java tcp接口_使用Java编写TCP协议发送和接收数据接口

要使用Java编写TCP协议发送和接收数据接口，可以使用Java自带的Socket和ServerSocket类。

首先，创建一个ServerSocket对象，指定监听的端口号：

ServerSocket serverSocket = new ServerSocket(8888);

然后，创建一个Socket对象，指定连接的IP地址和端口号：

Socket socket = new Socket("127.0.0.1", 8888);

接下来，可以使用socket对象的输入输出流来发送和接收数据：

// 发送数据
OutputStream outputStream = socket.getOutputStream();
outputStream.write("hello".getBytes());

// 接收数据
InputStream inputStream = socket.getInputStream();
byte[] buffer = new byte[1024];
int len = inputStream.read(buffer);
String result = new String(buffer, 0, len);
System.out.println(result);

当有客户端连接到ServerSocket时，可以使用accept()方法获取到一个Socket对象，然后就可以进行数据的收发了：

Socket socket = serverSocket.accept();

完整的代码示例：

// 服务端
ServerSocket serverSocket = new ServerSocket(8888);
Socket socket = serverSocket.accept();

InputStream inputStream = socket.getInputStream();
byte[] buffer = new byte[1024];
int len = inputStream.read(buffer);
String result = new String(buffer, 0, len);
System.out.println(result);

OutputStream outputStream = socket.getOutputStream();
outputStream.write("world".getBytes());

socket.close();
serverSocket.close();

// 客户端
Socket socket = new Socket("127.0.0.1", 8888);

OutputStream outputStream = socket.getOutputStream();
outputStream.write("hello".getBytes());

InputStream inputStream = socket.getInputStream();
byte[] buffer = new byte[1024];
int len = inputStream.read(buffer);
String result = new String(buffer, 0, len);
System.out.println(result);

socket.close();