服務器端與客戶端的簡單交互

工具idea

1.客戶端代碼

import java.io.*;
import java.net.Inet4Address;
import java.net.InetSocketAddress;
import java.net.Socket;

public class Client {
    public static void main(String[] args) throws IOException{
        Socket socket = new Socket();
        //超時時間
        socket.setSoTimeout(3000);
        //連接本地，連接端口2000，超時時間3000
        socket.connect(new InetSocketAddress(Inet4Address.getLocalHost(),2000),3000);

        System.out.println("已發起服務器連接，並進入後續流程");
        System.out.println("客戶端信息："+ socket.getLocalAddress() + "p:" + socket.getLocalPort());
        System.out.println("服務器端信息"+ socket.getInetAddress() + "p:" + socket.getPort());

        try{
            todo(socket);
        }catch (Exception e){
            System.out.println("異常關閉");
        }

        socket.close();
        System.out.println("客戶端已退出");
    }


    private static void todo(Socket client) throws IOException {
        //構建鍵盤輸入流
        InputStream in = System.in;
        BufferedReader input = new BufferedReader(new InputStreamReader(in));

        //得到Socket輸出流，並打印出去
        OutputStream outputStream = client.getOutputStream();
        PrintStream socketPrintStream = new PrintStream(outputStream);

        //得到Socket輸入流，並轉換爲BufferedReader
        InputStream inputStream = client.getInputStream();
        BufferedReader sockerBufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        boolean flag = true;
        do {
            //鍵盤讀取一行
            String str = input.readLine();
            //發送到服務器
            socketPrintStream.println(str);
            //從服務器讀取一行
            String echo = sockerBufferedReader.readLine();
            if ("bye".equalsIgnoreCase(echo)) {
                flag = false;
            }else{
                System.out.println(echo);
            }
        }while (flag);

        socketPrintStream.close();
        sockerBufferedReader.close();
    }

}

2.服務器端代碼

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

public class Server {
    public static void main(String[] args) throws IOException {

        ServerSocket server = new ServerSocket(2000);

        System.out.println("服務器準備就緒");
        System.out.println("服務器端信息"+ server.getInetAddress() + "p:" + server.getLocalPort());

        //等待客戶端連接
        for (;;) {
            //得到客戶端
            Socket client = server.accept();
            //客戶端構建異步線程
            ClientHandler clientHandler = new ClientHandler(client);
            //啓動線程
            clientHandler.start();
        }
    }

    private static class ClientHandler extends Thread{
        private Socket socket;
        private boolean flag = true;

        ClientHandler(Socket socket){
            this.socket = socket;
        }

        @Override
        public void run(){
            super.run();
            System.out.println("新客戶端連接"+ socket.getInetAddress() + "p:" + socket.getPort());
            try{
                //得到打印流
                PrintStream sockerOutput = new PrintStream(socket.getOutputStream());
                //得到輸入流,用於接收數據
                BufferedReader sockInput = new BufferedReader(new InputStreamReader(
                        socket.getInputStream()));
                boolean flag = true;
                do {
                    //鍵盤讀取一行
                    String str = sockInput.readLine();
                    if ("bye".equalsIgnoreCase(str)) {
                        flag = false;
                        sockerOutput.println("bye");
                    }else{
                        //打印到屏幕，同時回送數據
                        System.out.println(str);
                        sockerOutput.println("回送:"+str.length());
                    }
                }while (flag);

                sockInput.close();
                sockerOutput.close();

            }catch(Exception e){
                System.out.println("連接異常斷開");
            }finally {
                //連接關閉
                try{
                    socket.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
            System.out.println("客戶端已退出" + socket.getInetAddress() + "p:" + socket.getPort());
        }
    }

}

運行效果: