Making an HTTP POST request

In this recipe, we will look at posting some data to an HTTP service via the request body. We will post the data to the http://httpbin.org/post URL.

Note

We will skip the package prefix for the classes, as it is assumed to be java.net.http.

 

How to do it...

1. Create an instance of HttpClient using its HttpClient.Builder builder:

        HttpClient client =HttpClient.newBuilder().build();

2. Create the required data to be passed into the request body:

        Map<String, String> requestBody =
                    Map.of("key1", "value1", "key2", "value2");

3. Create a HttpRequest object with the request method as POST and by providing the request body data as String. We will  make use of Jackson's ObjectMapper to convert the request body, Map<String, String>, into a plain JSON String and then make use of HttpRequest.BodyPublishers to process the String request body:

        ObjectMapper mapper =newObjectMapper();
        HttpRequest request =HttpRequest
            ...