Java-Socket

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("服務器信息："+server.getInetAddress()+" P:"+server.getLocalPort());

        //等待客戶端連接(無限循環)
        for(;;) {
            //得到客戶端
            Socket client = server.accept();
            //加入異步線程
            ClientHandler clientHandler = new ClientHandler(client);
            //啟動線程
            clientHandler.start();
        }

    }
    //客戶端消息處理
    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，用於數據輸出；服務器回送數據
                PrintStream socketOutput=new PrintStream(socket.getOutputStream());
                //得到輸入流，用於接收數據
                BufferedReader socketInput=new BufferedReader(
                        new InputStreamReader(
                                socket.getInputStream()));
                do {
                     //客戶端拿到數據
                    String str=socketInput.readLine();
                    if("bye".equalsIgnoreCase( str)){
                        flag=false;
                        //回送
                        socketOutput.println("bye");
                    }else{
                        //打印到屏幕，並且回送數據長度
                        System.out.println(str);
                        socketOutput.println("回送："+str.length());
                    }
                }while (flag);
                socketInput.close();
                socketOutput.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("客戶端已經退出："+socket.getInetAddress()   +
                    " P:"+socket.getPort());
        }
    }
}

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("已发起服务器连接，并且进入后续流程");
        System.out.println("客户信息："+socket.getLocalAddress()+" P:"+socket.getLocalPort());
        System.out.println("服务器信息："+socket.getInetAddress()+" P:"+socket.getPort());

        try {
            //发送接收数据
            todo(socket);
        }catch(Exception e){
            System.out.println("异常关闭");
        }
        //释放资源
        socket.close();
        System.out.println("客户端已退出~");
    }
    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Socket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();
            //发送到服务器
            socketPrintStream.println(str);


            String echo = socketBufferedReader.readLine();

            if ("bye".equalsIgnoreCase(echo)) {
                flag=false;
            }else{
                System.out.println(echo);
            }
        }while (flag);

        //資源釋放
        socketPrintStream.close();
        socketBufferedReader.close();
    }
}

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