The application instance (Application Examples of the HTTP4S JDK HTTP Client Framework in Java Development)
HTTP4S is a framework for constructing asynchronous, high -performance, type secure web services. It uses the HTTP client that comes with JDK, providing a simple and flexible API.
Example 1: Send GET request
import org.http4s.*;
import org.http4s.client.*;
import org.http4s.core.*;
import org.http4s.dsl.io.*;
import org.http4s.headers.*;
import org.http4s.implicits.*;
import org.typelevel.ci.*;
import java.net.URI;
public class Http4sExample {
public static void main(String[] args) {
// Create an HTTP client
Resource<ClientConnectionManager, HttpClient> clientResource = JavaNetClientBuilder.create().resource();
// Construct a GET request
Request<IO> getRequest = Request.GET(URI.create("https://example.com"));
// Synchronize the GET request, get the response
Response<IO> response = clientResource.use(client ->
client.expect(GetRequest.newBuilder(getRequest)
.header(Accept.Language.apply(LanguageTag.parse("zh-CN")))
.header(UserAgent.apply(ProductId.fromCompactForm("http4s-example/1.0")))
.build())
).unsafeRunSync();
// Treatment response
if (response.status().equals(Status.OK)) {
System.out.println ("Get requests successfully!");
System.out.println(response.asString().unsafeRunSync());
} else {
System.out.println ("Get request failed!");
}
}
}
Example 2: Send post request
import org.http4s.*;
import org.http4s.client.*;
import org.http4s.core.*;
import org.http4s.dsl.io.*;
import org.http4s.headers.*;
import org.http4s.implicits.*;
import org.typelevel.ci.*;
import java.net.URI;
public class Http4sExample {
public static void main(String[] args) {
// Create an HTTP client
Resource<ClientConnectionManager, HttpClient> clientResource = JavaNetClientBuilder.create().resource();
// Construct a post request
Request<IO> postRequest = Request.POST(URI.create("https://example.com"))
.with(Entity.text("This is a POST request."));
// Send a post request asynchronous and get a response
Response<IO> response = clientResource.use(client ->
client.expect(PostRequest.newBuilder(postRequest)
.header(Accept.Language.apply(LanguageTag.parse("zh-CN")))
.header(UserAgent.apply(ProductId.fromCompactForm("http4s-example/1.0")))
.build())
).unsafeRunSync();
// Treatment response
if (response.status().equals(Status.OK)) {
System.out.println ("POST requesting success!");
System.out.println(response.asString().unsafeRunSync());
} else {
System.out.println ("Post request failed!");
}
}
}
Through the above example, we can see the application of the HTTP4S JDK HTTP Client framework in Java development.You can use it to send GET requests and post requests and deal with response.It provides a simple and flexible API to help developers build high -performance web services.
