登陆界面的java代码怎么写？

Python021

登陆界面的java代码怎么写？,第1张

import java.awt.*\x0d\x0aimport javax.swing.*\x0d\x0aimport java.awt.event.*\x0d\x0aimport java.sql.*\x0d\x0a\x0d\x0aclass LoginFrm extends JFrame implements ActionListener \x0d\x0a{ \x0d\x0aJLabel lbl1=new JLabel("用户名")\x0d\x0aJLabel lbl2=new JLabel("密码")\x0d\x0aJTextField txt=new JTextField(15)\x0d\x0aJPasswordField pf=new JPasswordField()\x0d\x0aJButton btn1=new JButton("确定")\x0d\x0aJButton btn2=new JButton("取消")\x0d\x0a\x0d\x0apublic LoginFrm() \x0d\x0a{ \x0d\x0athis.setTitle("登陆")\x0d\x0aJPanel jp=(JPanel)this.getContentPane()\x0d\x0ajp.setLayout(new GridLayout(3,2,10,10))\x0d\x0ajp.add(lbl1)jp.add(txt)\x0d\x0ajp.add(lbl2)jp.add(pf)\x0d\x0ajp.add(btn1)jp.add(btn2)\x0d\x0abtn1.addActionListener(this)\x0d\x0abtn2.addActionListener(this)\x0d\x0a} \x0d\x0a\x0d\x0apublic void actionPerformed(ActionEvent ae) \x0d\x0a{ \x0d\x0aif(ae.getSource()==btn1) \x0d\x0a{ \x0d\x0atry \x0d\x0a{ \x0d\x0aClass.forName("sun.jdbc.odbc.JdbcOdbcDriver")； \x0d\x0aConnection con=DriverManager.getConnection("jdbc:odbc:MyDB","","")\x0d\x0aStatement cmd=con.createStatement()\x0d\x0aResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"+txt.getText()+"' and password='"+pf.getText()+"'")\x0d\x0aif(rs.next()) \x0d\x0a{ \x0d\x0aJOptionPane.showMessageDialog(null,"登陆成功！")\x0d\x0a} \x0d\x0aelse \x0d\x0aJOptionPane.showMessageDialog(null,"用户名或密码错误！")\x0d\x0a} catch(Exception ex){} \x0d\x0a\x0d\x0aif(ae.getSource()==btn2) \x0d\x0a{ \x0d\x0atxt.setText("")\x0d\x0apf.setText("")\x0d\x0a} \x0d\x0a} \x0d\x0a} \x0d\x0a\x0d\x0apublic static void main(String arg[]) \x0d\x0a{ \x0d\x0aJFrame.setDefaultLookAndFeelDecorated(true)\x0d\x0aLoginFrm frm=new LoginFrm()\x0d\x0afrm.setSize(400,200)\x0d\x0afrm.setVisible(true)\x0d\x0a} \x0d\x0a}

CS结构系统的退出如下：public void init() {\x0d\x0a this.setTitle("用户登录界面")\x0d\x0a this.add(createCenterPane())\x0d\x0a this.setDefaultCloseOperation(this.DO_NOTHING_ON_CLOSE)\x0d\x0a this.setSize(new Dimension(450, 335))\x0d\x0a this.setLocationRelativeTo(null)\x0d\x0a // this.setVisible(true)\x0d\x0a this.addWindowListener(new WindowAdapter() {\x0d\x0a public void windowClosing(WindowEvent e) {\x0d\x0aint choose = JOptionPane.showConfirmDialog(null, "是否要退出登录界面？",\x0d\x0a "系统提示：", JOptionPane.YES_NO_OPTION)\x0d\x0aif (choose == JOptionPane.YES_OPTION) {\x0d\x0a System.exit(1)\x0d\x0a}\x0d\x0a }\x0d\x0a })\x0d\x0a }其中this为JFrame对象。BS结构的退出直接用windows.close()方法就行了！