socket聊天室实现-群聊，私聊，好友列表，完整版

￡神魔★判官ぃ 2022-12-01 14:16 173阅读 0赞

## 效果图 ##

登录。好友上线，下线均提示。  
![登录][20200406233437412.png]  
点击好友列表所有人，发送消息，既为群聊  
![群聊功能][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0Njk0NDQ1_size_16_color_FFFFFF_t_70]  
点击好友列表，好友名字，既为选中此好友进行私聊  
![私聊功能][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0Njk0NDQ1_size_16_color_FFFFFF_t_70 1]

## 服务器端代码 ##

**ChatRoomServer**

package sram.server;
    import java.io.IOException;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.util.HashMap;
    import sram.thread.ChatRoomServerReaderThread;
    import sram.user.User;
    
    public class ChatRoomServer {
    	private ServerSocket ss;
    	public static HashMap<User, Socket> online = new HashMap<User, Socket>(); 
    	public ChatRoomServer(){
    		try {
    			ss = new ServerSocket(6666);
    			System.out.println("服务器已经开启,等待客户端...");
    			while(true){
    				Socket s = ss.accept();
    				new Thread(new ChatRoomServerReaderThread(s)).start();
    			}			
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}		
    	}
    	public static void main(String[] args) {
    		new ChatRoomServer();
    	}	
    }

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**ChatRoomServerReaderThread**

package sram.thread;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.Socket;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Set;
    
    import sram.server.ChatRoomServer;
    import sram.user.Message;
    import sram.user.User;
    import sram.util.SendMessageUtil;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    public class ChatRoomServerReaderThread implements Runnable {
    	private Socket s;
    	private BufferedReader br;
    	private PrintWriter pw;
    	private Message message;
    	
    	public ChatRoomServerReaderThread(Socket s) throws IOException {
    		this.s = s;
    		br = new BufferedReader(new InputStreamReader(s.getInputStream()));
    		pw = new PrintWriter(s.getOutputStream(),true);
    	}
    
    
    	@Override
    	public void run() {
    		String str = null;
    		try {
    			while((str = br.readLine())!=null){
    				message = new Message(); //返回的消息。
    				System.out.println("发过来的消息是："+str);
    				Message msg = 
    					(Message) JSONObject.toBean
    						(JSONObject.fromObject(str), Message.class);
    				switch (msg.getType()) {
    				case 1: //处理登录消息。
    					User loginUser = msg.getFromUser();
    					if(ChatRoomServer.online.containsKey(loginUser)){
    						//用户名已经存在，不能登录
    						message.setType(11);
    						pw.println(JSONObject.fromObject(message).toString());
    					}else{
    						//用户名未存在，可以登录，返回可以登录的消息
    						//获取所有用户
    						List<User> users = new ArrayList<User>(ChatRoomServer.online.keySet());
    						//List转化为JSON字符串
    						message.setMessage(JSONArray.fromObject(users).toString());
    						message.setType(10);
    						ChatRoomServer.online.put(loginUser, s);
    						pw.println(JSONObject.fromObject(message).toString());
    						
    						//用户登录成功后，系统发送系统消息给每个用户，告诉所有用户 XXX上线了。
    						message.setType(4);
    						message.setFromUser(loginUser);
    						//调用群发方法，群发消息给所有用户。
    						SendMessageUtil.sendMessage(ChatRoomServer.online, message);
    					}
    					break;
    				case 3:
    					User out = msg.getFromUser();
    					ChatRoomServer.online.remove(out);
    					message.setType(5); 
    					message.setFromUser(out);
    					SendMessageUtil.sendMessage(ChatRoomServer.online, message);
    					break;
    				case 20: //处理私聊消息
    					User toUser = msg.getToUser();
    					Socket s = ChatRoomServer.online.get(toUser);
    					PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
    					msg.setType(22);
    					pw.println(JSONObject.fromObject(msg).toString());
    					break;
    				case 21: //处理群聊消息
    					msg.setType(23);
    					SendMessageUtil.sendMessage(ChatRoomServer.online,msg);
    					break;
    				}
    				if(msg.getType()==3){
    					break;
    				}
    			}			
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}	
    }

**Message**

package sram.user;
    
    //用来描述发送消息的类。 1登陆 2聊天 3退出  4系统消息等
    public class Message {
    	private String message; //发送消息内容
    	private int type; //发送消息类型
    	private User fromUser; //来源自谁的消息
    	private User toUser; //发送给谁
    	
    	public String getMessage() {
    		return message;
    	}
    	public void setMessage(String message) {
    		this.message = message;
    	}
    	public int getType() {
    		return type;
    	}
    	public void setType(int type) {
    		this.type = type;
    	}
    	public User getFromUser() {
    		return fromUser;
    	}
    	public void setFromUser(User fromUser) {
    		this.fromUser = fromUser;
    	}
    	public User getToUser() {
    		return toUser;
    	}
    	public void setToUser(User toUser) {
    		this.toUser = toUser;
    	}	
    }

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**User**

package sram.user;
    //用户实体类。登陆成功后，可以被保存在服务器端。
    public class User {
    	private String username; //用户名，唯一的标识
    	private String nickname;//用户自定义的网络名称
    	
    	
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getNickname() {
    		return nickname;
    	}
    	public void setNickname(String nickname) {
    		this.nickname = nickname;
    	}
    	public User(String username, String nickname) {
    		this.username = username;
    		this.nickname = nickname;
    	}
    	public User() {
    	}
    	@Override
    	public int hashCode() {
    		// TODO Auto-generated method stub
    		return 0;
    	}
    	@Override
    	public boolean equals(Object obj) {
    		User user = (User)obj;
    		return this.username.equals(user.username);
    	}
    }

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**SendMessageUtil**

package sram.util;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.net.Socket;
    import java.util.Map;
    import java.util.Set;
    
    import net.sf.json.JSONObject;
    
    import sram.user.Message;
    import sram.user.User;
    
    public class SendMessageUtil {
    	//群发的方法
    	public static void sendMessage(Map<User, Socket> online,Message message) throws IOException{
    		Set<User> users = online.keySet();
    		for(User user :users){
    			Socket s = online.get(user);
    			PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
    			pw.println(JSONObject.fromObject(message).toString());
    		}
    	}
    }

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## 客户端代码 ##

**ClientFrame**

package sram.frame;
    
    import java.awt.BorderLayout;
    import java.awt.ScrollPane;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.net.Socket;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.List;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JScrollBar;
    import javax.swing.JScrollPane;
    import javax.swing.JTextArea;
    import javax.swing.JTextField;
    import javax.swing.JTree;
    import javax.swing.border.Border;
    import javax.swing.border.TitledBorder;
    import javax.swing.tree.DefaultMutableTreeNode;
    import javax.swing.tree.DefaultTreeModel;
    
    import net.sf.json.JSONObject;
    
    import sram.user.Message;
    import sram.user.User;
    
    public class ClientFrame {
    	private JFrame frame; //主窗口
    	private JTextArea area; //显示消息的文本域
    	private JTextField text; //输入消息的文本框
    	private JButton btnSend; //发送消息的按钮
    	private JPanel p1,p2,p3; //布局使用的面板
    	private TitledBorder b1,b2,b3;
    	//好友列表使用JTree显示
    	private JTree tree;
    	private DefaultMutableTreeNode root;// 根节点
    	private DefaultTreeModel model; //树模型
    	
    	private User user;
    	private Socket socket;
    	private PrintWriter pw;
    	private User toUser = new User("All","所有人");
    	private List<User> friends;
    	
    	
    	
    	public DefaultMutableTreeNode getRoot() {
    		return root;
    	}
    	public void setRoot(DefaultMutableTreeNode root) {
    		this.root = root;
    	}
    	public DefaultTreeModel getModel() {
    		return model;
    	}
    	public void setModel(DefaultTreeModel model) {
    		this.model = model;
    	}
    	public User getUser() {
    		return user;
    	}
    	public void setUser(User user) {
    		this.user = user;
    	}
    	public JTextArea getArea() {
    		return area;
    	}
    	public void setArea(JTextArea area) {
    		this.area = area;
    	}
    	public ClientFrame(User user,Socket socket,List<User> friends){
    		this.user = user;//******************************************************
    		this.socket = socket;//**************************************************
    		this.friends = friends;//************************************************
    		//调用init()方法初始化界面
    		init();
    		listener();
    	}
    	//初始化方法显示界面
    	public void init(){
    		//初始化对象**********************************************
    		try {
    			pw = new PrintWriter(socket.getOutputStream(),true);
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    		frame = new JFrame("当前用户：["+user.getNickname()+"("+user.getUsername()+")"+"]");
    		area = new JTextArea();
    		area.setEditable(false);
    		area.setLineWrap(true);
    		text = new JTextField(20);
    		root = new DefaultMutableTreeNode("我的好友");
    		model = new DefaultTreeModel(root);
    		model.insertNodeInto(new DefaultMutableTreeNode(new User("All", "所有人")), root,root.getChildCount());
    		//************************************************************************************
    		if(friends!=null && friends.size()>0){
    			for(User userf : friends){
    				model.insertNodeInto(new DefaultMutableTreeNode(userf), root,root.getChildCount());
    			}
    		}
    		//************************************************************************************
    		tree = new JTree(model);
    		//启用折叠显示
    		tree.setShowsRootHandles(true);
    		btnSend = new JButton("发送");
    		b1 = new TitledBorder("好友列表");
    		b2 = new TitledBorder("消息显示");
    		b3 = new TitledBorder("发送消息");
    		p1 = new JPanel(); //右边的面板,用来显示好友列表
    		p2 = new JPanel(); //中间的面板,用来显示JTextArea
    		p3 = new JPanel(); //下边的面板,用来显示文本输入框和发送按钮
    		p1.setLayout(new BorderLayout());
    		p2.setLayout(new BorderLayout());
    		p1.setBorder(b1);
    		p2.setBorder(b2);
    		p3.setBorder(b3);
    		p1.add(new JScrollPane(tree));
    		p2.add(new JScrollPane(area,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER),BorderLayout.CENTER);
    		p3.add(text);
    		p3.add(btnSend);
    		p2.add(p3,BorderLayout.SOUTH);
    		frame.add(p1,BorderLayout.WEST);
    		frame.add(p2,BorderLayout.CENTER);
    		frame.setResizable(false);
    		frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    		frame.setSize(500, 450);
    		frame.setVisible(true);
    		
    	}
    	public void listener(){
    		frame.addWindowListener(new WindowAdapter() {
    			@Override
    			public void windowClosing(WindowEvent e) {
    				int i = JOptionPane.showConfirmDialog(null, "您确定要退出聊天室?");
    				if(i == JOptionPane.OK_OPTION){
    					Message message = new Message();
    					message.setType(3); //退出消息
    					message.setFromUser(user);
    					pw.println(JSONObject.fromObject(message).toString());
    					try {
    						Thread.sleep(100);
    						System.exit(0);
    					} catch (InterruptedException e1) {
    						// TODO Auto-generated catch block
    						e1.printStackTrace();
    					}
    				}
    			}
    		});
    		
    		tree.addMouseListener(new MouseAdapter() {
    			@Override
    			public void mouseClicked(MouseEvent e) {
    				if(tree.getSelectionPath()!=null && tree.getSelectionPath().getParentPath()!=null){
    					//获取点击节点的行数//*********************************************
    					int i = tree.getLeadSelectionRow();
    					DefaultMutableTreeNode node 
    						= (DefaultMutableTreeNode) root.getChildAt(i-1);
    					toUser = (User) node.getUserObject();
    					frame.setTitle("当前用户：["+user.getNickname()
    							+"("+user.getUsername()+")"+"] 和 ["+toUser.getNickname()
    							+"("+toUser.getUsername()+")"+"]的聊天");
    				}
    			}
    		});
    		btnSend.addActionListener(new ActionListener() {
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				//私聊 群聊
    				Date date = new Date();
    				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    				String msg = text.getText();
    				if(msg!=null && !msg.equals("")){
    					Message message = new Message();
    					message.setMessage(msg);
    					message.setFromUser(user);
    					text.setText("");
    					if(toUser!=null){
    						if(toUser.getUsername().equals("All")){
    							message.setType(21);
    							area.append("【群聊】"+user.getNickname()
    									+"("+user.getUsername()+") "+sdf.format(date)+" 说:");
    							area.append(msg+"\r\n");
    						}else{
    							message.setType(20);
    							area.append("【私聊】"+user.getNickname()
    									+"("+user.getUsername()+") "+sdf.format(date)+" 说:");
    							area.append(msg+"\r\n");
    						}
    					}
    					message.setToUser(toUser);
    					pw.println(JSONObject.fromObject(message).toString());
    				}
    			}
    		});
    		
    	}
    	public static void main(String[] args) {
    		//new ClientFrame(new User(),new Socket());
    	}	
    }

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**LoginFrame**

package sram.frame;
    
    import java.awt.Dimension;
    import java.awt.GridLayout;
    import java.awt.Toolkit;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.Socket;
    import java.net.UnknownHostException;
    import java.util.List;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    import sram.thread.ChatRoomClientReaderThread;
    import sram.user.Message;
    import sram.user.User;
    
    public class LoginFrame {
    	private JFrame frame;
    	private JLabel usernameLabel;
    	private JLabel nicknameLabel;
    	private JTextField usernameText;
    	private JTextField nicknameText;
    	private JButton btnRest;
    	private JButton btnLogin;
    	private JPanel p1,p2,p3;
    	public LoginFrame(){
    		init();
    		listener();
    	}
    	public void init(){
    		frame = new JFrame();
    		usernameLabel = new JLabel("用户名");
    		nicknameLabel = new JLabel("昵    称");
    		usernameText = new JTextField(10);
    		nicknameText = new JTextField(10);
    		btnRest = new JButton("重置");
    		btnLogin = new JButton("登录");
    		p1 = new JPanel();
    		p2 = new JPanel();
    		p3 = new JPanel();
    		frame.setLayout(new GridLayout(3, 1));
    		p1.add(usernameLabel);
    		p1.add(usernameText);
    		p2.add(nicknameLabel);
    		p2.add(nicknameText);
    		p3.add(btnRest);
    		p3.add(btnLogin);
    		frame.add(p1);
    		frame.add(p2);
    		frame.add(p3);
    		frame.setResizable(false);
    		frame.pack();
    		Toolkit t = Toolkit.getDefaultToolkit(); //获取工具包
    		Dimension d = t.getScreenSize(); //获取屏幕尺寸
    		frame.setLocation(d.width/2-175,d.height/2-40);
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.setVisible(true);
    	}
    	
    	public void listener(){
    		btnLogin.addActionListener(new ActionListener() {
    			
    			@Override
    			public void actionPerformed(ActionEvent e) {
    				String username = usernameText.getText();
    				String nickname = nicknameText.getText();
    				User user = new User(username,nickname);
    				Message msg = new Message();
    				msg.setType(1);
    				msg.setFromUser(user);
    				try {
    					Socket s = new Socket("127.0.0.1",6666);
    					PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
    					pw.println(JSONObject.fromObject(msg).toString());
    					
    					BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
    					String message = br.readLine();
    					System.out.println("客户端接受的消息是："+message);
    					Message msgReturn = 
    						(Message) JSONObject.toBean
    							(JSONObject.fromObject(message), Message.class);
    					switch (msgReturn.getType()) {
    					case 10:
    						System.out.println("开启聊天窗口");
    						String usersStr = msgReturn.getMessage();
    						List<User> list = JSONArray.toList(JSONArray.fromObject(usersStr),User.class);
    						ClientFrame f = new ClientFrame(user,s,list);
    						new Thread(new ChatRoomClientReaderThread(s, f)).start();
    						frame.setVisible(false);
    						break;
    					case 11:
    						s.close();
    						JOptionPane.showMessageDialog(null, "用户名已经存在，请重新输入后登录");
    						break;
    					default:
    						break;
    					}
    					
    				} catch (UnknownHostException e1) {
    					// TODO Auto-generated catch block
    					e1.printStackTrace();
    				} catch (IOException e1) {
    					// TODO Auto-generated catch block
    					e1.printStackTrace();
    				}
    			}
    		});
    	}
    	
    	public static void main(String[] args) {
    		new LoginFrame();
    	}
    }

**ChatRoomClientReaderThread**

package sram.thread;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.Socket;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    import net.sf.json.JSONObject;
    
    import sram.frame.ClientFrame;
    import sram.user.Message;
    import sram.user.User;
    import sram.util.FriendsTreeFlushUtil;
    
    public class ChatRoomClientReaderThread implements Runnable {
    	private Socket socket;
    	private BufferedReader br ;
    	private PrintWriter pw;
    	private ClientFrame frame;
    	
    	
    	public ChatRoomClientReaderThread(Socket socket,ClientFrame frame) throws IOException {
    		this.socket = socket;
    		this.frame = frame;
    		br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    		pw = new PrintWriter(socket.getOutputStream(),true);
    	}
    
    
    
    	@Override
    	public void run() {
    		String str = null;
    		try {
    			while((str = br.readLine())!=null){
    				Date date = new Date();
    				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    				System.out.println("客户端接收的消息是："+str);
    				Message msg = 
    					(Message) JSONObject.toBean
    						(JSONObject.fromObject(str), Message.class);
    				switch (msg.getType()) {
    				case 4: //系统登录消息。
    					User userLogin = msg.getFromUser();
    					if(userLogin.equals(frame.getUser())){
    						frame.getArea().append("[系统消息]:您成功上线了！\r\n");
    					}else{
    						frame.getArea().append("[系统消息]:您的好友"+userLogin.getNickname()+"("+userLogin.getUsername()+")上线了！\r\n");
    						//好友列表增加用户
    						FriendsTreeFlushUtil.insert(frame, userLogin);
    					}
    					break;
    				case 5: //系统退出消息
    					User out = msg.getFromUser();
    					frame.getArea().append("[系统消息]:您的好友"+out.getNickname()+"("+out.getUsername()+")下线了！\r\n");
    					//在好友列表中移除退出的用户
    					FriendsTreeFlushUtil.remove(frame, out);
    					break;
    				case 22: //客户端接收的私聊消息
    					User fromUser = msg.getFromUser();
    					String msgStr = msg.getMessage();
    					frame.getArea().append("【私聊】"+fromUser.getNickname()
    							+"("+fromUser.getUsername()+") "+sdf.format(date)+" 说:");
    					frame.getArea().append(msgStr+"\r\n");
    					break;
    				case 23: //客户端接收的群聊消息
    					User fromU = msg.getFromUser();
    					String msgS = msg.getMessage();
    					if(!frame.getUser().equals(fromU)){
    						frame.getArea().append("【群聊】"+fromU.getNickname()
    								+"("+fromU.getUsername()+") "+sdf.format(date)+" 说:");
    						frame.getArea().append(msgS+"\r\n");
    					}
    					break;
    				}
    				
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	}
    }

**Message**

package sram.user;
    
    //用来描述发送消息的类。 1登陆（10 成功  11 不成功） 2 (服务器（20 私聊   21 群聊）客户端（  22 私聊，23群聊 )聊天 3退出  4系统登录消息  5 系统退出消息等
    public class Message {
    	private String message; //发送消息内容
    	private int type; //发送消息类型
    	private User fromUser; //来源自谁的消息
    	private User toUser; //发送给谁
    	
    	public String getMessage() {
    		return message;
    	}
    	public void setMessage(String message) {
    		this.message = message;
    	}
    	public int getType() {
    		return type;
    	}
    	public void setType(int type) {
    		this.type = type;
    	}
    	public User getFromUser() {
    		return fromUser;
    	}
    	public void setFromUser(User fromUser) {
    		this.fromUser = fromUser;
    	}
    	public User getToUser() {
    		return toUser;
    	}
    	public void setToUser(User toUser) {
    		this.toUser = toUser;
    	}
    }

**User**

package sram.user;
    //用户实体类。登陆成功后，可以被保存在服务器端。
    public class User {
    	private String username; //用户名，唯一的标识
    	private String nickname;//用户自定义的网络名称
    
    	
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getNickname() {
    		return nickname;
    	}
    	public void setNickname(String nickname) {
    		this.nickname = nickname;
    	}
    	public User(String username, String nickname) {
    		this.username = username;
    		this.nickname = nickname;
    	}
    	public User() {
    	}
    	@Override
    	public boolean equals(Object obj) {
    		User user = (User)obj;
    		return this.username.equals(user.username);
    	}
    	@Override
    	public String toString() {
    		return nickname+"("+username+")";
    	}	
    }

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**FriendsTreeFlushUtil**

package sram.util;
    
    import java.util.Enumeration;
    
    import javax.swing.tree.DefaultMutableTreeNode;
    import javax.swing.tree.DefaultTreeModel;
    
    import sram.frame.ClientFrame;
    import sram.user.User;
    
    public class FriendsTreeFlushUtil {
    	public static void insert(ClientFrame frame,User u){
    		DefaultMutableTreeNode root = frame.getRoot();
    		DefaultTreeModel model = frame.getModel();
    		model.insertNodeInto(new DefaultMutableTreeNode(u), root, root.getChildCount());
    	}
    	public static void remove(ClientFrame frame,User u){
    		DefaultMutableTreeNode root = frame.getRoot();
    		DefaultTreeModel model = frame.getModel();
    		//获取所有的子节点
    		Enumeration<DefaultMutableTreeNode> children =  root.children();
    		while(children.hasMoreElements()){
    			DefaultMutableTreeNode node = children.nextElement();
    			User user = (User) node.getUserObject();
    			if(user.equals(u)){
    				model.removeNodeFromParent(node);
    			}
    		}
    		
    	}	
    }

[20200406233437412.png]: /images/20221123/34ee34506d2f478ab046d76160ca4b25.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0Njk0NDQ1_size_16_color_FFFFFF_t_70 1]: /images/20221123/1f195694325a4021a5b48b5dd3395d65.png