将OSS上保存的图片转为Base64字符串

导入须要的包:

import java.io.*;
import sun.misc.BASE64Encoder;
import java.net.HttpURLConnection;

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使用Java根据oss上保存图片的地址转为Base64编码

private String getBase64(String url) {
        InputStream in = null;
        final ByteArrayOutputStream data = new ByteArrayOutputStream();
        //读取图片字节数组
        try {
            URL url = new URL(url);
            final byte[] by = new byte[1024];
            // 建立连接获取图片
            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;
    }