AES.ECB.PKCS5Padding.java

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64.*;

//import org.apache.commons.codec.binary.Base64;

/**
 * @author netkiller
 *
 */
public class aes {

	public static String encrypt(String input, String key) {
		byte[] crypted = null;
		try {
		
			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
			
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, skey);
			crypted = cipher.doFinal(input.getBytes());
		} catch (Exception e) {
			System.out.println(e.toString());
		}
		java.util.Base64.Encoder encoder = java.util.Base64.getEncoder();
		
		return new String(encoder.encodeToString(crypted));
	}

	public static String decrypt(String input, String key) {
		byte[] output = null;
		try {
			java.util.Base64.Decoder decoder = java.util.Base64.getDecoder();
			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
			cipher.init(Cipher.DECRYPT_MODE, skey);
			output = cipher.doFinal(decoder.decode(input));
		} catch (Exception e) {
			System.out.println(e.toString());
		}
		return new String(output);
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		String key = "mvLBiZsiTbGwrfJB";
		String data = "ABC";

		System.out.println(aes.encrypt(data, key));
		System.out.println(aes.decrypt(aes.encrypt(data, key), key));
	}

}

I can leave space in the key string and data string ?

yes