Java中如何使用HttpURLConnection请求指定URL并返回字符串呢?

下文笔者讲述HttpURLConnection获取请求URL并返回字符串的方法分享，如下所示

实现思路:
    1.使用URL对象的openConnection即可返回一个HttpURLConnection对象
	2.使用HttpURLConnection对象的getInputStream()方法即可返回读取的BufferedReader

例:
编写HttpURLConnection读取URL的示例

 private static String readUrl(String urlvalue) {
        String inputLine = "";

        try {
            URL url = new URL(urlvalue);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection
                .getInputStream()));
            inputLine = in.readLine().toString();
        } catch (Exception e) {
            e.printStackTrace();
            inputLine = "";
        }

        return inputLine;
    }