http response json example java

How to get JSON from HTTP response in Java?
To get a JSON object from a HTTP response in Java, you can use the JSONObject class from the org. json library.
In this example, the execute() method of the HttpClient object is used to send the HTTP request and get the response.
Either use an export mapping to create a JSON string that you can pass to the Java action and then create a JSON object again from that string or just pass a root object to the Java and then in Java retrieve all the attached objects over the references to that root object.

How to return response as JSON in Java?

Returning JSON in Response [Java Code] To return JSON from the server, you must include the JSON data in the body of the HTTP response message and provide a "Content-Type: application/json" response header.
The Content-Type response header allows the client to interpret the data in the response body correctly._{15 jan. 2023}

How to write JSON response in Java?

To send a JSON response from the Servlet we first need to convert the Employee object into its JSON representation.
There are many java libraries available to convert an object to there JSON representation and vice versa.
Most prominent of them would be the Gson and Jackson libraries._{8 jan. 2024}

Overview

As we know, the HttpClientclass, introduced in Java 11, helps to request HTTP resources from a server. It supports both synchronous and asynchronous programming patterns. In this tutorial, we’ll explore different ways of mapping HTTP responses from HttpClient to the Plain Old Java Object (POJO) classes. baeldung.com

Example Setup

Let’s write a simple program, Todo. The program will consume a fake REST API. We’ll perform a GET request and later manipulate the response. baeldung.com

Map Response to Pojo Class Using Jackson

Jacksonis a popular Java JSON library. It helps serialize and deserialize JSON for further manipulation. We’ll use it to deserialize the JSON response from the example setup. We’ll map the response to the Todo POJO class. Let’s enhance the class containing our client-side logic. We’ll create a new method and invoke the sampleApiRequest()method to m

Map Response to Pojo Class Using Gson

Gson is a Java library by Google. It’s as popular as Jackson in the Java ecosystem. It helps to map JSON String to Java objects for further processing. This library can also convert Java objects into JSON. We’ll use it to map JSON response from the example setup to its equivalent POJO class, Todo. Let’s write a new method, syncGson(),in the class c

Asynchronous Call

Now, let’s implement the API call asynchronously. In an asynchronous pattern, threads don’t wait for each other to complete. This programming pattern makes fetching data more robust and scalable. Let’s fetch the sample API asynchronously and map the JSON response to the POJO class. baeldung.com

Conclusion

In this article, we learned four ways to map JSON responses to a POJO class when using HttpClient. Additionally, we dived into synchronous and asynchronous programming patterns with HttpClient. Furthermore, we used Jackson and Gson library to deserialize JSON response and map JSON String to a POJO class. As always, the source code for the examples

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