可以簡單的這樣實現：

import?java.security.Key;
import?java.util.Scanner;

import?javax.crypto.Cipher;
import?javax.crypto.KeyGenerator;
import?javax.crypto.SecretKey;
import?javax.crypto.SecretKeyFactory;
import?javax.crypto.spec.DESKeySpec;

import?org.apache.commons.codec.binary.Hex;

public?class?TestDES?{

	public?static?void?main(String[]?args)?{
		Scanner?input?=?new?Scanner(System.in);
		System.out.println("請輸入需要加密的內容：");
		String?src?=?input.nextLine();
		jdkDES(src);
		input.close();
	}
	
	public?static?void?jdkDES(String?src)?{
		try?{
			//生成key
			KeyGenerator?keyGenerator?=?KeyGenerator.getInstance("DES");
			SecretKey?secretKey?=?keyGenerator.generateKey();
			byte[]?byteKey?=?secretKey.getEncoded();
			
			//轉換Key
			DESKeySpec?desKeySpec?=?new?DESKeySpec(byteKey);
			SecretKeyFactory?factory?=?SecretKeyFactory.getInstance("DES");
			Key?convertSecretKey?=?factory.generateSecret(desKeySpec);
		
			//加密
			Cipher?cipher?=?Cipher.getInstance("DES/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE,?convertSecretKey);
			byte[]?result?=?cipher.doFinal(src.getBytes());
			System.out.println("jdk?des?encrypt:?"?+?Hex.encodeHexString(result));
			
			//解密
			cipher.init(Cipher.DECRYPT_MODE,?convertSecretKey);
			result?=?cipher.doFinal(result);
			System.out.println("jdk?des?decrypt:?"?+?new?String(result));
		}?catch?(Exception?e)?{
			e.printStackTrace();
		}
		
	}

}