import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import com.fasterxml.jackson.databind.ObjectMapper;

public class HotelTradeSearchTest {
	
	public static void main(String[] args) throws IOException {

		sendPOST();
		System.out.println("POST DONE");
	}

	private static void sendPOST() throws IOException {
		URL obj = new URL("https://docs-search.hoteltrader.com/graphql");
		HttpURLConnection con = (HttpURLConnection) obj.openConnection();
		con.setRequestMethod("POST");
		con.setRequestProperty("Content-Type", "application/json");

		// For POST only - START
		con.setDoOutput(true);
		OutputStream os = con.getOutputStream();
		os.write(
				("{\n"
				+ "\n"
				+ "    \"operationName\":\"getPropertiesByCity\",\n"
				+ "    \"variables\":{\n"
				+ "        \"searchCriteriaByCity\":{\n"
				+ "            \"city\":\"New York, New York, United States Of America\",\n"
				+ "            \"occupancies\":[\n"
				+ "                {\n"
				+ "                    \"checkInDate\":\"2022-06-01\",\n"
				+ "                    \"checkOutDate\":\"2022-06-02\",\n"
				+ "                    \"numberOfAdults\":2,\n"
				+ "                    \"numberOfChildren\":0,\n"
				+ "                    \"childrenAges\":\"\"\n"
				+ "                }\n"
				+ "            ]\n"
				+ "        }\n"
				+ "    },\n"
				+ "    \"query\":\"query getPropertiesByCity($searchCriteriaByCity: SearchCriteriaByCityInput) {\\n getPropertiesByCity(searchCriteriaByCity: $searchCriteriaByCity) {\\n properties {\\n propertyId\\n propertyName\\n occupancies {\\n occupancyRefId\\n checkInDate\\n checkOutDate\\n numberOfAdults\\n numberOfChildren\\n childrenAges\\n }\\n rooms {\\n occupancyRefId\\n htIdentifier\\n roomName\\n shortDescription\\n longDescription\\n rateInfo {\\n bar\\n binding\\n commissionable\\n commissionAmount\\n currency\\n netPrice\\n tax\\n grossPrice\\n payAtProperty\\n dailyPrice\\n dailyTax\\n taxInfo {\\n payAtBooking {\\n date\\n name\\n description\\n value\\n }\\n payAtProperty {\\n date\\n name\\n description\\n value\\n }\\n }\\n }\\n mealplanOptions {\\n breakfastIncluded\\n lunchIncluded\\n dinnerIncluded\\n allInclusive\\n mealplanDescription\\n }\\n rateplanTag\\n refundable\\n cancellationPolicies {\\n startWindowTime\\n endWindowTime\\n cancellationCharge\\n timeZone\\n }\\n }\\n shortDescription\\n longDescription\\n city\\n latitude\\n longitude\\n starRating\\n hotelImageUrl\\n }\\n }\\n}\\n\"\n"
				+ "\n"
				+ "}").getBytes()
				);
		os.flush();
		os.close();
		// For POST only - END

		int responseCode = con.getResponseCode();
		System.out.println("POST Response Code :: " + responseCode);

		if (responseCode == HttpURLConnection.HTTP_OK) { // success
			BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
			String inputLine;
			StringBuffer response = new StringBuffer();

			while ((inputLine = in.readLine()) != null) {
				response.append(inputLine);
			}
			in.close();

			ObjectMapper mapper = new ObjectMapper();
			System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(mapper.readTree(response.toString())));
			
		} else {
			System.out.println("POST request not worked");
		}
	}
}

		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.11.2</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.11.2</version>
		</dependency>