Accessing REST End-point using Java HTTPClient

In this blog I will show simple code on how to access the REST End-point using Java HTTPClient.

With reference to my previous blog in this blog will show an approach to perform Integration test or access the API's of the Stock App using Java HttpClient.

• Code example with setting up headers and processing the response.

package com.stock.finance.client;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;

import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;

/*
 * Java 11 http client approach to perform integration test
 */
public class Java11HttpClient {

    @Test
    //@Disabled
    public void getEntitiesFromAPI() {

        //Create http client 
        HttpClient client = HttpClient.newHttpClient();

        // Create request - builder pattern
        HttpRequest request = HttpRequest.newBuilder().uri(URI.create("https://my-stock-boot-app.herokuapp.com/stock-app/about"))
                     .build();
        // Send request and receive response
        //Convert the response as a string, which can also be a About object - use BodyHandlers to convert
        try {
            HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
            assertEquals(200, response.statusCode());
            assertEquals(true, response.body()!= null && response.body().contains("Stock"));
        } catch (IOException | InterruptedException e ) {
            e.printStackTrace();
            assertTrue(false);
        }

    }

    public void postEntitiesFromAPI() {

        //Create http client 
        HttpClient client = HttpClient.newHttpClient();

        // Create request - builder pattern
        HttpRequest request = HttpRequest.newBuilder()
                .header("Content-Type", "application/json")
                .uri(URI.create("https://my-stock-boot-app.herokuapp.com/stock-app/about")) //upper case
                .POST(BodyPublishers.ofString("{\"username\":\"user\",\"password\":\"password\"}"))
                .build();
        // Send request and receive response
        //Convert the response as a string, which can also be a About object - use BodyHandlers to convert
        try {
            HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
            assertEquals(200, response.statusCode());
            assertEquals(true, response.body()!= null && response.body().contains("Stock"));
        } catch (IOException | InterruptedException e ) {
            e.printStackTrace();
            assertTrue(false);
        }
    }
}