Android通过原生请求直接获取网页内容

String requestUrl = "http://119.29.29.29/d?dn=www.baidu.com";// 新建一个URL对象
URL url = new URL(requestUrl);// 打开一个HttpURLConnection连接
StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();// 设置连接主机超时时间
                  urlConn.setConnectTimeout(5 * 1000);//设置从主机读取数据超时
                  urlConn.setReadTimeout(5 * 1000);// 设置是否使用缓存  默认是true
                  urlConn.setUseCaches(true);// 设置为Post请求
                  urlConn.setRequestMethod("GET");//urlConn设置请求头信息
                  urlConn.setRequestProperty("Content-Type", "application/json");
                  //设置客户端与服务连接类型
                  urlConn.addRequestProperty("Connection", "Keep-Alive");
                  urlConn.connect();            // 开始连接
            // 判断请求是否成功
            if (urlConn.getResponseCode() == 200) {
                String result = streamToString(urlConn.getInputStream());//获取的内容
                WriteLog.writeTxtToFile(AppTimeUtils.formatDate(new Date()) + "：" + "GetIP url=result=>"+result);
                String[] ipArr = result.split(";");
                if (2 == ipArr.length && !"0".equals(ipArr[0])) { 
                // 通过HTTPDNS获取IP成功，进行URL替换和HOST头设置
                    String ip = ipArr[0];
                    oldip="tcp://"+ip+":1883";
                }
            }
                  urlConn.disconnect();

private static String streamToString(InputStream is) {
    try {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = is.read(buffer)) != -1) {
            baos.write(buffer, 0, len);
        }
        baos.close();
        is.close();
        byte[] byteArray = baos.toByteArray();
        return new String(byteArray);
    } catch (Exception e) {
        Log.e(TAG, e.toString());
        return null;
    }
}