URL地址转base64

/**
 * 请求图片地址，返回结果进行base64编码
 * @param imgUrl
 * @return
 */
public String requestUrlToBase64(String imgUrl){
    String result = null;
    HttpURLConnection connection = null;

    try {
        URL url = new URL(imgUrl);
        connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);
        // 获取请求输入流
        InputStream inputStream = connection.getInputStream();
        // inputStream流数据转ByteArrayOutputStream
        int len = -1;
        byte[] buffer = new byte[1024];
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            out.write(buffer, 0, len);
        }

        // ByteArrayOutputStream编码成base64字符串
        result = new String(Base64.getEncoder().encode(out.toByteArray()));
        connection.disconnect();
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        if(connection != null){
            connection.disconnect();
        }
    }

    return result;
}