用户登录界面代码

《用户登录界面代码》由会员分享，可在线阅读，更多相关《用户登录界面代码（9页珍藏版）》请在装配图网上搜索。

1、系统入口类中这样：LoginFrame lf=new LoginFrame();If.setVisible(true);LoginFrame中，按钮“OK”的监听事件这样:连接数据库，并验证用户名和密码if(success)/验证成功MainFrame mf=new MainFrame();mf.setVisible(true);dispose(); 销毁 LoginFrameelse提示错误信息2import javax.swing.*;import java.awt.*;import java.awt.event.*;/下面代码创建JFrame框架窗体class FrameTest ext

2、ends JFrame(public FrameTest()(super(客 户登录);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setVisible(true);setSize(406,195);/下面代码创建JPanel面板，并将面板添加到框架窗体class PanelTest extends FrameTest(JPanel panelObj;public PanelTest()(panelObj二new JPanel();getContentPane().add(panelObj);/下面代码创建javax.swing控件，并将控件添

3、加到面板 class ComponentTest extends PanelTest构造组件类(JLabel labelName;姓名JLabel labelMima;密码JTextField textName;/文本框JTextField textMima;/文本框JButton buttonObj1;确定按钮JButton buttonObj2;/重置按钮public ComponentTest()(labelName =new JLabel(姓名”)；labelMima =new JLabel(密码”)；textName =new JTextField(25);textMima =new

4、 JTextField(15);buttonObjl=new JButton( 确定)；buttonObj2=new JButton(重置”)；buttonObjl.setEnabled(true); 使能buttonObj2.setEnabled(false); /不使能panelObj.add(labelName);panelObj.add(textName);panelObj.add(labelMima);panelObj.add(textMima);panelObj.add(buttonObjl);panelObj.add(buttonObj2);/下面代码创建GridBagLayou

5、t布局管理器，并将布局应用到面板 class LayoutManagerTest extends ComponentTest 构造布局类 (GridBagLayout gbLayoutObj;GridBagConstraints gbcObj;public LayoutManagerTest()(gbLayoutObj二new GridBagLayout();gbcObj=new GridBagConstraints();panelObj.setLayout(gbLayoutObj);gbcObj.anchor=GridBagConstraints.EAST;gbcObj.gridx=1;gb

6、cObj.gridy=1;gbLayoutObj.setConstraints(labelName,gbcObj);gbcObj.gridy=2;gbLayoutObj.setConstraints(labelMima,gbcObj);gbcObj.gridy=3;gbLayoutObj.setConstraints(buttonObj1,gbcObj);gbcObj.anchor=GridBagConstraints.WEST;gbcObj.gridx=2;gbcObj.gridy=1;gbLayoutObj.setConstraints(textName,gbcObj);gbcObj.gr

7、idy=2;gbLayoutObj.setConstraints(textMima,gbcObj);gbcObj.gridy=3;gbLayoutObj.setConstraints(buttonObj2,gbcObj);class EventTest extends LayoutManagerTest(ButtonEvent bEObj;public EventTest()(bEObj=new ButtonEvent();创建事件类对象buttonObj1.addActionListener(bEObj); 注册监听器buttonObj2.addActionListener(bEObj);

8、注册监听器class ButtonEvent implements ActionListener(public void actionPerformed(ActionEvent e)(Object obj=e.getSource();Object options=确定，取消;if(obj=buttonObj1)(String strObj1=textName.getText();String strObj2=textMima.getText();String str1=new String(警告！姓名不能为空.)；String str2=new String(警告！密码不能为空.)；/if(s

9、trObj1.length()=O|strObj2.length()=O)/ (if(strObj1.length()=O)( /String str1=new String(警告！姓名不能为空.)；JOptionPane.showOptionDialog(null,str1,警告窗口！ .JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,null,options,o ptions0);return;else(if(strObj2.length()=O)( / String str2=new String(警告！密码不能为空.)；JO

10、ptionPane.showOptionDialog(null,str2，警告窗 口！, JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,null,options,o ptions0);return;/ else(String str3二new String(文本框内容是：n 姓名：+strObj1+n 密码”+strObj2);JOptionPane.showOptionDialog(null,str3,确定窗口！， JOptionPane.DEFAULT_OPTION,JOptionPane.INFORMATION_MESSAG

11、E,null,optio ns,options0);buttonObj1.setEnabled(false);buttonObj2.setEnabled(true);if(obj=buttonObj2)(buttonObj2.setEnabled(false);buttonObj1.setEnabled(true);textName.setText();textMima.setText();String str1=new String(你单击了重置(E) ，清空文本框。)； JOptionPane.showOptionDialog(null,str1,信息窗口！， JOptionPane.DE

12、FAULT_OPTION,JOptionPane.INFORMATION_MESSAGE,null,optio ns,options0);下面代码是包含main()函数的公共类public class yonghudenglu extends EventTest ( public static void main(String args) (new yonghudenglu(); import java.awt.*;import javax.swing.*;public class guanli_chaozuo extends JFrame(publicJLabel jusername;pub

13、licJLabel jpassword,jpassword_sure;publicJTextField username;public JPasswordField password,password_sure;publicJButton jb1,jb2;public voidmake_GUI()(jusername=new JLabel (用户名* );jpassword=new JLabel (新密码* );jpassword_sure=new JLabel (新密码确认*);jb1=new JButton( 确定)；jb2=new JButton( 取消)；username=new JT

14、extField(10);password=new JPasswordField(10);password_sure=new JPasswordField(10);Container cp=getContentPane();JPanel jp=new JPanel();JPanel jp2 =new JPanel();jp.setLayout(new GridLayout(4,8,20,10);jp.add(jusername);jp.add(username);jp.add(jpassword);jp.add(password);jp.add(jpassword_sure);jp.add(p

15、assword_sure);jp2.add(jb1);jp2.add(jb2);cp.add(jp,BorderLayout.CENTER);cp.add(jp2,BorderLayout.SOUTH);setSize(300,200);setVisible(true);public guanli_chaozuo(String s)(super(s);make_GUI();public void exit()( this.dispose();4import javax.swing.*;import java.awt.*;public class FlowLayoutDemo extends J

16、Frame(public FlowLayoutDemo()(setLayout(new BorderLayout(5,5);setFont(new Font(Helvetica，Font.PLAIN,14);JLabel jlab1,jlab2,jlab3;jlab1=new JLabel(欢迎使用考试系统);jlab2=new JLabel(用户名：)；jlab3=new JLabel(密码：)；jlab1.setFont(new Font(隶书 ，Font.BOLD,24);JButton B1=new JButton();JButton B2=new JButton();JButton

17、B3=new JButton();JTextField username=new JTextField(15);JPasswordField password=new JPasswordField (15);B1=new JButton(登陆”)；B2=new JButton( 注册”)；B3=new JButton(取消”)；JPanel p1=new JPanel();JPanel p2=new JPanel();JPanel p3=new JPanel();p1.add(jlab2);p1.add(jlab3);p2.add(username);p2.add(password);p3.a

18、dd(B1);p3.add(B2);p3.add(B3);password.setEchoChar(*);JTextField flab2;JTextField flab3;add(North, jlab1);add(West,p1);add(Center,p2);add(South,p3);public static void main(String args) (FlowLayoutDemo window=new FlowLayoutDemo();window.setTitle( 用户登陆)；window.setSize(300,200);window.setLocationRelativeTo(null);window.setResizable(false);window.setVisible(true);window.setDefaultCloseOperation(EXIT_ON_CLOSE);