记一次AES解密失败

在java中不能用PKCS7Padding的填充方式，遂解密会失败，改为PKCS5Padding。

AES/CBC/PKCS5Padding加解密

public class AesCBC {
    /*
     * 加密用的Key 可以用26个字母和数字组成
     * 此处使用AES-128-CBC加密模式，key需要为16位。
     */
    private static String sKey="";
    private static String ivParameter="";
    private static AesCBC instance=null;
    private AesCBC(){

    }
    public static AesCBC getInstance(){
        if (instance==null)
            instance= new AesCBC();
        return instance;
    }
    // 加密
    public String encrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes(encodingFormat));
        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
    }

    // 解密
    public String decrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        try {
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original,encodingFormat);
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        // 需要加密的字串
        String cSrc = "我来自中国";
        System.out.println(cSrc);
        // 加密
        long lStart = System.currentTimeMillis();
        String enString = AesCBC.getInstance().encrypt(cSrc,"utf-8",sKey,ivParameter);
        System.out.println("加密后的字串是："+ enString);

        long lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("加密耗时：" + lUseTime + "毫秒");
        // 解密
        lStart = System.currentTimeMillis();
        String DeString = AesCBC.getInstance().decrypt(enString,"utf-8",sKey,ivParameter);
        System.out.println("解密后的字串是：" + DeString);
        lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("解密耗时：" + lUseTime + "毫秒");
    }

}