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How to call third-party API in Spring Boot

Patricia Arquette

Jan 23, 2025 pm 10:04 PM

This Spring Boot tutorial demonstrates how to consume a third-party API and display the results in a Thymeleaf view. Let's refine the text and code for clarity and accuracy.

Revised Text:

Overview

This tutorial guides you through integrating a third-party API into a Spring Boot application. We'll make a GET request to https://api.sampleapis.com/coffee/hot, then elegantly present the response data within a Thymeleaf template displayed in your browser.

Prerequisites

Basic familiarity with the following is assumed:

Java
Spring Boot
Thymeleaf
Maven (or Gradle) for dependency management

Development Process

1. Project Setup

Use Spring Initializr (https://www.php.cn/link/bafd1b75c5f0ceb81050a853c9faa911) to create a new Spring Boot project. Include the following dependencies:

How to call third-party API in Spring Boot

Extract the downloaded archive and import the project into your IDE (e.g., IntelliJ IDEA).

2. Create the Coffee Model

Create a POJO (Plain Old Java Object) to represent the coffee data received from the API. This simplifies data handling.

package com.myproject.apidemo;
 
public class Coffee {
    public String title;
    public String description;
 
    // Constructors, getters, and setters (omitted for brevity)
    @Override
    public String toString() {
        return "Coffee{" +
                "title='" + title + '\'' +
                ", description='" + description + '\'' +
                '}';
    }
}

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3. Create the CoffeeController

This controller handles the API call and data processing.

package com.myproject.apidemo;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.core.ParameterizedTypeReference;
import java.util.List;
 
@Controller
public class CoffeeController {
 
    @GetMapping("/coffee")
    public String getCoffee(Model model) {
        String url = "https://api.sampleapis.com/coffee/hot";
 
        WebClient webClient = WebClient.create();
 
        List<Coffee> coffeeList = webClient.get()
                .uri(url)
                .retrieve()
                .bodyToMono(new ParameterizedTypeReference<List<Coffee>>() {})
                .block();
 
 
        model.addAttribute("coffeeList", coffeeList);
        return "coffee";
    }
}

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Note: Error handling (e.g., using onErrorResume with WebClient) should be added for production-ready code. The block() method is used here for simplicity but should be replaced with reactive programming techniques for better performance in a real-world application.

4. Create the Thymeleaf View (coffee.html)

Create a Thymeleaf template to display the coffee data. Place this file in src/main/resources/templates/coffee.html.

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Coffee List</title>
</head>
<body>
    <h3>Coffee List</h3>
    <table>
        <thead>
            <tr>
                <th>Title</th>
                <th>Description</th>
            </tr>
        </thead>
        <tbody>
            <tr th:each="coffee : ${coffeeList}">
                <td th:text="${coffee.title}"></td>
                <td th:text="${coffee.description}"></td>
            </tr>
        </tbody>
    </table>
</body>
</html>

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5. Run the Application

Start your Spring Boot application. You should now be able to access the coffee list at http://localhost:8080/coffee (or your application's base URL).

This revised version provides a more complete and accurate representation of the process, including crucial details like the Coffee model class and improved code formatting. Remember to handle potential errors in a production environment.

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