Java 聊天程序案例

分手后的思念是犯贱 2024-03-22 21:15 113阅读 0赞

单线程版本：

import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.util.Scanner;
    
    //服务端
    public class Server {
        public static void main(String[] args) {
            try {
                //Socket套接字(TCP/IP)
                //设置端口号
                ServerSocket server = new ServerSocket(6666);
                Socket s = server.accept();
                PrintWriter out = new PrintWriter(s.getOutputStream());
                BufferedReader br = new BufferedReader(new
                        InputStreamReader(s.getInputStream()));
                System.out.println("已连接");
                while (true) {
    
                    String sss = br.readLine();
                    System.out.println(sss);
                    System.out.print("请回复消息：");
                    out.write((new Scanner(System.in)).nextLine()+"\r\n");
                    out.flush();
                }
            } catch (Exception e) {
                System.out.println(e.toString());
            }
        }
    }

import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.Socket;
    import java.util.Scanner;
    //客户端
    public class Client {
        public static void main(String[] args) {
            try {
                //输入服务端的ip地址和端口号
                //ip地址可以用控制台ipconfig命令查询
                Socket s = new Socket("192.168.21.28", 6666);
                BufferedReader br = new BufferedReader(new
                        InputStreamReader(s.getInputStream()));
                PrintWriter out = new PrintWriter(s.getOutputStream());
                while (true) {
                    System.out.print("请输入：");
                    String sss = (new Scanner(System.in)).nextLine();
                    out.write(sss+"\r\n");
                    out.flush();
                    System.out.println(br.readLine());
                }
            } catch (Exception e) {
                System.out.println(e.toString());
            }
        }
    }

A发完1条消息后，B回复1条后，A才能继续发送1条消息，B也同理

![8431f23c870841e3aab4baf1b08a400f.png][]

多线程版本：Server、Client、Read接收类、Send发送类

import java.io.*;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.nio.charset.StandardCharsets;
    import java.util.List;
    import java.util.Scanner;
    
    /**
     * Server.java 是服务端类，还有Read线程类，Send线程类
     */
    public class Server {
        public static void main(String[] args) {
            try {
                ServerSocket server = new ServerSocket(6688);
                //accept()将会有一个中断等待
                Socket a = server.accept();
                System.out.println("有人连线");
                new Thread(new Read(a)).start();
                new Thread(new Send(a, "服务器")).start();
            } catch (IOException e) {
                System.out.println("服务器启动失败，端口6688被占用");
            }
        }
    }
    
    class Read implements Runnable {
        Socket ss = null;
    
        public Read(Socket ss) {
            this.ss = ss;
        }
    
        @Override
        public void run() {
            BufferedReader br = null;
            try {
                br = new BufferedReader(new
                        InputStreamReader(ss.getInputStream()));
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            while (true) {
                String sss = null;
                try {
                    sss = br.readLine();
                    System.out.println(sss);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
    
    class Send implements Runnable {
        String name = "";
        Socket ss = null;
    
        public Send(Socket ss, String name) {
            this.ss = ss;
            this.name = name;
        }
    
        @Override
        public void run() {
            PrintWriter out = null;
            try {
                out = new PrintWriter(ss.getOutputStream());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            while (true) {
                out.printf("%s:%s\r\n", name, new Scanner(System.in).nextLine());
                out.flush();
            }
        }
    }

import java.net.Socket;
    
    public class Client {
        public static void main(String[] args) {
            try {
                Socket c = new Socket("192.168.21.28", 6688);
                new Thread(new Read(c)).start();
                new Thread(new Send(c, "客户")).start();
            } catch (Exception e) {
            }
        }
    }

连接后可以随时发送和接收

![1d32c494d6664b50a36d93bb15939955.png][]

[8431f23c870841e3aab4baf1b08a400f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/a62858f2a21c4bd0aee5cfcf8ba5e5f0.png
[1d32c494d6664b50a36d93bb15939955.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/14/8121c17d9de34f97a4fb764e8605ee6f.png