login.java

运用java编写图书馆管理系统

import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.Toolkit;

import javax.swing.*;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.StringTokenizer;

public class Login {
	public static void main(String[] args) {
		Loginframe frame = new Loginframe();
		frame.setTitle("java图书馆系统登陆");
	      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	      frame.setVisible(true);
	}
	private String name;
	public String getName(){
		return name;
	}
}
class Loginframe extends JFrame{
	public Loginframe(){
		Toolkit kit = Toolkit.getDefaultToolkit();
		Image img = kit.getImage("pic//icon.png");
	    setIconImage(img);
	    
		setTitle("java图书馆系统");
		setSize(400,200);
		setLocation(300,200);		
		label1=new JLabel("请登陆图书馆系统");
		//输入用户名
		label2=new JLabel("用户名:");
		tf1=new JTextField(20);
		tf1.setMaximumSize(tf1.getPreferredSize());	
		box1=Box.createHorizontalBox();
		box1.add(label2);
		box1.add(Box.createHorizontalStrut(10));
		box1.add(tf1);
		//输入密码
		label3=new JLabel("密码:  ");
		tf2=new JPasswordField(20);
		tf2.setMaximumSize(tf2.getPreferredSize());	
		box2=Box.createHorizontalBox();
		box2.add(label3);
		box2.add(Box.createHorizontalStrut(10));
		box2.add(tf2);
		//按钮
		bt1=new JButton("管理员登陆");
		bt2=new JButton("学生登陆");
		box3=Box.createHorizontalBox();
		box3.add(bt1);
		box3.add(Box.createHorizontalStrut(15));
		box3.add(bt2);
		//合成组件
		tbox=Box.createVerticalBox();
		tbox.add(label1);
		tbox.add(box1);
		tbox.add(box2);
		tbox.add(box3);		
		//将组件放入内容中
		add(tbox,BorderLayout.CENTER);
		//按钮功能
		bt1.addActionListener(new mok());
		bt2.addActionListener(new sok());
		
	}

	class mok implements ActionListener{
		public void actionPerformed(ActionEvent avt){
			Denglu("login.txt");
			if (tof==true){
				setVisible(false);
				ManagerView MV=new ManagerView();
				MV.setTitle("管理员"+name+"进入图书馆管理系统");
			    MV.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				MV.setSize(850, 500);
				MV.setLocation(200, 180);
			    MV.setVisible(true);
			}
			else{
				JOptionPane.showMessageDialog(null,"用户名或密码输入错误！");
			}
		}
	}
	public void Denglu(String Filename){
		String tefi1=tf1.getText();
		String tefi2=tf2.getText();
		String password,r;
		try{
			if (tefi1.trim().length()==0)
			{
				JOptionPane.showMessageDialog(null,"请输入用户名！");
			}
			else if (tefi2.trim().length()==0)
			{
				JOptionPane.showMessageDialog(null,"请输入密码！");
			}
			else{
				FileReader fr = new FileReader(Filename);
				BufferedReader br = new BufferedReader(fr);
				while ((r = br.readLine()) != null) {
					StringTokenizer sto = new StringTokenizer(r);
					name = sto.nextToken();
					password = sto.nextToken();
					if (tefi1.equals(name) && tefi2.equals(password)) {
						tof = true;
						break;
					}
				}// 验证登陆员号码及密码
			}				
		}catch(Exception e){
			   JOptionPane.showMessageDialog(null,"请重新输入！");
		   }
		try {
			Writer fr = new FileWriter("deng.txt", false);// 使得记录时不会覆盖
			fr.write(name+"\r\n");
			fr.flush();
			fr.close();
		}catch (IOException ie) {
			System.err.println("error:" + ie.getMessage());
		}
	}
	class sok implements ActionListener{
		public void actionPerformed(ActionEvent avt){
			Denglu("stulogin.txt");
			if (tof==true){
				setVisible(false);
				StudentView SV=new StudentView();
				SV.setTitle("学生"+name+"进入图书馆管理系统");
			    SV.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				SV.setSize(850, 500);
				SV.setLocation(200, 180);
			    SV.setVisible(true);			    
			}
			else{
				JOptionPane.showMessageDialog(null,"用户名或密码输入错误！");
			}
		}
	}	
	private JLabel label1,label2,label3;
	private JTextField tf1;
	private JPasswordField tf2;
	private JButton bt1,bt2;
	private Box box1,box2,box3,tbox;
	private boolean tof=false;
	private String name;

	
}