Apache httpclient Fluent API framework detailed explanation
Apache HTTPCLIENT FLUENT API is a auxiliary framework for Apache HttpClient, which provides a more concise and easier way to execute HTTP requests.It uses a smooth method chain (Fluent API) to build and send HTTP requests and deal with response.
First, we need to add Apache HttpClient Fluent API to the Java project.In the Maven project, you can add the following dependencies to the pom.xml file:
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>fluent-hc</artifactId>
<version>4.5.13</version>
</dependency>
Next, we can use Fluent API to build an HTTP request.The following is a simple example, which is used to send a GET request and obtain the response content:
import org.apache.http.client.fluent.Request;
import org.apache.http.client.fluent.Response;
import org.apache.http.util.EntityUtils;
public class HttpClientFluentAPIExample {
public static void main(String[] args) {
try {
Response response = Request.Get("http://example.com")
.execute();
String content = EntityUtils.toString(response.returnResponse().getEntity());
System.out.println(content);
} catch (Exception e) {
e.printStackTrace();
}
}
}
The above code creates an object of `Request`, and uses the` Get` method to specify the URL of the Get request to be sent.Then, use the `Execute` method to send a request and get a response.Finally, the response entity is converted into string with the `EntityUtils.TOSTRING method.
In addition to sending GET requests, the Fluent API also supports other request methods, such as POST, PUT, Delete, etc.You can set various parameters of requests in a chain call, such as setting the request header, query parameter, request body, etc.
Fluent API can also be used to deal with response.For example, you can use the method of the response to use the method of `Response.returnContent (), and then convert it to a string with the` EntityUtils.Tostring` method.You can also obtain information such as the status code and response header.
In summary, Apache HTTPClient Fluent API provides a more concise and easier way to execute HTTP requests.By using the smooth method chain, we can easily build and send various types of requests and processes the response.It is suitable for various HTTP request scenarios and is very common in Java development.
I hope this article can help you understand Apache HttpClient Fluent API and play a certain guiding role in actual projects.
