数据库课程设计_实验室管理系统_登录

package labor;

import java.awt.BorderLayout;
import java.awt.Choice;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class Load_Labor extends JFrame implements SwingConstants{
	private String select="管理员";
	String nameresult[]=new String[10];
	String passresult[]=new String[50];
	boolean Flag=false;
	private JLabel welcomela=null;
	private	 JLabel userla=null;
	private JLabel passwordla=null;
	private JLabel power=null;
	private JComboBox jcb=null;
	private JTextField userjt=null;
	private JPasswordField passwordjp=null;
	private JButton loadbtn=null;
	private JButton canclebtn=null;
	
	private JPanel inputJp=null;
	private JPanel btnJp=null;
	private JPanel panel=null;
	
	private JPanel imagePanel=null;
	private ImageIcon background=null;
	
	public Load_Labor(){
		super("用户登陆");
		init();
	}
	
	public void init(){
		this.setLayout(new FlowLayout());
		
		inputJp=new JPanel();
		btnJp=new JPanel();
		inputJp.setLayout(new GridLayout(3,2));
		welcomela=new JLabel("欢迎使用实验室管理系统");
		welcomela.setFont(new Font("欢迎使用实验室管理系统",1, 16));	
		welcomela.setHorizontalAlignment(JLabel.CENTER);
		welcomela.setForeground(Color.RED);
		userla=new JLabel("用户名:");
		passwordla=new JLabel("密    码:");
		power=new JLabel("权限：");
		userjt=new JTextField(10);
		passwordjp=new JPasswordField(10);
		jcb=new JComboBox();
		jcb.addItem("管理员");
		jcb.addItem("访客");
		loadbtn=new JButton("登陆");
		canclebtn=new JButton("退出");
		inputJp.add(userla,0);
		inputJp.add(userjt,1);		
		inputJp.add(passwordla,2);	
		inputJp.add(passwordjp,3);
		inputJp.add(power,4);
		inputJp.add(jcb,5);
		btnJp.add(loadbtn);
		btnJp.add(canclebtn);
		panel=new JPanel(new FlowLayout());
		panel.add(inputJp);
		panel.add(btnJp);
		background = new ImageIcon("E:/workspace/database/src/ImageFolder/password.png");// 背景图片		
		JLabel label = new JLabel(background);// 把背景图片显示在一个标签里面		
		// 把标签的大小位置设置为图片刚好填充整个面板		
		label.setBounds(0, 0, background.getIconWidth(),background.getIconHeight());		// 把内容窗格转化为JPanel，否则不能用方法setOpaque()来使内容窗格透明		
		imagePanel=(JPanel)this.getContentPane();		
		imagePanel.setOpaque(false);		// 内容窗格默认的布局管理器为BorderLayout		
		imagePanel.setLayout(new BorderLayout());
		imagePanel.add(welcomela,BorderLayout.NORTH );
		imagePanel.add(panel,BorderLayout.SOUTH);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);	
		this.getLayeredPane().setLayout(null);		// 把背景图片添加到分层窗格的最底层作为背景		
		this.getLayeredPane().add(label, new Integer(Integer.MIN_VALUE));	
		this.setSize(background.getIconWidth(),background.getIconHeight());
		this.setVisible(true);
		this.show();
		jcb.addItemListener(new ItemListener(){					
		public void itemStateChanged(ItemEvent ite) {
			if(ite.getStateChange() == ItemEvent.SELECTED){
				 try{
					 select = ite.getItem().toString();//选中的值
				 }catch (Exception e){
				      
				   }
				 } 
				}
		});
		loadbtn.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				int i=0;
				String userName=userjt.getText().trim();
				String passwordStr=passwordjp.getText().trim();
				DBConnection db=new DBConnection();
					String sql="select * from loadInfo";
					ResultSet rs;
					try {
						rs = db.executeQuery(sql);
						while(rs.next()){			
						nameresult[i]=rs.getString("laborname").trim();
						passresult[i]=rs.getString("laborpass").trim();
						i++;
					}
					} catch (SQLException e1) {
						e1.printStackTrace();
					}	
				if(select.equals("访客")){
					dispose();
					EquSearch_Labor vl=new EquSearch_Labor("访客");
				}
				else{
					for(int j=0;j<i;j++){
						if(nameresult[j].equals(userName)){
							if(passresult[j].equals(passwordStr)){
								Flag=true;
								break;
							}
						}
					}
					for(int j=0;j<i;j++){
						if((!nameresult[j].equals(userName))||(!passresult[j].equals(passwordStr))){
							JOptionPane.showMessageDialog(null, "用户或密码输入错误，请重新输入");
							userjt.setText(null);
							passwordjp.setText(null);
						}
					}
					System.out.println(Flag);
					if(Flag==true){	
						dispose();
						Mana_Labor ul=new Mana_Labor();
					}
				}
				
			}
			
		});
		canclebtn.addActionListener(new ActionListener() {
			
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
		this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
	}
	public static void main(String args[]){
		Load_Labor ld=new Load_Labor();
	}

}