如何使用Httpurlconnection将帖子数据发送到网站

Question

我写了一个接收数据的代码，但我不知道如何将发布数据发送到服务器。

package com.company;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
    URL url;
    HttpURLConnection conn;

    try{
        url=new URL("http://mysite/create.php");

        String param="name=" + URLEncoder.encode("hello","UTF-8");

        conn=(HttpURLConnection)url.openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");

        conn.setFixedLengthStreamingMode(param.getBytes().length);
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        PrintWriter out = new PrintWriter(conn.getOutputStream());
        out.print(param);
        out.close();

        String response= "";

        Scanner inStream = new Scanner(conn.getInputStream());

        while(inStream.hasNextLine())
            response+=(inStream.nextLine());

    }
    catch(MalformedURLException ex){


    }
    catch(IOException ex){


    }
}

}

但执行它时没有反应。我正在运行IntelliJ Jetbrains IDE。