Java呼叫外部介面的方法，最終返回介面return的資訊

        String strURL = "這裡是你要呼叫的介面地址";
        URL url = new URL(strURL);
        HttpURLConnection httpConn = (HttpURLConnection)
                url.openConnection();
        httpConn.setRequestMethod("GET");
        httpConn.connect();

        BufferedReader reader = new BufferedReader(new InputStreamReader(
                httpConn.getInputStream()));
        String line;
        StringBuffer buffer = new StringBuffer();
        while ((line = reader.readLine()) != null) {
            buffer.append(line);
        }
        reader.close();
        httpConn.disconnect();

        System.out.println(buffer.toString());
 

最終這裡buffer.toString();就是介面return的值