java 使用AES解密报这个异常,字面理解很容易,就是解密的字符串的数组必须是16的倍数

package com.symmetric.aes;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
public class TestAES2 {
 private static final String enType_AES = "AES";
 private static final String pathStr = "D://aes.key";
 private static final String testStr = "AES tips you shoutld try again";
 public static void main(String[] args) {
		SecretKey genSecretKey = testGenerateKey();
		String string = genSecretKey.toString();
//		byte[] testEncryptBytes = testEncryptBytes(testStr, genSecretKey);
//		String testDecode = testDecrptBytes(testEncryptBytes, genSecretKey);
//		System.out.println(testDecode);  //直接操作数组,加密解密正常
		String testEncrypt = testEncrypt(testStr, genSecretKey);
		String testDecode2 = testDecrpt(testEncrypt, genSecretKey);
		System.out.println(testDecode2);
	 * 生成密钥
	 * 通过传递SecureRandom对象进行初始化
	 * 不指定种子或密钥
	 * @return
 public static SecretKey testGenerateKey(){	
          SecretKey genSecretKey = null;
 try {
			KeyGenerator kGenerator = KeyGenerator.getInstance(enType_AES);
			SecureRandom sRandom = new SecureRandom();
			kGenerator.init(sRandom);//不使用种子,每次生成的都不同
			genSecretKey = kGenerator.generateKey();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
 return genSecretKey;
	 * @param str
	 * @param genSecretKey	 
         * @return
 public static byte[] testEncryptBytes(String str,SecretKey genSecretKey){
 byte encrypt [] = null;
 try {
			Cipher cipher = Cipher.getInstance(enType_AES);
			cipher.init(Cipher.ENCRYPT_MODE, genSecretKey);//加密模式,密钥
 //cipher.update(str.getBytes());
			encrypt = cipher.doFinal(str.getBytes());
		} catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException | IllegalBlockSizeException | BadPaddingException e) {
			e.printStackTrace();
 return encrypt;
 public static String testEncrypt(String str,SecretKey genSecretKey){
 byte[] testEncryptBytes = testEncryptBytes(str, genSecretKey);
		System.out.println(Arrays.toString(testEncryptBytes));
		System.out.println("加密后的数组长度"+testEncryptBytes.length);
 return (new String(testEncryptBytes));
	 * @return
 public static String testDecrptBytes(byte[] bytes,SecretKey genSecretKey){
		String decoderStr = null;
 try {
			Cipher cipher = Cipher.getInstance(enType_AES);
			cipher.init(Cipher.DECRYPT_MODE, genSecretKey);//解密模式
 //cipher.update(str.getBytes());
 byte[] doFinal = cipher.doFinal(bytes);
			decoderStr = new String(doFinal);
		} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
			e.printStackTrace();
 return decoderStr;