Using OpenAI ChatGPT API with Java: A comprehensive guide

Manpreet Singh
4 min readJan 15

ChatGPT is a powerful language model developed by OpenAI that can be used to generate human-like text. The OpenAI API allows developers to access the model and use it in their own applications. In this article, we will discuss how to use the OpenAI API with the Java Spring Framework to generate images with ChatGPT.

Before getting started, you will need to sign up for an API key on the OpenAI website “”.
Once you have your API key, you can start making requests to the API.

To use the OpenAI API with the Java Spring Framework, you will need to use a library that can handle HTTP requests. One popular library for this is the Spring RestTemplate library. RestTemplate is a powerful and flexible library that allows you to easily send HTTP requests and handle the responses.

First, you’ll need to add the Spring RestTemplate library to your project. You can do this by adding the following dependency to your build.gradle file:

plugins {
id 'java'
id 'org.springframework.boot' version '3.0.1'
id 'io.spring.dependency-management' version '1.1.0'

group = 'com.openai'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'

repositories {

dependencies {
implementation 'org.springframework.boot:spring-boot-starter-web'
testImplementation 'org.springframework.boot:spring-boot-starter-test'

tasks.named('test') {

Next, create a class that will handle the API calls. You can use the following class as an example:

public class OpenAi
private static final String OPENAI_URL = "";

private final String apiKey = "<your-api-key";
private final RestTemplate restTemplate = new RestTemplate();

public String generateImages(String prompt, float temperature, int maxTokens, String stop, final int logprobs, final boolean echo)
HttpHeaders headers = new HttpHeaders();
headers.set("Authorization", "Bearer " + apiKey);

// We are including only some of the parameters to the json request
String requestJson = "{\"prompt\":\"" + prompt + "\",\"n\":" + n + "}";

HttpEntity<String> request = new…
Manpreet Singh

Software developer who loves writing about programming, technology, passive income strategies etc.


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