spring-boot2+ integrate with okhttp3 and AsyncHttpClient

OKHttp3

add below to pom.xml

<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>3.11.0</version>
</dependency>

java code

import java.util.concurrent.TimeUnit;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import okhttp3.OkHttpClient;

@Configuration
public class OkHttpConfig {
	// strong recommend to use singleton
	@Bean
	public OkHttpClient okHttpClient() {
		OkHttpClient okHttpClient = new OkHttpClient.Builder()
				.connectTimeout(2000, TimeUnit.MILLISECONDS)
				.readTimeout(3000, TimeUnit.MILLISECONDS)
				.writeTimeout(3000, TimeUnit.MILLISECONDS)
				.build();
		return okHttpClient;
	}
}

how to use

@Autowired
private OkHttpClient okHttpClient;

@Test
public void invokeRemoteAPI() throws Exception {
	String url = "http://host:port/api";
	Request request = new Request.Builder().url(url).build();
	Response response = okHttpClient.newCall(request).execute();
	String result = response.body().string();
	System.out.println(result);
}

AsyncHttpClient

add below to pom.xml

<dependency>
    <groupId>com.ning</groupId>
    <artifactId>async-http-client</artifactId>
    <version>1.9.40</version>
</dependency>

java code

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.ning.http.client.AsyncHttpClient;
import com.ning.http.client.AsyncHttpClientConfig;

@Configuration
public class AsyncHttpClientBootConfig {
	@Bean
	public AsyncHttpClient asyncHttpClient() {
		AsyncHttpClientConfig.Builder builder = new AsyncHttpClientConfig.Builder()
				.setRequestTimeout(5000)
				.setConnectTimeout(2000)
				.setReadTimeout(3000);
		return new AsyncHttpClient(builder.build());
	}
}

how to use

@Autowired
private AsyncHttpClient asyncHttpClient;

@Test
public void invokeRemoteAPI() throws Exception {
	String url = "http://host:port/api";
	Request request = new RequestBuilder().setUrl(url).build();
	Future<Response> responseFuture = asyncHttpClient.executeRequest(request);
	try {
		Response response = responseFuture.get();
		String result = response.getResponseBody();
		System.out.println(result);
	} catch (Exception e) {
		e.printStackTrace(); // TODO 
	}
}