addgradeinfo.java

针对数据库操作制作的一个学生管理系统

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

/**
 * 成绩信息管理模块
 * 添加新的成绩信息
 */
public class AddGradeInfo extends GradeInfo implements ActionListener{
	public AddGradeInfo() {
		this.setTitle("添加成绩信息");
		

		//设置运行位置，使对话框居中
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		this.setLocation( (int) (screenSize.width - 400) / 2 ,
						(int) (screenSize.height - 300) / 2 +45);
		
	}

	public void downInit(){
		addInfo.setText("增加");
		addInfo.setFont(new Font("Dialog",0,12));
		downPanel.add(addInfo);
		eixtInfo.setText("退出");
		eixtInfo.setFont(new Font("Dialog",0,12));
		downPanel.add(eixtInfo);

		this.contentPane.add(downPanel,BorderLayout.SOUTH);

		Sno.addActionListener(this);
		addInfo.addActionListener(this);
		eixtInfo.addActionListener(this);
	}

	/**
	 * 事件处理
	 */
	public void actionPerformed(ActionEvent e) {
		Object obj = e.getSource();
		
		if (obj == addInfo) { //增加
			Cno.setEnabled(false);
			Cname.setEditable(false);
			Ccredit.setEditable(false);
			Grade.setEditable(false);
			Sno.setEditable(false);
			Sname.setEditable(false);

			addInfo.setEnabled(false);
			clearInfo.setEnabled(false);
			eixtInfo.setEnabled(false);

			csBean addGrade = new csBean();
			addGrade.csModify(Cno.getText(),(String)Sno.getSelectedItem(),Grade.getText());

			this.dispose();
			AddGradeInfo agi = new AddGradeInfo();
			agi.downInit();
			agi.pack();
			agi.setVisible(true);
		}
		else if (obj == eixtInfo) { //退出
			this.dispose();
		}
		else if (obj == Sno) { //选择学号

			StuBean sN = new StuBean();
			Sname.setText(sN.stuSearch((String)Sno.getSelectedItem())[0]);
            
			if(Cname.getItemCount()>0){
				Cname.removeAllItems();
			}
			
			csBean cN = new csBean();
			cReturn = cN.cNameSearch((String)Sno.getSelectedItem());
			
			if(cReturn == null){
				Cname.removeActionListener(this);
				JOptionPane.showMessageDialog(null,"该学生没有选择课程！");
				addInfo.setEnabled(false);
				Cname.setEnabled(false);
			}
			else{
				int i = 0;

				for(i = 0; i < (cReturn.length); i++){
					Cname.addItem(cReturn[i]);
				}

				Cname.setEnabled(true);
				Sno.setEnabled(false);
				Cname.setSelectedItem(null);
				Cname.addActionListener(this);
			}
		}
		else if (obj == Cname) { //选择课程号
			CrsBean cSname = new CrsBean();
			Cno.setText(cSname.crsNameSearch((String)Cname.getSelectedItem(),(String)Sno.getSelectedItem())[0]);
			Ccredit.setText(cSname.crsNameSearch((String)Cname.getSelectedItem(),(String)Sno.getSelectedItem())[1]);
			addInfo.setEnabled(true);
			Cname.setEnabled(false);
			Cname.removeActionListener(this);
		}
	}
}