loginframe.java

简单的登录系统

/*
 *系统登录界面
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class LoginFrame extends javax.swing.JFrame {
    private String inputName;//接收用户输入的登录名
    private String inputPassword;//接收用户输入的密码
    
    /** 类的构造方法*/
    public LoginFrame() {
        initComponents();//初始化窗体各组件
        this.setVisible(true);
        this.setResizable(false);
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" 生成的代码 ">//GEN-BEGIN:initComponents
    private void initComponents() {
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jPasswordField1 = new javax.swing.JPasswordField();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jLabel3 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setBounds(new java.awt.Rectangle(400, 300, 200, 200));
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                formWindowClosing(evt);
            }
        });

        jLabel1.setFont(new java.awt.Font("宋体", 1, 14));
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
        jLabel1.setText("\u767b\u5f55\u540d");

        jLabel2.setFont(new java.awt.Font("宋体", 1, 14));
        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
        jLabel2.setText("\u5bc6\u7801");

        jTextField1.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyTyped(java.awt.event.KeyEvent evt) {
                jTextField1KeyTyped(evt);
            }
        });

        jPasswordField1.setEchoChar('*');
        jPasswordField1.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyTyped(java.awt.event.KeyEvent evt) {
                jPasswordField1KeyTyped(evt);
            }
        });

        jButton1.setText("\u767b\u5f55");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("\u6ce8\u518c");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jLabel3.setFont(new java.awt.Font("宋体", 1, 12));
        jLabel3.setForeground(new java.awt.Color(204, 0, 0));
        jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(60, 60, 60)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jLabel1)
                    .addComponent(jLabel2))
                .addGap(37, 37, 37)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jTextField1)
                    .addComponent(jPasswordField1, javax.swing.GroupLayout.DEFAULT_SIZE, 130, Short.MAX_VALUE))
                .addContainerGap(66, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(98, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(53, 53, 53)
                .addComponent(jButton2)
                .addGap(73, 73, 73))
            .addGroup(layout.createSequentialGroup()
                .addGap(57, 57, 57)
                .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 250, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(31, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(15, 15, 15)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(36, 36, 36)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(21, 21, 21)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton2)
                    .addComponent(jButton1))
                .addContainerGap(33, Short.MAX_VALUE))
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void jPasswordField1KeyTyped(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_jPasswordField1KeyTyped
        jLabel3.setText("");//重新输入密码时，取消错误提示
    }//GEN-LAST:event_jPasswordField1KeyTyped

    private void jTextField1KeyTyped(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_jTextField1KeyTyped
        jLabel3.setText("");//重新输入登录名时，取消错误提示
    }//GEN-LAST:event_jTextField1KeyTyped

    private void formWindowClosing(java.awt.event.WindowEvent evt) {//GEN-FIRST:event_formWindowClosing
        System.exit(0);//用户点击“关闭”按钮时，退出登录界面
    }//GEN-LAST:event_formWindowClosing

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
        new Register();//当点击“注册”按钮时，进入注册新用户界面
    }//GEN-LAST:event_jButton2ActionPerformed

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
        this.check();//当用户点击“确定”按钮后，调用此方法，开始输入信息验证的操作
    }//GEN-LAST:event_jButton1ActionPerformed
    /**
     *接收用户输入的登录名和密码信息，调用 JDBC  类里的方法对输入信息进行判断。
     *若登录名和密码通过验证，会进入到系统主界面；
     *若未通过验证，则显示出错信息，并等待用户的重新输入。
     */
    private void check() {
        inputName = jTextField1.getText();//接收用户输入的登录名
        inputPassword = String.valueOf(jPasswordField1.getPassword());//接收用户输入的密码
   
        JDBC jdbc = new JDBC();//连接数据库

        //验证登录名和密码
        if (jdbc.checkPassword(inputName,inputPassword)) {
            setVisible(false);//关闭登录界面
            new MainFrame(inputName);//进入系统主界面
        } else {
            jLabel3.setText("用户名或密码错误，请重新输入！");
        }
    }
    // 变量声明 - 不进行修改//GEN-BEGIN:variables
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPasswordField jPasswordField1;
    private javax.swing.JTextField jTextField1;
    // 变量声明结束//GEN-END:variables
    
}