当外部应用程序相互阻塞时，线程是否有效？

Question

我有两个覆盆子pi将内容从同一个路由器上传到网页，偶尔会阻止彼此访问。为了在java中防止这种情况，你通常会使用线程并同步，等待/通知以及所有这些 - 但是当应用程序不知道彼此被删除时，你怎么能这样做呢？ - 我的代码看起来像这样 - 并按预期工作。

public void sendStrings(String output) {
    String url2 = "http://myhomepage.com";

    HttpURLConnection connection = null;
    try {

        URL obj = new URL(url2);
        connection = (HttpURLConnection) obj.openConnection();
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
        connection.connect();

        OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());

        writer.write(output);
        writer.flush();
        writer.close();

        InputStream input = connection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        StringBuilder result = new StringBuilder();
        String otherLine;

        int responseCode = connection.getResponseCode();

    }

    catch (IOException e) {

    } finally {

        connection.disconnect();

    }
}