HttpURLConnection

        在Android上发送HTTP请求一般有两种一种是HttpURLConnection，另一种是HttpClinet,由于httpClient存在API数量过多，扩展困难等缺点，不建议使用，并且在Android6.0系统中被移除。

        以下是介绍HttpURLConnection的使用方法。

private void sendRequestWithHttp() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection httpURLConnection = null;
                BufferedReader reader = null;
                try {
                    URL url = new URL("http://www.baidu.com");//传入网络地址
                    httpURLConnection = (HttpURLConnection) url.openConnection();//
                    httpURLConnection.setRequestMethod("GET");//GET 获取数据
                    httpURLConnection.setConnectTimeout(8000);//链接超时时间
                    httpURLConnection.setReadTimeout(8000);//传递数据超时
                    InputStream inputStream = httpURLConnection.getInputStream();//获取数据流

                    //发送
//                    httpURLConnection.setRequestMethod("POST");
//                    DataOutputStream dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream());
//                    dataOutputStream.writeBytes("usename=admin&pass=123");

                    //读取数据
                    reader = new BufferedReader(new InputStreamReader(inputStream));//
                    StringBuffer stringBuffer = new StringBuffer();
                    String line = "";
                    while ((line = reader.readLine()) != null) {
                        stringBuffer.append(line);
                    }
                    showResponse(stringBuffer.toString());
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

新建一个子线程是因为获取网络数据属于耗时操作，所以需要在子线程中进行，

private void showResponse(final String toString) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            tv.setText(toString);
            Log.d("TAGT", "toString: " + toString);
        }
    });
}

通过runOnUiThread将子线程切换到主线程中去更新UI，Android不允许在子线程中更新UI 。

转发表明出处：https://blog.youkuaiyun.com/qq_35698774/article/details/107307473

点击下载源码

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感谢：郭霖的《第一行代码 第二版》