loginframe.java

这是个可以进行多项选择的系统

package exam.gui;

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import exam.model.Course;
import exam.model.Student;
import exam.web.ExamClient;

/**
 * 登录界面
 * @author 董晓炜
 *
 */
public class LoginFrame extends JFrame{
	private static final long serialVersionUID = 2272140086458982067L;
	private JFrame jf;
	private JTextField jtf;
	private JPasswordField jpf;
	private JButton jb1,jb2;
	private ExamClient ec;
	private Student sd;
	
	public JTextField getJtf() {
		return jtf;
	}
	public void setJtf(JTextField jtf) {
		this.jtf = jtf;
	}
	public JPasswordField getJpf() {
		return jpf;
	}
	public void setJpf(JPasswordField jpf) {
		this.jpf = jpf;
	}
	public LoginFrame(ExamClient ec){
		this.ec=ec;
		jf=new JFrame("考生登录");
		jtf=new JTextField(10);
		jpf=new JPasswordField(10);
		jb1=new JButton("登录");
		jb2=new JButton("取消");
		init();
		addEventHandler();
		showMe();
	}
	private void addEventHandler(){
		jb1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				sd=ec.login(jtf,jpf);
				if(sd==null){
					JOptionPane.showMessageDialog(jf,"该用户不存在"); 
					
				}
				else if(sd.getId().equals("1001")){
					JOptionPane.showMessageDialog(jf, "你已考过一次了");
					return;
				}else if(sd.getId().equals("1002")){
					JOptionPane.showMessageDialog(jf, "服务器暂停中。。。");
				}else{
					Course[] courses=ec.getCourses();
					if(courses==null){JOptionPane.showMessageDialog(jf, "服务器暂停中。。。");return;}
					jf.setVisible(false);
					new SelectSubjectFrame(ec,courses);
				}
				
			}
			
		});
		jb2.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				ec.close();
				System.exit(0);
			}	
		});
		jf.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent arg0) {
				ec.close();
				System.exit(0);
			}
			
		});
	}
	private void init(){
		JPanel center=new JPanel();
		JLabel jl=new JLabel("考生登录");
		jl.setHorizontalAlignment(JLabel.CENTER);
		center.setLayout(new GridBagLayout());
		
		GridBagConstraints gbc1=new GridBagConstraints();
		gbc1.gridx=0;
		gbc1.gridy=0;
		center.add(new JLabel("学号"),gbc1);
		
		GridBagConstraints gbc2=new GridBagConstraints();
		gbc2.gridx=0;
		gbc2.gridy=1;
		center.add(new JLabel("密码"),gbc2);
		
		GridBagConstraints gbc3=new GridBagConstraints();
		gbc3.gridx=1;
		gbc3.gridy=0;
		center.add(jtf,gbc3);
		
		GridBagConstraints gbc4=new GridBagConstraints();
		gbc4.gridx=1;
		gbc4.gridy=1;
		center.add(jpf,gbc4);
		
		
		JPanel south=new JPanel();
		south.add(jb1);
		south.add(jb2);
		
		jf.add(jl,BorderLayout.NORTH);
		jf.add(center,BorderLayout.CENTER);
		jf.add(south,BorderLayout.SOUTH);
	}
	
	private void showMe(){
		jf.pack();
		jf.setLocation(200, 200);
		jf.setResizable(false);
		jf.setVisible(true);
		jf.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
	}

	
}