对用户的密码进行加密

之前网上的方法有问题，对于每次生成的加密码都是不同的，现在这个程序生成的加密字符串是相同的，

package com.huawei;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

/**
 * This program generates a AES key, retrieves its raw bytes, and then
 * reinstantiates a AES key from the key bytes. The reinstantiated key is used
 * to initialize a AES cipher for encryption and decryption.
 */

public class AES {
	
	private static final String AES = "AES";

	private static final String CRYPT_KEY = "YUUAtestYUUAtest";

	/**
	 * 加密
	 * 
	 * @param encryptStr
	 * @return
	 */
	public static byte[] encrypt(byte[] src, String key) throws Exception {
		Cipher cipher = Cipher.getInstance(AES);
		SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);
		cipher.init(Cipher.ENCRYPT_MODE, securekey);//设置密钥和加密形式
		return cipher.doFinal(src);
	}

	/**
	 * 解密
	 * 
	 * @param decryptStr
	 * @return
	 * @throws Exception
	 */
	public static byte[] decrypt(byte[] src, String key)  throws Exception  {
		Cipher cipher = Cipher.getInstance(AES);
		SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);//设置加密Key
		cipher.init(Cipher.DECRYPT_MODE, securekey);//设置密钥和解密形式
		return cipher.doFinal(src);
	}
	
	/**
	 * 二行制转十六进制字符串
	 * 
	 * @param b
	 * @return
	 */
	public static String byte2hex(byte[] b) {
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++) {
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1)
				hs = hs + "0" + stmp;
			else
				hs = hs + stmp;
		}
		return hs.toUpperCase();
	}

	public static byte[] hex2byte(byte[] b) {
		if ((b.length % 2) != 0)
			throw new IllegalArgumentException("长度不是偶数");
		byte[] b2 = new byte[b.length / 2];
		for (int n = 0; n < b.length; n += 2) {
			String item = new String(b, n, 2);
			b2[n / 2] = (byte) Integer.parseInt(item, 16);
		}
		return b2;
	}
	
	/**
	 * 解密
	 * 
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public final static String decrypt(String data) {
		try {
			return new String(decrypt(hex2byte(data.getBytes()),
					CRYPT_KEY));
		} catch (Exception e) {
		}
		return null;
	}

	/**
	 * 加密
	 * 
	 * @param data
	 * @return
	 * @throws Exception
	 */
	public final static String encrypt(String data) {
		try {
			return byte2hex(encrypt(data.getBytes(), CRYPT_KEY));
		} catch (Exception e) {
		}
		return null;
	}
	

	public static void main(String[] args) {
		String ID = "611111";
		
		String idEncrypt = encrypt(ID);
		System.out.println(idEncrypt);
		/*String idDecrypt = decrypt(idEncrypt);
		System.out.println(idDecrypt);*/
		test1();
	}
	
	public static void test1(){
		System.out.println("解密");
		String idDecrypt = decrypt("B799F92E7C3E5E29BB0BF976C49CB422");
		System.out.println(idDecrypt);
	}
	
}