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Generate PDF Invoice From HTML Template | Java | HTML To PDF API
Main.java:
J#
package com.company; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import com.google.gson.JsonPrimitive; import okhttp3.*; import java.io.*; import java.net.*; import java.nio.file.Files; 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 = "***********************************"; public static void main(String[] args) throws IOException { // HTML template final String template = new String(Files.readAllBytes(Paths.get(".\\invoice_template.html"))); // Data to fill the template final String templateData = new String(Files.readAllBytes(Paths.get(".\\invoice_data.json"))); // Destination PDF file name final Path destinationFile = Paths.get(".\\result.pdf"); // Create HTTP client instance OkHttpClient webClient = new OkHttpClient(); // Prepare URL for `HTML to PDF` API call String query = String.format( "https://api.pdf.co/v1/pdf/convert/from/html?name=%s", destinationFile.getFileName()); // Make correctly escaped (encoded) URL URL url = null; try { url = new URI(null, query, null).toURL(); } catch (URISyntaxException e) { e.printStackTrace(); } // Prepare request body in JSON format JsonObject jsonBody = new JsonObject(); jsonBody.add("html", new JsonPrimitive(template)); jsonBody.add("templateData", new JsonPrimitive(templateData)); RequestBody body = RequestBody.create(MediaType.parse("application/json"), jsonBody.toString()); // 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 PDF file String resultFileUrl = json.get("url").getAsString(); // Download PDF file downloadFile(webClient, resultFileUrl, destinationFile.toFile()); System.out.printf("Generated PDF file saved as \"%s\" file.", destinationFile.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, File 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); output.write(fileBytes); output.flush(); output.close(); response.close(); } }