java图书管理系统登录界面和验证
java图书管理系统登录界面和验证
1 首先将 “密码.txt”
放在F盘根目录下，内容为：
然后将图标放在 工作文件夹下面（当然也可以指定路径）
2 建立两个类：
一 框架
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
public class LibraryloginFrame extends JFrame{
public LibraryloginFrame()
{
setTitle("图书管理系统-登陆"); //设置标题
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);//设置大小
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize =kit.getScreenSize();
double WIDTH=screenSize.getWidth();
double HEIGHT =screenSize.getHeight();
this.setBounds((int)WIDTH/2,(int)HEIGHT/2,DEFAULT_WIDTH,DEFAULT_HEIGHT);
Image ima = kit.getImage("Office2010.jpg");//设置图标
setIconImage(ima);
//设置观感
String plaf = "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel";
try {
UIManager.setLookAndFeel(plaf);
} catch (ClassNotFoundException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (InstantiationException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (IllegalAccessException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (UnsupportedLookAndFeelException e2) {
e2.printStackTrace();
}
SwingUtilities.updateComponentTreeUI(this);
File file = new File("F:\\密码.txt");//打开保存的密码
try {
FileReader reader = new FileReader(file);
BufferedReader bf = new BufferedReader(reader);
reader.close();
bf.close();
try {
password2 = bf.readLine();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
final JTextField textField = new JTextField();
final JPasswordField passwordField = new JPasswordField();
passwordField.setEchoChar('*');
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(2,2));
JLabel left1 = new JLabel("User name:",SwingConstants.CENTER);
JLabel left2 = new JLabel("Password:",SwingConstants.CENTER);
northPanel.add(left1);
northPanel.add(textField);
northPanel.add(left2);
northPanel.add(passwordField);
BorderLayout bl = new BorderLayout();
this.setLayout(bl);
add(northPanel,BorderLayout.NORTH);
field = new JTextField(30);
this.add(field,BorderLayout.CENTER);
JPanel southPanel = new JPanel();
add(southPanel,BorderLayout.SOUTH);
JButton button = new JButton("确定");
southPanel.add(button);
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
text= textField.getText().trim();
password1 = new String(passwordField.getPassword());
result =text+password1;
if(result.equals(password2))//验证用户名和密码
{
field.setText("恭喜你，登陆成功!!") ;
}else {
field.setText("对不起，账号或密码错误，请重新输入!!") ;
textField.setText("");
passwordField.setText("");
}
}});
}
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT =200;
private JTextField field;//显示登陆结果
private String text;//放用户名
private String password1;//放登陆密码
private String result;//放用户名+密码
private String password2;//放从密码文件里读取的密码
}
二 运行类
import java.awt.EventQueue;
import javax.swing.JFrame;
public class LibraryloginText {
public static void main(String[] args)
{
// TODO Auto-generated method stub
EventQueue.invokeLater(new Runnable(){
public void run()
{
LibraryloginFrame frame = new LibraryloginFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
效果：
一
二
三