Network protocol java programming -TCP basic steps

The TCP:
the TCP protocol based on the request - response pattern
using transmission data stream implementation io

Create a server
1, specify the port to use to create a ServerSocket server
2, blocking wait for a connection accept, there is a accept to set up a client
3, Operation: io stream
4, free up resources

 public class tcp {

public static void main(String[]args) throws IOException
{
    System.out.println("-----Server-----");
    // 1、指定端口 使用ServerSocket创建服务器
        ServerSocket server=new ServerSocket(8888);

    // 2、阻塞式等待连接accept
        Socket client=server.accept();//返回一个Socket对象
        System.out.println("一个客户端建立了连接");
    // 3、操作：io流
        DataInputStream dis=new DataInputStream(client.getInputStream());//输入

        String data=dis.readUTF();
        System.out.println(data);
    // 4、释放资源
        dis.close();
        client.close();

        server.close();

    }
}

Create a client
1, to establish a connection: Socket created using the address and port of the client service +
2: Enter the output stream operation
3, the release of resources

 public class tcp2 {

public static void main(String[]args) throws IOException
{
    System.out.println("--------Client---------");
     //1、建立连接:使用Socket创建客户端+服务的地址和端口
    Socket client2=new Socket("localhost",8888);
     //2、操作：输入输出流操作
    DataOutputStream dos=new DataOutputStream(client2.getOutputStream());//输出

    String data="杜雨龙最帅";
    dos.writeUTF(data);
    dos.flush();
     //3、释放资源
    dos.close();
    client2.close();

}
}