package net;

import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) throws Exception{
        ServerSocket server =  new ServerSocket(8888);
        System.out.println("等待客户端连接.......");
        Socket client = server.accept(); //接收客户端连接
        
        PrintStream out = new PrintStream(client.getOutputStream());
        out.println("HelloWorld"); //要输出的信息
        out.close();
        client.close();
        server.close();
    }
}

package net;

import java.net.Socket;
import java.util.Scanner;

public class Client {
    
    public static void main(String[] args) throws Exception {
        Socket client = new Socket("localhost", 8888);
        Scanner scan = new Scanner(client.getInputStream());
        scan.useDelimiter("\n");
        if(scan.hasNext()){
            System.out.println(scan.next());
        }
        scan.close();
        client.close();
    }

}