loginframe.java~8~

基于JB的网络数据库系统开发

package simpleusers;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class LoginFrame extends JFrame {
  Connection con = null;
  Statement stmt = null;
  ResultSet rs = null;
  JLabel jLabel1 = new JLabel();
  JLabel jLabel2 = new JLabel();
  JTextField jT1 = new JTextField();
  JPasswordField jP1 = new JPasswordField();
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();

  public LoginFrame() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit() throws Exception {
    jLabel1.setFont(new java.awt.Font("Dialog", 0, 16));
    jLabel1.setText("用户名");
    jLabel1.setBounds(new Rectangle(63, 46, 61, 30));
    this.setTitle("用户管理系统-用户登录");
    this.getContentPane().setLayout(null);
    jLabel2.setBounds(new Rectangle(63, 102, 61, 30));
    jLabel2.setText("密     码");
    jLabel2.setFont(new java.awt.Font("Dialog", 0, 16));
    jT1.setFont(new java.awt.Font("Dialog", 0, 16));
    jT1.setText("");
    jT1.setBounds(new Rectangle(137, 46, 131, 37));
    jP1.setText("");
    jP1.setBounds(new Rectangle(137, 102, 131, 37));
    jButton1.setBounds(new Rectangle(69, 175, 69, 39));
    jButton1.setFont(new java.awt.Font("Dialog", 0, 14));
    jButton1.setText("确定");
    jButton1.addActionListener(new LoginFrame_jButton1_actionAdapter(this));
    jButton2.setText("重置");
    jButton2.setFont(new java.awt.Font("Dialog", 0, 14));
    jButton2.setBounds(new Rectangle(184, 175, 69, 39));
    this.getContentPane().add(jLabel1, null);
    this.getContentPane().add(jT1, null);
    this.getContentPane().add(jP1, null);
    this.getContentPane().add(jLabel2, null);
    this.getContentPane().add(jButton1, null);
    this.getContentPane().add(jButton2, null);
  }

  void jButton1_actionPerformed(ActionEvent e) {
    String username=jT1.getText().trim();
    String password=jP1.getText().trim();
    String sql="select * from userandpwd where username='"+username+
        "' and pwd='"+password+"'";
    String msg=null;
    try{
      Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
    }catch(ClassNotFoundException e1){
      System.out.println("加载JDBC数据库驱动程序出错");
    }
    String url="jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=Test";
    try{
      con = DriverManager.getConnection(url, "sa", "");
      stmt = con.createStatement();
      rs = stmt.executeQuery(sql);
    }catch(SQLException e2){
      System.out.println("数据库连接出错");
    }
    try{
      if (rs.next())
         msg="欢迎你登录用户管理系统!\n"+
             "你输入的用户名称为"+rs.getString("username")+
             ".\n你输入的密码为"+rs.getString("pwd")+".";
      else
        msg="对不起，你输入的信息不正确！";
    }catch(SQLException e3 ){
      System.out.println("读取数据出错");
    }
    try{
      rs.close();
      stmt.close();
      con.close();
    }catch(SQLException e4){
      System.out.println("关闭对象连接出错");
    }
    MessageFrame m1=new MessageFrame(msg);
    m1.setSize(340,280);
    this.dispose();
    m1.show();

  }
}

class LoginFrame_jButton1_actionAdapter implements java.awt.event.ActionListener {
  LoginFrame adaptee;

  LoginFrame_jButton1_actionAdapter(LoginFrame adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e);
  }
}