userlogin.java

图书馆系统

import java.awt.BorderLayout;
import javax.swing.JPanel;
import java.awt.GraphicsConfiguration;
import java.awt.HeadlessException;

import javax.swing.JFrame;
import java.awt.Label;
import java.awt.Rectangle;
import java.awt.Font;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.TextField;
import java.awt.Button;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import java.awt.event.*;
import java.sql.*;

public class userLogin extends JFrame {

	private static final long serialVersionUID = 1L;

	private JPanel jContentPane = null;

	private Label label1 = null;

	private Label label2 = null;

	private Button jButtonOK = null;

	private Button jButtonCancel = null;

	private JTextField jTextFieldusername = null;

	private JPasswordField jPasswordold = null;

	private JLabel jLabel = null;
	
	ResultSet rs;
	private DBManager db=new DBManager();  //  @jve:decl-index=0:
	BookManagerMain myMain;
	public userLogin(BookManagerMain bMain){
		//this(null,"",false);
		this();
		myMain=bMain;
	}

	public userLogin() throws HeadlessException {
		// TODO 自动生成构造函数存根
		super();
		initialize();
	}

	public userLogin(GraphicsConfiguration arg0) {
		super(arg0);
		// TODO 自动生成构造函数存根
		initialize();
	}

	public userLogin(String arg0) throws HeadlessException {
		super(arg0);
		// TODO 自动生成构造函数存根
		initialize();
	}

	public userLogin(String arg0, GraphicsConfiguration arg1) {
		super(arg0, arg1);
		// TODO 自动生成构造函数存根
		initialize();
	}

	/**
	 * This method initializes this
	 * 
	 * @return void
	 */
	private void initialize() {
		this.setSize(327, 216);
		this.setContentPane(getJContentPane());
		this.setTitle("用户登录");
	}

	/**
	 * This method initializes jContentPane
	 * 
	 * @return javax.swing.JPanel
	 */
	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jLabel = new JLabel();
			jLabel.setBounds(new Rectangle(48, 14, 150, 18));
			jLabel.setText("登录后才可使用该系统！");
			label2 = new Label();
			label2.setAlignment(Label.CENTER);
			label2.setFont(new Font("Dialog", Font.PLAIN, 14));
			label2.setSize(new Dimension(64, 23));
			label2.setLocation(new Point(49, 76));
			label2.setText("密码");
			label1 = new Label();
			label1.setText("用户名");
			label1.setAlignment(Label.CENTER);
			label1.setLocation(new Point(49, 40));
			label1.setSize(new Dimension(64, 23));
			label1.setFont(new Font("Dialog", Font.PLAIN, 14));
			jContentPane = new JPanel();
			jContentPane.setLayout(null);
			jContentPane.setFont(new Font("Dialog", Font.PLAIN, 14));
			jContentPane.add(label1, null);
			jContentPane.add(label2, null);
			jContentPane.add(getJButtonOK(), null);
			jContentPane.add(getJButtonCancel(), null);
			jContentPane.add(getJTextFieldusername(), null);
			jContentPane.add(getJPasswordold(), null);
			jContentPane.add(jLabel, null);
		}
		return jContentPane;
	}

	/**
	 * This method initializes jButtonOK	
	 * 	
	 * @return java.awt.Button	
	 */
	private void buttonexit(){
		this.dispose();
	}
	public void dianjiok(){
		System.out.println("actionPerformed()"); // TODO Auto-generated Event stub actionPerformed()
		//检验用户名是否为空
		if(jTextFieldusername.getText().trim().equals("")){
			JOptionPane.showMessageDialog(null, "用户名不能为空", "错误", JOptionPane.ERROR_MESSAGE);
			return;
		}
		//检验密码是否为空
		if(jPasswordold.getText().trim().equals("")){
			JOptionPane.showMessageDialog(null, "密码不能为空", "错误", JOptionPane.ERROR_MESSAGE);
			return;
		}
		String strSQL;					
		strSQL ="SELECT * FROM alluser WHERE Username="+"'"+
		     jTextFieldusername.getText().trim()+"'"+" AND aPassword=" +"'"+
		     jPasswordold.getText().trim()+"'";System.out.println(strSQL);
		rs=db.getResult(strSQL);		
				try{
					rs.first();
					myMain.setEnable(rs.getString("aPower".trim()));
					myMain.atitle="登录成功，欢迎使用图书管理系统！";
					//this.dispose();
					buttonexit();
					
				}
				catch(SQLException ex){
					JOptionPane.showMessageDialog(null, "用户名不存在，或密码不正确", "错误", JOptionPane.ERROR_MESSAGE);
					this.jTextFieldusername.setText("");
					this.jPasswordold.setText("");
				}		
	}		
	
		
	
	private Button getJButtonOK() {
		if (jButtonOK == null) {
			jButtonOK = new Button();
			jButtonOK.setBounds(new Rectangle(67, 121, 65, 29));
			jButtonOK.setFont(new Font("Dialog", Font.PLAIN, 14));
			jButtonOK.setLabel("确定");
			jButtonOK.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					dianjiok();
					//myMain.setEnable("管理员");
					//myMain.setatitle();
					//buttonexit();//目前测试用，因数据库连接有问题
				}
			});
		}
		return jButtonOK;
	}

	/**
	 * This method initializes jButtonCancel	
	 * 	
	 * @return java.awt.Button	
	 */
	
	private Button getJButtonCancel() {
		if (jButtonCancel == null) {
			jButtonCancel = new Button();
			jButtonCancel.setLocation(new Point(169, 121));
			jButtonCancel.setLabel("取消");
			jButtonCancel.setSize(new Dimension(65, 29));
			jButtonCancel.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					System.out.println("actionPerformed()"); // TODO Auto-generated Event stub actionPerformed()
					buttonexit();
					myMain.setEnable("false");
					
				}
			});
		}
		return jButtonCancel;
	}

	/**
	 * This method initializes jTextFieldusername	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getJTextFieldusername() {
		if (jTextFieldusername == null) {
			jTextFieldusername = new JTextField();
			jTextFieldusername.setLocation(new Point(143, 40));
			jTextFieldusername.setSize(new Dimension(111, 23));
		}
		return jTextFieldusername;
	}

	/**
	 * This method initializes jPasswordold	
	 * 	
	 * @return javax.swing.JPasswordField	
	 */
	private JPasswordField getJPasswordold() {
		if (jPasswordold == null) {
			jPasswordold = new JPasswordField();
			jPasswordold.setLocation(new Point(143, 76));
			jPasswordold.setSize(new Dimension(111, 23));
		}
		return jPasswordold;
	}
	

}  //  @jve:decl-index=0:visual-constraint="10,10"