Java에서 JSON 데이터로 HTTP POST 요청을 수행하는 방법은 무엇입니까?

// Obtain Apache HttpClient library
HttpClient httpClient = HttpClientBuilder.create().build();
try {
    // Create HTTP POST request
    HttpPost request = new HttpPost("http://yoururl");
    // Set content type header
    request.addHeader("content-type", "application/x-www-form-urlencoded");
    // Create JSON string entity
    StringEntity params = new StringEntity("details={\"name\":\"xyz\",\"age\":\"20\"} ");
    // Set request entity
    request.setEntity(params);
    // Execute HTTP request
    HttpResponse response = httpClient.execute(request);
} catch (Exception ex) {
    // Handle any exceptions
} finally {
    // Close HTTP connection
}