请教,做一个简单的登陆界面

发布网友发布时间：2022-05-26 20:32

共1个回答

热心网友时间：2023-10-26 19:40

import javax.swing.JFrame;//框架import javax.swing.JPanel;//面板import javax.swing.JButton;//按钮import javax.swing.JLabel;//标签import javax.swing.JTextField;//文本框import java.awt.Font;//字体import java.awt.Color;//颜色import javax.swing.JPasswordField;//密码框import java.awt.event.ActionListener;//事件监听import java.awt.event.ActionEvent;//事件处理import javax.swing.JOptionPane;//消息窗口public class UserLogIn extends JFrame{ public JPanel pnluser; public JLabel lbluserLogIn; public JLabel lbluserName; public JLabel lbluserPWD; public JTextField txtName; public JPasswordField pwdPwd; public JButton btnSub; public JButton btnReset; public UserLogIn(){ pnluser = new JPanel(); lbluserLogIn = new JLabel(); lbluserName = new JLabel(); lbluserPWD = new JLabel(); txtName = new JTextField(); pwdPwd = new JPasswordField(); btnSub = new JButton(); btnReset = new JButton(); userInit(); } public void userInit(){ this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭框架的同时结束程序 this.setSize(300,200);//设置框架大小为长300,宽200 this.setResizable(false);//设置框架不可以改变大小 this.setTitle("用户登录");//设置框架标题 this.pnluser.setLayout(null);//设置面板布局管理 this.pnluser.setBackground(Color.cyan);//设置面板背景颜色 this.lbluserLogIn.setText("用户登录");//设置标签标题 this.lbluserLogIn.setFont(new Font("宋体",Font.BOLD Font.ITALIC,14));//设置标签字体 this.lbluserLogIn.setForeground(Color.RED);//设置标签字体颜色 this.lbluserName.setText("用户名:"); this.lbluserPWD.setText("密码:"); this.btnSub.setText("登录"); this.btnReset.setText("重置"); this.lbluserLogIn.setBounds(120,15,60,20);//设置标签x坐标120,y坐标15,长60,宽20 this.lbluserName.setBounds(50,55,60,20); this.lbluserPWD.setBounds(50,85,60,25); this.txtName.setBounds(110,55,120,20); this.pwdPwd.setBounds(110,85,120,20); this.btnSub.setBounds(85,120,60,20); this.btnSub.addActionListener(new ActionListener()//匿名类实现ActionListener接口 { public void actionPerformed(ActionEvent e){ btnsub_ActionEvent(e); } } ); this.btnReset.setBounds(155,120,60,20); this.btnReset.addActionListener(new ActionListener()//匿名类实现ActionListener接口 { public void actionPerformed(ActionEvent e){ btnreset_ActionEvent(e); } } ); this.pnluser.add(lbluserLogIn);//加载标签到面板 this.pnluser.add(lbluserName); this.pnluser.add(lbluserPWD); this.pnluser.add(txtName); this.pnluser.add(pwdPwd); this.pnluser.add(btnSub); this.pnluser.add(btnReset); this.add(pnluser);//加载面板到框架 this.setVisible(true);//设置框架可显 } public void btnsub_ActionEvent(ActionEvent e){ String name = txtName.getText(); String pwd = String.valueOf(pwdPwd.getPassword()); if(name.equals("")){ JOptionPane.showMessageDialog(null,"账号不能为空","错误",JOptionPane.ERROR_MESSAGE); return; }else if (pwd.equals("")){ JOptionPane.showMessageDialog(null,"密码不能为空","错误",JOptionPane.ERROR_MESSAGE); return; }else if(true){ this.dispose(); }else{ JOptionPane.showMessageDialog(null,"账号或密码错误","错误",JOptionPane.ERROR_MESSAGE); return; } } public void btnreset_ActionEvent(ActionEvent e){ txtName.setText(""); pwdPwd.setText(""); } public static void main(String[] args){ new UserLogIn(); }}