Java中的AES和DES是兩種常用的加密算法，它們都可以用于數據的加密和解密。下面分別介紹一下這兩種算法。

AES：

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class AESUtil {
public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
SecretKey secretKey = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
return cipher.doFinal(data);
}
public static byte[] decrypt(byte[] encryptedData, byte[] key) throws Exception {
SecretKey secretKey = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return cipher.doFinal(encryptedData);
}
public static byte[] initKey() throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
SecretKey secretKey = keyGenerator.generateKey();
return secretKey.getEncoded();
}
}

DES：

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
public class DESUtil {
public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
SecretKey secretKey = new SecretKeySpec(key, "DES");
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
return cipher.doFinal(data);
}
public static byte[] decrypt(byte[] encryptedData, byte[] key) throws Exception {
SecretKey secretKey = new SecretKeySpec(key, "DES");
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return cipher.doFinal(encryptedData);
}
public static byte[] initKey() throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);
SecretKey secretKey = keyGenerator.generateKey();
return secretKey.getEncoded();
}
}

以上代碼為Java實現的AES和DES算法，具體使用可參考各個方法的注釋。在實際開發中，根據具體的需求選擇合適的加密算法，加強數據的安全性。