statisticdialog.java

学生管理系统

package stu;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.swing.JDialog;

public class StatisticDialog extends JDialog{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	int fifty = 0;

	int sixty = 0;

	int seventy = 0;

	int eighty = 0;

	int ninety = 0;

	float a1, a2, a3, a4, a5;

	public StatisticDialog(String str) {
		setModal(true);
		setAlwaysOnTop(true);
		try {
			
			ResultSet rs=null;
			rs=ServiceFactory.getService().executeQuery("select * from students");
			while (rs.next()) {
				String people = rs.getString(str).trim();
				if (Float.parseFloat(people) < 60.0)
					fifty = fifty + 1;
				else if (Float.parseFloat(people) < 70.0)
					sixty = sixty + 1;
				else if (Float.parseFloat(people) < 80.0)
					seventy = seventy + 1;
				else if (Float.parseFloat(people) < 90.0)
					eighty = eighty + 1;
				else if (Float.parseFloat(people) <= 100.0)
					ninety = ninety + 1;
			}
		} catch (SQLException e) {
			System.out.println("SQLException:" + e.getMessage());
		}
	}

	public void paint(Graphics g) {
		int all = fifty + sixty + seventy + eighty + ninety;

		a1 = fifty * 100 / all;
		a2 = sixty * 100 / all;
		a3 = seventy * 100 / all;
		a4 = eighty * 100 / all;
		a5 = ninety * 100 / all;
		fifty = fifty * 360 / all;
		sixty = sixty * 360 / all;
		seventy = seventy * 360 / all;
		eighty = eighty * 360 / all;
		ninety = ninety * 360 / all;
		int position = 360;
		Graphics2D g2D = (Graphics2D) g;
		g2D.setStroke(new BasicStroke(1.0f));

		Insets insets = getInsets();
		int L0 = (insets.left) / 2, T0 = (insets.top) / 2;
		g.setColor(Color.white);
		g.fillRect(L0, T0, 400, 300);

		g.setColor(Color.BLACK);
		g.drawString("优秀  （100-90）:" + a5 + "%", 20, 40);
		g.drawString("良好  （ 89-80）:" + a4 + "%", 20, 60);
		g.drawString("中等  （ 79-70）:" + a3 + "%", 20, 80);
		g.drawString("及格  （ 69-60）:" + a2 + "%", 20, 100);
		g.drawString("不及格（ 59- 0）:" + a1 + "%", 20, 120);

		g.setColor(Color.yellow);
		g.fillRect(150, 30, 60, 10);
		g.fillArc(150, 130, 150, 150, position, -ninety);
		position -= ninety;

		g.setColor(Color.GREEN);
		g.fillRect(150, 50, 60, 10);
		g.fillArc(150, 130, 150, 150, position, -eighty);
		position -= eighty;

		g.setColor(Color.pink);
		g.fillRect(150, 70, 60, 10);
		g.fillArc(150, 130, 150, 150, position, -seventy);
		position -= seventy;

		g.setColor(Color.CYAN);
		g.fillRect(150, 90, 60, 10);
		g.fillArc(150, 130, 150, 150, position, -sixty);
		position -= sixty;

		g.setColor(Color.red);
		g.fillRect(150, 110, 60, 10);
		g.fillArc(150, 130, 150, 150, position, -fifty);
		position -= fifty;

	}

}