swing+socket实现多人聊天程序

1.准备工作

先看效果：

java 多客户端聊天室 java 多人聊天_swing

  • 客户端项目结构图：

java 多客户端聊天室 java 多人聊天_swing_02

  • 服务端项目结构图：

java 多客户端聊天室 java 多人聊天_socket_03

2.运行原理

  • 服务端

先开一个线程serverListerner，线程中开启一个Serversocket
用Serversocket.accept()监听指定端口
一旦有socket连接进来，就为该socket开启一个线程，用于读取该socket输入流的信息，一旦有信息，就通知其他客户端
并将线程保存到Vector<ChartThread> 集合内，交给ChatThreadManager管理，主要是处理分发消息

  • 客户端:

点击connect按钮和服务端建立连接，客户端会开启线程随时监听socket的输入流
服务端accept后就会为该socket建立线程，监控该socket的流信息
当客户端点击发送按钮时，将文本框内的信息，写进socket中，此时服务端的线程抓到了socket的输入流信息，就让ChatThreadManager管理类，去通知集合内其他socket，为多个socket写入相同的信息，那么其余的客户端就收到消息了，实现了多人聊天的功能

 

3.核心代码

  • 服务端：

StartServer.java

Main函数入口，实例ServerListener类，并开启该线程

package com.chart;

public class StartServer
{
   public static void main(String[] args)
   {
	   new ServerListener().start();
   }
}

ServerListener.java:

用Serversocket.accept()监听指定端口,一旦有socket连接进来，就为该socket开启一个ChatThread线程
并将ChatThread线程保存到Vector<ChartThread> 集合内，交给ChatThreadManager管理,

package com.chart;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.JOptionPane;


public class ServerListener extends Thread{
   
	public void run()
	{
		try {
			ServerSocket serversocket= new ServerSocket(23456);
			while(true) {
			Socket socket=serversocket.accept();  //进程会阻塞在这句，直到有socket连接进来，就往下执行
	        System.out.println("one client has connected");
			ChatThread cs=new ChatThread(socket);
			cs.start();
			ChatThreadManager.getChartManager().add(cs);
			}  
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

ChatThread:

在此线程中监听客户端socket的来信 并调用publish()方法，通知ChatThreadManager类

package com.chart;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Socket;

public class ChatThread extends Thread {
	
	Socket socket;

	public ChatThread(Socket s) {
		this.socket = s;
	}

	public void out(String out) {
		try {
			socket.getOutputStream().write(out.getBytes("UTF-8"));
		} catch (Exception e) {
		}
	}

	public void run() {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
			String line = "";
			while ((line = br.readLine()) != null) {
				System.out.println(line);
				ChatThreadManager.getChartManager().publish(this, line);
			}
			br.close();
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
}

 ChatThreadManager.java

单例类，构造函数私有，管理多个ChatThread, 用于通知其他客户端

package com.chart;

import java.util.Vector;

public class ChatThreadManager {

	private ChatThreadManager() {

	}

	private static final ChatThreadManager Cm = new ChatThreadManager();

	public static ChatThreadManager getChartManager() {
		return Cm;
	}

	Vector<ChatThread> ChatSocket_vector = new Vector<ChatThread>();

	public void add(ChatThread cs) {
		ChatSocket_vector.add(cs);
	}

	public void publish(ChatThread cs, String msg) {
		for (int i = 0; i < ChatSocket_vector.size(); i++) {
			ChatThread csTemp = ChatSocket_vector.get(i);
			if (!cs.equals(csTemp)) {
				csTemp.out(msg + "\n");
			}
		}
	}
}

 

  • 客户端：

StartClient.java:

main 函数入口，新建主窗体，并显示

package com.client;

import java.awt.EventQueue;

import view.MyClientWindow;

public class StartClient {

	public static void main(String[] args) {
	  EventQueue.invokeLater(new Runnable() {
		
		@Override
		public void run() {
			try {
				MyClientWindow frame=new MyClientWindow();
				frame.setVisible(true);
				ConnectionManager.getChatManager().setWindow(frame);
			}
			catch (Exception e) {
			}
		}
	});
	}
}

MyClientWindow.java:

继承JFrame,布局窗体，connect按钮执行建立连接事件，send按钮则往socket中写入发送信息

package view;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.border.EmptyBorder;

import com.client.ConnectionManager;

public class MyClientWindow extends JFrame {

	private static final long serialVersionUID = 1L;
	private JPanel contentPane;
	private JTextArea txt;
	private JTextField txtip;
	private JTextField txtSend;

	public MyClientWindow() {
		setAlwaysOnTop(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);

		txt = new JTextArea();
		txt.setText("准备...");

		txtip = new JTextField();
		txtip.setText("120.254.12.102");
		txtip.setColumns(10);

		JButton btnConnect = new JButton("connect");
		btnConnect.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				ConnectionManager.getChatManager().connect(txtip.getText());
			}
		});

		txtSend = new JTextField();
		txtSend.setText("hello");
		txtSend.setColumns(10);

		JButton btnSend = new JButton("send");
		btnSend.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				ConnectionManager.getChatManager().send(txtSend.getText());
				appendText("我说: " + txtSend.getText());
				txtSend.setText("");
			}
		});
		GroupLayout gl_contentPane = new GroupLayout(contentPane);

		gl_contentPane.setHorizontalGroup(gl_contentPane.createParallelGroup(Alignment.LEADING).addGroup(
				Alignment.TRAILING,
				gl_contentPane.createSequentialGroup().addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
						.addGroup(gl_contentPane.createSequentialGroup()
								.addComponent(txtSend, GroupLayout.DEFAULT_SIZE, 325, Short.MAX_VALUE)
								.addPreferredGap(ComponentPlacement.RELATED)
								.addComponent(btnSend, GroupLayout.PREFERRED_SIZE, 109, GroupLayout.PREFERRED_SIZE))
						.addGroup(Alignment.LEADING,
								gl_contentPane.createSequentialGroup()
										.addComponent(txtip, GroupLayout.PREFERRED_SIZE, 294,
												GroupLayout.PREFERRED_SIZE)
										.addPreferredGap(ComponentPlacement.RELATED)
										.addComponent(btnConnect, GroupLayout.DEFAULT_SIZE, 140, Short.MAX_VALUE))
						.addComponent(txt, GroupLayout.DEFAULT_SIZE, 434, Short.MAX_VALUE)).addContainerGap()));

		gl_contentPane.setVerticalGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
				.addGroup(gl_contentPane.createSequentialGroup()
						.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
								.addComponent(txtip, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE,
										GroupLayout.PREFERRED_SIZE)
								.addComponent(btnConnect))
						.addPreferredGap(ComponentPlacement.RELATED)
						.addComponent(txt, GroupLayout.DEFAULT_SIZE, 198, Short.MAX_VALUE)
						.addPreferredGap(ComponentPlacement.RELATED)
						.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING).addComponent(btnSend)
								.addComponent(txtSend, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE,
										GroupLayout.PREFERRED_SIZE))));

		contentPane.setLayout(gl_contentPane);
	}

	/* 客户端发送的内容添加到中间的txt控件中 */
	public void appendText(String in) {
		txt.append("\n" + in);
	}
}

ConnectionManager.java

package com.client;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import view.MyClientWindow;

public class ConnectionManager {
	private ConnectionManager() {
	}

	private static final ConnectionManager instance = new ConnectionManager();

	public static ConnectionManager getChatManager() {
		return instance;
	}

	MyClientWindow window;// 为了能在界面上显示服务器发来的信息，就需要传一个MainWindow的引用进来
	Socket socket;
	private String IP;
	BufferedReader bReader;
	PrintWriter pWriter;

	public void setWindow(MyClientWindow window) {
		this.window = window;
	}

	public void connect(String ip) {
		this.IP = ip;
		new Thread() {
			@Override
			public void run() {
				// 实现网络方法
				try {
					socket = new Socket(IP, 23456);
                    // 输出流 
					pWriter = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
					// 输入流
					bReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
					String line = null;
					// 如果读取数据为空
					while ((line = bReader.readLine()) != null) {
						window.appendText("收到： " + line);
					}
					// 读完数据之后要关闭
					pWriter.close();
					bReader.close();
					pWriter = null;
					bReader = null;
				} catch (UnknownHostException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}.start();
	}

	public void send(String sendMsg) {
		if (pWriter != null) {
			pWriter.write(sendMsg + "\n");
			pWriter.flush();
		} else {
			window.appendText("当前链接已经中断...");
		}
	}
}

 

4.运行服务端程序：

1.把MainServerPro服务端程序导出成jar包

2.用xshell把jar包上传到linux

3.程序选用了23456端口，因为部署在阿里云的服务器上，所以要打开阿里云的端口限制

java 多客户端聊天室 java 多人聊天_swing_04

4.关闭centos7的防火墙

# service firewalld status; #查看防火墙状态

java 多客户端聊天室 java 多人聊天_java 多客户端聊天室_05

 （disabled 表明 已经禁止开启启动 enable 表示开机自启，inactive 表示防火墙关闭状态 activated（running）表示为开启状态）

# service firewalld start;  #开启防火墙

# service firewalld stop;  #关闭防火墙

 

5.启动服务，运行MainServerPro.jar

有以下三种方式，选择第二种：java -jar xxxxx.jar &  

java -jar xxxxx.jar  // 当前ssh窗口被锁定，可按CTRL + C打断程序运行，或直接关闭窗口，程序退出

java -jar xxxxx.jar &   //当前ssh窗口不被锁定，但是当窗口关闭时，程序中止运行。

nohup Java -jar xxxxxx.jar &  //不挂断运行命令,当账户退出或终端关闭时,程序仍然运行

 

6.最后启动客户端，进行聊天

在点击connect的时候出现报错：

 Exception in thread "Thread-0" java.awt.HeadlessException:  No X11 DISPLAY variable was set, but this program performed an operation which requires it.

原因是因为服务端程序中有一句JOptionPane.showMessageDialog(null, "one client has connect to 12345 port");

在linux这种不支持图形界面的环境中 调用图形界面swing有关的代码时，会抛出异常。。。

解决方法很粗暴，直接把这句代码删掉