This is a few years ago , An interview question from Sina ~ The requirement is 3 Within days ~
adopt TCP agreement , Build a server side .
Server side configuration IP And port ：
Clients can communicate with each other ~
Once online, all online users will receive your online notification .
After offline, all online users will receive your offline notification ！
You can talk in private , You can group chat .
This is the first version ~ You can add more functions when you are free ~ For example, sending files ~ wait ~
The design idea is as follows ：
On the server side Use one HashMap< userName,socket> Maintain all user related information , So as to ensure communication with all users .
Client actions ：
（1） Connect （ Sign in ）： send out userName Corresponding actions of the server ：1) Interface display ,2) Inform other users about your login information , 3) Put other online users userName Notify the current user 4) Start a thread to serve the current thread
（2） sign out （ Cancellation ）:
（3） Send a message
※※ After sending the communication content , How does the other person know what to do , Through message protocol ：
The format design of the message sent by the client to the server ：
Command key @# The receiving party @# The message content @# The sender
1) Connect ：userName —- Handshake thread serverSocket Receive this message exclusively , Others are newly opened by the server to communicate with customers socket To receive
2) sign out ：[email protected]# All @#[email protected]#userName
3) send out : on @# JList.getSelectedValue() @# tfdMsg.getText() @# tfdUserName.getText()
The format design of the message sent by the server to the client ：
Command key @# The sender @# The message content
Sign in ：
1) msg @#server @# user [userName] Log on to the ( Display to the client )
2) [email protected]#server @# userName ( For the client to maintain the online user list )
sign out ：
1) msg @#server @# user [userName] Out of the ( Display to the client )
2) [email protected]#server @# userName ( For the client to maintain the online user list )
send out :
msg @# Message sender ( msgs[3] ) @# The message content (msgs[2])
Server side source code ：
package cn.hncu;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
/**
* The server
*
* @author Chen Haoxiang
*
* @version 1.0 2016-5-13
*/
public class ServerForm extends JFrame {
private JList<String> list;
private JTextArea area;
private DefaultListModel<String> lm;
public ServerForm() {
JPanel p = new JPanel(new BorderLayout());
// The rightmost user online list
lm = new DefaultListModel<String>();
list = new JList<String>(lm);
JScrollPane js = new JScrollPane(list);
Border border = new TitledBorder(" On-line ");
js.setBorder(border);
Dimension d = new Dimension(100, p.getHeight());
js.setPreferredSize(d);// Set location
p.add(js, BorderLayout.EAST);
// Notification text area
area = new JTextArea();
//area.setEnabled(false);// Cannot select and modify
area.setEditable(false);
p.add(new JScrollPane(area), BorderLayout.CENTER);
this.getContentPane().add(p);
// Add menu item
JMenuBar bar = new JMenuBar();// Menu bar
this.setJMenuBar(bar);
JMenu jm = new JMenu(" control (C)");
jm.setMnemonic('C');// Set mnemonics ---Alt+'C', Show it , But don't run
bar.add(jm);
final JMenuItem jmi1 = new JMenuItem(" Turn on ");
jmi1.setAccelerator(KeyStroke.getKeyStroke('R', KeyEvent.CTRL_MASK));// Set shortcut key Ctrl+'R'
jmi1.setActionCommand("run");
jm.add(jmi1);
JMenuItem jmi2 = new JMenuItem(" sign out ");
jmi2.setAccelerator(KeyStroke.getKeyStroke('E', KeyEvent.CTRL_MASK));// Set shortcut key Ctrl+'R'
jmi2.setActionCommand("exit");
jm.add(jmi2);
// monitor
ActionListener a1 = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("run")) {
startServer();
jmi1.setEnabled(false);// Internal methods ~ Access can only be final object
} else {
System.exit(0);
}
}
};
jmi1.addActionListener(a1);
Toolkit tk = Toolkit.getDefaultToolkit();
int width = (int) tk.getScreenSize().getWidth();
int height = (int) tk.getScreenSize().getHeight();
this.setBounds(width / 4, height / 4, width / 2, height / 2);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);// Turn off the function of the button
setVisible(true);
}
private static final int PORT = 9090;
protected void startServer() {
try {
ServerSocket server = new ServerSocket(PORT);
area.append(" Start the service ：" + server);
new ServerThread(server).start();
} catch (IOException e) {
e.printStackTrace();
}
}
// Used to save the names and of all online users Socket---- pool
private Map<String, Socket> usersMap = new HashMap<String, Socket>();
class ServerThread extends Thread {
private ServerSocket server;
public ServerThread(ServerSocket server) {
this.server = server;
}
@Override
public void run() {
try {// Shake hands with the client
while (true) {
Socket socketClient = server.accept();
Scanner sc = new Scanner(socketClient.getInputStream());
if (sc.hasNext()) {
String userName = sc.nextLine();
area.append("\r\n user [ " + userName + " ] Sign in " + socketClient);// Notify on the client side
lm.addElement(userName);// Add to user online list
new ClientThread(socketClient).start();// Specifically for this client
usersMap.put(userName, socketClient);// Add the currently logged in user to “ Online users ” In the pool
msgAll(userName);// hold “ The message that the current user logs in is the user name ” Notify all others who are already online
msgSelf(socketClient);// Notify the currently logged in user , Information about other people online
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
class ClientThread extends Thread {
private Socket socketClient;
public ClientThread(Socket socketClient) {
this.socketClient = socketClient;
}
@Override
public void run() {
System.out.println(" A thread that communicates with the client starts and starts communicating ...");
try {
Scanner sc = new Scanner(socketClient.getInputStream());
while (sc.hasNext()) {
String msg = sc.nextLine();
System.out.println(msg);
String msgs[] = msg.split("@#@#");
// Black proof
if(msgs.length!=4){
System.out.println(" The black ones ...");
continue;
}
if("on".equals(msgs[0])){
sendMsgToSb(msgs);
}
if("exit".equals(msgs[0])){
// The server shows
area.append("\r\n user [ " + msgs[3] + " ] Exited !" + usersMap.get(msgs[3]));
// Delete the user from the online user pool
usersMap.remove(msgs[3]);
// Delete the user from the online list of the server
lm.removeElement(msgs[3]);
// Notify other users , The user has exited
sendExitMsgToAll(msgs);
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
// Notify other users . The user has exited
private void sendExitMsgToAll(String[] msgs) throws IOException {
Iterator<String> userNames = usersMap.keySet().iterator();
while(userNames.hasNext()){
String userName = userNames.next();
Socket s = usersMap.get(userName);
PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
String str = "[email protected]#@#[email protected]#@# user [ "+msgs[3]+" ] Exited ！";
pw.println(str);
pw.flush();
str = "[email protected]#@#[email protected]#@#"+msgs[3];
pw.println(str);
pw.flush();
}
}
// The server forwards the chat message of the client to the corresponding other clients
public void sendMsgToSb(String[] msgs) throws IOException {
if(" All ".equals(msgs[1])){
Iterator<String> userNames = usersMap.keySet().iterator();
// Traverse every online user , Send him the chat message
while(userNames.hasNext()){
String userName = userNames.next();
Socket s = usersMap.get(userName);
PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
String str = "[email protected]#@#"+msgs[3]+"@#@#"+msgs[2];
pw.println(str);
pw.flush();
}
}else{
Socket s = usersMap.get(msgs[1]);
PrintWriter pw = new PrintWriter(s.getOutputStream(),true);
String str = "[email protected]#@#"+msgs[3]+" For you @#@#"+msgs[2];
pw.println(str);
pw.flush();
}
}
/**
* hold “ The message that the current user logs in is the user name ” Notify all others who are already online
*
* @param userName
*/
// Technical thinking : Take each in turn from the pool socket( On behalf of every online user ) Take out , Send it userName
public void msgAll(String userName) {
Iterator<Socket> it = usersMap.values().iterator();
while (it.hasNext()) {
Socket s = it.next();
try {
PrintWriter pw = new PrintWriter(s.getOutputStream(), true);// Add true For automatic refresh
String msg = "[email protected]#@#[email protected]#@# user [ " + userName + " ] Logged in !";// Notify the client to display a message
pw.println(msg);
pw.flush();
msg = "[email protected]#@#[email protected]#@#" + userName;// Notify the client to add users to the online list .
pw.println(msg);
pw.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* Notify the currently logged in user , Information about other people online
*
* @param socketClient
*/
// Send the names of those users who are already online to the login user , Let him give his interface lm Add the corresponding user name
public void msgSelf(Socket socketClient) {
try {
PrintWriter pw = new PrintWriter(socketClient.getOutputStream(),true);
Iterator<String> it = usersMap.keySet().iterator();
while (it.hasNext()) {
String msg = "[email protected]#@#[email protected]#@#" + it.next();
pw.println(msg);
pw.flush();
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);// Set decoration
new ServerForm();
}
}
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Client source code ：
package cn.hncu;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;
import javax.swing.DefaultListModel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
/**
* client
*
* @author Chen Haoxiang
* @version 1.0 2016-5-13
*/
public class ClientForm extends JFrame implements ActionListener {
private JTextField tfdUserName;
private JList<String> list;
private DefaultListModel<String> lm;
private JTextArea allMsg;
private JTextField tfdMsg;
private JButton btnCon;
private JButton btnExit;
private JButton btnSend;
// private static String HOST="192.168.31.168";
private static String HOST = "127.0.0.1";// Own machine , Server's ip Address
private static int PORT = 9090;// Port number of the server
private Socket clientSocket;
private PrintWriter pw;
public ClientForm() {
super(" Instant messaging tools 1.0");
// Menu bar
addJMenu();
// The upper panel
JPanel p = new JPanel();
JLabel jlb1 = new JLabel(" User ID :");
tfdUserName = new JTextField(10);
// tfdUserName.setEnabled(false);// Cannot select and modify
// dtfdUserName.setEditable(false);// Do not modify
// Link button
ImageIcon icon = new ImageIcon("a.png");
btnCon = new JButton("", icon);
btnCon.setActionCommand("c");
btnCon.addActionListener(this);
// Exit button
icon = new ImageIcon("b.jpg");
btnExit = new JButton("", icon);
btnExit.setActionCommand("exit");
btnExit.addActionListener(this);
btnExit.setEnabled(false);
p.add(jlb1);
p.add(tfdUserName);
p.add(btnCon);
p.add(btnExit);
getContentPane().add(p, BorderLayout.NORTH);
// The middle panel
JPanel cenP = new JPanel(new BorderLayout());
this.getContentPane().add(cenP, BorderLayout.CENTER);
// Online list
lm = new DefaultListModel<String>();
list = new JList<String>(lm);
lm.addElement(" All ");
list.setSelectedIndex(0);// Set the default display
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);// Only one row can be selected
list.setVisibleRowCount(2);
JScrollPane js = new JScrollPane(list);
Border border = new TitledBorder(" On-line ");
js.setBorder(border);
Dimension preferredSize = new Dimension(70, cenP.getHeight());
js.setPreferredSize(preferredSize);
cenP.add(js, BorderLayout.EAST);
// Chat message box
allMsg = new JTextArea();
allMsg.setEditable(false);
cenP.add(new JScrollPane(allMsg), BorderLayout.CENTER);
// Message sending panel
JPanel p3 = new JPanel();
JLabel jlb2 = new JLabel(" news :");
p3.add(jlb2);
tfdMsg = new JTextField(20);
p3.add(tfdMsg);
btnSend = new JButton(" send out ");
btnSend.setEnabled(false);
btnSend.setActionCommand("send");
btnSend.addActionListener(this);
p3.add(btnSend);
this.getContentPane().add(p3, BorderLayout.SOUTH);
// *************************************************
// In the top right corner of the X- close button - Add event handling
addWindowListener(new WindowAdapter() {
// Adapter
@Override
public void windowClosing(WindowEvent e) {
if (pw == null) {
System.exit(0);
}
String msg = "[email protected]#@# All @#@#[email protected]#@#" + tfdUserName.getText();
pw.println(msg);
pw.flush();
System.exit(0);
}
});
setBounds(300, 300, 400, 300);
setVisible(true);
}
private void addJMenu() {
JMenuBar menuBar = new JMenuBar();
this.setJMenuBar(menuBar);
JMenu menu = new JMenu(" Options ");
menuBar.add(menu);
JMenuItem menuItemSet = new JMenuItem(" Set up ");
JMenuItem menuItemHelp = new JMenuItem(" help ");
menu.add(menuItemSet);
menu.add(menuItemHelp);
menuItemSet.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
final JDialog dlg = new JDialog(ClientForm.this);// An interface pops up
// Can't be used directly this
dlg.setBounds(ClientForm.this.getX()+20, ClientForm.this.getY()+30,
350, 150);
dlg.setLayout(new FlowLayout());
dlg.add(new JLabel(" The server IP And port :"));
final JTextField tfdHost = new JTextField(10);
tfdHost.setText(ClientForm.HOST);
dlg.add(tfdHost);
dlg.add(new JLabel(":"));
final JTextField tfdPort = new JTextField(5);
tfdPort.setText(""+ClientForm.PORT);
dlg.add(tfdPort);
JButton btnSet = new JButton(" Set up ");
dlg.add(btnSet);
btnSet.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String ip = tfdHost.getText();// Analyze and judge ip Is it legal
String strs[] = ip.split("\\.");
if(strs==null||strs.length!=4){
JOptionPane.showMessageDialog(ClientForm.this, "IP Wrong type ！");
return ;
}
try {
for(int i=0;i<4;i++){
int num = Integer.parseInt(strs[i]);
if(num>255||num<0){
JOptionPane.showMessageDialog(ClientForm.this, "IP Wrong type ！");
return ;
}
}
} catch (NumberFormatException e2) {
JOptionPane.showMessageDialog(ClientForm.this, "IP Wrong type ！");
return ;
}
ClientForm.HOST=tfdHost.getText();// First analyze and judge ip Is it legal
try {
int port = Integer.parseInt( tfdPort.getText() );
if(port<0||port>65535){
JOptionPane.showMessageDialog(ClientForm.this, " Wrong port range ！");
return ;
}
} catch (NumberFormatException e1) {
JOptionPane.showMessageDialog(ClientForm.this, " Wrong port type ！");
return ;
}
ClientForm.PORT=Integer.parseInt( tfdPort.getText() );
dlg.dispose();// Close this interface
}
});
dlg.setVisible(true);// Show it
}
});
menuItemHelp.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JDialog dlg = new JDialog(ClientForm.this);
dlg.setBounds(ClientForm.this.getX()+30,ClientForm.this.getY()+30, 400, 100);
dlg.setLayout(new FlowLayout());
dlg.add(new JLabel(" Version all @ Chen Haoxiang .2016.5.16 My home page :http://chenhaoxiang.github.io"));
dlg.setVisible(true);
}
});
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("c")) {
if (tfdUserName.getText() == null
|| tfdUserName.getText().trim().length() == 0
|| "@#@#".equals(tfdUserName.getText())
|| "@#".equals(tfdUserName.getText())) {
JOptionPane.showMessageDialog(this, " User name input error , Please re-enter ！");
return;
}
connecting();// Action to connect to the server
if (pw == null) {
JOptionPane.showMessageDialog(this, " The server is not turned on or the network is not connected , Unable to connect ！");
return;
}
((JButton) (e.getSource())).setEnabled(false);
// get btnCon Button -- Get the source
// amount to btnCon.setEnabled(false);
btnExit.setEnabled(true);
btnSend.setEnabled(true);
tfdUserName.setEditable(false);
} else if (e.getActionCommand().equals("send")) {
if (tfdMsg.getText() == null
|| tfdMsg.getText().trim().length() == 0) {
return;
}
String msg = "[email protected]#@#" + list.getSelectedValue() + "@#@#"
+ tfdMsg.getText() + "@#@#" + tfdUserName.getText();
pw.println(msg);
pw.flush();
// Set the text of the sent message to null
tfdMsg.setText("");
} else if (e.getActionCommand().equals("exit")) {
// First clear your online menu
lm.removeAllElements();
sendExitMsg();
btnCon.setEnabled(true);
btnExit.setEnabled(false);
tfdUserName.setEditable(true);
}
}
// Send an exit message to the server
private void sendExitMsg() {
String msg = "[email protected]#@# All @#@#[email protected]#@#" + tfdUserName.getText();
System.out.println(" sign out :" + msg);
pw.println(msg);
pw.flush();
}
private void connecting() {
try {
// Take precautions according to the user name first
String userName = tfdUserName.getText();
if (userName == null || userName.trim().length() == 0) {
JOptionPane.showMessageDialog(this, " Failed to connect to server !\r\n Wrong user name , Please re-enter ！");
return;
}
clientSocket = new Socket(HOST, PORT);// Shake hands with the server
pw = new PrintWriter(clientSocket.getOutputStream(), true);// Plus auto refresh
pw.println(userName);// Report your user name to the server
this.setTitle(" user [ " + userName + " ] go online ...");
new ClientThread().start();// Accept messages from the server --- Always on
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
class ClientThread extends Thread {
@Override
public void run() {
try {
Scanner sc = new Scanner(clientSocket.getInputStream());
while (sc.hasNextLine()) {
String str = sc.nextLine();
String msgs[] = str.split("@#@#");
System.out.println(tfdUserName.getText() + ": " + str);
if ("msg".equals(msgs[0])) {
if ("server".equals(msgs[1])) {// The official message sent by the server
str = "[ notice ]:" + msgs[2];
} else {// Chat messages forwarded by the server
str = "[ " + msgs[1] + " ] say : " + msgs[2];
}
allMsg.append("\r\n" + str);
}
if ("cmdAdd".equals(msgs[0])) {
boolean eq = false;
for (int i = 0; i < lm.getSize(); i++) {
if (lm.getElementAt(i).equals(msgs[2])) {
eq = true;
}
}
if (!eq) {
lm.addElement(msgs[2]);// Users go online -- add to
}
}
if ("cmdRed".equals(msgs[0])) {
lm.removeElement(msgs[2]);// The user is offline -- remove
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);// Set decoration
new ClientForm();
}
}
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