PDF.co Web API – Barcode Generator API – Java – Generate Barcode

PDF.co Web API – Barcode Generator API – Java – Generate Barcode

Main.java

package com.company;

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

import java.io.*;
import java.net.*;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Main
{
    // The authentication key (API Key).
    // Get your own by registering at https://app.pdf.co/documentation/api
    final static String API_KEY = "***********************************";

    // Result file name
    final static Path ResultFile = Paths.get(".\\barcode.png");
    // Barcode type. See valid barcode types in the documentation https://app.pdf.co/documentation/api/1.0/barcode/generate.html
    final static String BarcodeType = "Code128";
    // Barcode value
    final static String BarcodeValue = "qweasd123456";

        
    public static void main(String[] args) throws IOException
    {
        // Create HTTP client instance
        OkHttpClient webClient = new OkHttpClient();
        
        // Prepare URL for `Barcode Generator` API call
        String query = String.format(
                "https://api.pdf.co/v1/barcode/generate?name=%s&type=%s&value=%s",
                ResultFile.getFileName(),
                BarcodeType,
                BarcodeValue);
        
        // Make correctly escaped (encoded) URL
        URL url = null;
        try
        {
            url = new URI(null, query, null).toURL();
        }
        catch (URISyntaxException e)
        {
            e.printStackTrace();
        }

        // Prepare request
        Request request = new Request.Builder()
                .url(url)
                .addHeader("x-api-key", API_KEY) // (!) Set API Key
                .build();

        // Execute request
        Response response = webClient.newCall(request).execute();

        if (response.code() == 200)
        {
            // Parse JSON response
            JsonObject json = new JsonParser().parse(response.body().string()).getAsJsonObject();

            boolean error = json.get("error").getAsBoolean();
            if (!error)
            {
                // Get URL of generated barcode image file
                String resultFileUrl = json.get("url").getAsString();

                // Download the image file
                downloadFile(webClient, resultFileUrl, ResultFile);

                System.out.printf("Generated barcode saved to \"%s\" file.", ResultFile.toString());
            }
            else
            {
                // Display service reported error
                System.out.println(json.get("message").getAsString());
            }
        }
        else
        {
            // Display request error
            System.out.println(response.code() + " " + response.message());
        }
    }

    public static void downloadFile(OkHttpClient webClient, String url, Path destinationFile) throws IOException
    {
        // Prepare request
        Request request = new Request.Builder()
                .url(url)
                .build();
        // Execute request
        Response response = webClient.newCall(request).execute();

        byte[] fileBytes = response.body().bytes();

        // Save downloaded bytes to file
        OutputStream output = new FileOutputStream(destinationFile.toFile());
        output.write(fileBytes);
        output.flush();
        output.close();

        response.close();
    }
}

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