基于java网络聊天室--服务器端
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ChatServer.java
包含名为ChatServer的public类，其主要功能为定义服务器端的界面，添加时间监听与时间处理。调用ServerListen类来实现服务端用户上线与下线的监听，调用ServerListen来实现服务器端的消息收发。
1 package com.silianbo.server; 2 3 import com.silianbo.CaptureScreen; 4 import java.awt.BorderLayout; 5 import java.awt.Container; 6 import java.awt.Dimension; 7 import java.awt.GridBagConstraints; 8 import java.awt.GridBagLayout; 9 import java.awt.Insets; 10 import java.awt.Toolkit; 11 import java.awt.event.ActionEvent; 12 import java.awt.event.ActionListener; 13 import java.awt.event.WindowAdapter; 14 import java.awt.event.WindowEvent; 15 import java.net.ServerSocket; 16 import javax.swing.JButton; 17 import javax.swing.JComboBox; 18 import javax.swing.JFrame; 19 import javax.swing.JLabel; 20 import javax.swing.JMenu; 21 import javax.swing.JMenuBar; 22 import javax.swing.JMenuItem; 23 import javax.swing.JOptionPane; 24 import javax.swing.JPanel; 25 import javax.swing.JScrollPane; 26 import javax.swing.JTextArea; 27 import javax.swing.JTextField; 28 import javax.swing.JToolBar; 29 import javax.swing.UIManager; 30 import javax.swing.UnsupportedLookAndFeelException; 31 32 public final class ChatServer extends JFrame implements ActionListener { 33 34 private static final long serialVersionUID = 1L; 35 36 public static int port = 8888; 37 38 ServerSocket serverSocket; 39 40 JComboBox combobox; 41 42 JTextArea messageShow; 43 44 JScrollPane messageScrollPane; 45 46 JTextField showStatus; 47 48 JLabel sendToLabel, messageLabel; 49 50 JTextField sysMessage; 51 52 JButton sysMessageButton; 53 54 UserLinkList userLinkList; 55 56 JMenuBar jMenuBar = new JMenuBar(); 57 58 JMenu serviceMenu = new JMenu("服务"); 59 60 JMenuItem portItem = new JMenuItem("端口设置"); 61 62 JMenuItem startItem = new JMenuItem("启动服务"); 63 64 JMenuItem stopItem = new JMenuItem("停止服务"); 65 66 JMenuItem exitItem = new JMenuItem("退出"); 67 68 JMenu helpMenu = new JMenu("帮助"); 69 70 JMenuItem helpItem = new JMenuItem("帮助"); 71 72 JToolBar toolBar = new JToolBar(); 73 74 JButton portSet; 75 76 JButton startServer; 77 78 JButton stopServer; 79 80 JButton exitButton; 81 82 JButton uploadButton; 83 84 Dimension faceSize = new Dimension(550, 550); 85 86 ServerListen listenThread; 87 88 JPanel downPanel; 89 90 GridBagLayout girdBag; 91 92 GridBagConstraints girdBagCon; 93 94 public ChatServer() { 95 init(); 96 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 97 this.pack(); 98 this.setSize(faceSize); 99 Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();100 this.setLocation((int) (screenSize.width - faceSize.getWidth()) / 2, (int) (screenSize.height - faceSize.getHeight()) / 2);101 this.setResizable(false);102 this.setTitle("聊天室服务器端");103 setVisible(true);104 }105 106 public void init() {107 Container contentPane = getContentPane();108 contentPane.setLayout(new BorderLayout());109 serviceMenu.add(startItem);110 serviceMenu.add(stopItem);111 serviceMenu.add(exitItem);112 jMenuBar.add(serviceMenu);113 helpMenu.add(helpItem);114 JMenu add = jMenuBar.add(helpMenu);115 setJMenuBar(jMenuBar);116 portSet = new JButton("端口设置");117 startServer = new JButton("启动服务");118 stopServer = new JButton("停止服务");119 exitButton = new JButton("退出");120 toolBar.add(portSet);121 toolBar.addSeparator();122 toolBar.add(startServer);123 toolBar.add(stopServer);124 toolBar.addSeparator();125 toolBar.add(exitButton);126 contentPane.add(toolBar, BorderLayout.NORTH);127 stopServer.setEnabled(false);128 stopItem.setEnabled(false);129 portItem.addActionListener(this);130 startItem.addActionListener(this);131 stopItem.addActionListener(this);132 exitItem.addActionListener(this);133 helpItem.addActionListener(this);134 portSet.addActionListener(this);135 startServer.addActionListener(this);136 stopServer.addActionListener(this);137 exitButton.addActionListener(this);138 combobox = new JComboBox();139 combobox.insertItemAt("所有人", 0);140 combobox.setSelectedIndex(0);141 messageShow = new JTextArea();142 messageShow.setEditable(false);143 messageScrollPane = new JScrollPane(messageShow, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);144 messageScrollPane.setPreferredSize(new Dimension(400, 400));145 messageScrollPane.revalidate();146 showStatus = new JTextField(25);147 showStatus.setEditable(false);148 sysMessage = new JTextField(25);149 sysMessage.setEnabled(false);150 sysMessageButton = new JButton();151 sysMessageButton.setText("发送");152 sysMessage.addActionListener(this);153 sysMessageButton.addActionListener(this);154 sendToLabel = new JLabel("发送至:");155 messageLabel = new JLabel("发送消息:");156 downPanel = new JPanel();157 girdBag = new GridBagLayout();158 downPanel.setLayout(girdBag);159 girdBagCon = new GridBagConstraints();160 girdBagCon.gridx = 0;161 girdBagCon.gridy = 0;162 girdBagCon.gridwidth = 3;163 girdBagCon.gridheight = 2;164 girdBagCon.ipadx = 5;165 girdBagCon.ipady = 5;166 JLabel none = new JLabel(" ");167 girdBag.setConstraints(none, girdBagCon);168 downPanel.add(none);169 girdBagCon = new GridBagConstraints();170 girdBagCon.gridx = 0;171 girdBagCon.gridy = 2;172 girdBagCon.insets = new Insets(1, 0, 0, 0);173 girdBagCon.ipadx = 5;174 girdBagCon.ipady = 5;175 girdBag.setConstraints(sendToLabel, girdBagCon);176 downPanel.add(sendToLabel);177 girdBagCon = new GridBagConstraints();178 girdBagCon.gridx = 1;179 girdBagCon.gridy = 2;180 girdBagCon.anchor = GridBagConstraints.LINE_START;181 girdBag.setConstraints(combobox, girdBagCon);182 downPanel.add(combobox);183 girdBagCon = new GridBagConstraints();184 girdBagCon.gridx = 0;185 girdBagCon.gridy = 3;186 girdBag.setConstraints(messageLabel, girdBagCon);187 downPanel.add(messageLabel);188 girdBagCon = new GridBagConstraints();189 girdBagCon.gridx = 1;190 girdBagCon.gridy = 3;191 girdBag.setConstraints(sysMessage, girdBagCon);192 downPanel.add(sysMessage);193 girdBagCon = new GridBagConstraints();194 girdBagCon.gridx = 2;195 girdBagCon.gridy = 3;196 girdBag.setConstraints(sysMessageButton, girdBagCon);197 downPanel.add(sysMessageButton);198 girdBagCon = new GridBagConstraints();199 girdBagCon.gridx = 0;200 girdBagCon.gridy = 4;201 girdBagCon.gridwidth = 3;202 girdBag.setConstraints(showStatus, girdBagCon);203 downPanel.add(showStatus);204 contentPane.add(messageScrollPane, BorderLayout.CENTER);205 contentPane.add(downPanel, BorderLayout.SOUTH);206 this.addWindowListener(new WindowAdapter() {207 208 @Override209 public void windowClosing(WindowEvent e) {210 stopService();211 System.exit(0);212 }213 });214 }215 216 @Override217 public void actionPerformed(ActionEvent e) {218 Object obj = e.getSource();219 if (obj == startServer || obj == startItem) {220 startService();221 } else if (obj == stopServer || obj == stopItem) {222 int j = JOptionPane.showConfirmDialog(this, "真的停止服务吗?", "停止服务", JOptionPane.YES_OPTION, JOptionPane.QUESTION_MESSAGE);223 if (j == JOptionPane.YES_OPTION) {224 stopService();225 }226 } else if (obj == portSet || obj == portItem) {227 PortConf portConf = new PortConf(this);228 portConf.setVisible(true);229 } else if (obj == exitButton || obj == exitItem) {230 int j = JOptionPane.showConfirmDialog(this, "真的要退出吗?", "退出", JOptionPane.YES_OPTION, JOptionPane.QUESTION_MESSAGE);231 if (j == JOptionPane.YES_OPTION) {232 stopService();233 System.exit(0);234 }235 } else if (obj == helpItem) {236 CaptureScreen.RandomName.Help helpDialog = new CaptureScreen.RandomName.Help(this);237 helpDialog.setVisible(true);238 } else if (obj == sysMessage || obj == sysMessageButton) {239 sendSystemMessage();240 }241 }242 243 public void startService() {244 try {245 serverSocket = new ServerSocket(port, 10);246 messageShow.append("服务端已经启动，在" + port + "端口侦听...\n");247 startServer.setEnabled(false);248 startItem.setEnabled(false);249 portSet.setEnabled(false);250 portItem.setEnabled(false);251 stopServer.setEnabled(true);252 stopItem.setEnabled(true);253 sysMessage.setEnabled(true);254 } catch (Exception e) {255 }256 userLinkList = new UserLinkList();257 listenThread = new ServerListen(serverSocket, combobox, messageShow, showStatus, userLinkList);258 listenThread.start();259 }260 261 public void stopService() {262 try {263 sendStopToAll();264 listenThread.isStop = true;265 serverSocket.close();266 int count = userLinkList.getCount();267 int i = 0;268 while (i < count) {269 Node node = userLinkList.findUser(i);270 node.input.close();271 node.output.close();272 node.socket.close();273 i++;274 }275 stopServer.setEnabled(false);276 stopItem.setEnabled(false);277 startServer.setEnabled(true);278 startItem.setEnabled(true);279 portSet.setEnabled(true);280 portItem.setEnabled(true);281 sysMessage.setEnabled(false);282 messageShow.append("服务端已经关闭\n");283 combobox.removeAllItems();284 combobox.addItem("所有人");285 } catch (Exception e) {286 }287 }288 289 public void sendStopToAll() {290 int count = userLinkList.getCount();291 int i = 0;292 while (i < count) {293 Node node = userLinkList.findUser(i);294 if (node == null) {295 i++;296 continue;297 }298 try {299 node.output.writeObject("服务关闭");300 node.output.flush();301 } catch (Exception e) {302 }303 i++;304 }305 }306 307 public void sendMsgToAll(String msg) {308 int count = userLinkList.getCount();309 int i = 0;310 while (i < count) {311 Node node = userLinkList.findUser(i);312 if (node == null) {313 i++;314 continue;315 }316 try {317 node.output.writeObject("系统信息");318 node.output.flush();319 node.output.writeObject(msg);320 node.output.flush();321 } catch (Exception e) {322 }323 i++;324 }325 sysMessage.setText("");326 }327 328 public void sendSystemMessage() {329 String toSomebody = combobox.getSelectedItem().toString();330 String message = sysMessage.getText() + "\n";331 messageShow.append(message);332 if (toSomebody.equalsIgnoreCase("所有人")) {333 sendMsgToAll(message);334 } else {335 Node node;336 node = userLinkList.findUser(toSomebody);337 try {338 node.output.writeObject("系统信息");339 node.output.flush();340 node.output.writeObject(message);341 node.output.flush();342 } catch (Exception e) {343 }344 sysMessage.setText("");345 }346 }347 348 public static void main(String[] args) {349 try {350 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());351 } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) {352 }353 ChatServer chatServer = new ChatServer();354 }355 }
ServerListen.java
该类实现服务器用户上线与下线的监听。该类对用户上线下线的监听是通过调用用户链表类（UserLinkList）来实现的。当用户上线与下线情况发生变化时，该类会对主类的界面进行相应的修改。
1 package com.silianbo.server; 2 3 import javax.swing.*; 4 import java.io.*; 5 import java.net.*; 6 7 public class ServerListen extends Thread { 8 9 ServerSocket server;10 11 JComboBox combobox;12 13 JTextArea textarea;14 15 JTextField textfield;16 17 UserLinkList userLinkList;18 19 Node client;20 21 ServerReceive recvThread;22 23 public boolean isStop;24 25 public ServerListen(ServerSocket server, JComboBox combobox, JTextArea textarea, JTextField textfield, UserLinkList userLinkList) {26 this.server = server;27 this.combobox = combobox;28 this.textarea = textarea;29 this.textfield = textfield;30 this.userLinkList = userLinkList;31 isStop = false;32 }33 34 @Override35 public void run() {36 while (!isStop && !server.isClosed()) {37 try {38 client = new Node();39 client.socket = server.accept();40 client.output = new ObjectOutputStream(client.socket.getOutputStream());41 client.output.flush();42 client.input = new ObjectInputStream(client.socket.getInputStream());43 client.username = (String) client.input.readObject();44 combobox.addItem(client.username);45 userLinkList.addUser(client);46 textarea.append("用户 " + client.username + " 上线" + "\n");47 textfield.setText("在线用户" + userLinkList.getCount() + "人\n");48 recvThread = new ServerReceive(textarea, textfield, combobox, client, userLinkList);49 recvThread.start();50 } catch (IOException | ClassNotFoundException e) {51 }52 }53 }54 }
ServerReceive.java
该类是实现服务器消息收发的类，该类分别定义了向某用户及所有人发送消息的方法，发送的消息会显示在主界面类的街面上。
1 package com.silianbo.server; 2 3 import java.io.IOException; 4 import javax.swing.*; 5 6 public class ServerReceive extends Thread { 7 8 JTextArea textarea; 9 10 JTextField textfield; 11 12 JComboBox combobox; 13 14 Node client; 15 16 UserLinkList userLinkList; 17 18 public boolean isStop; 19 20 public ServerReceive(JTextArea textarea, JTextField textfield, JComboBox combobox, Node client, UserLinkList userLinkList) { 21 this.textarea = textarea; 22 this.textfield = textfield; 23 this.client = client; 24 this.userLinkList = userLinkList; 25 this.combobox = combobox; 26 isStop = false; 27 } 28 29 @Override 30 public void run() { 31 sendUserList(); 32 while (!isStop && !client.socket.isClosed()) { 33 try { 34 String type = (String) client.input.readObject(); 35 if (type.equalsIgnoreCase("聊天信息")) { 36 String toSomebody = (String) client.input.readObject(); 37 String status = (String) client.input.readObject(); 38 String action = (String) client.input.readObject(); 39 String message = (String) client.input.readObject(); 40 String msg = client.username + " " + action + "对 " + toSomebody + " 说 : " + message + "\n"; 41 if (status.equalsIgnoreCase("悄悄话")) { 42 msg = " [悄悄话] " + msg; 43 } 44 textarea.append(msg); 45 if (toSomebody.equalsIgnoreCase("所有人")) { 46 sendToAll(msg); 47 } else { 48 try { 49 client.output.writeObject("聊天信息"); 50 client.output.flush(); 51 client.output.writeObject(msg); 52 client.output.flush(); 53 } catch (Exception e) { 54 } 55 Node node = userLinkList.findUser(toSomebody); 56 if (node != null) { 57 node.output.writeObject("聊天信息"); 58 node.output.flush(); 59 node.output.writeObject(msg); 60 node.output.flush(); 61 } 62 } 63 } else if (type.equalsIgnoreCase("用户下线")) { 64 Node node = userLinkList.findUser(client.username); 65 userLinkList.delUser(node); 66 String msg = "用户 " + client.username + " 下线\n"; 67 int count = userLinkList.getCount(); 68 combobox.removeAllItems(); 69 combobox.addItem("所有人"); 70 int i = 0; 71 while (i < count) { 72 node = userLinkList.findUser(i); 73 if (node == null) { 74 i++; 75 continue; 76 } 77 combobox.addItem(node.username); 78 i++; 79 } 80 combobox.setSelectedIndex(0); 81 textarea.append(msg); 82 textfield.setText("在线用户" + userLinkList.getCount() + "人\n"); 83 sendToAll(msg); 84 sendUserList(); 85 break; 86 } 87 } catch (IOException | ClassNotFoundException e) { 88 } 89 } 90 } 91 92 public void sendToAll(String msg) { 93 int count = userLinkList.getCount(); 94 int i = 0; 95 while (count > 0) { 96 Node node = userLinkList.findUser(i); 97 if (node == null) { 98 i++; 99 continue;100 }101 try {102 node.output.writeObject("聊天信息");103 node.output.flush();104 node.output.writeObject(msg);105 node.output.flush();106 } catch (Exception e) {107 }108 i++;109 }110 }111 112 public void sendUserList() {113 String userlist = "";114 int count = userLinkList.getCount();115 int i = 0;116 while (i < count) {117 Node node = userLinkList.findUser(i);118 if (node == null) {119 i++;120 continue;121 }122 userlist += node.username;123 userlist += '\n';124 i++;125 }126 i = 0;127 while (i < count) {128 Node node = userLinkList.findUser(i);129 if (node == null) {130 i++;131 continue;132 }133 try {134 node.output.writeObject("用户列表");135 node.output.flush();136 node.output.writeObject(userlist);137 node.output.flush();138 } catch (Exception e) {139 }140 i++;141 }142 }143 }
PortConf.java
该类继承自Jdialog，是用户对服务器端监听端口进行修改配置的类
1 /* 2 * To change this license header, choose License Headers in Project Properties. 3 * To change this template file, choose Tools | Templates 4 * and open the template in the editor. 5 */ 6 package com.silianbo.server; 7 8 /** 9 * 10 * @author silianbo 11 * 生成端口设置对话框的类 12 */ 13 import java.awt.*; 14 import javax.swing.*; 15 import java.awt.event.*; 16 17 18 public class PortConf extends JDialog { 19 /** 20 * 21 */ 22 private static final long serialVersionUID = 1L; 23 JPanel panelPort = new JPanel(); 24 JButton save = new JButton(); 25 JButton cancel = new JButton(); 26 public static JLabel DLGINFO=new JLabel( 27 " 默认端口号为:8888"); 28 29 JPanel panelSave = new JPanel(); 30 JLabel message = new JLabel(); 31 32 public static JTextField portNumber ; 33 34 public PortConf(JFrame frame) { 35 super(frame, true); 36 try { 37 jbInit(); 38 } 39 catch (Exception e) { 40 } 41 //设置运行位置，使对话框居中 42 Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); 43 this.setLocation( (int) (screenSize.width - 400) / 2 + 50, 44 (int) (screenSize.height - 600) / 2 + 150); 45 this.setResizable(false); 46 } 47 48 private void jbInit() throws Exception { 49 this.setSize(new Dimension(300, 120)); 50 this.setTitle("端口设置"); 51 message.setText("请输入侦听的端口号:"); 52 portNumber = new JTextField(10); 53 portNumber.setText(""+ChatServer.port); 54 save.setText("保存"); 55 cancel.setText("取消"); 56 57 panelPort.setLayout(new FlowLayout()); 58 panelPort.add(message); 59 panelPort.add(portNumber); 60 61 panelSave.add(new Label(" ")); 62 panelSave.add(save); 63 panelSave.add(cancel); 64 panelSave.add(new Label(" ")); 65 66 Container contentPane = getContentPane(); 67 contentPane.setLayout(new BorderLayout()); 68 contentPane.add(panelPort, BorderLayout.NORTH); 69 contentPane.add(DLGINFO, BorderLayout.CENTER); 70 contentPane.add(panelSave, BorderLayout.SOUTH); 71 72 //保存按钮的事件处理 73 save.addActionListener((ActionEvent a) -> { 74 int savePort; 75 try{ 76 77 savePort=Integer.parseInt(PortConf.portNumber.getText()); 78 79 if(savePort<1 || savePort>65535){ 80 PortConf.DLGINFO.setText(" 侦听端口必须是0-65535之间的整数!"); 81 PortConf.portNumber.setText(""); 82 return; 83 } 84 ChatServer.port = savePort; 85 dispose(); 86 } 87 catch(NumberFormatException e){ 88 PortConf.DLGINFO.setText(" 错误的端口号,端口号请填写整数!"); 89 PortConf.portNumber.setText(""); 90 } 91 }); 92 93 //关闭对话框时的操作 94 this.addWindowListener( 95 new WindowAdapter(){ 96 @Override 97 public void windowClosing(WindowEvent e){ 98 DLGINFO.setText(" 默认端口号为:8888"); 99 }100 }101 );102 103 //取消按钮的事件处理104 cancel.addActionListener((ActionEvent e) -> {105 DLGINFO.setText(" 默认端口号为:8888");106 dispose();107 });108 }109 }
Help.java
服务端程序帮助类。
1 mport java.awt.*; 2 import javax.swing.*; 3 import java.awt.event.*; 4 5 /** 6 * 生成设置对话框的类 7 */ 8 public class Help extends JDialog { 9 10 /**11 * 12 */13 private static final long serialVersionUID = 1L;14 JPanel titlePanel = new JPanel();15 JPanel contentPanel = new JPanel();16 JPanel closePanel = new JPanel();17 18 JButton close = new JButton();19 JLabel title = new JLabel("聊天室服务端帮助");20 JTextArea help = new JTextArea(); 21 22 Color bg = new Color(255,255,255);23 24 public Help(JFrame frame) {25 super(frame, true);26 try {27 jbInit();28 }29 catch (Exception e) {30 e.printStackTrace();31 }32 //设置运行位置，使对话框居中33 Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();34 this.setLocation( (int) (screenSize.width - 400) / 2,35 (int) (screenSize.height - 320) / 2);36 this.setResizable(false);37 }38 39 private void jbInit() throws Exception {40 this.setSize(new Dimension(400, 200));41 this.setTitle("帮助");42 43 titlePanel.setBackground(bg);;44 contentPanel.setBackground(bg);45 closePanel.setBackground(bg);46 47 help.setText("1、设置服务端的侦听端口（默认端口为8888）。\n"+48 "2、点击 启动服务 按钮便可在指定的端口启动服务。\n"+49 "3、选择需要接受消息的用户，在消息栏中写入消息，之后便可发送消息。\n"+50 "4、信息状态栏中显示服务器当前的启动与停止状态、"+51 "用户发送的消息和\n 服务器端发送的系统消息。");52 help.setEditable(false);53 54 titlePanel.add(new Label(" "));55 titlePanel.add(title);56 titlePanel.add(new Label(" "));57 58 contentPanel.add(help);59 60 closePanel.add(new Label(" "));61 closePanel.add(close);62 closePanel.add(new Label(" "));63 64 Container contentPane = getContentPane();65 contentPane.setLayout(new BorderLayout());66 contentPane.add(titlePanel, BorderLayout.NORTH);67 contentPane.add(contentPanel, BorderLayout.CENTER);68 contentPane.add(closePanel, BorderLayout.SOUTH);69 70 close.setText("关闭");71 //事件处理72 close.addActionListener(73 new ActionListener() {74 public void actionPerformed(ActionEvent e) {75 dispose();76 }77 }78 );79 }80 }
UserLinkList.java
用户链表节点的具体实现类。该类通过构造函数构造用户链表，定义了添加用户、删除用户、返回用户数、根据用户名查找用户、根据索引查找用户这5个方法。
1 package com.silianbo.server; 2 3 public class UserLinkList { 4 5 Node root; 6 7 Node pointer; 8 9 int count;10 11 public UserLinkList() {12 root = new Node();13 root.next = null;14 pointer = null;15 count = 0;16 }17 18 public void addUser(Node n) {19 pointer = root;20 while (pointer.next != null) {21 pointer = pointer.next;22 }23 pointer.next = n;24 n.next = null;25 count++;26 }27 28 public void delUser(Node n) {29 pointer = root;30 while (pointer.next != null) {31 if (pointer.next == n) {32 pointer.next = n.next;33 count--;34 break;35 }36 pointer = pointer.next;37 }38 }39 40 public int getCount() {41 return count;42 }43 44 public Node findUser(String username) {45 if (count == 0)46 return null;47 pointer = root;48 while (pointer.next != null) {49 pointer = pointer.next;50 if (pointer.username.equalsIgnoreCase(username)) {51 return pointer;52 }53 }54 return null;55 }56 57 public Node findUser(int index) {58 if (count == 0) {59 return null;60 }61 if (index < 0) {62 return null;63 }64 pointer = root;65 int i = 0;66 while (i < index + 1) {67 if (pointer.next != null) {68 pointer = pointer.next;69 } else {70 return null;71 }72 i++;73 }74 return pointer;75 }76 }
Node.java
用户链表的节点类，定义了链表中的用户。该类与前面所讲的链表节点Node类的功能相当
1 package com.silianbo.server; 2 3 import java.net.*; 4 import java.io.*; 5 6 public class Node { 7 8 String username = null; 9 10 Socket socket = null;11 12 ObjectOutputStream output = null;13 14 ObjectInputStream input = null;15 16 Node next = null;17 }
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