choicestudent.java

自己用java编写的基于B/S的在线考试系统

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Window;
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.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;

public class ChoiceStudent extends JDialog implements ActionListener {
	JTextField id;

	JLabel lable, lable1;

	JButton yes, no,queryID;

	JPanel p1, p2, p3,p4;

	String message;
	
	JTable table;
	Object[][] a = new Object[2][5];
	Object name[] = { "学号", "姓名", "性别", "得分", "参加考试时间" };
	ChoiceStudent(JFrame f, String s, boolean b) {
		super(f, s, b);
		setLayout(new FlowLayout());
		p1 = new JPanel();
		p2 = new JPanel();
		p3 = new JPanel();
		p4 = new JPanel();
		id = new JTextField(10);
		lable1 = new JLabel("学号:");
		yes = new JButton("查询全部");
		queryID = new JButton("ID查询");
		no = new JButton("取消");
		yes.addActionListener(this);
		no.addActionListener(this);
		queryID.addActionListener(this);
		table = new JTable(a, name);
		table.setDragEnabled(true);
		table.setEnabled(false);
		p2.add(lable1);
		p2.add(id);
		p2.add(queryID);
		p3.add(yes);
		p3.add(no);
		p4.add(new JScrollPane(table), BorderLayout.CENTER);
		add(p1);
		add(p2);
		add(p3);
		add(p4);
		setSize(496, 510);
		setResizable(true);
		setLocation(250, 180);
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				Window w = e.getWindow();
				w.setVisible(false);
				w.dispose();
			}
		});
		this.setVisible(true);
		validate();
	}
	public void cleanColm(){
		this.getContentPane().remove(3);
		table = new JTable(a, name);
		this.repaint();
		table.setBackground(Color.BLACK);
		table.setForeground(Color.GREEN);
		add(new JScrollPane(table), BorderLayout.CENTER);
		this.repaint();
		validate();
	}
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == yes) {
			boolean flag = true;
			if(flag){
				List<Student> students = new ArrayList<Student>();
				students = new StudentManager().queryStudentByAll();
				int tmp = students.size();
				a = new Object[tmp][5];
				for (int i = 0; i < students.size(); i++) {
					Student st = students.get(i);
					a[i][0] = st.getId();
					a[i][1] = st.getName();
					a[i][2] = st.getSex();
					a[i][3] = st.getScore();
					if(st.getJointime()==null){
						a[i][4] = "未参加考试";
					}else{
						a[i][4] = st.getJointime().toString();
					}
				}
				this.getContentPane().remove(3);
				table = new JTable(a, name);
				this.repaint();
				table.setBackground(Color.BLACK);
				table.setForeground(Color.GREEN);
				add(new JScrollPane(table), BorderLayout.CENTER);
				this.repaint();
				validate();
			}else{
				JOptionPane.showMessageDialog(this, "ID是无效字符！！", "消息",JOptionPane.WARNING_MESSAGE);
				id.setText(null);
			}
		}
		if(e.getSource()==queryID){
			boolean flag = false;
			String messageTmp = id.getText();
			char[] atmp = messageTmp.toCharArray();
			for (int i = 0; i < atmp.length; i++) {
				if ('1' <= atmp[i] && atmp[i] <= '9') {
					flag = true;
				}
			}
			if(!flag){
				JOptionPane.showMessageDialog(this, "ID是无效字符！！", "消息",JOptionPane.WARNING_MESSAGE);
				this.id.setText(null);
				return;
			}
			int id = Integer.parseInt(messageTmp);
			this.repaint();
			StudentManager stm = new StudentManager();
			Student student = new Student();
			student = stm.queryStudent(id);
			cleanColm();
			if(student!=null){
				a[0][0] = student.getId();
				a[0][1] = student.getName();
				a[0][2] = student.getSex();
				a[0][3] = student.getScore();
				this.getContentPane().remove(3);
				table = new JTable(a, name);
				this.repaint();
				table.setBackground(Color.BLACK);
				table.setForeground(Color.GREEN);
				add(new JScrollPane(table), BorderLayout.CENTER);
				this.repaint();
				validate();
			}else{
				JOptionPane.showMessageDialog(this, "没有相关学生信息！！", "消息",JOptionPane.WARNING_MESSAGE);
				this.id.setText(null);
			}
			
		}
		if (e.getSource() == no) {
			this.setVisible(false);
			this.dispose();
		}
	}
}