File Downloads

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.testng.annotations.Test;

import io.restassured.RestAssured;
import io.restassured.response.Response;

public class APIDemo {

	private static final Logger LOG = LoggerFactory.getLogger(APIDemo.class);

	@Test
	public void testDownload() throws IOException {

		String url = "http://ezifyautomationlabs.com:6565/educative-rest/students";

        // making API call
		Response response = RestAssured.given()
				.log().all(true)
				.get(url)
				.andReturn();

        // validating http status code
		assertEquals(response.getStatusCode(), 200, "http status code");

        // reading the response boody as byte[]
		byte[] bytes = response.getBody().asByteArray();
        // validating that the response content length > 0
		assertTrue(bytes.length > 0, "response content length is 0");

        // writing the byte[] to file
		File file = new File("students.json");
		Files.write(file.toPath(), bytes);

        // validating the existence and size of file
		assertTrue(file.exists(), "file " + file + " does not exist");
		assertTrue(file.length() > 0, "file size is 0");
        assertEquals(bytes.length, file.length(), "file size and response content");

		String content = new String(Files.readAllBytes(file.toPath()));
		LOG.info("printing content of the file => {}", content);
	}

}