http://www.cnblogs.com/chen-lhx/p/5817161.html

***************************************************

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

import org.apache.commons.codec.binary.Base64;
/**
 *
 * @author Administrator
 *
 */
public class AES {

    // 加密
    public static String Encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            System.out.print("Key為空null");
            return null;
        }
        // 判斷Key是否為16位
        if (sKey.length() != 16) {
            System.out.print("Key長度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"演算法/模式/補碼方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

        return new Base64().encodeToString(encrypted);//此處使用BASE64做轉碼功能，同時能起到2次加密的作用。
    }

    // 解密
    public static String Decrypt(String sSrc, String sKey) throws Exception {
        try {
            // 判斷Key是否正確
            if (sKey == null) {
                System.out.print("Key為空null");
                return null;
            }
            // 判斷Key是否為16位
            if (sKey.length() != 16) {
                System.out.print("Key長度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密
            try {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original,"utf-8");
                return originalString;
            } catch (Exception e) {
                System.out.println(e.toString());
                return null;
            }
        } catch (Exception ex) {
            System.out.println(ex.toString());
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        /*
         * 此處使用AES-128-ECB加密模式，key需要為16位。
         */
        String cKey = "1234567890123456";
        // 需要加密的字串
        String cSrc = "www.gowhere.so";
        System.out.println(cSrc);
        // 加密
        String enString = AES.Encrypt(cSrc, cKey);
        System.out.println("加密後的字串是：" + enString);

        // 解密
        String DeString = AES.Decrypt(enString, cKey);
        System.out.println("解密後的字串是：" + DeString);
    }
}

//原始碼片段來自雲程式碼http://yuncode.net
            
 

package cd.server.data;

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

import android.annotation.SuppressLint;
import android.util.Base64;

// http://blog.csdn.net/hbcui1984/article/details/5201247
// AES加密解密工具類 
public class AES128
{
	private static final String UTF_8 = "UTF-8";

	/** 
     * 加密 
     * @param content 需要加密的內容 
     * @param password  加密密碼 
     * @return 
     */  
    @SuppressLint ("TrulyRandom")
	public static String encrypt(String key, String src)
	{
		try
		{
			if(key == null || key.length() <= 0 || src == null || src.length() <= 0) return null;
			
			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
			byte[] byteContent = src.getBytes(UTF_8);
			cipher.init(Cipher.ENCRYPT_MODE, skey);// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return byte2Base64(result); // 加密
		}
		catch (Exception ext)
		{
			ext.printStackTrace();
		}
		return null;
	}
    private static  String byte2Base64(byte[] encode)
	{
		try
		{
			return Base64.encodeToString(encode, Base64.NO_WRAP);

		}
		catch (Exception ext)
		{
			ext.printStackTrace();
		}

		return null;
	}
}