Java AES 
/*
key跟原文還有密文,全部都用String傳值
AES加解密    使用外部呼叫範例nAES.getencrypt  加密,return一個密文編碼(base64)
AES.getdecrypt  解密,return明文String回來
*/
import java.io.*;
import sun.misc.*;
import javax.crypto.*;
import java.security.*;
import javax.crypto.spec.*;
class AES
{
  public static String getencrypt(String k,String p) throws Exception
  {
    String encrypted="";
    try{
      KeyGenerator kgen = KeyGenerator.getInstance("AES");
      kgen.init(128,new SecureRandom(k.getBytes() ) );
      SecretKey skey = kgen.generateKey();
      byte[] raw = skey.getEncoded();
      SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
      Cipher cipher = Cipher.getInstance("AES");
      cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
      byte[] encrypt =
      cipher.doFinal( p.getBytes());
      encrypted=new BASE64Encoder().encodeBuffer(encrypt);
      //System.out.println("encrypted="+encrypted);
      }//try
      catch(Exception e){System.out.println(e);
      }
      return encrypted;  //return 密文
  }
  public static String getdecrypt(String k2,String base64) throws Exception
  {
    String decrypted="";
    try{
    byte[] b = new BASE64Decoder().decodeBuffer( base64 );
    KeyGenerator kgen2 = KeyGenerator.getInstance("AES");
    kgen2.init(128,new SecureRandom(k2.getBytes() ) );
    SecretKey skey2 = kgen2.generateKey();
    byte[] raw2 = skey2.getEncoded();
    SecretKeySpec skeySpec2 = new SecretKeySpec(raw2, "AES");
    Cipher cipher2 = Cipher.getInstance("AES");
    cipher2.init(Cipher.DECRYPT_MODE, skeySpec2);
    byte[] decrypt =
    cipher2.doFinal( b);
    decrypted=new String(decrypt);
    //System.out.println("decrypted="+decrypted);
 
    }catch(Exception e)
    {System.out.println(e);}
      return decrypted;
  }
}

測試範例
class aestest 
{
  public static void main(String[] args) throws Exception
  {
    String k="1234";
    String plain="JSPtw好棒阿^^!!";
    //加密
    String en=AES.getencrypt(k,plain);
    String encryptd=new String (en);
 
    System.out.println("\nget密文:"+encryptd);
 
    //解密
    String de=AES.getdecrypt(k,encryptd);
    String decryptd=new String (de);
    System.out.println("\nget明文:"+decryptd);
  }
}