根据地址请求图片并转成Base64编码

使用HttpUrlConnection请求图片, 把获取的流数据转成Base64字符串

工具类

/**
	 * 请求图片地址, 返回的结果进行base64编码
	 * 
	 * @param imgUrl 图片地址
	 * @return
	 */
	public static 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;
	}