main.java

一阶微分算法

//Main.java
package chatserver;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollpane;
import javax.swing.JTextArea;
import javax.swing.JToolBar;
import javax.swing.KeyStroke;
public class Main extends JFrame implements ChatServerListener{
ChatServerImpl server=ChatServerImpl.getInstance();
JTextArea textArea;
JMenuBar mentBar;
JToolBar toolBar;
StarServerAction startAction=new StarServerAction();
StopServerAction stopAction=new StopServerAction();
public static void main(String[] args){
Main main=new Main();
main.show();
}  
public Main(){
super("聊天——服务器");
setSize(300,500);
layoutComponents();
}
private void layoutComponents(){
setupMenu();
setupToolBar();
textArea=new JTextArea();
textArea.setSize(200,300);
textArea.setEditable(false);
JScrollPane scrollPane=new JScrollPane(textArea);
getContentPane().add(scrollPane,BorderLayout.CENTER);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
private void setupMenu(){
menuBar=new JMenuBar();
JMenuItem startServer=new JMenuItem(startAction);
JMenuItem stopServer=new JMenuItem(stopAction);
JMenuItem exit=new JMenuItem("离开");
exit.addActionListener(new AbstractAction(){
public void actionPerformed(ActionEvent evt){
exit();
}
});
JMenu server=new JMenu("服务器");
server.add(startServer);
server.add(stopServer);
server.add(exit);
menuBar.add(server);
setJMenuBar(menuBar);
}
privarte void setupToolBar(){
toolBar=new JToolBar();
JButton button=null;
addTool(toolBar,startAction);
addTool(toolBar,stopAction);
getContentPane().add(toolBar,BorderLayout.NORTH);
}
JButton addTool(
JToolBar toolBar,
AbstractAction action){
b.setAction(action);
b.setText(null);
toolBar.add(b);
return b;
}
private void exit(){
try{
server.stop();
}
catch(Exception e){
e.printStackTrace();
}
System.exit(0);
}
public void serverEvent(ChatServerEvent evt){
textArea.append(evt.getMessage()+"\n");
}
class StarServerAction extends AbstractAction{
public StarServerAction(){
super("启动");
putValue(
Action.SMALL_ICON,
new ImageIcon(getClass(),getResource("images/start.gif")));
putValue(Action.SHORT_DESCRIPTION,"启动聊天服务器");
putValue(
Action.ACCELERATOR_KEY,
KeyStroke.getKeyStroke("control A"));

}
public void actionPerformed(ActionEvent evt){
try{
server.addListener(Main.this);
textArea.setText("");
server.start();
stopAction.setEnabled(true);
this.setEnabled(false);
}
catch (Exception ex){
textArea.append("服务器启动错误\n");
server.removeListener(Main.this);
ex.printStackTrace();
return;
}
}

}
class StopServerAction extends AbstractAction{
public StopServerAction(){
super("停止");
putValue(
Action.SMALL_ICON,
new ImageIcon(getClass().getResource("images/stop.gif")));
putValue(Action.SHORT_DESCRIPTION,"停止聊天服务器");
putValue(
Action.ACCELERATOR_KEY,
KeyStroke.getKeyStroke("control O");
this.setEnabled(false);
)
public void actionPerformed(ActionEvent arg0){
try{
server.stop();
server.removeListener(Main.this);
startAction.setEnabled(true);
this.setEnabled(false);
}
catch(Exception e){
textArea.append("服务器停止错误\n");
e.printStackTrace();
return;
}
}

}
}
}