Jetty framework to build an efficient HTTP client step in Java
The Jetty framework is an open source implementation of a highly scalable Java HTTP server and client.It provides a lightweight and efficient way to build an HTTP client.The following is the steps and example code of using the Jetty framework to build an efficient HTTP client:
Step 1: Add jetty dependencies
First, Jetty dependencies need to be added to the project construction file.If you use Maven to build a project, you can add the following dependencies to the POM.XML file:
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-client</artifactId>
<version>9.4.43.v20210629</version>
</dependency>
Step 2: Create HTTPClient instance
Next, you need to create an HTTPClient instance that will be the main entrance point for communicating with the server.You can create the simplest HTTPClient instance through the following code:
import org.eclipse.jetty.client.HttpClient;
public class HttpExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
// Add http request code here
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Step 3: Create HTTP request
Once there is an HTTPClient instance, you can use it to send the HTTP request.The following is an example code that sends GET requests and get a response to the server:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.api.Response;
import org.eclipse.jetty.http.HttpMethod;
import java.util.concurrent.CompletableFuture;
public class HttpExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
// Create a get request
Request request = httpClient.newRequest("https://example.com")
.method(HttpMethod.GET);
// Send a request and get a response, use CompletableFuture to handle asynchronous operations
CompletableFuture<Response> future = request.send();
// Waiting for response and output results
Response response = future.get();
System.out.println(response.getContentAsString());
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Step 4: Processing HTTP response
You can handle the asynchronous HTTP response through the Future object.Here are a sample code for processing asynchronous requests:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.api.Response;
import org.eclipse.jetty.http.HttpMethod;
import java.util.concurrent.CompletableFuture;
public class HttpExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
Request request = httpClient.newRequest("https://example.com")
.method(HttpMethod.GET);
CompletableFuture<Response> future = request.send(new Response.CompleteListener() {
@Override
public void onComplete(Result result) {
if (result.isSucceeded()) {
Response response = result.getResponse();
// Process response, such as parsing JSON or extracting head information, etc.
System.out.println(response.getContentAsString());
} else {
result.getFailure().printStackTrace();
}
}
});
// You can perform other operations here without waiting for response
future.join (); // Make sure to be completed by waiting for response
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Through these steps, you can build an efficient HTTP client with the Jetty framework.Whether it is used to obtain an external API response or interact with the remote server, Jetty provides flexible and scalable tools to simplify the development of HTTP client.
