java基础知识——JAVA中三种URL连接方法

/*

            *   方法一

            *     

           URL url = new URL("http://www.sina.com.cn");

           URLConnection urlcon = url.openConnection();

            urlcon.connect();

           InputStream is = urlcon.getInputStream();

            */

   /*

            * 方法二

            *

            * URL url = new URL("http://www.yhfund.com.cn");

           HttpURLConnection urlcon = (HttpURLConnection)url.openConnection();

             urlcon.connect();
           InputStream is = urlcon.getInputStream();

            */

/*

            * 方法三

            * URL url = new URL("http://www.yhfund.com.cn");

           InputStream is = url.openStream();

            */