login.java

该系统能够根据银行用户的要求

/*
 * 此类实现注册用户界面
 */
package guiPackage;

import static userPackage.ManageUser.InFile;
import static userPackage.ManageUser.addUser;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
	
	/*类LogIn用于模拟银行的申请帐户*/
	public class LogIn implements ActionListener{
		private JFrame frame;
		private Container contentPane;
		private JLabel userLbl, pwdLbl;
		private JLabel messLbl;
		private JPasswordField pwdTxt;
		private JTextField userTxt;
		private JButton okBtn, clearBtn, exitBtn;
		public LogIn(){
			frame = new JFrame("Apply for Account");
			frame.setBounds(300, 200, 300, 200);
			frame.setResizable(false);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			contentPane = frame.getContentPane();
			initGUI();
		}
		public void initGUI(){
			userLbl = new JLabel("username: ");
			pwdLbl = new JLabel("password: ");
			messLbl = new JLabel("welcome");
			userTxt = new JTextField(10);
			pwdTxt = new JPasswordField(10);
			JPanel panel0 = new JPanel(new FlowLayout(FlowLayout.LEFT));
			panel0.add(messLbl);
			JPanel panel11 = new JPanel(new FlowLayout());
			JPanel panel1 = new JPanel(new GridLayout(2, 1));
			JPanel panel12 = new JPanel(new FlowLayout());
			panel11.add(userLbl);
			panel11.add(userTxt);
			panel12.add(pwdLbl);
			panel12.add(pwdTxt);
			panel1.add(panel11);
			panel1.add(panel12);
			
			okBtn = new JButton("ok");
			clearBtn = new JButton("clear");
			exitBtn = new JButton("exit");
			JPanel panel2 = new JPanel(new FlowLayout());
			panel2.add(okBtn);
			panel2.add(clearBtn);
			panel2.add(exitBtn);
			
			JPanel pane = new JPanel(new BorderLayout());
			pane.add(panel0, BorderLayout.NORTH);
			pane.add(panel1, BorderLayout.CENTER);
			pane.add(panel2, BorderLayout.SOUTH);
			contentPane.add(pane);
			
			okBtn.addActionListener(this);
			clearBtn.addActionListener(this);
			exitBtn.addActionListener(this);
		}
		public void actionPerformed(ActionEvent e){
			if(e.getSource() == okBtn){
				//getText() 返回此 TextComponent(文本框)中包含的文本
				//toLowerCase()使用默认语言环境的规则将此 String 中的所有字符都转换为小写。
				//trim()返回字符串的副本，忽略前导空白和尾部空白
				String name = userTxt.getText().toLowerCase().trim();
				String password = pwdTxt.getText().toLowerCase().trim();
				if(name.length() == 0){
					messLbl.setText("user name cannot be empty!");
					userTxt.setText("");
					pwdTxt.setText("");
					userTxt.grabFocus();//用户名写框里得到交互点
				}
				else if(password.length() != 6){
					messLbl.setText("password must six position!");
					userTxt.setText("");
					pwdTxt.setText("");
					userTxt.grabFocus();
				}else{
					if(addUser(name, password)){
						messLbl.setText("Log In success!");
						userTxt.setText("");
	                pwdTxt.setText("");
	                userTxt.grabFocus();
						}
					else{
						messLbl.setText("repeat Log In!");
						userTxt.setText("");
						pwdTxt.setText("");
						userTxt.grabFocus();
						} 
				}
				return;
			}
			if(e.getSource() == clearBtn){
				userTxt.setText("");
				pwdTxt.setText("");
				userTxt.grabFocus();
				return;
			}
			//当天结束时保存信息于文件中
			if(e.getSource() == exitBtn){
				InFile();
				frame.hide();
			}
		}
		public void go(){
			frame.setVisible(true);
		}
	}