returnbook.java

网上图书管理系统(java)用Web方法开发的管理系统挂接在电子系网站上

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class ReturnBook extends JFrame implements ActionListener
{
	DataBaseManager db=new DataBaseManager();
	ResultSet rs;
	JPanel panel1,panel2;
	Container c;
	JLabel ReturnedBookStudentLabel,ReturnedBookNameLabel,
	       ReturnedDateLabel,ReturnedCommentLabel;
	JTextField ReturnedBookStudentTextField,
	           ReturnedDateTextField,ReturnedCommentTextField;
	JButton ClearBtn,YesBtn,CancelBtn;
	JComboBox BookNameComboBox=new JComboBox();
	public ReturnBook()
	{
		super("书籍还入");
		c=getContentPane();
		c.setLayout(new BorderLayout());
		ReturnedBookStudentLabel=new JLabel("还书者姓名",JLabel.CENTER);
		ReturnedBookNameLabel=new JLabel("书名",JLabel.CENTER);
		ReturnedDateLabel=new JLabel("日期",JLabel.CENTER);
		ReturnedCommentLabel=new JLabel("备注",JLabel.CENTER);
		ReturnedBookStudentTextField=new JTextField(15);
		ReturnedDateTextField=new JTextField(15);
		ReturnedCommentTextField=new JTextField(15);
		try
		{
			String s="";
			String strSQL="select bookName from bookBrowse where is_returned='否'"; 
			rs=db.getResult(strSQL);
			while(rs.next())
			{
				BookNameComboBox.addItem(rs.getString(1));
			}
		}
		catch(SQLException sqle)
		{
			System.out.println(sqle.toString());
		}
		catch(Exception ex)
		{
			System.out.println(ex.toString());
		}
		panel1=new JPanel();
		panel1.setLayout(new GridLayout(4,2));
		panel1.add(ReturnedBookStudentLabel);
		panel1.add(ReturnedBookStudentTextField);
		panel1.add(ReturnedBookNameLabel);
		panel1.add(BookNameComboBox);
		panel1.add(ReturnedDateLabel);
		panel1.add(ReturnedDateTextField);
		panel1.add(ReturnedCommentLabel);
		panel1.add(ReturnedCommentTextField);
		c.add(panel1,BorderLayout.CENTER);
		panel2=new JPanel();
		panel2.setLayout(new GridLayout(1,3));
		ClearBtn=new JButton("清空");
		YesBtn=new JButton("确定");
		CancelBtn=new JButton("取消");
		ClearBtn.addActionListener(this);
		YesBtn.addActionListener(this);
		CancelBtn.addActionListener(this);
		panel2.add(ClearBtn);
		panel2.add(YesBtn);
		panel2.add(CancelBtn);
		c.add(panel2,BorderLayout.SOUTH);
	}
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==CancelBtn)
		{
			this.dispose();
		}
		else if(e.getSource()==ClearBtn)
		{
			ReturnedBookStudentTextField.setText("");
		        ReturnedDateTextField.setText("");
		        ReturnedCommentTextField.setText("");
		
		}
		else if(e.getSource()==YesBtn)
		{
			if(ReturnedBookStudentTextField.getText().trim().equals(""))
			{
				JOptionPane.showMessageDialog(null,"请输入还书者的姓名。。。");
			}
			else if(BookNameComboBox.getSelectedItem().equals(""))
			{
				JOptionPane.showMessageDialog(null,"图书馆没有出借过书！");
			}
			else
			{
				try
				{
				String strSQL="update bookBrowse set returnDate=TO_DATE('"+
				ReturnedDateTextField.getText().trim()+"'),com='"+
				ReturnedCommentTextField.getText().trim()+"',is_returned='是' where studentName='"+
				ReturnedBookStudentTextField.getText().trim()+"'and bookName='"+
				BookNameComboBox.getSelectedItem()+"'";
				if(db.updateSql(strSQL))
				{
					JOptionPane.showMessageDialog(null,"还书完成！");
					strSQL="update books set borrowed_count=borrowed_count-1 where bookname='"+
					BookNameComboBox.getSelectedItem()+"'";
					db.updateSql(strSQL);
					db.closeConnection();
					this.dispose();
				}
				else
				{
					JOptionPane.showMessageDialog(null,"还书失败！");
					db.closeConnection();
					this.dispose();
				}
			}
		catch(Exception ex)
		{
			System.out.println(ex.toString());
		}
			}
		}
	}
}