一个简单的TCP/IP服务端客户端对话

//TCP/IP服务器

import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class TestSocketServer {

    ServerSocket serverSocket;
    int portNumber=9001;
    Socket socket;
    String str;
    
    public TestSocketServer(){
        str="Hello,I am Server!";
        
        try {
            //使用端口号创建一个serverSocket对象
            serverSocket=new ServerSocket(portNumber);
            //等待一个客户连接端口xx的服务器
            socket=serverSocket.accept();
            //创建流发送数据
            ObjectOutputStream oos =new ObjectOutputStream(socket.getOutputStream());
            
            oos.writeObject(str);
            //关闭流和套接字
            oos.close();
            socket.close();
        } catch (Exception e) {

            e.printStackTrace();
        }
        
    }
    
    public static  void main(String[]args){
        TestSocketServer tss=new TestSocketServer();
    }
}

//TCP/IP客户

import java.io.ObjectInputStream;
import java.net.InetAddress;
import java.net.Socket;

public class TestSocketClient {

    Socket socket ;
    int portNumber=9001;
    String string="";
    
    public TestSocketClient(){
        try {
            //创建Socket类对象,向它传递服务器的IP地址和服务器监听端口
            socket =new Socket(InetAddress.getLocalHost(),portNumber);
            //创建输入流,访问数据
            ObjectInputStream ois=new ObjectInputStream(socket.getInputStream());
            //读取对象
            string=(String)ois.readObject();
            System.out.println(string);
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    public static void main(String[]args){
        
        TestSocketClient tcp=new TestSocketClient();
    }
}