构建TCP客户端、服务端

一、目标

构建TCP客户端、服务端

客户端发送数据

服务器读取数据并打印

二、客户端

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();
        //超时时间
        socket.setSoTimeout(3000);

        //连接本地端口2000，超时时间3000ms
        socket.connect(new InetSocketAddress(Inet4Address.getLocalHost(),2000),3000);
        System.out.println("The Server is start.......");
        System.out.println("The Client info is"+socket.getLocalAddress()+" P:"+socket.getLocalPort());
        System.out.println("The Server info is"+socket.getInetAddress()+" P:"+socket.getPort());

        try {
            //发送接收数据
            todo(socket);
        }catch (Exception e){
            System.out.println("Failed Connected");
        }

        //释放资源
        socket.close();
        System.out.println("The Client is quiet~");
    }

    private static void todo(Socket client) throws IOException{
        //构建键盘输入流
        InputStream in = System.in;
        BufferedReader input = new BufferedReader(new InputStreamReader(in));

        //得到Socket输出流，并转换为打印流
        OutputStream outputStream = client.getOutputStream();
        PrintStream socketPrintStream = new PrintStream(outputStream);

        //得到输入流,并转换为BufferedReader
        InputStream inputStream = client.getInputStream();
        BufferedReader socketBufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        boolean flag = true;
        do {
            //键盘读取一行
            String str = input.readLine();
            //发送服务器
            socketPrintStream.println(str);

            //从服务器读取一行
            String echo = socketBufferedReader.readLine();
            if("bye".equalsIgnoreCase(echo)){
                flag = false;
            }else {
                System.out.println(echo);
            }
        }while (flag);

        socketPrintStream.close();
        socketBufferedReader.close();
    }
}

三、服务端

import java.io.*;
import java.net.Inet4Address;
import java.net.InetSocketAddress;
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("The Server is ready~");
        System.out.println("The Server info is"+server.getInetAddress()+"P:"+server.getLocalPort());

        for(;;) {
            //等待客户端连接
            Socket client = server.accept();
            //客户端构建异步线程
            ClientHandler clientHandler = new ClientHandler(client);
            //启动线程
            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("New Client Connected："+socket.getInetAddress()+"P:"+socket.getPort());

            try{
                //得到打印流，用于数据输出；服务器回事数据使用
                PrintStream socketOutput = new PrintStream(socket.getOutputStream());
                //得到输入流，用于接收数据
                BufferedReader socketInput = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                do{
                    String str = socketInput.readLine();
                    if("bye".equalsIgnoreCase(str)){
                        flag = false;
                        //回送
                        socketOutput.println("bye");
                    }else {
                        //打印到屏幕。并回送数据长度
                        System.out.println(str);
                        socketOutput.println("Send："+str.length());
                    }
                }while (flag);

                socketInput.close();
                socketOutput.close();
            }catch (Exception e){
                System.out.println("Failed Connected Port");
            }finally {
                try {
                    socket.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
            System.out.println("New Client is quit"+socket.getInetAddress()+" P:"+socket.getPort());
        }
    }

}

四、运行

rebuild一下项目，生成class文件