图片oss链接地址生成base64

废话不多说直接上代码 
public static String getBase64(String ossUrl) {
    InputStream in = null;
    final ByteArrayOutputStream data = new ByteArrayOutputStream();
    //读取图片字节数组
    try {
        URL url = new URL(ossUrl);
        final byte[] by = new byte[1024];
        // 创建链接获取图片
        final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5000);
        in = conn.getInputStream();
        int len = -1;
        while ((len = in.read(by)) != -1) {
            data.write(by, 0, len);
        }
        in.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    //对字节数组Base64编码
    BASE64Encoder encoder = new BASE64Encoder();
    //返回Base64编码过的字节数组字符串
    String encode = encoder.encode(data.toByteArray());
    encode = encode.replaceAll("[\\s*\t\n\r]", "");
    return encode;
}