客户端服务器一来一回

绝地灬酷狼 2022-05-14 20:06 170阅读 0赞

Socket 通信

IP地址的组成 32位 由4个8位二进制数组成。

IP=网络地址+主机地址

Ipconfig/all       dos命令查看ip

测试网络是否连通

Ping 127.0.0.0(本机地址)看自己的网卡有没有坏

Ping [www.baidu.com][] 看能不能连上广域网

服务器：性能很好的计算机

端口号：每一个程序都会有一个唯一的端口号，程序之间端口号不能一样

Nextline() 一次一行

//服务器

package 客户端一来一回;
    
    import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.SocketAddress;
    import java.net.SocketException;
    import java.util.Scanner;
    
    public class send {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		String con = "";
    		do {
    			try {
    				Scanner input = new Scanner(System.in);
    				byte[] buf = new byte[1024];
    				DatagramPacket dp = new DatagramPacket(buf, buf.length);
    				System.out.println("服务端已启动，等待客户端连接..");
    				//创建datagramsocket对象，接收数据
    				DatagramSocket ds = new DatagramSocket(8800);
    				ds.receive(dp);
    				//显示接收到的信息
    				String mess = new String(dp.getData(), 0, dp.getLength());
    				System.out.println(dp.getAddress().getHostAddress() + "说："
    						+ mess);
    				System.out.println("服务器你好，请输入你的内容");
    				String reply = input.nextLine();
    				System.out.println("同学b 说:" + reply);
    				// 创建datagramPacket对象，封装数据
    				SocketAddress sa = dp.getSocketAddress();
    				DatagramPacket dpto = new DatagramPacket(reply.getBytes(),
    						reply.getBytes().length, sa);
    				ds.send(dpto);
    				ds.close();
    				con = reply;
    
    			} catch (SocketException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    
    		} while (!con.equals("bye"));
    
    	}
    
    }

//客户端

package 客户端一来一回;
    
    import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;
    import java.net.SocketException;
    import java.net.UnknownHostException;
    import java.util.Scanner;
    
    public class Receive {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		String con="";
    		do{
    		try {
    			Scanner input=new Scanner(System.in);
    			System.out.println("客户端你好，请输入你的内容");
    			String mess=input.nextLine();
    			System.out.println("同学a 说:"+mess);
    			//获取本地主机地址
    			InetAddress ia=InetAddress.getByName("localhost");
    			// 创建datagramPacket对象，封装数据
    			DatagramPacket dp=new DatagramPacket(mess.getBytes(), mess.getBytes().length,ia,8800);
    			//创建datagramsocket对象，向服务器发送数据
    			DatagramSocket ds=new DatagramSocket();
    			ds.send(dp);
    			byte[] buf=new byte[1024];
    			DatagramPacket dpre=new DatagramPacket(buf, buf.length);
    			//创建datagramsocket对象，接收数据
    			ds.receive(dpre);
    			String reply=new String(dpre.getData(),0,dpre.getLength());
    			System.out.println("同学b 说:"+reply);
    			ds.close();
    			con=mess;
    	       
    		} catch (UnknownHostException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (SocketException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    		
    		}while(!con.equals("bye"));
    
    	}
    	
    
    }

![70][]

[www.baidu.com]: http://www.baidu.com
[70]: /images/20220515/816b4ec5d7874e598440f95076e457c7.png