Jetty Extra :: Asynchronous HTTP Client's technical principles and its advantages in the Java library
Jetty Extra is an extended module of the Jetty server, which contains Asynchronous HTTP Client framework.This article will explore the technical principles of the framework and its advantages in the Java class library.
Technical principle:
ASYNCHRONOUS HTTP Client framework is a non -plug -in network communication model based on event -driven.It uses Java NIO (New I/O) technology to use a small number of threads to process a large number of concurrent I/O operations.The core feature of the framework is to support asynchronous HTTP requests and response processing, and achieve it through the callback mechanism.
In the asynchronous HTTP Client framework, one or more HTTPClient can be created, and each instance can send HTTP requests asynchronously and receive response.By putting the request into the queue, the framework can process multiple requests in one thread.The actual network communication is completed by Jetty's Nio Connector, which uses Java Nio to achieve non -blocking network I/O.
When sending HTTP requests, you can set the requested URL, method, request header and other parameters.You can choose to send requests synchronous or asynchronous ways.For asynchronous requests, the response can be processed by setting a callback function for the request.When the response returns, the callback function will be triggered, which can process and parse the response data in it.
advantage analysis:
1. High performance: Using non -blocking I/O and event driving models, ASYNCHRONOUS HTTP Client can handle a large number of concurrent requests, reduce the creation and destruction of threads, and improve the performance and throughput of the server.
2. Ejaculation: Because a small amount of threads are used to process concurrent requests, the framework can effectively expand when facing a large number of concurrent requests, and will not cause the depletion of thread resources.
3. Asynchronous processing: Sending and processing HTTP requests through asynchronous ways can make full use of network resources to improve the concurrentness and response capabilities of the system.
4. Flexibility: Asynchronous HTTP Client's framework provides a wealth of configuration options, which can be customized according to actual needs.It can set parameters such as timeout, connection pool size, agent, etc. to meet different application scenarios.
The following is an example code and related configuration using Jetty Extra's ASYNCHRONOUS HTTP Client framework:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.*;
import java.util.concurrent.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class AsyncHttpClientExample {
public static void main(String[] args) throws Exception {
// Create HTTPCLIENT instance
HttpClient httpClient = new HttpClient();
httpClient.start();
// Create asynchronous requests
Request request = httpClient.newRequest("http://example.com/")
.method(HttpMethod.GET);
// Send asynchronous request
request.send(new Response.CompleteListener() {
@Override
public void onComplete(Result result) {
// Treatment response
if (result.isFailed()) {
System.out.println ("Request failure:" + Result.getFailure ());
} else {
System.out.println ("Successful request:" + Result.getResponse ());
}
}
});
}
}
In the above example, we first created an HTTPClient instance and started it.We then created an asynchronous request to set the URL and method of requests.Next, we sent asynchronous requests through the send method and handled the response results in the callback function.
It should be noted that in actual use, you can also make more configurations of HTTPClient, such as setting up connection timeout time and connection pool size.
Summarize:
Asynchronous HTTP Client's framework is a high -performance, retractable and flexible network communication framework. Its technical principles are based on non -blocking I/O and event drive models.The use of this framework in the Java library can improve the concurrentness and response capabilities of the system, and effectively handle a large number of concurrent requests.By cooperating with the Jetty server, a powerful asynchronous HTTP client function can be achieved.
