C#与java TCP通道加密通信实例

首先，为了实现C#与Java之间的TCP加密通道通信，我们需要使用SSL加密套接字。下面是实现的步骤：

步骤1：创建SSL加密证书

我们需要在服务器上创建一个SSL证书用于加密TCP通信，这可以使用OpenSSL工具来实现。

openssl req -new -x509 -days 365 -nodes -out server.crt -keyout server.key

步骤2：java端实现

java端的实现使用JSSE包，以下是java端建立TCP加密通道的示例代码，其中包括证书的加载和加密套接字的创建：

SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket("localhost", 9999);

/* 服务器端证书的信任校验 */
SSLSession session = sslsocket.getSession();
X509Certificate serverCert = (X509Certificate) session.getPeerCertificates()[0];
PublicKey serverPubKey = serverCert.getPublicKey();
TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
trustStore.load(null);
trustStore.setCertificateEntry("server", serverCert);
trustManagerFactory.init(trustStore);
TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
SecureRandom secureRandom = new SecureRandom();
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, trustManagers, secureRandom);

/* 建立加密通道 */
SSLSocket s = (SSLSocket) sslContext.getSocketFactory().createSocket("localhost", 9999);
InputStream inputstream = s.getInputStream();
InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);

步骤3：C#端实现

C#端的实现使用了SslStream类，以下是C#端建立TCP加密通道的示例代码，其中包括证书的加载和加密套接字的创建：

TcpClient client = new TcpClient("localhost", 9999);
SslStream sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null);
sslStream.AuthenticateAsClient("localhost");

/* 建立加密通道 */
StreamWriter writer = new StreamWriter(sslStream);
writer.WriteLine("Hello Server!");
writer.Flush();
StreamReader reader = new StreamReader(sslStream);
string response = reader.ReadLine();

示例1：C#发送数据给Java

下面是在C#端使用TCP通道与Java端完成字符串传输的示例代码：

TcpClient client = new TcpClient("localhost", 9999);
SslStream sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null);
sslStream.AuthenticateAsClient("localhost");

byte[] message = Encoding.UTF8.GetBytes("Hello Java!");
sslStream.Write(message);

SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket("localhost", 9999);

byte[] buffer = new byte[1024];
InputStream inputstream = sslsocket.getInputStream();
BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(inputstream));

int bytesRead = inputstream.read(buffer);
String message = new String(buffer, 0, bytesRead);

示例2：Java发送数据给C

下面是在Java端使用TCP通道与C#端完成对象传输的示例代码：

SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket("localhost", 9999);

ObjectOutputStream oos = new ObjectOutputStream(sslsocket.getOutputStream());
oos.writeObject(new Person("Lucas", 20, "male"));
oos.flush();

TcpClient client = new TcpClient("localhost", 9999);
SslStream sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null);
sslStream.AuthenticateAsClient("localhost");

BinaryFormatter formatter = new BinaryFormatter();
Person p = (Person)formatter.Deserialize(sslStream);

以上就是C#与Java TCP通道加密通信的完整攻略。