public??class?DH?{
	public?static?void?main(String[]?args)throws?Exception{
		//初始化發送方密鑰----------------------------------------------------------------
		KeyPairGenerator?keyPairGenerator=KeyPairGenerator.getInstance("DH");
		keyPairGenerator.initialize(1024);
		KeyPair?senderKeyPair=keyPairGenerator.generateKeyPair();
		byte[]?senderPbkEnc=senderKeyPair.getPublic().getEncoded();//得到發送方公鑰的??byte數組形式;>>>>>>>>>>>>>>>>>-傳遞給接受方
		
		//使用發送方密鑰中的參數?初始化接收方的密鑰載體------------------------------------------------
		KeyFactory?keyFactory=KeyFactory.getInstance("DH");
		X509EncodedKeySpec?x509EncodedKeySpec=new?X509EncodedKeySpec(senderPbkEnc);?//根據發送方給定的編碼密鑰創建一個符合編碼標準的?X509EncodedKeySpec
		
		PublicKey?publicKey=keyFactory.generatePublic(x509EncodedKeySpec);???//密鑰工廠根據?標準密鑰規范的編碼?生成公鑰
		
		DHParameterSpec?dhParameterSpec=DHPublicKey.class.cast(publicKey).getParams();??//從公鑰中獲取參數?
		KeyPairGenerator?keyPairGenerator2=KeyPairGenerator.getInstance("DH");
		keyPairGenerator2.initialize(1024);
		keyPairGenerator2.initialize(dhParameterSpec);?//利用發送方傳遞的公鑰中獲取的參數?初始化密鑰生成器
		KeyPair?receiverkeyPair=keyPairGenerator2.generateKeyPair();?//生成秘鑰
		
		PrivateKey?receiverPrivateKey=receiverkeyPair.getPrivate();?//獲得私鑰
		//獲得公鑰bytes??此公鑰用于傳遞給發送方
		byte[]?receiverPbkBytes=receiverkeyPair.getPublic().getEncoded();//>>>>>>>>>>>>>>>>>>>>>>傳遞給發送方
		
		//構建接收方密鑰
		KeyAgreement?keyAgreement=KeyAgreement.getInstance("DH");
		keyAgreement.init(receiverPrivateKey);
		keyAgreement.doPhase(publicKey,?true);
		SecretKey?receiverSecretKey=keyAgreement.generateSecret("DES");?//接收方密鑰構建完成
		
		//構建發送方密鑰---------------------------------------------------------------
		KeyFactory?keyFactory2=keyFactory.getInstance("DH");
		X509EncodedKeySpec?x509EncodedKeySpec2=new?X509EncodedKeySpec(receiverPbkBytes);
		PublicKey?senderPublicKey=keyFactory2.generatePublic(x509EncodedKeySpec2);
		KeyAgreement?keyAgreement2=KeyAgreement.getInstance("DH");
		keyAgreement2.init(senderKeyPair.getPrivate());
		keyAgreement2.doPhase(senderPublicKey,?true);
		
		SecretKey?senderSecretKey?=keyAgreement2.generateSecret("DES");?//發送方密鑰構建完成
		
		
		//進行加解密
		String?str="imooc?security";
		Cipher?cipher=Cipher.getInstance("DES");
		cipher.init(Cipher.ENCRYPT_MODE,?senderSecretKey);
		cipher.update(str.getBytes());
		byte[]?bs=cipher.doFinal();
		System.out.println("DH加密后:"+Hex.encodeHexString(bs));
		
		cipher.init(Cipher.DECRYPT_MODE,?receiverSecretKey);
		System.out.println("解密后:"+new?String(cipher.doFinal(bs)));
		
	}
}

最后控制臺輸出 的事?curity ? 前面部分消失了