login_frm.java

库存管理信息系统

package KcglSys;

import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import javax.swing.border.*;

/**
 * <p>Title: 库存管理信息系统</p>
 * <p>Description: 库存管理信息系统,企业好助手。</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: dragon</p>
 * @author ios
 * @version 1.0
 */

public class Login_Frm
    extends JFrame {
  JPanel contentPane;
  XYLayout xYLayout1 = new XYLayout();
  JLabel jLabel1 = new JLabel();
  JSeparator jSeparator1 = new JSeparator();
  JLabel jLabel2 = new JLabel();
  JLabel jLabel3 = new JLabel();
  JPasswordField jPasswordField1 = new JPasswordField();
  JButton jButton2 = new JButton();
  JButton jButton1 = new JButton();
  TitledBorder titledBorder1;
  TitledBorder titledBorder2;
  JLabel ImgLabel = new JLabel();
  JTextField jTextField1 = new JTextField();

  //Construct the frame
  public Login_Frm() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  //Component initialization
  private void jbInit() throws Exception {
    contentPane = (JPanel)this.getContentPane();
    titledBorder1 = new TitledBorder("");
    titledBorder2 = new TitledBorder("");
    jLabel1.setFont(new java.awt.Font("Dialog", 0, 14));
    jLabel1.setIcon(null);
    jLabel1.setText("请键入用户名及密码以登录系统");
    contentPane.setLayout(xYLayout1);
    this.setResizable(false);
    this.setSize(new Dimension(399, 208));
    this.setTitle("用户登录");
    jLabel2.setFont(new java.awt.Font("Dialog", 0, 13));
    jLabel2.setText("用户名：");
    jLabel3.setFont(new java.awt.Font("Dialog", 0, 13));
    jLabel3.setText("密   码：");
    jPasswordField1.setText("");
    jPasswordField1.setColumns(0);
    jButton2.setText("退出");
    jButton2.addActionListener(new Login_Frm_jButton2_actionAdapter(this));
    jButton1.setText("确认");
    jButton1.addActionListener(new Login_Frm_jButton1_actionAdapter(this));
    contentPane.setBackground(Color.lightGray);
    contentPane.setBorder(titledBorder2);
    ImgLabel.setIcon(new ImageIcon("login_pic.png"));
    ImgLabel.setText("");
    contentPane.add(jSeparator1, new XYConstraints(23, 61, 329, 8));
    contentPane.add(jLabel2, new XYConstraints(71, 94, -1, -1));
    contentPane.add(jLabel3, new XYConstraints(71, 135, -1, -1));
    contentPane.add(jPasswordField1, new XYConstraints(127, 129, 117, -1));
    contentPane.add(jButton1, new XYConstraints(298, 88, -1, -1));
    contentPane.add(jButton2, new XYConstraints(298, 129, -1, -1));
    contentPane.add(jLabel1, new XYConstraints(64, 34, 230, 30));
    contentPane.add(ImgLabel, new XYConstraints(25, 30, -1, 30));
    contentPane.add(jTextField1,      new XYConstraints(127, 92, 117, -1));
  }

  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }


  void jButton2_actionPerformed(ActionEvent e) {
    System.exit(0);
  }

  void jButton1_actionPerformed(ActionEvent e) {
    //实例化ErrorCheck类，该类是由我们创建的用于检验字符串的合法性
    ErrorCheck errmsg = new ErrorCheck();
    ResultSet rs = null;
    //实例化ConnectDBBean用于查询帐户的有效性，以登陆主界面
    ConnectDBBean conndb = new ConnectDBBean();
    String name = jTextField1.getText();
    String password = jPasswordField1.getText();
    //sql查询语句，用于核查用户和密码
    String sql = "select * from usersinfo where username='" + name +
        "' and password='" + password + "'";
    //检查输入是否为空
    if (!errmsg.isEmpty(password)) {
      try {
        rs = conndb.executeQuery(sql); //执行查询

        if (rs.next()) { //判断结果集是否存在
          //实例化GetFrmCentershow，该类是由我们创建的用于实现窗口中心显示
          GetFrmCenterShow gfc = new GetFrmCenterShow();
          //实例化Main_frame
          Main_Frm frame = new Main_Frm();
          //让frame显示在屏幕中心
          gfc.get_center(frame);
          //frame的显示
          frame.show();
          //本窗体的退出
          this.dispose();
        }
        else {
          //错误提示
          JOptionPane.showMessageDialog(null, "对不起，您不是合法用户！");
        }

      }
      catch (SQLException ex) {
        System.err.println("sql error!");
      }
    }
    else {
      JOptionPane.showMessageDialog(null, "密码不能为空，请正确输入！");
    }

  }
}

class Login_Frm_jButton2_actionAdapter
    implements java.awt.event.ActionListener {
  Login_Frm adaptee;

  Login_Frm_jButton2_actionAdapter(Login_Frm adaptee) {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e) {
    adaptee.jButton2_actionPerformed(e);
  }
}

class Login_Frm_jButton1_actionAdapter
    implements java.awt.event.ActionListener {
  Login_Frm adaptee;

  Login_Frm_jButton1_actionAdapter(Login_Frm adaptee) {
    this.adaptee = adaptee;
  }

  public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e);
  }
}