Java根据图片链接获取图片流

import sun.misc.BASE64Encoder;
import java.net.HttpURLConnection;
import java.io.InputStream;
import java.io.IOException;
import java.net.URL;
import java.io.ByteArrayOutputStream;

    public static String getPictureBase(String fileUrl){
        //获取图片流地址
        InputStream in = null;
        final ByteArrayOutputStream data = new ByteArrayOutputStream();
        //读取图片字节数组
        try {
            URL url = new URL(fileUrl);
            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;
    }