ASync线程中的HTTP请求

Question

我正在尝试向我的网络服务器发出http请求。这些HTTP请求的响应时间相当长。 Web服务器可能需要大约20秒才能回复。

我听说你可以在ASync线程中放置http请求，这样它们就不会挂起整个服务器20秒。

这是我的代码：

public String myFunction(Player player){
    String url = "http://domain.com/" + player.getName();
    String message = getJson(url);
    return message;
}   

public String getJson(String url){
        String msg;
        try {
            String URL = http(url);
            JsonObject jo = new Gson().fromJson(URL, JsonObject.class);
            if (jo.get("error").getAsInt() == 1) {
                return jo.get("message").getAsString();
            } else if (jo.get("error").getAsInt() == 0) {
                msg = jo.get("message").getAsString();
            } else {
                return "Fatal Error Occured (5)";
            }
        } catch (IOException e1) {
            e1.printStackTrace();
            return "Fatal Error Occured (6)";
        }
        return msg;
    }

    private String http(String string) throws IOException {
        String msg = "";
        URL obj = new URL(string);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("User-Agent", "MyAgent");
        BufferedReader in = new BufferedReader(
        new InputStreamReader(con.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
            if (msg.length() == 0) {
                msg = line;
            } else {
                msg = msg + "\n" + line;
            }
        }
        in.close();
        return msg;
    }