javase-net

javase 里面关于网络的基础类说明(工作中基本用不到,看着图个乐就行)

常用类

InetAddress

This class represents an Internet Protocol (IP) address.

  //获取主机名/IP
  InetAddress localHost = InetAddress.getLocalHost();
  System.out.println(localHost);
  //获取主机名/IP
  InetAddress inetAdd = InetAddress.getByName("www.baidu.com");
  System.out.println(inetAdd);
  //IP
  System.out.println(inetAdd.getHostAddress());
  //主机名
  System.out.println(inetAdd.getHostName());
//执行结果
// losssdeMac-mini.local/192.168.1.6
// www.baidu.com/119.63.197.139
// 119.63.197.139
// www.baidu.com

Socket

This class implements client sockets (also called just “sockets”). A socket is an endpoint for communication between two machines.

通过客户端和服务端的交互例子来说明常用方法

//client
public class Client {
    public static void main(String[] args) throws IOException {
        //向Server送数据
        Socket socket =new Socket("127.0.0.1",2222);
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("hello server".getBytes());

        //接收Server返回
        InputStream inputStream = socket.getInputStream();
        byte [] buff=new byte[1024];
        int length=inputStream.read(buff);
        System.out.println(new String(buff,0,length));

        inputStream.close();
        outputStream.close();
        socket.close();
    }
}
//server
public class Server {
    public static void main(String[] args) throws IOException {
        //打开Server接收数据
        ServerSocket serverSocket =new ServerSocket(2222);
        //获取服务端的套接字对象
        Socket socket = serverSocket.accept();
        InputStream inputStream = socket.getInputStream();
        byte[] buff = new byte[1024];
        int length=inputStream.read(buff);
        System.out.println(new String(buff,0,length));
        //向Clinet送数据
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("hello Client".getBytes());

        outputStream.close();
        inputStream.close();
        socket.close();
        serverSocket.close();
    }
}