Interface java

package main;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.[/contents/94-codage-base64 Base64];
/**
	Aes encryption
*/
public class UtilAES {
    
    private static SecretKeySpec secretKey ;
    private static byte[] key ;
    
    public UtilAES(String key){
    	setKey(key);
    }
    
    private void setKey(String myKey){
        MessageDigest sha = null;
        try {
            key = myKey.getBytes("UTF-8");
            sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16);
            secretKey = new SecretKeySpec(key, "AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }
    
    public String encode(String strToEncrypt) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            return Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
        } catch (Exception e) { 
            System.out.println("Error while encrypting: "+e.toString());
        }
        return null;
    }
    public String decode(String strToDecrypt) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            return new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt)));
        } catch (Exception e) {
            System.out.println("Error while decrypting: "+e.toString());
        }
        return null;
    }
     
}

public class Main {
	public static void main(String[] args) {
		String a_crypter = "Bonjour !";
		String crypte = new UtilAES("cle_de_chiffrement").encode(a_crypter);
		System.out.println(a_crypter + " ==> " + crypte);
	}