如何使用java代码对文本文件进行加密呢?

实现思路:
    使用KeyGenerator.getInstance("DES")
     获取相应的密钥信息
	然后对文本文件进行加密操作

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class TestClass{
    public static void main(String[] args) {

        try{
            KeyGenerator keygenerator = KeyGenerator.getInstance("DES");
            SecretKey myDesKey = keygenerator.generateKey();

            Cipher desCipher;
            desCipher = Cipher.getInstance("DES");

            byte[] text = "这是一段准备加密的文本信息".getBytes("UTF8");

            desCipher.init(Cipher.ENCRYPT_MODE, myDesKey);
            byte[] textEncrypted = desCipher.doFinal(text);

            String s = new String(textEncrypted);
            System.out.println(s);

            desCipher.init(Cipher.DECRYPT_MODE, myDesKey);
            byte[] textDecrypted = desCipher.doFinal(textEncrypted);

            s = new String(textDecrypted);
            System.out.println(s);
        }catch(Exception e)
        {
            System.out.println("Exception");
        }
    }
}