从arrayList加载uri字符串时，格式错误的url异常无协议

Question

当我对一个URI进行硬编码时，它起作用，但是当我尝试遍历数组时，我得到了格式错误的URL异常。

我知道附有协议。我尝试在代码的不同位置添加和删除“”。我使用一个URI来运行它以确保其正常运行。我打印了行以查看URI是什么，以确保它们正确输出。

/**
 * Convert a URI into a JSON string
 * 
 * @param URI the URI of resource
 * @return String String format of JSON object in an array
 * @throws URISyntaxException 
 * @throws Exception
 */
private static String readUrl(ArrayList<String> urlStrings) throws Exception, IOException, URISyntaxException {
    String inputLine = "";
    String finalInput = "";
    int i;
     for(i = 0;i<urlStrings.size();) {
           System.out.println(urlStrings.size());
           System.out.println(urlStrings.get(i));
        if (urlStrings.get(i).contains("WADL") || urlStrings.get(i).contains("wadl") || urlStrings.get(i).contains("WSDL") || urlStrings.get(i).contains("wsdl")) {

            return null;
        }

        // Create a trust manager that does not validate certificate chains
        TrustManager[] trustAllCerts = new TrustManager[]{
                new X509TrustManager() {
                    public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }

                    public void checkClientTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }

                    public void checkServerTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }
                }
        };

        // Install the all-trusting trust manager
        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
            System.out.println("Error" + e);
        }


        BufferedReader in = null;
        String uri = urlStrings.get(i);
        URL url = new URL(uri);
        try {

            URLConnection connection = url.openConnection();

            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);

            connection.connect();

            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));



            while ((inputLine = in.readLine()) != null) {
                 //create one JSON object of all endpoints
                finalInput += inputLine;
            }
            System.out.println("Successfully processed: " + uri);
            System.out.println(finalInput);
            i++;
            return finalInput + "\n";
        }
        catch(IOException e) {
            System.out.println("Cannot read: " + uri);
            return null;
        }
        finally {
            if (in != null)
                in.close();
        }
}
     i++;
         //return JSON object to service catalog
        return finalInput;

}

希望我可以遍历数组，调用所有端点，并构建一个JSON对象以返回前端。