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Server side: package Server; import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.ArrayList;import java.util.List; import javax.swing.BorderFactory;import javax.swing.JFrame;import javax.swing.JButton;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JList;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException Public class ServerFrame extends JFrame implements ActionListener {private JButton jbt_start; private JButton jbt_stop; private JButton jbt_exit; private JTextArea jta_disMess; private JList jlt_disUsers; private Server server; public List online_usernames; public List online_usernameids; public ServerFrame (Server server) {this.server = server; online_usernames = new ArrayList (); online_usernameids = new ArrayList () Try {UIManager.setLookAndFeel (UIManager.getSystemLookAndFeelClassName ());} catch (ClassNotFoundException e) {e.printStackTrace ();} catch (InstantiationException e) {e.printStackTrace ();} catch (IllegalAccessException e) {e.printStackTrace ();} catch (UnsupportedLookAndFeelException e) {e.printStackTrace () } setTitle ("\ u670D\ u52A1\ u5668"); setIconImage (Toolkit.getDefaultToolkit (). GetImage ("Images/socket.jpg")); setSize (449,301); setResizable (false); WinCenter.center (this); addWindowListener (new WindowAdapter () {@ Override public void windowClosing (WindowEvent arg0) {jbt_exit.doClick () }); getContentPane (). SetLayout (null); jbt_start = new JButton ("\ u542F\ u52A8\ u670D\ u52A1\ u5668"); jbt_start.setBounds (32,23,103,34); jbt_start.addActionListener (this); getContentPane (). Add (jbt_start); jbt_stop = new JButton ("\ u505C\ u6B62\ u670D\ u52A1\ u5668") Jbt_stop.setBounds (145,23,103,34); jbt_stop.setEnabled (false); jbt_stop.addActionListener (this); getContentPane (). Add (jbt_stop); jbt_exit = new JButton ("\ u9000\ u51FA\ u670D\ u52A1\ u5668"); jbt_exit.setBounds (258,23,103,34); jbt_exit.addActionListener (this); getContentPane (). Add (jbt_exit) JScrollPane scrollPane = new JScrollPane (); scrollPane.setBounds (10,64,221,192); scrollPane.setWheelScrollingEnabled (true); scrollPane.setBorder (BorderFactory.createTitledBorder (chat message)); getContentPane () .add (scrollPane); jta_disMess = new JTextArea (); scrollPane.setViewportView (jta_disMess); JScrollPane scrollPane_1 = new JScrollPane () ScrollPane_1.setBounds (258,65,157,191); scrollPane_1.setBorder (BorderFactory.createTitledBorder); getContentPane (). Add (scrollPane_1); jlt_disUsers = new JList (); jlt_disUsers.setVisibleRowCount (4); scrollPane_1.setViewportView (jlt_disUsers);} / * * / private static final long serialVersionUID = 1L @ Override public void actionPerformed (ActionEvent arg0) {if (arg0.getSource () = = jbt_start) {jbt_start.setEnabled (false); jbt_stop.setEnabled (true); server.startServer ();} if (arg0.getSource () = = jbt_stop) {int flag = JOptionPane.showConfirmDialog (this, "do you want to stop the server?" , ", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE); if (flag = = JOptionPane.OK_OPTION) {server.stopServer (); jbt_start.setEnabled (true); jbt_stop.setEnabled (false) }} if (arg0.getSource () = = jbt_exit) {if (jbt_stop.isEnabled ()) {jbt_stop.doClick ();} server.close () }} public void setDisUsers (String userNames) {if (userNames.equals ("@ userlist")) {jlt_disUsers.removeAll (); String [] user_null = new String [] {}; jlt_disUsers.setListData (user_null) } else {if (userNames.contains ("@ userlist")) {String [] dis = userNames.split ("@ userlist"); String [] disUsernames = new String [dis.length / 2]; int j = 0; for (int I = 0; I)

< dis.length; i++) { disUsernames[j++] = dis[i++]; } jlt_disUsers.removeAll(); jlt_disUsers.setListData(disUsernames); } if (userNames.contains("@exit")) { String[] dis = {}; jlt_disUsers.setListData(dis); } } } public void setDisMess(String message) { if (message.contains("@chat")) { int local = message.indexOf("@chat"); jta_disMess.append(message.substring(0, local) + "\n"); jta_disMess.setCaretPosition(jta_disMess.getText().length()); } if (message.contains("@exit")) { jta_disMess.setText(""); } } public void setStartAndStopUnable() { JOptionPane.showMessageDialog(this, "不能同时开启两个服务器"); jbt_start.setEnabled(false); jbt_stop.setEnabled(false); }} 设置窗口居中代码： package Server; import java.awt.Dimension;import java.awt.Toolkit;import java.awt.Window; public class WinCenter { public static void center(Window win) { Toolkit tkit = Toolkit.getDefaultToolkit(); Dimension sSize = tkit.getScreenSize(); Dimension wSize = win.getSize(); if (wSize.height >

< infos.length; i++) { int id_user = 0; try { id_user = Integer.parseInt(infos[i]); if (client.getThreadID() == id_user) { if (!client.username.equals(infos[i - 1])) { JOptionPane.showMessageDialog(this, "由于有同名的用户登录，所以您的用户名后面加上了编号"); client.username = infos[i - 1]; this.setTitle("聊天室 " + client.username); break; } else { break; } } else { i++; } } catch (Exception e) { } } if (infos.length == 2) { String[] s = new String[]{}; if (!client.c_singleFrames.isEmpty()) { ListModel list = jlt_disUsers.getModel(); for (int i = 0; i < list.getSize(); i++) { if (client.c_singleFrames.get(list.getElementAt(i)) != null) { client.c_singleFrames.get(list.getElementAt(i)) .setExitNotify(); } } } jlt_disUsers.removeAll(); jlt_disUsers.setListData(s); } else { if ((infos.length / 2 - 1) < client.username_online.size()) { // 有人下线 List rec = new ArrayList(); int i = 0; for (; i < infos.length; i++) { rec.add(0, infos[i++]); } for (i = 0; i < client.username_online.size(); i++) { if (!rec.contains(client.username_online.get(i))) { break; } } String name = client.username_online.get(i); client.username_online.remove(i); try { client.clientuserid.remove(i); } catch (Exception e) { e.printStackTrace(); } if (client.c_singleFrames.containsKey(name)) { client.c_singleFrames.get(name).closeSingleFrame(); client.c_singleFrames.remove(name); } } else { List online = new ArrayList(); for (int i = 0; i < client.username_online.size(); i++) { online.add(0, client.clientuserid.get(i)); } if (online.isEmpty()) { for (int i = 1; i < infos.length; i++) { if ((int) Integer.parseInt(infos[i]) != client .getThreadID()) { client.username_online.add(0, infos[i - 1]); client.clientuserid.add(0, Integer.parseInt(infos[i])); } i++; } } else { for (int i = 1; i < infos.length; i++) { if (Integer.parseInt(infos[i]) != client.getThreadID()) { if (!online.contains(Integer.parseInt(infos[i]))) { client.username_online.add(0, infos[i - 1]); client.clientuserid.add(0, Integer.parseInt(infos[i])); } else { String name = client.username_online .get(client.clientuserid .indexOf(Integer .parseInt(infos[i]))); if (!name.equals(infos[i - 1])) { if (client.c_singleFrames.containsKey(name)) { Client_singleFrame cf = client.c_singleFrames .get(name); cf.setTitle(name); client.c_singleFrames.remove(name); client.c_singleFrames.put(name, cf); cf.setVisible(false); } client.username_online.remove(name); client.clientuserid.remove(new Integer( Integer.parseInt(infos[i]))); client.username_online.add(0, infos[i - 1]); client.clientuserid.add(0, Integer.parseInt(infos[i])); } } } i++; } } } try { for (int i = 0; i < client.username_online.size(); i++) { info[i] = client.username_online.get(i); } } catch (Exception e) { } jlt_disUsers.removeAll(); jlt_disUsers.setListData(info); } } public void closeClient() { JOptionPane.showMessageDialog(this, "服务器已关闭", "提示", JOptionPane.OK_OPTION); client.exitClient(); setVisible(false); } @Override public void valueChanged(ListSelectionEvent e) { if (e.getSource() == jlt_disUsers) { } } public void createSingleChatFrame(String name) { Client_singleFrame c_singlFrame = new Client_singleFrame(client, name); client.c_singleFrames.put(name, c_singlFrame); try { c_singlFrame.userThreadID = client.clientuserid .get(client.username_online.indexOf(name)); } catch (Exception e) { } c_singlFrame.setVisible(true); } public void setSingleFrame(String chat_re) { String[] infos = chat_re.split("@single"); try { if (client.c_singleFrames.containsKey(infos[0])) { client.c_singleFrames.get(infos[0]).setDisMess(infos[3]); } else { createSingleChatFrame(infos[0]); client.c_singleFrames.get(infos[0]).setDisMess(infos[3]); } } catch (Exception e) { } }} 单人聊天界面 package Client; import java.awt.BorderLayout;import java.awt.Component;import java.awt.Container;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date; import javax.swing.BorderFactory;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException; public class Client_singleFrame extends JFrame implements ActionListener, KeyListener { /** * */ private static final long serialVersionUID = 1L; private static JTextArea jta_disMess; private JTextField jtf_inputMess; private JButton jbt_trans; public int userThreadID = 0; private Client client; public Client_singleFrame(Client client, String title) { this.client = client; init(title); } private void init(String title) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException e1) { e1.printStackTrace(); } catch (InstantiationException e1) { e1.printStackTrace(); } catch (IllegalAccessException e1) { e1.printStackTrace(); } catch (UnsupportedLookAndFeelException e1) { e1.printStackTrace(); } setIconImage(Toolkit.getDefaultToolkit().getImage("Images/socket.jpg")); WinCenter.center(this); setTitle(title); setSize(400, 400); setResizable(false); setContentPane(createContentPanel()); addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { closeSingleFrame(); } }); } private Container createContentPanel() { JPanel jp = new JPanel(); jp.setBorder(BorderFactory.createTitledBorder("聊天消息")); jp.setLayout(new BorderLayout()); jta_disMess = new JTextArea(); jta_disMess.setEditable(false); jp.add(BorderLayout.CENTER, new JScrollPane(jta_disMess)); jp.add(BorderLayout.SOUTH, createInput()); return jp; } private Component createInput() { JPanel jp = new JPanel(); jp.setBorder(BorderFactory.createTitledBorder("发送消息")); jp.setLayout(new BorderLayout()); jtf_inputMess = new JTextField(); jtf_inputMess.addKeyListener(this); jbt_trans = new JButton("发送"); jbt_trans.addActionListener(this); jp.add(jtf_inputMess, BorderLayout.CENTER); jp.add(jbt_trans, BorderLayout.EAST); return jp; } @Override public void keyPressed(KeyEvent arg0) { if (arg0.getKeyCode() == KeyEvent.VK_ENTER) { if (arg0.getSource() == jtf_inputMess) { jbt_trans.doClick(); } } } @Override public void keyReleased(KeyEvent arg0) { } @Override public void keyTyped(KeyEvent arg0) { } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == jbt_trans) { String str = jtf_inputMess.getText(); str.trim(); jtf_inputMess.setText(""); if (str.equals("")) { JOptionPane.showMessageDialog(this, "信息不能为空"); } else { SimpleDateFormat form = new SimpleDateFormat("yyyy-MM-dd HH:mm"); String date = form.format(new Date()); String mess = client.username + " " + date + "\n" + str; jta_disMess.append(mess + "\n"); jta_disMess.setCaretPosition(jta_disMess.getText().length()); int index = client.username_online.indexOf(this.getTitle()); String info = client.username + "@single" + client.getThreadID() + "@single" + (int) client.clientuserid.get(index) + "@single" + mess + "@single"; try { client.dos.writeUTF(info); } catch (IOException e1) { e1.printStackTrace(); } } } } public void setDisMess(String chat_re) { jta_disMess.append(chat_re + "\n"); jta_disMess.setCaretPosition(jta_disMess.getText().length()); } public void closeSingleFrame() { client.c_singleFrames.remove(this.getTitle()); setVisible(false); } public void setExitNotify() { jta_disMess.append(this.getTitle() + "已下线....."); jbt_trans.setEnabled(false); }} 设置窗体居中 package Client; import java.awt.Dimension;import java.awt.Toolkit;import java.awt.Window; public class WinCenter { public static void center(Window win) { Toolkit tkit = Toolkit.getDefaultToolkit(); Dimension sSize = tkit.getScreenSize(); Dimension wSize = win.getSize(); if (wSize.height >

SSize.height) {wSize.height = sSize.height;} if (wSize.width > sSize.width) {wSize.width = sSize.width;} win.setLocation ((sSize.width-wSize.width) / 2, (sSize.height-wSize.height) / 2) }} the above is the content of this article on "how to implement chat room interface in Java". I believe we all have some understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please follow the industry information channel.

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