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Java SDK

The official d3-java-client package provides a high‑level interface to the D3 Business API.

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Installation

Add the following dependency to your pom.xml: 
<dependency>
    <groupId>com.d3</groupId>
    <artifactId>d3-java-client</artifactId>
    <version>1.0.0</version>
</dependency>
Or for Gradle: 
implementation 'com.d3:d3-java-client:1.0.0'

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Quick start

import com.d3.client.D3Client;
import com.d3.client.D3ClientConfig;
import com.d3.client.models.*;

// Initialize the client
D3Client client = new D3Client(
    new D3ClientConfig("your-api-key-here")
        .setBaseUrl("https://api.dragdropdo.com")  // Optional, defaults to https://api.dragdropdo.com
        .setTimeout(30000)                 // Optional, defaults to 30000ms
);

// Upload a file
UploadResponse uploadResult = client.uploadFile(
    new UploadFileOptions()
        .setFile("/path/to/document.pdf")
        .setFileName("document.pdf")
        .setMimeType("application/pdf")
);

System.out.println("File key: " + uploadResult.getFileKey());

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Initialization

new D3Client(D3ClientConfig config)
Config:
  • apiKey (required) – your D3 API key.
  • baseUrl (optional) – API base URL, default: https://api.dragdropdo.com.
  • timeout (optional) – request timeout in ms, default: 30000.
  • headers (optional) – additional headers to send with every request.

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File upload

uploadFile(UploadFileOptions options)
Options:
  • file (required) – file path string.
  • fileName (required) – original file name.
  • mimeType (optional) – MIME type (auto‑detected if omitted).
  • parts (optional) – number of upload parts (auto‑calculated).
  • onProgress (optional) – progress callback (Consumer<UploadProgress>).
Example: 
UploadResponse result = client.uploadFile(
    new UploadFileOptions()
        .setFile("/path/to/file.pdf")
        .setFileName("document.pdf")
        .setMimeType("application/pdf")
        .setOnProgress(progress ->
            System.out.println("Upload: " + progress.getPercentage() + "%")
        )
);

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Supported operations

checkSupportedOperation(SupportedOperationOptions options)
Options:
  • ext (required) – file extension (e.g. pdf, jpg).
  • action (optional) – specific action (convert, compress, …).
  • parameters (optional) – parameters to validate (e.g. Map.of("convert_to", "png")).
Examples: 
// Get available actions for PDF
SupportedOperationResponse actions = client.checkSupportedOperation(
    new SupportedOperationOptions().setExt("pdf")
);
System.out.println(actions.getAvailableActions());

// Check if convert to PNG is supported
SupportedOperationResponse supported = client.checkSupportedOperation(
    new SupportedOperationOptions()
        .setExt("pdf")
        .setAction("convert")
        .setParameters(Map.of("convert_to", "png"))
);
System.out.println("Supported: " + supported.isSupported());

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Create operations

createOperation(OperationOptions options)
Options:
  • action (required) – "convert" | "compress" | "merge" | "zip" | "share" | "lock" | "unlock" | "reset_password".
  • fileKeys (required) – list of file keys from upload.
  • parameters (optional) – action‑specific parameters.
  • notes (optional) – user metadata.
Examples: 
// Convert PDF to PNG
client.createOperation(new OperationOptions(
    "convert",
    List.of(uploadResult.getFileKey()),
    Map.of("convert_to", "png"),
    Map.of("userId", "user-123")
));

// Compress
client.createOperation(new OperationOptions(
    "compress",
    List.of(uploadResult.getFileKey()),
    Map.of("compression_value", "recommended"),
    null
));

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Convenience helpers

The client exposes shorthand helpers: 
client.convert(fileKeys, convertTo, notes)
client.compress(fileKeys, compressionValue, notes)
client.merge(fileKeys, notes)
client.zip(fileKeys, notes)
client.share(fileKeys, notes)
client.lockPdf(fileKeys, password, notes)
client.unlockPdf(fileKeys, password, notes)
client.resetPdfPassword(fileKeys, oldPassword, newPassword, notes)

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Status & polling

getStatus(StatusOptions options)
pollStatus(PollStatusOptions options)
Examples: 
// Single status fetch
StatusResponse status = client.getStatus(
    new StatusOptions().setMainTaskId("task-123")
);

// Poll until completion
StatusResponse finalStatus = client.pollStatus(
    new PollStatusOptions()
        .setMainTaskId("task-123")
        .setInterval(2000)
        .setTimeout(300000)
        .setOnUpdate(s -> System.out.println("Status: " + s.getOperationStatus()))
);

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Complete workflow example

import com.d3.client.D3Client;
import com.d3.client.D3ClientConfig;
import com.d3.client.models.*;
import com.d3.client.exceptions.*;
import java.util.*;

public class Example {
    public static void main(String[] args) {
        D3Client client = new D3Client(
            new D3ClientConfig(System.getenv("D3_API_KEY"))
                .setBaseUrl("https://api.dragdropdo.com")
        );

        try {
            // 1. Upload
            UploadResponse uploadResult = client.uploadFile(
                new UploadFileOptions()
                    .setFile("./document.pdf")
                    .setFileName("document.pdf")
            );

            // 2. Check support
            SupportedOperationResponse supported = client.checkSupportedOperation(
                new SupportedOperationOptions()
                    .setExt("pdf")
                    .setAction("convert")
                    .setParameters(Map.of("convert_to", "png"))
            );
            if (!supported.isSupported()) {
                throw new Exception("Convert to PNG is not supported");
            }

            // 3. Create operation
            OperationResponse operation = client.convert(
                List.of(uploadResult.getFileKey()),
                "png",
                Map.of("userId", "user-123", "source", "api")
            );

            // 4. Poll
            StatusResponse status = client.pollStatus(
                new PollStatusOptions()
                    .setMainTaskId(operation.getMainTaskId())
                    .setInterval(2000)
            );

            if ("completed".equals(status.getOperationStatus())) {
                status.getFilesData().forEach(file ->
                    System.out.println("Download: " + file.getDownloadLink())
                );
            }
        } catch (D3APIError e) {
            System.out.println("API Error (" + e.getStatusCode() + "): " + e.getMessage());
        } catch (D3ValidationError e) {
            System.out.println("Validation Error: " + e.getMessage());
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}