Generate PDF From HTML File - Java
PDF from HTML (HTML to PDF) sample in Java demonstrating ‘Generate PDF From HTML File’
sample.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
<head>
<title>TODO List</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>TODO List</h1>
<ul>
<li>
Wash the car
</li>
<li>
Do the dishes
</li>
<li>
Walk the dog
</li>
<li>
Buy A4 papers
</li>
</ul>
</body>
</html>
Main.java
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
final static String API_KEY = "***********************************";
public static void main(String[] args) throws IOException
{
// HTML input
final String inputSample = new String(Files.readAllBytes(Paths.get(".\\sample.html")));
// 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 apiUrl = "https://api.pdf.co/v1/pdf/convert/from/html";
// Make correctly escaped (encoded) URL
URL url = null;
try
{
url = new URI(null, apiUrl, null).toURL();
}
catch (URISyntaxException e)
{
e.printStackTrace();
}
// Prepare request body in JSON format
// See documentation: https://apidocs.pdf.co/?#1-json-pdfconvertfromhtml
JsonObject jsonBody = new JsonObject();
// Input HTML code to be converted. Required.
jsonBody.add("html", new JsonPrimitive(inputSample));
// Name of resulting file
jsonBody.add("name", new JsonPrimitive(destinationFile.getFileName().toString()));
// Set to css style margins like 10 px or 5px 5px 5px 5px.
jsonBody.add("margins", new JsonPrimitive("5px 5px 5px 5px"));
// Can be Letter, A4, A5, A6 or custom size like 200x200
jsonBody.add("paperSize", new JsonPrimitive("Letter"));
// Set to Portrait or Landscape. Portrait by default.
jsonBody.add("orientation", new JsonPrimitive("Portrait"));
// true by default. Set to false to disable printing of background.
jsonBody.add("printBackground", new JsonPrimitive(true));
// If large input document, process in async mode by passing true
jsonBody.add("async", new JsonPrimitive(false));
// Set to HTML for header to be applied on every page at the header.
jsonBody.add("header", new JsonPrimitive(""));
// Set to HTML for footer to be applied on every page at the bottom.
jsonBody.add("footer", new JsonPrimitive(""));
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();
}
}
PDF.co Web API: the Web API with a set of tools for documents manipulation, data conversion, data extraction, splitting and merging of documents. Includes image recognition, built-in OCR, barcode generation and barcode decoders to decode bar codes from scans, pictures and pdf.