Image to Image / Java Guide

Overview

This page serves as a guide for using the PDFCrowd API to convert between images formats in Java applications.

Installation

You can install the client library from Maven by adding the following dependency section to your pom.xml dependencies: 
<dependency>
  <groupId>com.pdfcrowd</groupId>
  <artifactId>pdfcrowd</artifactId>
  <version>6.4.0</version>
  <scope>compile</scope>
</dependency>
You can install the client library by Gradle (e.g. for Android Studio) from Maven by adding the following line to your gradle dependencies: 
compile 'com.pdfcrowd:pdfcrowd:6.4.0'
Clone pdfcrowd-java from Github and build the library. 
git clone https://github.com/pdfcrowd/pdfcrowd-java
cd pdfcrowd-java
mvn install

Quick Start

Below are Java examples to help you quickly get started with the API. Explore our additional examples for more insights. 

import com.pdfcrowd.*;
import java.io.*;

public class ApiTest {
    public static void main(String[] args) throws IOException, Pdfcrowd.Error {
        try {
            // Create an API client instance.
            Pdfcrowd.ImageToImageClient client =
                new Pdfcrowd.ImageToImageClient("your_username", "your_apikey");

            // Configure the conversion.
            client.setOutputFormat("jpg");

            // Run the conversion and save the result to a file.
            client.convertUrlToFile("https://pdfcrowd.com/static/images/logo.png", "logo.jpg");
        }
        catch(Pdfcrowd.Error why) {
            System.err.println("Pdfcrowd Error: " + why);
            throw why;
        }
        catch(IOException why) {
            System.err.println("IO Error: " + why);
            throw why;
        }
    }
}
import com.pdfcrowd.*;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;

public class ApiTest {
    public static void main(String[] args) throws IOException, Pdfcrowd.Error {
        try {
            // Create an API client instance.
            Pdfcrowd.ImageToImageClient client =
                new Pdfcrowd.ImageToImageClient("your_username", "your_apikey");

            // Configure the conversion.
            client.setOutputFormat("jpg");

            // Run the conversion and save the result to a file.
            client.convertRawDataToFile(Files.readAllBytes(Paths.get("/path/to/logo.png")), "logo.jpg");
        }
        catch(Pdfcrowd.Error why) {
            System.err.println("Pdfcrowd Error: " + why);
            throw why;
        }
        catch(IOException why) {
            System.err.println("IO Error: " + why);
            throw why;
        }
    }
}

Authentication

Error Handling

It is recommended that you implement error handling to catch errors the API may return. Effective error handling is vital as it ensures application stability and provides clearer diagnostics. See the example code below for guidance on implementing error handling, and refer to this list of status codes for more information. 

try {
    // call the API 
}
catch(Pdfcrowd.Error why) {
    // print the error
    System.err.println("Pdfcrowd Error: " + why);

    // print the error code
    System.err.println("Pdfcrowd Error Code: " + why.getCode());

    // print the error message
    System.err.println("Pdfcrowd Error Message: " + why.getMessage());
}

Troubleshooting

  • If you are receiving an error, refer to the API Status Codes for more information.
  • Use setDebugLog() and getDebugLogUrl() to obtain detailed information about the conversion process, including load errors, load times, browser console output, etc.
  • Consult the FAQ for answers to common questions.
  • Contact us if you need assistance or if there is a feature you are missing.

API Method Reference

Refer to the Image to Image Java Reference for a description of all API methods.