Java TCP通信：模拟服务器与客户端

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Horizonhui/article/details/80530751

首先是服务器端的代码：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Tcpserver {
    public static void main(String[] args) {
        try {
            ServerSocket ss = new ServerSocket(8889); //指定端口，服务器与客户端要一致


            while (true) {
                Socket socket = ss.accept();      //等待客户端的接入
                System.out.println("the server is listening---" + socket);

                System.out.println("服务器端读取数据");
                InputStream is = socket.getInputStream();          //建立输入流，读取来自客户端的数据
                byte[] bytes = new byte[1024];                     //字节流，所以用byte数组存储
                int len = 0;
                String str = null;
                while ((len = is.read(bytes)) != -1) {
                    str = new String(bytes, 0, len);
                    System.out.println(str);
                }
                socket.shutdownInput();           //关闭输入

                //String str = "hello world";
                str = "I have received：" + str;
                OutputStream os = socket.getOutputStream();        //建立字节输出流，将反馈信息发送给客户端
                os.write(str.getBytes());                              //同样是要用字节的方式
                System.out.println("服务端写出数据完毕！");

                socket.shutdownOutput();

                os.close();
                is.close();
                socket.close();

                if (str.compareTo("quit") == 0)
                    break;
            }
            System.out.println("the server will quit...");
            ss.close();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

客户端：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class Tcpclient {
    public static void main(String[] args) {
        try {
            Scanner cin = new Scanner(System.in);
            Socket socket=new Socket(InetAddress.getLocalHost(),8889);     //连接服务器，通过TCP/IP，指定端口号
            System.out.println("客户端："+socket);

            String data= new String();
            String stop = "quit";
            data = cin.next();
            OutputStream os = socket.getOutputStream();                //建立字节输出流
            os.write(data.getBytes());                                   //将输入的内容发送给服务器
            System.out.println("键盘输入数据，客户端写出数据完毕！");

            socket.shutdownOutput();            
            System.out.println("客户端读取数据");
            InputStream is = socket.getInputStream();                  //建立字节输入流

            byte[] bytes=new byte[1024];
            int len=0;
            String str=null;
            while((len=is.read(bytes))!=-1)
            {
                str=new String(bytes,0,len);
                System.out.println(str);
            }
            socket.shutdownInput();

           
            is.close();                //关闭所有的通道
            os.close();
            socket.close();

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}