Java模拟qq软件的详细过程

按照最初的写法，在登陆完毕后弹出聊天界面后会卡死，原因是当时登陆界面和聊天界面都是使用的主线程，我的代码没有写其他线程，无法多线程运行，因此在弹出聊天界面时线程不够用了，就卡在了监听线程里，因为在监听线程中再有新的监听就会被卡住。后将启动服务器和客户端的部分改为线程，就解决了此问题。改善后的代码简练和清晰了很多，更方便大家参考，代码如下：

登陆界面的实现

登陆界面主要使用了JFrame，以及相关的一些组件，并且在界面中加上监听
登陆界面效果图

Java模拟qq软件的详细过程

登陆界面代码Login类

package com.lding.net;

import javax.swing.*;
import java.awt.*;

/**
* @program: Chat
* @description:
* @author: 王丁
* @date: 2021-09-26 08:58
**/
public class Login{
  JTextField jTextField;


  public static void main(String[] args){
      Login login = new Login ();
      login.showUI ("kk");
  }

  public void showUI(String str){
      JFrame jf = new JFrame ();
      jf.setTitle ("❤️DDqq登陆界面❤️");
      jf.setSize (500, 400);
      jf.setDefaultCloseOperation (3);
      jf.setLocationRelativeTo (null);
      jf.setResizable (false);
      FlowLayout fl = new FlowLayout (FlowLayout.CENTER, 5, 5);
      jf.setLayout (fl);
      Dimension dim1 = new Dimension (500, 200);//图片大小
      Dimension dim2 = new Dimension (100, 50);//标签大小
      Dimension dim3 = new Dimension (300, 30);//输入框大小
      Dimension dim4 = new Dimension (100, 40);//按钮大小

      ImageIcon icon = new ImageIcon ("source/Login1.jpg");
      JLabel labimg = new JLabel (icon);
      labimg.setPreferredSize (dim1);
      jf.add (labimg);

      JLabel labuser = new JLabel ();
      labuser.setText ("user：");
      labuser.setPreferredSize (dim2);
      jf.add (labuser);
      JTextField textuser = new JTextField ();
      textuser.setPreferredSize (dim3);
      jf.add (textuser);

      JLabel labpassword = new JLabel ();
      labpassword.setText ("password：");
      labpassword.setPreferredSize (dim2);
      jf.add (labpassword);

      JPasswordField textPassword = new JPasswordField ();
      textPassword.setPreferredSize (dim3);
      jf.add (textPassword);

      JButton button = new JButton ();
      button.setBorder (BorderFactory.createRaisedBevelBorder ());
      button.setText ("login");
      button.setPreferredSize (dim4);
      jf.add (button);
      jf.setVisible (true);

      LoginListener ll = new LoginListener(textuser,textPassword, jf);
      button.addActionListener (ll);
      this.jTextField=ll.jTextField;

  }
}

login的监听类 LoginListener

package com.lding.net;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
* @program: Chat
* @description:
* @author: 王丁
* @date: 2021-09-26 08:59
**/
public class LoginListener implements ActionListener {
  JTextField jTextField;
  JPasswordField jPasswordField;
  JFrame jf ;
  LoginListener( JTextField jTextField,JPasswordField jPasswordField,JFrame jf){
      this.jf=jf;
      this.jTextField = jTextField;
      this.jPasswordField = jPasswordField;
  }
  @Override
  public void actionPerformed(ActionEvent e){
      if(jTextField.getText().equals("Alice")&&String.valueOf(jPasswordField.getPassword()).equals("1234")){
          System.out.println ("服务端登录！！");
          String name =jTextField.getText();
          new Server(name).start();
          jf.dispose();

      }else if(jTextField.getText().equals("Lding")&&String.valueOf(jPasswordField.getPassword()).equals("1234")){

          String name =jTextField.getText();
          System.out.println ("客户端登录！！");
          new Client(name).start();
          jf.dispose();
      }


  }
}

在登陆完毕后，需要跳转到聊天界面，这里采用的方法是通过一个flag标志来判断是否登陆完毕，当登陆完毕后，会创建新的聊天界面，并且登陆页面会被关闭
依然是双端通信，假定一端为客户端，一端为服务端，其实两端都可为用户。

聊天界面运行图

先登陆Alice的账号密码为123456

Java模拟qq软件的详细过程

登陆成功后显示ok，并等待连接

Java模拟qq软件的详细过程

再登陆冷丁的账号，密码为123456

Java模拟qq软件的详细过程

当lding账号登陆成功后完成连接，这时候会弹出两个新的JFram窗口，为聊天见面

Java模拟qq软件的详细过程

随后可以发送消息，消息可以实时显示时间，并显示用户名
一方发送的消息会在另一方的窗口上实时显示出来

Java模拟qq软件的详细过程

Client类代码

package com.lding.net;

import com.lding.ui.MsgUI;

import javax.swing.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
* @program: Chat
* @description: 客户端
* @author: 王丁
* @date: 2021-09-26 08:58
**/
public class Client extends  Thread{
  String name;

  public Client(String name) {
      this.name=name;
  }
  public static void main(String[] args) {
      String port="客户端";
      Login login=new Login();
      login.showUI(port);
  }

  @Override
  public void run(){
      try {
          startClient();
      } catch (IOException e) {
          e.printStackTrace ();
      }
  }

  void startClient() throws IOException{
      Socket socket=new Socket("127.0.0.1",8888);
      //输入 输出流对象
      InputStream inputStream=socket.getInputStream();
      OutputStream outputStream=socket.getOutputStream();
      MsgUI msgUI=new MsgUI(outputStream,name);
      JTextPane showmsgpane=msgUI.initUI("客户端");
      outputStream.flush();
      int count=1;
      while(true){
          int msglenth=inputStream.read();
          System.out.println("消息长度："+msglenth);
          byte[] msgbytes=new byte[msglenth];
          //将接下来的数据读入字节数组中
          inputStream.read(msgbytes);

          count++;
          if(count%2==0){
              SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
              String date = df.format(new Date());// new Date()为获取当前系统时间，也可使用当前时间戳
              String getmsg=new String(msgbytes);
              String msg=showmsgpane.getText();
              showmsgpane.setText(msg+date+"  ["+getmsg+"]"+"说:"+"\n");
          }else{
              String getmsg=new String(msgbytes);
              String msg=showmsgpane.getText();
              showmsgpane.setText(msg+getmsg+"\n");
          }
      }
  }
}

Server代码

package com.lding.net;

import com.lding.ui.MsgUI;

import javax.swing.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
* @program: Chat
* @description:
* @author: 王丁
* @date: 2021-09-26 08:58
**/
public class Server extends  Thread{
  JTextField jTextField;
  String name;
  public Server(String name){
      this.name=name;
  }
  public static void main(String[] args) {
      String port="服务端";
      Login login=new Login();
      login.showUI(port);
  }
  @Override
  public void run(){
      try {
          startServer();
      } catch (IOException e) {
          e.printStackTrace ();
      }
  }
  void startServer() throws IOException{
      ServerSocket serverSocket=new ServerSocket(8888);
      System.out.println("等待连接！！");
      Socket clientsocket=serverSocket.accept();//监听连接
      System.out.println("连接成功！！");
      InputStream inputStream=clientsocket.getInputStream();
      OutputStream outputStream=clientsocket.getOutputStream();

      MsgUI msgUI=new MsgUI(outputStream,name);
      JTextPane showmsgpane=msgUI.initUI("服务端");
      //outputStream.flush();
      int count=1;
      while(true){
          int msglenth=inputStream.read();
          System.out.println("消息长度是："+msglenth);
          byte[] msgbytes=new byte[msglenth];
          //将接下来的数据读入字节数组中
          inputStream.read(msgbytes);
          count++;
          if(count%2==0){
              SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
              String date = df.format(new Date());// new Date()为获取当前系统时间，也可使用当前时间戳
              String getmsg=new String(msgbytes);
              String msg=showmsgpane.getText();
              showmsgpane.setText(msg+date+"  ["+getmsg+"]"+"说:"+"\n");
          }else{
              String getmsg=new String(msgbytes);
              String msg=showmsgpane.getText();
              showmsgpane.setText(msg+getmsg+"\n");
          }
      }
  }
}

登陆界面代码

MsgUI

package com.lding.ui;

import javax.swing.*;
import java.awt.*;
import java.io.OutputStream;

/**
* @program: Chat
* @description:
* @author: 王丁
* @date: 2021-09-26 08:59
**/
public class MsgUI extends JFrame {

  OutputStream outputStream;
  String name;
  public MsgUI(OutputStream outputStream,String name){
      this.outputStream=outputStream;
      this.name=name;
  }
  public JTextPane initUI(String title){
      setTitle(title);
      setSize(800,800);
      setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      setLocationRelativeTo(null);
      setLayout(new FlowLayout());
      //接收显示框
      JTextPane jtp=new JTextPane();
      jtp.setPreferredSize(new Dimension(750,400));
      JScrollPane jsp=new JScrollPane(jtp);
      jtp.getText();
      Dimension dim=new Dimension(750,400);//按钮大小



      //发送框
      JTextPane jtp1=new JTextPane();
      jtp1.setPreferredSize(new Dimension(750,200));
      JScrollPane jsp1=new JScrollPane(jtp1);

      JButton btn=new JButton("发送");
      add(jsp);
      add(jsp1);
      add(btn);
      setVisible(true);

      MsgListener msgl=new MsgListener(jtp1,this.outputStream,name);
      btn.addActionListener(msgl);
      return jtp;
  }
}

MsgUIListener

package com.lding.ui;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.OutputStream;

/**
* @program: Chat
* @description:
* @author: 王丁
* @date: 2021-09-26 09:00
**/
public class MsgListener implements ActionListener {

  JTextPane jtp;
  OutputStream outputStream;
  String name;
  public  MsgListener(JTextPane jtp,OutputStream outputStream,String name){
      this.jtp=jtp;
      this.outputStream=outputStream;
      this.name=name;
  }
  @Override
  public void actionPerformed(ActionEvent e) {
      byte[] names=this.name.getBytes();
      try {
          outputStream.write(names.length);
          outputStream.write(names);
          outputStream.flush();
      } catch (IOException ex) {
          ex.printStackTrace();
      }


      String msg=jtp.getText();
      byte[] msgs=msg.getBytes();
      try {
          outputStream.write(msgs.length);
          outputStream.write(msgs);
          outputStream.flush();
      } catch (IOException ex) {
          ex.printStackTrace();
      }
      jtp.setText(null);
  }
}

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原文链接：https://blog.csdn.net/qq_41359998/article/details/120482564