inputstream图片流转base64

import java.io.*;
import java.util.Base64;

public class ImageToBase64 {

    public static String convertImageToBase64(InputStream inputStream) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        byte[] imageBytes = outputStream.toByteArray();
        return Base64.getEncoder().encodeToString(imageBytes);
    }
}