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为空null");

            return null;

        }

        // 判断Key是否为16位

        if (sKey.length() != 16) {

            System.out.print("Key长度不是16位");

            return null;

        }

        byte[] raw = sKey.getBytes("utf-8");

        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");

        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

        return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。

    }

    // 解密

    public static String Decrypt(String sSrc, String sKey) throws Exception {

        try {

            // 判断Key是否正确

            if (sKey == null) {

                System.out.print("Key为空null");

                return null;

            }

            // 判断Key是否为16位

            if (sKey.length() != 16) {

                System.out.print("Key长度不是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 {

        /*

         * 此处使用AES-128-ECB加密模式，key需要为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("加密后的字串是：" + enString);

        // 解密

        String DeString = AES.Decrypt(enString, cKey);

        System.out.println("解密后的字串是：" + DeString);

    }

}

//源代码片段来自云代码http://yuncode.net