java实现AES对称加密

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import constants.newr.Constants;

/**
* AES
* @author
* @version
*/
public class AES {

private static final String AES = "AES";

/**
* 加密
* @param src
* @param key
* @return
* @throws Exception
*/
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 src
* @param key
* @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);
}

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

return null;
}

/**
* 解密
* @param data
* @return
*/
public final static String decrypt(String src, String key) {
try {
return new String(decrypt(hex2byte(src.getBytes()), key));
} catch (Exception e) {
}

return null;
}

/**
* byte数组转十六进制字符串
* @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
& 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
}

return hs.toUpperCase();
}

/**
* 十六进制字符串转byte数组
* @param b
* @return
*/
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;
}
public static void main(String[] args) {
String encrypt = encrypt("hello", "ba5VHrFC8ViyN0JRG4xJyXtREe6xScbS");
System.out.println(encrypt);
String decrypt = decrypt(encrypt, "ba5VHrFC8ViyN0JRG4xJyXtREe6xScbS");
System.out.println(decrypt);
}
}