Java - socket雙向通信例子

服務端

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class Server_1 {
    public static void main(String[] args) {
        InputStreamReader isr;
        BufferedReader br;
        OutputStreamWriter osw;
        BufferedWriter bw;
        String str;
        Scanner in = new Scanner(System.in);
        try {
            ServerSocket server = new ServerSocket(4444);// 在本機的4444端口開放Server

            Socket socket = server.accept();// 只要產生連接，socket便可以代表所連接的那個物體，同時這個server.accept()只有產生了連接纔會進行下一步操作。
            System.out.println(socket.getInetAddress());// 輸出連接者的IP。
            System.out.println("建立了一個連接！");
            while (true) {
                isr = new InputStreamReader(socket.getInputStream());
                br = new BufferedReader(isr);
                System.out.println(socket.getInetAddress() + ":" + br.readLine());
                osw = new OutputStreamWriter(socket.getOutputStream());
                bw = new BufferedWriter(osw);
                System.out.print("回覆:");
                str = in.nextLine();
                bw.write(str + "\n");
                bw.flush();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

客服端

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class Client_1 {
    public static void main(String[] args) {
        InputStreamReader isr;
        BufferedReader br;
        OutputStreamWriter osw;
        BufferedWriter bw;
        String str;
        Scanner in = new Scanner(System.in);
        try {
            Socket socket = new Socket("localhost", 4444);
//          System.out.println(socket.getInetAddress());// 輸出連接者的IP。
            System.out.println("成功連接服務器");
            while (true) {
                osw = new OutputStreamWriter(socket.getOutputStream());
                bw = new BufferedWriter(osw);
                System.out.print("回覆:");
                str = in.nextLine();
                bw.write(str + "\n");
                bw.flush();

                isr = new InputStreamReader(socket.getInputStream());
                br = new BufferedReader(isr);
                System.out.println(socket.getInetAddress() + ":" + br.readLine());
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}