第一次课：简单的TCP/IP编程实例

package cn.shxy.net;

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

public class TCPServer {
    //主函数
    public static void main(String[] args) throws IOException{
        new TCPServer();
    }
    
    //服务器套接字
    private ServerSocket serverSocket;
    //客户端套接字
    private Socket client;
    
    //构造函数
    public TCPServer() throws IOException{
        //实例化服务器套接字
        serverSocket = new ServerSocket(65535);
        //接受客户端连接
        client = serverSocket.accept();
        //输出客户端地址和端口
        System.out.println(client.getInetAddress() + ":" + client.getPort());
        
        //获取输出流对象，包装成打印流
        PrintStream p = new PrintStream(client.getOutputStream());
        //向客户端发信息，注意此处的换行符
        p.print("你好！\r\n");
    }
}

package cn.shxy.net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class TCPClient {
    //主函数
    public static void main(String[] args) throws UnknownHostException, IOException{
        new TCPClient();
    }
    
    //套接字
    private Socket client;
    
    //构造函数
    public TCPClient() throws UnknownHostException, IOException{
        //与服务器相连
        client = new Socket("127.0.0.1", 65535);
        //包装输入流对象，用于获取服务器的消息
        BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream())) ;
        //读取一行
        String str = reader.readLine();
        //输出读取的消息
        System.out.println("从服务器端得到数据：" + str);
    }
}