java AES/ECB/None解密

在对接车辆识别时，出现车牌加密的问题，需要解密，在网上找了N个方法，最后加上自己的摸索，成功生成java版本AES/ECB/None的解密工具，现分享给需要的人

package io.renren.util;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.util.Base64;
import java.util.Random;

/**
 * AES加密工具类
 */
public class AESUtil {


    /**
     * 加密Key 需要16位 可用数字与字母组成
     */
    private static String key = "1234567898765432";
    /**
     * 偏移量 需要16位
     */
    private static String iv = "4w2Df1xSj5ff662d";

    private static Logger log = LoggerFactory.getLogger(AESUtil.class);

    private static Base64.Decoder decoder;

    private static Base64.Encoder encoder;



    static {
        decoder = Base64.getDecoder();
        encoder = Base64.getEncoder();
    }



    public static String getSixteenBitString(){
        StringBuffer sb = new StringBuffer();
        String[] chars = new String[]{
                "1","2","3","4","5","6","7","8","9","a","b",
                "c","d","e","f","g","h","i","j","k","l","m",