java 学习笔记--------改进后的登录界面

一时失言乱红尘 2022-08-03 08:37 148阅读 0赞

package com.package\_view;  
  
  
import com.package\_model.\*;  
  
  
import javax.swing.\*;  
  
  
import java.awt.\*;  
import java.io.\*;  
import java.awt.image.\*;  
import javax.imageio.\*;  
  
  
import java.awt.event.\*;  
/\*  
\* 1.界面布局的设置  
\* ：：： 把JFrame设为：Borderlayout  
\* :::: 把JPanel 布局设为：网格布局，2行1列并把其放置于Center  
\*  
\*  
\*  
\*  
\*  
\* \*/  
  
  
  
  
  
  
  
  
public class Login extends JFrame  
\{  
// 定义组件  
JTextField tf1,tf2,tf3;  
JLabel jlb1,jlb2,jlb3;  
JButton jb1,jb2,jb3;  
  
JPanel jp1,jp2,jp3;  
Font f1;  
Actionlistener actl;  
BackeImage image;  
  
  
  
  
  
  
  
  
public static void main(String\[\] args)  
\{  
Login login=new Login();  
  
\}  
  
public Login()  
\{  
image=new BackeImage();  
image.setBounds(0, 0, 360, 360);  
  
f1=new Font("宋体",Font.PLAIN,10);  
  
actl=new Actionlistener();  
  
tf2=new JTextField();  
tf2.setBounds(140,130,40,20);  
tf2.setBorder(BorderFactory.createLoweredBevelBorder());  
this.add(tf2);  
tf3=new JTextField();  
tf3.setBounds(140,180,50,20);  
tf3.setBorder(BorderFactory.createLoweredBevelBorder());  
this.add(tf3);  
jlb1=new JLabel("用户名：");  
jlb1.setBounds(60, 130, 70, 50);  
this.add(jlb1);  
  
jlb2=new JLabel("密码：");  
jlb2.setBounds(60,180,50,20);  
this.add(jlb2);  
jlb3=new JLabel("欢迎登录！");  
jlb3.setBounds(120, 1, 80,80 );  
this.add(jlb3);  
  
jb1=new JButton("登录");  
jb1.addActionListener(actl);  
//jb1=new JButton("登录");  
jb1.setFont(f1);  
jb1.setBounds(100, 150+100, 50+30,30);  
this.add(jb1);  
jb2=new JButton("cancel");//jb2=new JButton("取消");  
jb2.setFont(f1);  
jb2.setBounds(170+50, 150+100,50+30, 30);  
this.add(jb2);  
// jp1=new JPanel();  
// jp1.setBounds(120, 50, 80, 80);  
//jp2=new JPanel();  
//jp2.setBounds(50, 60, 280,50);  
//jp3=new JPanel();  
//jp3.setBounds(100, 150, 280, 50);  
  
  
// 设置面板的布局管理器  
/\* jp1.setLayout(new GridLayout(1,1));  
jp2.setLayout(new FlowLayout());  
jp3.setLayout(new GridLayout(1,2));  
\*/  
// 把组件加入面板  
// jp1.add(jlb3);  
  
//jp2.add(jlb1);  
//jp2.add(tf2);  
//jp2.add(jlb2);  
//jp2.add(tf3);  
  
  
//jp3.add(jb1);  
//jp3.add(jb2);  
//jp3.setBounds(50, 50, 100, 100);  
  
  
  
  
// 设置框架  
  
this.setLayout(null);  
// 这里采取使用 ：空布局设计登录界面  
//this.setLayout(new GridLayout(3,1));  
  
this.add(image);  
this.setTitle("欢迎登录");  
this.setLocation(300, 300);  
this.setSize(350,350);  
  
this.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);  
this.setVisible(true);  
  
//  
int width=getToolkit().getDefaultToolkit().getScreenSize().width;  
int height=getToolkit().getDefaultToolkit().getScreenSize().height;  
  
\}  
  
// 定义一个背景面板  
  
class BackeImage extends JPanel  
\{  
Image im;  
public BackeImage()  
\{  
try \{  
im=ImageIO.read(new File("image//login.jpg"));  
\} catch (IOException e) \{  
// TODO Auto-generated catch block  
e.printStackTrace();  
\}  
  
  
  
  
  
  
  
\}  
//创建一个BackImage对象  
//BackImage bi=new BackImage();  
//this.setLayout(null);如果有这句话，那么必须要bi.setBounds(0, 0, 360, 360)这句话才能显示图片  
//bi.setBounds(0, 0, 360, 360);  
//取消JDialog上面的那个蓝色的框  
//this.add(bi);  
  
  
public void paintComponent(Graphics g)  
\{  
g.drawImage(im, 0, 0, 360, 360, this);  
\}  
  
  
\}  
  
  
// 监听器类  
class Actionlistener implements ActionListener  
\{  
  
  
@Override  
public void actionPerformed(ActionEvent e)  
  
\{  
System.out.println("执行了");  
  
if(e.getSource()==jb1)  
\{  
String name=tf2.getText().trim();  
System.out.println("用户输入的登录名："+name);  
String passw=tf3.getText().trim();  
System.out.println(passw);  
UserCheck uc=new UserCheck();  
uc.check(name,passw);  
  
  
\}  
else if(e.getSource()==jb2)  
\{  
  
\}  
  
\}  
  
  
\}  
  
  
\}