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Generate Barcode | Java
Main.java:
J#
package com.company; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import okhttp3.*; 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 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://apidocs.pdf.co 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 = "https://api.pdf.co/v1/barcode/generate"; // Make correctly escaped (encoded) URL URL url = null; try { url = new URI(null, query, null).toURL(); } catch (URISyntaxException e) { e.printStackTrace(); } // Create JSON payload String jsonPayload = String.format("{\"name\": \"%s\", \"type\": \"%s\", \"value\": \"%s\"}", ResultFile.getFileName(), BarcodeType, BarcodeValue); // Prepare request body RequestBody body = RequestBody.create(MediaType.parse("application/json"), jsonPayload); // Prepare request Request request = new Request.Builder() .url(url) .addHeader("x-api-key", API_KEY) // (!) Set API Key .addHeader("Content-Type", "application/json") .post(body) .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(); } }