passwordchange.java

这是一个用jbuilder2005编写的图书管理系统

package bookmanage;

import java.awt.*;
import javax.swing.*;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * <p>Title: 图书管理系统</p>
 *
 * <p>Description: PasswordChange类是用来修改管理员的密码</p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: 浙江工业大学信息学院计算机系</p>
 *
 * @author 曾文秋
 * @version 1.0
 */
public class PasswordChange
    extends JDialog {
  JLabel jLabel1 = new JLabel();
  JTextField jTextFieldName = new JTextField();//用户名
  JPasswordField jTextFieldOldPassword = new JPasswordField();//旧密码
  JLabel jLabel2 = new JLabel();
  JLabel jLabel3 = new JLabel();
  JPasswordField jTextFieldNewPassword = new JPasswordField();//新密码
  JPasswordField jTextFieldAffirmPassword = new JPasswordField();//确认密码
  JLabel jLabel4 = new JLabel();
  JButton jButtonAlter = new JButton();//修改按钮
  JButton jButtonCancel = new JButton();//取消按钮

  ResultSet rs;//定义结果集
  private DBManager db = new DBManager();//定义数据库操作对象
  String strSQL=null;//存放SQL语句

  /**
   * 构造函数
   * @param owner Frame
   * @param title String
   * @param modal boolean
   */
  public PasswordChange(Frame owner, String title, boolean modal) {
    super(owner, title, modal);
    try {
      setDefaultCloseOperation(DISPOSE_ON_CLOSE);
      jbInit();
      pack();
    }
    catch (Exception exception) {
      exception.printStackTrace();
    }
  }

  public PasswordChange() {
    this(new Frame(), "PasswordChange", false);
  }

  /**
   * 初始化窗口
   * @throws Exception
   */
  private void jbInit() throws Exception {
    this.getContentPane().setLayout(null);
    this.setResizable(false);
    this.setTitle("管理员密码修改");
    jLabel1.setText("用户名：");
    jLabel1.setBounds(new Rectangle(66, 39, 55, 24));
    jTextFieldName.setBounds(new Rectangle(137, 39, 92, 25));
    jTextFieldName.setEditable(false);
    jTextFieldName.setText(MainFrame.UserName);
    jTextFieldOldPassword.setBounds(new Rectangle(137, 80, 92, 25));
    jLabel2.setText("旧密码：");
    jLabel2.setBounds(new Rectangle(66, 80, 55, 24));
    jLabel3.setText("新密码：");
    jLabel3.setBounds(new Rectangle(66, 122, 55, 24));
    jTextFieldNewPassword.setBounds(new Rectangle(137, 122, 92, 25));
    jTextFieldAffirmPassword.setBounds(new Rectangle(137, 163, 92, 25));
    jLabel4.setText("确认密码：");
    jLabel4.setBounds(new Rectangle(66, 163, 64, 24));
    jButtonAlter.setBounds(new Rectangle(54, 214, 81, 23));
    jButtonAlter.setText("确认修改");
    //增加事件监听
    jButtonAlter.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButtonAlter_actionPerformed(e);
      }
    });
    jButtonCancel.setBounds(new Rectangle(170, 214, 81, 23));
    jButtonCancel.setText("取消");
    jButtonCancel.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButtonCancel_actionPerformed(e);
      }
    });
    //将下列组件加入到容器中
    this.getContentPane().add(jLabel3);
    this.getContentPane().add(jLabel4);
    this.getContentPane().add(jTextFieldName);
    this.getContentPane().add(jTextFieldOldPassword);
    this.getContentPane().add(jTextFieldNewPassword);
    this.getContentPane().add(jTextFieldAffirmPassword);
    this.getContentPane().add(jLabel1);
    this.getContentPane().add(jLabel2);
    this.getContentPane().add(jButtonCancel);
    this.getContentPane().add(jButtonAlter);
  }

  /**
   * 按下修改按钮后所触发的事件
   *
   * @param e ActionEvent
   */
  public void jButtonAlter_actionPerformed(ActionEvent e) {
    String UserName=null;
    String OldPassword=null;
    String NewPassword=null;
    String AffirmPassword=null;
    UserName=jTextFieldName.getText();//获得用户名
    UserName=UserName.trim();
    OldPassword=new String(jTextFieldOldPassword.getPassword());//获得旧密码
    OldPassword=OldPassword.trim();
    NewPassword=new String(jTextFieldNewPassword.getPassword());//获得新密码
    NewPassword=NewPassword.trim();
    AffirmPassword=new String(jTextFieldAffirmPassword.getPassword());//获得确认密码
    AffirmPassword=AffirmPassword.trim();
    //校验用户名是否为空
    if(UserName.equals("")){
      JOptionPane.showMessageDialog(this, "用户名不许为空！");
      return;
    }
    //校验原密码是否为空
    if(OldPassword.equals("")){
      JOptionPane.showMessageDialog(this, "旧密码不许为空！");
      return;
    }
    if(NewPassword.equals("")){
      JOptionPane.showMessageDialog(this, "新密码不许为空！");
      return;
    }
    if(AffirmPassword.equals("")){
      JOptionPane.showMessageDialog(this, "确认密码不许为空！");
      return;
    }
    //检验用户两次输入的密码是否一致
    if(!NewPassword.equals(AffirmPassword)){
      JOptionPane.showMessageDialog(this, "两次输入的密码不一致！");
      jTextFieldNewPassword.setText("");
      jTextFieldAffirmPassword.setText("");
      return;
    }

    //检验用户名是否存在
    strSQL = "select * from administrator where id='" +
        UserName + "' and password='" +
        OldPassword + "'";
    rs = db.getResult(strSQL);//得到满足条件的结果集
    boolean isexist = false;
    try {
      isexist = rs.first();
    }
    catch (SQLException ex1) {
    }
    //若用户名不存在，提示警告信息提醒用户从新输入
    if (!isexist){
      JOptionPane.showMessageDialog(null, "原密码不正确！");
      jTextFieldOldPassword.setText("");
      return;
    }
    //若存在，执行更新操作
    else {
      //生成更新sql语句
      strSQL = "update administrator set password='" + NewPassword +
          "' where id='" + UserName + "'";
      //由数据库操作对象执行数据库操作，并返回操作成功失败的提示信息
      if (db.executeSql(strSQL)) {
        JOptionPane.showMessageDialog(null, "成功更新！");
        this.dispose();//销毁窗口
      }
      else {
        JOptionPane.showMessageDialog(null, " 更新失败，请重新操作！");
      }
    }
    db.close();
  }

  public void jButtonCancel_actionPerformed(ActionEvent e) {
    this.dispose();//销毁窗口
  }
}