login.java

简单的考试系统,自动生成题目,用的电卡片布局管理

package gui01;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Login implements ActionListener{
	private JFrame frame;
	private Container contentPane;
	
	private JButton[] btnp0 = new JButton[4]; 
	private JTextField namep0;
	private JPasswordField pwp0;


	private JButton[] btnp1 = new JButton[3]; 
	private JTextField namep1;
	private JPasswordField pwp1;
	private JPasswordField pw2p1;
	
	private String strMsgp2;
	private int returnPanelp2;
	private JButton btnp2;
	
	public static Manage m;
	
 
	public Login(){
		m = Manage.getManage();
		frame = new JFrame("login");
		frame.setBounds(350,250,330,170);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setResizable(false);
		contentPane = frame.getContentPane();
		
		initGUI();
	}
	
	public void initGUI(){
		contentPane.setLayout(new CardLayout());
		selectPanel(0);
	}
	
	public void actionPerformed(ActionEvent e){
			if(e.getSource()==btnp0[0]){
				namep0.setText("");
				pwp0.setText("");	
				namep0.grabFocus();
			}
				
			if(e.getSource() ==btnp0[1]){
				selectPanel(1);
				
			}
					

			if (e.getSource()==btnp0[3]) 
				System.exit(0);
				
			if(e.getSource() == namep0){
				if(namep0.getText().trim().length()==0){
					frame.setTitle("Repeat input");
					namep0.grabFocus();

				}
				else
					pwp0.grabFocus();
			}
			
			if(e.getSource() == pwp0 || e.getSource()==btnp0[2]){
				//login

				if (namep0.getText().trim().length()==0){
					returnPanelp2 = 0;
					strMsgp2="user name is empty";	
					selectPanel(2);	
					return;
				}
				if (pwp0.getText().trim().length()==0){
					returnPanelp2 = 0;
					strMsgp2="password is empty";	
					selectPanel(2);
					return;	
				}
				String name = namep0.getText().trim();
				String pwd = pwp0.getText().trim();
				if (m.isFind(name,pwd)){
					frame.hide();
					m.setActiveUser(name);
					(new KaoShi()).go();
				}
				else{
					returnPanelp2 = 0;
					strMsgp2="name or pwd is not correct";	
					selectPanel(2);
					return;	
				}
			}
			if(e.getSource()==btnp1[0]){
			}
		
			if(e.getSource() ==btnp1[1]){
				selectPanel(0);
			}
					
				
			if(e.getSource() == namep1){
				if(namep1.getText().trim().length()==0){
					returnPanelp2 = 1;
					strMsgp2="user name is empty";	
					selectPanel(2);	

				}
				else
					pwp1.grabFocus();
			}	
				
			
			if(e.getSource() == btnp1[0] || e.getSource()==pw2p1){

				if (namep1.getText().trim().length()==0){
					returnPanelp2 = 1;
					strMsgp2="user name is empty";	
					selectPanel(2);	
					return;
				}
				if (pwp1.getText().trim().length()==0){
					returnPanelp2 = 1;
					strMsgp2="password is empty";	
					selectPanel(2);
					return;	
				}
				if (pw2p1.getText().trim().length()==0){
					returnPanelp2 = 1;
					strMsgp2="password2 is empty";	
					selectPanel(2);	
					return;
				}

				if (!pwp1.getText().trim().equals(pw2p1.getText().trim())){
					returnPanelp2 = 1;
					strMsgp2="password is not equal";	
					selectPanel(2);	
					return;
				}
				String name = namep1.getText().trim();
				String pwd = pwp1.getText().trim();
				boolean isadd = m.add(name,pwd);
				if (isadd){
					selectPanel(0);
				}
				else{
					returnPanelp2 = 1;
					strMsgp2="user:" + name + " is existed";	
					selectPanel(2);	
					return;
				}
			}
			
			if (e.getSource()==btnp2){
				selectPanel(returnPanelp2);
			}
	}
	public void selectPanel(int id){
		CardLayout c = (CardLayout)contentPane.getLayout();
		contentPane.add(getPanel(id),"");
		c.next(contentPane);
		System.out.println(contentPane.countComponents());
	}
	public JPanel getPanel(int id){
		JPanel pAll = null;
		JPanel p1,p2,p3,p4,p;
		switch(id){
			case 0:	
				pAll = new JPanel(new BorderLayout());
				namep0 = new JTextField(10);
		
				p1 = new JPanel(new FlowLayout());
				p1.add(new JLabel("User Name"));
				p1.add(namep0);

				pwp0 = new JPasswordField(10);
				p2 = new JPanel(new FlowLayout());
				p2.add(new JLabel("Password"));
				p2.add(pwp0);
		
				p = new JPanel(new GridLayout(2,1));
				p.add(p1);
				p.add(p2);
	
				pAll.add(p,BorderLayout.CENTER);
				btnp0[0] = new JButton("clear");
				btnp0[1] = new JButton("register");
				btnp0[2] = new JButton("ok");
				btnp0[3] = new JButton("quit");
				p3 = new JPanel(new FlowLayout());
	
		
				for (int i=0;i<4;i++)
					p3.add(btnp0[i]);
				pAll.add(p3,BorderLayout.SOUTH);
		
				for(int i=0;i<4;i++){
					btnp0[i].addActionListener(this);
				}
				namep0.addActionListener(this);
				pwp0.addActionListener(this);
				break;
			case 1:
				pAll = new JPanel(new BorderLayout());
				namep1 = new JTextField(10);
		
				p1 = new JPanel(new FlowLayout());
				p1.add(new JLabel("User Name"));
				p1.add(namep1);

				pwp1 = new JPasswordField(10);
				p2 = new JPanel(new FlowLayout());
				p2.add(new JLabel("Password"));
				p2.add(pwp1);
		
				pw2p1 = new JPasswordField(10);
				p3 = new JPanel(new FlowLayout());
				p3.add(new JLabel("Repeat pw"));
				p3.add(pw2p1);

				p = new JPanel(new GridLayout(3,1));
				p.add(p1);
				p.add(p2);
				p.add(p3);
	
				pAll.add(p,BorderLayout.CENTER);
				btnp1[0] = new JButton("register");
				btnp1[1] = new JButton("quit");
				
				p4 = new JPanel(new FlowLayout());
	
		
				for (int i=0;i<2;i++)
					p4.add(btnp1[i]);
				pAll.add(p4,BorderLayout.SOUTH);
		
			
				for(int i=0;i<2;i++){
					btnp1[i].addActionListener(this);
				}
				namep1.addActionListener(this);
				pwp1.addActionListener(this);
				pw2p1.addActionListener(this);
				break;
			case 2:
				pAll = new JPanel(new BorderLayout());
				pAll.add(new JLabel(strMsgp2),BorderLayout.CENTER);
				btnp2 = new JButton("back");				
				pAll.add(btnp2,BorderLayout.SOUTH);
				btnp2.addActionListener(this);
				break;

		}
		return pAll;
	}

	public void go(){
		frame.setVisible(true);
	
	}

	public static void main(String[] args){
		(new Login()).go();


	}
	
	
}