/**

 * 图片大于102*126就调整为102*126

 * @param base64String

 * @return

 * @throws IOException

 */

private String changePicSize(String base64String) throws IOException {

    byte[] bs = Base64.getDecoder().decode(base64String);

    InputStream input = new ByteArrayInputStream(bs);

    Image bi = ImageIO.read(input);

    if (bi.getWidth(null) > 102 || bi.getHeight(null) > 126) {

        System.out.print("压缩\t");

        BufferedImage tag = new BufferedImage(102, 126, BufferedImage.TYPE_INT_RGB);

        tag.getGraphics().drawImage(bi, 0, 0, 102, 126, null);

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        ImageIO.write(tag, "PNG", out);

        byte[] byt = out.toByteArray();

        out.close();

        bi.flush();

        input.close();

        return Base64.getEncoder().encodeToString(byt);

    }else{

        System.out.print("不压缩\t");

        bi.flush();

        input.close();

        return base64String;

    }

}