Java TCP通信：模拟服务器与客户端

一时失言乱红尘 2022-05-23 03:16 231阅读 0赞

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();
            }
    
        }
    }

![20180531215405689][]

![20180531215417135][]

[20180531215405689]: /images/20220523/608c9f66bc3649a48698dbf840a1eb5d.png
[20180531215417135]: /images/20220523/cbdf2ce2537e472a8383971d998d3221.png