import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.apache.tomcat.util.codec.binary.Base64;
public class AESUtils {
    private static final String ALGORITHM = "AES/ECB/PKCS5Padding";
    public static final String AES = "AES";
    public static final String CHARSET_UTF8 = "utf-8";
    public AESUtils() {
    }
    public static String encrypt(String content, String key) throws Exception {
        byte[] raw = key.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(1, skeySpec);
        byte[] encrypted = cipher.doFinal(content.getBytes("utf-8"));
        return Base64.encodeBase64String(encrypted);
    }
    public static String dcrypt(String content, String key) throws Exception {
        byte[] raw = key.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(2, skeySpec);
        byte[] encrypted1 = (new Base64()).decode(content);
        byte[] original = cipher.doFinal(encrypted1);
        return new String(original, "utf-8");
    }
}

资料

• java实现多种加密模式的AES算法-总有一种你用的着