我一直在我的春季启动程序上获得此IOException错误消息。

Question

@GetMapping("/check")
    public String checkURL(@RequestParam String url) {
        String returnMessage = "";

        try {
            URL urlObj = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();

            conn.connect();
            conn.setRequestMethod("GET");
            
            
            int responseCode = conn.getResponseCode() / 100;

            conn.disconnect();

            if (responseCode != 4 || responseCode != 3) {
                returnMessage = siteStatus + " UP AND RUNNING";
            } else {
                returnMessage = siteStatus + " DOWN!";
            }

        } catch (MalformedURLException e) {

            return siteStatus + " incorrect. Please try again.";
        } catch (IOException e) {
                        returnMessage = e.getMessage();
        }
        return returnMessage;
    }

如果有人可以帮助我解决此问题，则此错误显然是由于IOException所致。我检查了URL有效。我转到Localhost：8080/check？url = https：//www.example.com。我很确定语法是正确的。我什至做conn.disconnect（）以删除连接，但我一直遇到错误。