String length must be a multiple of four.

import org.apache.commons.codec.binary.Base64;

public class Base64Tool {

    /**
     * 字节数组转Base64编码
     */
    public static String byteToBase64(byte[] bytes) {
        return new String(Base64.encodeBase64(bytes));
//        return Base64.byteArrayToBase64(bytes);
    }

import org.apache.commons.codec.binary.Base64;

import com.alibaba.druid.util.Base64;   报错String length must be a multiple of four.