returnbookfrm.java

简易图书馆管理系统

import java.util.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.sql.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Date;
class Returnbookfrm extends JFrame implements ActionListener
{
	JLabel l_msg,l_user,l_bookname,l_data,l_beizhu;
	JTextField t_user,t_bookname,t_data,t_beizhu;
	JButton b_enter,b_clear,b_back;
	JPanel pan1,pan2,pan3,pan4,pan5,pan6;
	
	Date d;
	NetConn sql;
	Statement sqll;
	
	Returnbookfrm()
	{
		l_msg      =new JLabel("还书窗口    ");
		l_user     =new JLabel("还书者：");
		l_bookname =new JLabel("书  名：");
		l_data     =new JLabel("日  期：");
		l_beizhu   =new JLabel("备  注：");
		t_user     =new JTextField("",12);
		t_bookname =new JTextField("",12);
		t_data     =new JTextField("",12);
		d=new Date();
		t_data.setText(d.toLocaleString());
		t_beizhu   =new JTextField("",12);
		b_enter    =new JButton("确定");
		b_clear    =new JButton("清除");
		b_back     =new JButton("返回");
		b_enter.addActionListener(this);
		b_clear.addActionListener(this);
		b_back.addActionListener(this);
		pan1=new JPanel();pan2=new JPanel();pan3=new JPanel();pan4=new JPanel();pan5=new JPanel();pan6=new JPanel();
		pan1.add(l_msg);pan2.add(l_user);pan2.add(t_user);pan3.add(l_bookname);pan3.add(t_bookname);
		pan4.add(l_data);pan4.add(t_data);pan5.add(l_beizhu);pan5.add(t_beizhu);pan6.add(b_enter);pan6.add(b_clear);pan6.add(b_back);
		setLayout(new GridLayout(6,1));
		add(pan1);add(pan2);add(pan3);add(pan4);add(pan5);add(pan6);
		setBounds(400,100,400,500);
		
		sql=new NetConn();
	}
	public void actionPerformed(ActionEvent ed)
	{
		if(ed.getSource()==b_back)
		{
			if(ed.getSource()==b_back)
			{
				dispose();
			}
		}
		else if(ed.getSource()==b_clear)
		{
			t_user.setText("");t_beizhu.setText("");t_bookname.setText("");
		}
		else if(ed.getSource()==b_enter)
		{
			try
			{
				sqll=sql.connect();
				String a1="'"+t_data.getText()+"'";
				String a2="'"+t_beizhu.getText()+"'";
				String a3="'"+t_user.getText()+"'";
				String a4="'"+t_bookname.getText()+"'";
				String a5="'"+"y"+"'";
				String temp="update bookbrowse set returndata ="+a1+", isreturn ="+a5+", beizhu ="+a2+" where studentname ="+a3;
				sqll.executeUpdate(temp);
				l_msg.setText("还书成功");
			}
			catch(SQLException eg)
			{}
		}
	}
}