Скачать или смотреть Accessing Third Party API Data in Java Spring Boot

Learn how to effectively access and display `API data` in Java Spring Boot by utilizing RestTemplate and handling JSON response objects.
---
This video is based on the question https://stackoverflow.com/q/72707080/ asked by the user 'walknthedark' ( https://stackoverflow.com/u/19386194/ ) and on the answer https://stackoverflow.com/a/72707292/ provided by the user 'Fernando Bravo Diaz' ( https://stackoverflow.com/u/8980452/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to access third party API data in Java Spring Boot

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Accessing Third Party API Data in Java Spring Boot: A Complete Guide

When developing applications that rely on external data, being able to access third-party APIs is often a key requirement. In this guide, we will explore how to access data from an API in a Java Spring Boot application, focusing specifically on parsing JSON structures to extract information like latitude and longitude.

The Problem

You may encounter situations where you need to display specific data, such as latitude and longitude, from a JSON response returned by a third-party API. For instance, how do you query the ISS (International Space Station) location through an API endpoint and present that information on your application?

To demonstrate this, we'll work with the API provided by Open Notify, which grants us access to the current location of the ISS.

Here's an example of the desired output:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

Step 1: Create the POJOs

To work with the response data, you need to define Plain Old Java Objects (POJOs) that will map the JSON fields. This will help us extract the desired data more easily.

[[See Video to Reveal this Text or Code Snippet]]

IssPosition: This class holds the latitude and longitude.

IssResponse: This class represents the complete response which contains iss_position, message, and the timestamp. The @ JsonProperty annotation helps map the JSON field names correctly, especially when they use different naming conventions.

Step 2: Make the API Call

With the POJOs ready, you can now set up your Spring Boot application to make the API call using RestTemplate.

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code:

RestController: This annotation allows your class to respond to web requests.

GetMapping: This annotation maps HTTP GET requests onto specific handler methods.

RestTemplate: This is a synchronous client for making HTTP requests. We use it here to send a GET request to the API endpoint.

ResponseEntity: This represents the entire HTTP response, including the body, status code, and headers. Here, you'll get a structured response of IssResponse to access the necessary data.

Step 3: Return the Data

Finally, the latitude and longitude values are obtained through the IssPosition object and returned as a simplified JSON response.

Conclusion

In summary, to access third-party API data in Java Spring Boot:

Define POJOs according to the expected JSON structure.

Use RestTemplate to make GET requests to the API.

Extract the needed information and return it in the desired format.

This process demonstrates how to efficiently retrieve and manipulate API data in a Spring Boot application. By following these steps, you can handle various APIs and display their information seamlessly.

If you have any questions or need further information, feel free to ask!