Java练习项目——在线聊天室

Posted 2022-07-22 wx62c1784d5ac8a

Java练习项目——在线聊天室

话不多说，先上源码：

server端：

import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer 

    boolean stated = false;
    ServerSocket ss = null;
    //创建集合，存储子线程
    List<Client> clients = new ArrayList<>();

    public static void main(String[] args)
        new ChatServer().start();
    

    public void start() 
        try 
            ss = new ServerSocket(8888);
            stated = true;
        catch (BindException e) 
            System.out.println("running ...");
            System.exit(0);
        catch (IOException e)
            e.printStackTrace();
               
        try 
            //stated = true;
            while (stated) 
                Socket s = ss.accept();
                Client c = new Client(s);
System.out.println("a client connecied!");
                new Thread(c).start();
                clients.add(c);
                //dis.close();
            
        catch (IOException e)
            e.printStackTrace();
            //System.out.println("closed!");
        finally 
            try 
                ss.close();
             catch (IOException e) 
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            
        
    

    class Client implements Runnable 
        private Socket s;
        private DataInputStream dis = null;
        private boolean bConnected = false;
        private DataOutputStream dos = null;

        public Client(Socket s) 
            this.s = s;
            try 
                dis = new DataInputStream(s.getInputStream());
                dos = new DataOutputStream(s.getOutputStream());
                bConnected = true;
             catch (IOException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
            
        

        public void send(String str) 
            try 
                dos.writeUTF(str);
             catch (IOException e) 
                clients.remove(this);
                System.out.println("对方退出了，list去除！");
            
        

        public void run() 
            try 
                while(bConnected) 
                    String str = dis.readUTF();
System.out.println(str);
                    //将接受的数据发送给客户端
                    for (int i=0;i<clients.size();i++) 
                        Client c = clients.get(i);
                        c.send(str);
                    
                
             catch (EOFException e) 
                System.out.println("Client closed!");
             catch (IOException e) 
                e.printStackTrace();
             finally 
                try 
                    if(dis != null) dis.close();
                    if(dos != null) dos.close();
                    if(s != null) s.close();
                 catch (IOException e1) 
                    e1.printStackTrace();
                
            
        
    

client端：

//导入Java包
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class ChatClient extends Frame

    boolean bConnected = false;
    //创建成员变量
    DataOutputStream dos = null;
    DataInputStream dis = null;
    //创建socket成员变量
    Socket s = null;
    //TextField单行文本框
    TextField tfText = new TextField();
    // TextArea多行文本框
    TextArea taContent = new TextArea();
    //成员变量
    Thread tRecv = new Thread(new RecvThread());

    public static void main(String[] args) 
        //创建对象并调用方法
        ChatClient q = new ChatClient();
        q.launchFrame();
    

    //创建窗体方法
    public void launchFrame() 
        //调整窗口大小
        setLocation(400,300);
        this.setSize(300,300);
        //在窗口的北（上）方，南（下）方添加文本框
        add(tfText, BorderLayout.SOUTH);
        add(taContent, BorderLayout.NORTH);
        //隐藏多余窗口区域
        pack();
        this.addWindowListener(new WindowAdapter()
            //重写WindowAdapter()类的windowClosing方法
            //实现点击关闭终止程序
            @Override
            public void windowClosing(WindowEvent e) 
                disconnect();
                System.exit(0);
            
        );
        //调用Button类中的addActionListener方法
        tfText.addActionListener(new TextListener());
        setVisible(true);
        connect();
        tRecv.start();
    

    //创建客户端连接服务器方法
    public void connect() 
        //使用try/catch语句防止错误异常抛出
        try 
            s = new Socket("127.0.0.1",8888);
            dis = new DataInputStream(s.getInputStream());
            dos = new DataOutputStream(s.getOutputStream());
System.out.println("connected!");
            bConnected = true;
         catch (UnknownHostException e) 
            //找不到主机异常
            e.printStackTrace();
         catch (IOException e) 
            //输入错误，连接错误
            //e.printStackTrace();
            System.out.println("输入错误，连接失败");
        

    

    //添加清理方法，关闭套接字时将内存等清理
    public void disconnect() 
        try 
            dos.close();
            dis.close();
            s.close();
         catch (IOException e) 
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        
    

    //创建继承于ActionListener的类
    private class TextListener implements ActionListener

        //重写actionPerformed方法
        public void actionPerformed(ActionEvent e) 
            String str = tfText.getText().trim();
            //taContent.setText(str);
            tfText.setText("");
            try 
                dos.writeUTF(str);
                dos.flush();
                //dos.close();
             catch (IOException e1) 
                e1.printStackTrace();
            
        

    

    private class RecvThread implements Runnable 

        public void run() 
            try 
                while (bConnected) 
                    String str = dis.readUTF();
                    //System.out.println(str);
                    taContent.setText(taContent.getText() + str + "\\n");
                
            catch (SocketException e) 
                System.out.println("退出了，bye!");
            catch (IOException e) 
                e.printStackTrace();
            
        
    

PS：该练习可实现类似在线聊天系统的小功能，本人的第一个的练习，还有很多不足之处，请各位大佬指教。