Apache HttpClient远程查询

Question

我有一个运行MySQL数据库的服务器，我有一个php文件来获取用户的所有任务（我必须通过POST给它的用户名），然后它返回一个JSON与查询的结果。

在我的应用程序中，我使用Apache HttpClient库来制作连接，但我似乎无法找到如何将我想要的用户名传递给php文件。

这是我的PHP文件：

<?php
$encargado = $_POST['encargado'];

$host_name  = "falseHost";
$database   = "db";
$user_name  = "merlin";
$password   = "123";

$connect = mysqli_connect($host_name, $user_name, $password, $database);

$select = "SELECT * from tasker WHERE encargado ='$encargado' AND visible = 1 ORDER BY fecha";

$result = $connect->query($select);

$rows = array();

while($r = mysqli_fetch_assoc($result)) {
    $rows[] = $r;

}

echo json_encode($rows);

$connect->close();
?>

在我的Java类中，我成功地检索了一个简单查询的结果（不需要任何POST参数）

这是我的Java类：

public class Conector {


    static CloseableHttpClient httpclient = HttpClients.createDefault();


    //Devuelve un ArrayList con todos los username registrados
    public List<String> obtenerUsuarios() throws ClientProtocolException, IOException{

        List<String> listUserName = new ArrayList<>();

        try {
            HttpGet httpGet = new HttpGet("https://falsa.com/aplicaciones/f/select_users.php");
            CloseableHttpResponse response1 = httpclient.execute(httpGet);

            try {
                HttpEntity entity1 = response1.getEntity();
                String json = IOUtils.toString(entity1.getContent(), "UTF8");        
                Gson gson = new Gson(); // Or use new GsonBuilder().create();
                Type collectionType = new TypeToken<Collection<User>>(){}.getType();
                List<User> usuarios = (List<User>) new Gson()
                        .fromJson( json , collectionType);

                for(User user: usuarios) {
                    listUserName.add(user.getUsername());
                }

                EntityUtils.consume(entity1);
            } finally {
                response1.close();
            }


        } finally {
            httpclient.close();
        }
        return listUserName;
    }

    public List<Task> obtenerTareas(){


        List<Task> obtenerTareas = new ArrayList<>();
        try {
            HttpPost httpPost = new HttpPost("https://falsa.com/aplicaciones/f/select_tasks.php");
            CloseableHttpResponse response1 = httpclient.execute(httpPost);

            try {
                HttpEntity entity1 = response1.getEntity();
                String json = IOUtils.toString(entity1.getContent(), "UTF8");        
                Gson gson = new Gson(); // Or use new GsonBuilder().create();
                Type collectionType = new TypeToken<Collection<Task>>(){}.getType();
                List<Task> usuarios = (List<Task>) new Gson()
                        .fromJson( json , collectionType);

                for(User user: usuarios) {
                    obtenerTareas .add(user.getUsername());
                }

                EntityUtils.consume(entity1);
            } finally {
                response1.close();
            }


        } finally {
            httpclient.close();
        }



        return null;

    }


}