Java 基于Tcp/ip连接的多人交互聊天室(Socket编程）

项目说明：
本项目由三个.java文件（Client.java、Server.java、UI.java）和一个.jpg图片文件组成UI.java是负责界面的构成文件。本聊天室的界面极其简单。主要分为两个界面：第一个是启动时需要登陆的界面如下：

输入名字进去以后就可以直接聊天

这个聊天室相当于群聊，每一个登陆进去的人发的信息，其他人都会收到。
使用指南：1.运行Server.java文件，保证服务端的开启
2.运行UI.java文件，界面登陆。每运行一个UI文件并登陆进去，就代表一个客户进了群聊中，可进行对话。

程序简单易懂，非常适合初学者练习网络编程的知识。
Client.java

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

public class Client{

    String name;
    Socket s;
    UI ui;
    //构造方法 ，把UI对象传过来
    public Client(UI ui){
        this.ui = ui;
    }

    //从登陆界面获得名字并传去服务端
    public void getName(String name){
        try{
        s = new Socket("127.0.0.1",3000);
        Cli1 d = new Cli1(s,ui);
        d.start();
        this.name = name;
        DataOutputStream dos = new DataOutputStream(s.getOutputStream());
        dos.writeUTF(name);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    //从聊天界面获得要发送的内容并经服务器转发给各个客户端
    public void say(String content){
        try{
        DataOutputStream dos = new DataOutputStream(s.getOutputStream());
        dos.writeUTF(content);
        }catch(Exception e){
            e.printStackTrace();
        }
    }




}

//输入和输出
class Cli1 extends Thread {
    UI ui;
    Socket s ;
    public Cli1(Socket s,UI ui){
        this.s = s;
        this.ui=ui;
    }
    public void run(){
        try{
        while(true){

            DataInputStream dis = new DataInputStream(s.getInputStream());
            String content = dis.readUTF();
            if(!content.equals("")&&content!=null){
                System.out.println(content);
                ui.say(content);
            }

        }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

---

Server.java

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

public class Server{
    static Socket s;
    static Socket[] soc;
    static String[] name;
    static int k = 5,i =0,j;
    public static void main(String[] args){

        Server ser = new Server();
        try{
            ServerSocket ss = new ServerSocket(3000);


            soc = new Socket[k]; 
            name = new String[k];
            while(true){
                s = ss.accept();
                soc[i]= s;
                j=i;
                i++;
                DataOutputStream dos = new DataOutputStream(s.getOutputStream());   

                DataInputStream dis = new DataInputStream(s.getInputStream());
                name[j] = dis.readUTF();
                System.out.println(name[j]+"已进入群聊！");
                dos.writeUTF("欢迎你，"+name[j]);
                new Ser1().start();

            }
        }catch(ConnectException e){
            System.out.println("连接异常！！");

        }catch(IOException e){
            e.printStackTrace();
        }

    }



}

class Ser1 extends Thread{

    public int j;

    public void run(){
        try{
        DataInputStream read = new DataInputStream((Server.soc[Server.j]).getInputStream());
        j=Server.j;
        while(true){
            String con = read.readUTF();

            if(con!=null){


                System.out.println("该线程j为"+j);
                for(int i = 0;iif((i!=j)&&(Server.soc[i]!=null)){
                        DataOutputStream dos = new DataOutputStream((Server.soc[i]).getOutputStream()); 
                        dos.writeUTF(Server.name[Server.j]+"发送于 "+(new Date()));
                        dos.writeUTF(con);
                    }
                }


            }else{break;}
        }

    }catch(Exception e){
        e.printStackTrace();
    }
    }

}

UI.java

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

public class UI{

    //主方法
    public static void main(String[] args){

        UI ui = new UI();
        ui.cli = new Client(ui);
        ui.initFrame();
        ui.showLogin();
    }

    Ser1 ser1 = new Ser1();

    //初始化业务对象
    public Client cli = null;
    public void initCli(){

    }

    //初始化主窗口
    public int width = 720;
    public int height = 550;
    public JFrame jFrame = null;  //界面窗口
    public JLayeredPane layeredPane = null;  //层叠容器
    public JPanel backLayer = null;  //背景层
    public JPanel frontLayer = null;  //前景层
    public CardLayout cardLayout = null;  //前景层布局器

    public void initFrame(){
        jFrame = new JFrame("老友聚乐部");
        layeredPane = new JLayeredPane();
        layeredPane.setPreferredSize(new Dimension(width, height));
        jFrame.add(layeredPane);
        jFrame.setResizable(false);
        jFrame.pack();
         jFrame.setVisible(true);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        backLayer = new JPanel();
        ((FlowLayout)backLayer.getLayout()).setHgap(0);
        ((FlowLayout)backLayer.getLayout()).setVgap(0);
        backLayer.setSize(width,height);
        backLayer.setLocation(0,0);
        JLabel bg = new JLabel(new ImageIcon("12.jpg"));
        backLayer.add(bg);



        layeredPane.add(backLayer,new Integer(0));

        frontLayer = new JPanel();
        cardLayout = new CardLayout(0,0);
        frontLayer.setLayout(cardLayout);
        frontLayer.setOpaque(false);
        frontLayer.setSize(width,height);
        frontLayer.setLocation(0,0);

        layeredPane.add(frontLayer,new Integer(1));

    }

    //登录界面
    public JPanel loginPane = null;
    public JTextField loginCodeInput = null;

    public JLabel loginTipsLabel = null;
    public void showLogin(){
        if(loginPane == null){
            loginPane = new JPanel();
            loginPane.setOpaque(false);

            Box loginBox = Box.createVerticalBox();
            loginBox.add(Box.createVerticalStrut(180));

            JPanel welcome_panel = new JPanel();
            welcome_panel.setOpaque(false);
            JLabel welcome_label = new JLabel("老友俱乐部");

            welcome_label.setForeground(Color.WHITE);
            welcome_label.setFont(new Font("微软雅黑",Font.PLAIN,30));
            welcome_panel.add(welcome_label);
            loginBox.add(welcome_panel);

            loginBox.add(Box.createVerticalStrut(50));
            JPanel code_panel = new JPanel();
            code_panel.setOpaque(false);
            JLabel code_label = new JLabel("姓名：");
            code_label.setForeground(Color.WHITE);
            code_label.setFont(new Font("微软雅黑",Font.PLAIN,25));
            code_panel.add(code_label);
            loginCodeInput = new JTextField(10);
            loginCodeInput.setFont(new Font("微软雅黑", Font.PLAIN,25));
            code_panel.add(loginCodeInput);
            loginBox.add(code_panel);

            loginBox.add(Box.createVerticalStrut(30));

            JPanel btn_panel = new JPanel();
            btn_panel.setOpaque(false);
            JButton login_btn = new JButton("登 录");
            login_btn.setFont(new Font("微软雅黑",Font.PLAIN,15));
            btn_panel.add(login_btn);

            JButton reset_btn = new JButton("重 置");
            reset_btn.setFont(new Font("微软雅黑",Font.PLAIN,15));
            btn_panel.add(reset_btn);
            loginBox.add(btn_panel);

            loginBox.add(Box.createVerticalStrut(10));

            JPanel tips_panel = new JPanel();
            tips_panel.setOpaque(false);
            loginTipsLabel = new JLabel("");
            loginTipsLabel.setForeground(new Color(238,32,32));
            loginTipsLabel.setFont(new Font("微软雅黑",Font.PLAIN,20));
            tips_panel.add(loginTipsLabel);
            loginBox.add(tips_panel);

            loginPane.add(loginBox);

            frontLayer.add("loginPane",loginPane);
            cardLayout.show(frontLayer,"loginPane");
            frontLayer.validate();
            loginCodeInput.requestFocus();

            reset_btn.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent ae){
                    loginCodeInput.setText("");
                    loginTipsLabel.setText("");
                    loginCodeInput.requestFocus();
                }
            });

            login_btn.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent ae){
                    String code_str = loginCodeInput.getText();

                    if("".equals(code_str)){
                        loginTipsLabel.setText("姓名不能为空！");
                        loginCodeInput.requestFocus();

                    }else{

                        cli.getName(code_str);

                        showTalk();

                    }
                }
            });
        }else{
            cardLayout.show(frontLayer,"loginPane");
            loginCodeInput.setText("");

            loginTipsLabel.setText("");
            loginCodeInput.requestFocus();
        }
    }




    //聊天主界面
    public JPanel menuPane = null;
    public JTextArea input = null;
    public JTextArea talk  = new JTextArea(25,70);
    public void showTalk(){

            menuPane = new JPanel();
            menuPane.setOpaque(false);
            menuPane.setLayout(new BorderLayout());

            JPanel up = new JPanel();
            Box tipsBox = Box.createVerticalBox();
            menuPane.add(up,BorderLayout.NORTH); //北边顶上
            up.add(tipsBox);

            JLabel tips_label = new JLabel("在线朋友");
            tips_label.setForeground(Color.WHITE);
            tips_label.setFont(new Font("微软雅黑",Font.PLAIN,20));
            tips_label.setAlignmentX(Component.LEFT_ALIGNMENT);
            tipsBox.add(tips_label);
            tipsBox.add(Box.createVerticalStrut(10));
            JLabel upTxt = new JLabel("");  //接收在线朋友(需完善)

            tipsBox.add(upTxt);

            JPanel talk_panel = new JPanel();//中间聊天对话框
            talk_panel.setOpaque(false);

            menuPane.add(talk_panel,BorderLayout.WEST);

            JScrollPane sp = new JScrollPane(talk);
            talk_panel.add(talk);

            Box inputBox = Box.createHorizontalBox();  //下边输入框
            menuPane.add(inputBox,BorderLayout.SOUTH);

            JPanel input_panel = new JPanel();
            input_panel.setOpaque(false); //放置输入框
            input = new JTextArea(4,30);
            input.setFont(new Font("微软雅黑",Font.PLAIN,20));
            input.setAlignmentX(Component.LEFT_ALIGNMENT);
            input_panel.add(input);
            inputBox.add(input_panel);
            inputBox.add(Box.createHorizontalStrut(0));
            JButton send_btn = new JButton("发送");
            send_btn.setFont(new Font("微软雅黑",Font.PLAIN,15));
            inputBox.add(send_btn);

            frontLayer.add("menuPane",menuPane);
            cardLayout.show(frontLayer,"menuPane");
            frontLayer.validate();

            send_btn.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent ae){
                    String append = talk.getText();
                    String content = input.getText();
                    talk.setText(append+'\n'+content);
                    input.setText("");
                    cli.say(content);

                }
            });


    }
    public void say(String content){
        if(talk!=null){
            String append = talk.getText();

            talk.setText(append+'\n'+content);
        }



    }   

}

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