SymmetricCrypto class

package javaapplication1;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;

public class SymmetricCrypto {
    //generate DES key with length 56 to file
    public void generateKey(String keyFile){
        try{
            KeyGenerator keyGen=KeyGenerator.getInstance("DES");
            keyGen.init(56);
            //generate key object
            Key key=keyGen.generateKey();
            //key object is saved by using FileOutputStream to keyFile
            //and the value is generated by getEncoded
            FileOutputStream f=new FileOutputStream(keyFile);
            f.write(key.getEncoded());
            f.close();
        }catch(Exception e){
            System.out.println("Error: "+e.getMessage());
        }
    }
    //receive key object in file opened by FileInputStream and read by read method
    //length of byte read is the same of length of key object
    public byte[] readKeyFile(String keyFile){
        byte[] fileContent=null;
        try{
            FileInputStream fin=new FileInputStream(keyFile);
            int len=fin.available();
            fileContent=new byte[len];
            fin.read(fileContent,0,len);
            fin.close();
        }catch (Exception e){
            System.out.println("Error "+e);
        }
        return fileContent;
    }
    //Encrypt message with key object in array byte
    public byte[] Encrypt (String message, byte[] keyEncoded){
        byte [] encrypted=null;
        try{
           byte[] input=message.getBytes("UTF8");
           //Activate key using DES
           SecretKeySpec key = new SecretKeySpec(keyEncoded,"DES");
           //initiate cipher object using DES/ECB/PKCS5Padding
           Cipher cipher=Cipher.getInstance("DES/ECB/PKCS5Padding");
           cipher.init(Cipher.ENCRYPT_MODE,key);
           //start encryption
           encrypted = cipher.doFinal(input);
        }catch(Exception e){
         System.out.println(e.getMessage());
        }
        return encrypted;
    }
    //Decryption method
    public byte[]Decrypt(byte[]encrypted,byte[]keyEncoded){
        byte[]plainText=null;
        try{
            SecretKeySpec key=new SecretKeySpec(keyEncoded,"DES");
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE,key);
            plainText=cipher.doFinal(encrypted);
        }catch (Exception e){
            System.out.println(e.getMessage());
        }
        return plainText;
    }
    public static void main(String[] args) {
        try{
            SymmetricCrypto crypto=new SymmetricCrypto();
        crypto.generateKey("D:/crypto.key");
        String message="Selamat datang Java";
        byte[]key=crypto.readKeyFile("D:/crypto.key");
        byte[]encrypted=crypto.Encrypt(message, key);
        byte[]plaintex=crypto.Decrypt(encrypted,key);
        System.out.println("message: "+message);
        System.out.println("encrypted: "+new String(encrypted));
        System.out.println("encypted hex: "+StringUtils.getHexString(encrypted));
        System.out.println("plaintext: "+new String(plaintex));
        }catch (Exception e){
            System.out.println("Error: "+e.getMessage());
        }
    }
}