网络请求数据（文本and图片）

请求文本数据

public static String getJson(String urlString) {

        try {
            
            URL url = new URL(urlString);
            //获取网络连接对象
            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
            //得到请求结果码
            int responseCode = httpConnection.getResponseCode();
            //200为访问成功，300重定向，400客户端错误，500服务器错误
            if (responseCode == 200) {
                //读取网络数据
                InputStream inputStream = httpConnection.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                BufferedReader reader = new BufferedReader(inputStreamReader);

                String readLine = "";
                String str = "";
                
                while ((readLine = reader.readLine()) != null) {

                    str += readLine;
                }

                return str;

            }


        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

请求图片

 try {
            URL url = new URL(urlBitmap);
            try {
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                int responseCode = urlConnection.getResponseCode();

                if(responseCode==200){

                    InputStream inputStream = urlConnection.getInputStream();
                    //读取地址图片，获取位图工厂
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

                    return bitmap;
                }

            } catch (IOException e) {
                e.printStackTrace();
            }


        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        return null;

外部工具类，调用即可

注意：

1. 网络权限 <uses-permission android:name="android.permission.INTERNET" />
2. 请求方法必须在子线程中，不然没数据