Java编写的简单图书管理系统

Java编写的简单图书管理系统主界面代码实现package Library;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JPasswordField;import javax.swing.JTextField;public class Login extends JFrame {private static final long serialVersionUID= 1L;private JLabel jlUsername;private JLabel jlPwd;private JTextField txtUsername;//用户名private JTextField txtPassword;//密码private JButton jbOk;private JButton jbCancel;public JLabel getJlUsername(){if(jlUsername==null){jlUsername=new JLabel("账号");jlUsername.setForeground(Color.BLACK);jlUsername.setBounds(118, 40, 85, 30);}return jlUsername;}public JLabel getJlPwd(){if(jlPwd==null){jlPwd=new JLabel("密码");jlPwd.setForeground(Color.BLACK);jlPwd.setBounds(118, 100, 85, 30);}return jlPwd;}public JTextField getTxtUsername(){if(txtUsername==null){txtUsername=new JTextField(20);txtUsername.setBounds(180,40 , 200, 30);}return txtUsername;}public JTextField getTxtPassword(){if(txtPassword==null){txtPassword=new JPasswordField(20);txtPassword.setBounds(180, 100, 200, 30);}return txtPassword;}public JButton getJbOk(){if(jbOk==null){jbOk=new JButton("登陆");jbOk.setBounds(150, 180, 90, 30);//jbOk.addActionListener(this);}return jbOk;}public JButton getJbCancel(){if(jbCancel==null){jbCancel=new JButton("取消");jbCancel.setBounds(300, 180, 90, 30);}return jbCancel;}public Login(String title){super(title);//JFrame frame=new JFrame();Container cantainer=this.getContentPane();this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);ImageIcon img=new ImageIcon("F:\\Java\\传习\\src\\Library\\ZF`XY`H48I_}U)C4~}M2~C4.jpg");//这是背景图片JLabel imgLabel=new JLabel(img);//将背景图放在标签里。

this.getLayeredPane().add(imgLabel,new Integer(Integer.MIN_VALUE));//注意这里是关键，将背景标签添加到jfram的LayeredPane面板里。

imgLabel.setBounds(0,0,img.getIconWidth(),img.getIconHeight());//设置背景标签的位置cantainer.setLayout(new BorderLayout());imgLabel.setLayout(null);imgLabel.add(getJlUsername());imgLabel.add(getTxtUsername());imgLabel.add(getJlPwd());imgLabel.add(getTxtPassword());imgLabel.add(getJbOk());imgLabel.add(getJbCancel());cantainer.add(imgLabel,BorderLayout.NORTH);((JPanel)cantainer).setOpaque(false);//注意这里，将内容面板设为透明。

这样LayeredPane面板中的背景才能显示出来。

this.setSize(img.getIconWidth(),img.getIconHeight());myEvent();this.setVisible(true);this.setResizable(true);}private void myEvent(){jbCancel.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){Login.this.dispose();}});jbOk.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){Connection conn=null;Statement stm=null;ResultSet st=null;try{Class.forName("com.mysql.jdbc.Driver");conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/library","sa","12 3456");stm=conn.createStatement();String sql="select * from user";//String sql1="select psw from user";st=stm.executeQuery(sql);// st1=stm.executeQuery(sql1);if(st.next()){if(txtUsername.getText().equals(st.getString("id"))&&txtPassword.getText().equals(st .getString("psw"))){Login.this.setVisible(false);new Book("管理界面");}else{JOptionPane.showMessageDialog(null,"您输入的账号或密码不正确");getTxtUsername().setText("");getTxtPassword().setText("");}}else{JOptionPane.showMessageDialog(null,"用户名不存在,请重新输入,错误!");getTxtUsername().setText("");getTxtPassword().setText("");}}catch(ClassNotFoundException e1){e1.printStackTrace();}catch(SQLException e2){// TODO Auto-generated catch blocke2.printStackTrace();}finally{try{stm.close();}catch(Exception e3){}// 关闭Connectiontry{conn.close();}catch(Exception e4){}}}});}public static void main(String []args){new Login("图书管理登陆界面");}}管理界面实现代码package Library;import java.awt.BorderLayout; import java.awt.Container;import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.Connection;import java.sql.DriverManager; import java.sql.ResultSet;import java.sql.SQLException; import java.sql.Statement;。