URL下载网络资源

public class URLDown {

    public static void main(String[] args) throws Exception{
        //1.下载地址
        URL url = new URL("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1599218101743&di=2b711810ec59e46639bf70c16b7c357a&imgtype=0&src=http%3A%2F%2Fimage.codes51.com%2Farticle%2Fimage%2F20170407%2F20170407100716_7758.jpg");

        //2.连接到这个资源
        HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();

        //3.读取数据
        InputStream inputStream = httpURLConnection.getInputStream();
        FileOutputStream fileOutputStream = new FileOutputStream("7758.jpg");
        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer)) != -1) {
            fileOutputStream.write(buffer,0,len);
        }

        //4.关闭流
        fileOutputStream.close();
        inputStream.close();
        httpURLConnection.disconnect();
    }

}