API_KEY)
            .post(body)
            .build();

        try (Response response = client.newCall(request).execute()) {
            JSONObject json = new JSONObject(response.body().string());
            if (json.getBoolean("success")) {
                return json.getString("text");
            }
            throw new RuntimeException("API error: " + json.getString("error"));
        }
    }
}

Java HttpClient (Java 11+, no deps)

import java.net.http.*;
import java.net.URI;
import java.nio.file.*;
import java.util.UUID;

public class CaptchaSolver {
    private static final String API_KEY = "YOUR_API_KEY";
    private static final HttpClient client = HttpClient.newHttpClient();

    public static String solve(Path imagePath) throws Exception {
        String boundary = UUID.randomUUID().toString();
        byte[] imageBytes = Files.readAllBytes(imagePath);

        String body =
            "--" + boundary + "\r\n" +
            "Content-Disposition: form-data; name=\"image\"; filename=\"captcha.png\"\r\n" +
            "Content-Type: image/png\r\n\r\n";

        byte[] prefix = body.getBytes();
        byte[] suffix = ("\r\n--" + boundary + "--\r\n").getBytes();
        byte[] full = new byte[prefix.length + imageBytes.length + suffix.length];
        System.arraycopy(prefix, 0, full, 0, prefix.length);
        System.arraycopy(imageBytes, 0, full, prefix.length, imageBytes.length);
        System.arraycopy(suffix, 0, full, prefix.length + imageBytes.length, suffix.length);

        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://fastcaptcha.org/api/v1/ocr/"))
            .header("X-API-Key", API_KEY)
            .header("Content-Type", "multipart/form-data; boundary=" + boundary)
            .POST(HttpRequest.BodyPublishers.ofByteArray(full))
            .build();

        HttpResponse<String> response = client.send(request,
            HttpResponse.BodyHandlers.ofString());

        // Parse JSON (use org.json or Gson)
        // JSONObject json = new JSONObject(response.body());
        // return json.getString("text");
        return response.body(); // parse as needed
    }
}