在Java中通过HttpURLConnection发送HTTP POST请求不起作用

我想将一些数据发送到我的一个测试页面，并接收由服务器执行的页面。我当前的结果 = 服务器没有返回任何内容。使用的 HTML 表单：

<form action = "s.php" method = "post">
        <input type = "text" name = "test" />
        <input type = "submit" />
    </form>

S.php - 应该处理前面提到的表单中的数据的脚本：

 <? echo $_POST["test"] ?>

所以我想接收带有"测试"文本字段值的源代码。为此编写的 Java 代码：

package nettests;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
class NetTests
{
    public static void main(String args[]) throws IOException {
       URL targetURL = new URL("http://lerain.tode.cz/s.php");
       HttpURLConnection conn = (HttpURLConnection)targetURL.openConnection();
       //data send via POST request
       String data = "test=someData";
       conn.setDoOutput(true);
       conn.setInstanceFollowRedirects(true);
       conn.setRequestMethod("POST");
       conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
       conn.setRequestProperty("charset", "UTF-8");
       conn.setRequestProperty("Content-Length", Integer.toString(
        data.length()));
       conn.setUseCaches(false);
       try(OutputStreamWriter out = new OutputStreamWriter(
                                conn.getOutputStream()))
       {
            out.write(data);
       } 
       //reading code after POST request (here I want to have value from "test" field
       try(BufferedReader in = new BufferedReader(new InputStreamReader(        
        conn.getInputStream())))
       {
           String currentLine;
           while((currentLine = in.readLine()) != null)
           {
               System.out.println(currentLine);
           }
       }

 }
 }

有人可以帮忙吗？谢谢（对不起英语不好，不是我的母语:)）

编辑：已解决