服务器端socket

客户端通过new Socket()方法来创建Socket对象,服务器通过new serverSocket来创建TCP对象,通过accept()方法接受客户端的请求,并返回一个对象

服务器端通过new ServerSocket()创建通信的Socket对象

创建是在accept()中实现的

    public Socket accept() throws IOException {

        if (isClosed())

            throw new SocketException("Socket is closed");

        if (!isBound())

            throw new SocketException("Socket is not bound yet");

        Socket s = new Socket((SocketImpl) null);

        implAccept(s);

        return s;

    }

另外，创建ServerSocket有两种方式，第一种无参构造函数是未绑定的，还需要进一步绑定端口才能accept.

```

public static void main(String[] args) throws Exception{

    ServerSocket serverSocket = new ServerSocket();

    serverSocket.bind(new InetSocketAddress(8081));

    ServerSocket serverSocket1 = new ServerSocket(8081);

    serverSocket.accept();

}

```