Java HttpClient: Usage Guide

HttpClient is an open-source Java library used for sending HTTP requests and handling responses.

Here are the basic steps for using HttpClient:

1. Import the HttpClient library.
2. The code includes imports for various Apache HTTP client classes such as HttpClient, HttpGet, HttpPost, CloseableHttpResponse, CloseableHttpClient, HttpClientBuilder, and EntityUtils.
3. Instantiate a HttpClient.
4. An HttpClient is created and built using HttpClientBuilder.
5. Instantiate an HTTP request object, such as HttpGet or HttpPost.
6. Create a new HttpGet object with the URL “http://www.example.com” and a new HttpPost object with the same URL.
7. Send an HTTP request and receive a response.
8. The httpClient sends a request to the server using a GET method and receives a response that can be closed.
9. Handle the response.
10. Retrieve the status code and response body from the HTTP response.
11. Close the response and HttpClient.
12. Close the response and the HTTP client.

The above is a basic usage guide, you can perform more operations according to your needs, such as adding request headers or setting request parameters.