基于Java怎么实现QQ登录注册功能

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实现代码

登录页面

import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.sql.*;import java.time.LocalTime; public class JDBC_登录功能 {    public static void main(String[] args) {        guitext3 gt=new guitext3();       new Thread(new time1(gt.time)).start();//启动线程     }}class guitext3 {    JFrame jf;    JLabel l1,l2,time;    JTextField f1;    JPassWordField f2;    JButton jb1,jb2;    JCheckBox jc;    public guitext3() {        jf = new JFrame("QQ登录窗口");        jf.setSize(320,250);        jf.setLocation(700,300);//设置窗口每次启动都显示在屏幕正中央        jf.setLayout(null);        Font font = new Font("仿宋", Font.BOLD, 20);//设置统一的字体，让代码更加整洁美观        l1 = new JLabel("用户名：");        l1.setBounds(10,10,100,40);        l1.setFont(font);        f1 = new JTextField(null,20);        f1.setBounds(90,15,180,30);        f1.setFont(font);        l2 = new JLabel("密  码：");        l2.setBounds(8,50,100,40);        l2.setFont(font);        f2=new JPasswordField(null,20);        f2.setBounds(90,55,180,30);        f2.setEchoChar('*');//设置密码的外显为*        f2.setFont(font);        jc=new JCheckBox("显示密码");        jc.setBounds(230,130,80,40);        jc.addItemListener(new ItemListener() {            public void itemStateChanged(ItemEvent e) {                if (e.getStateChange() == ItemEvent.SELECTED) {//被选中                    f2.setEchoChar((char) 0);                } else {                    f2.setEchoChar('*');                }            }        });        ActionListener listener=new AbstractAction() {            @Override            public void actionPerfORMed(ActionEvent e) {             }        };        jc.addActionListener(listener);        jb1 = new JButton("登录");        jb1.setBounds(30,100,80,40);        time=new JLabel();        time.setBounds(30,150,140,40);        time.setFont(font);        //匿名内部类        jb1.addMouseListener(new MouseAdapter() {            public void mouseClicked(MouseEvent e) {                Statement st=null;                Connection con=null;                ResultSet rs=null;                try {                    //注册驱动                    Class.forName("com.mysql.cj.jdbc.Driver");                    //这里的3306/后跟的是数据库名                    //获取数据库连接                    String url="jdbc:Mysql://localhost:3306/students?serverTimezone=GMT%2B8";                    //通过DriverManager完成注册                    con= DriverManager.getConnection(url,"root","123");//你自己的数据库用户名和密码                    //执行SQL语句                    String sql="select * from student";//from 后跟表名                    st=con.createStatement();                    rs=st.executeQuery(sql);            boolean flag=false;            while(rs.next()){                //如果输入的用户名和密码与数据库中的用户和对应的密码相同，则弹出“登录成功！”的窗口                if(f1.getText().equals(rs.getString(1))&&f2.getText().equals(rs.getString(2))){                    JOptionPane.showMessageDialog(null, "登录成功！");                    flag=true;//登陆成功后将标记改为true方便确认                    break;                }            }            if(flag==false){//如果标记为false，则表示用户名和密码在数据库中未找到，弹出“登录失败！请注册账户！”的窗口                JOptionPane.showMessageDialog(null, "登录失败！请注册账户！");                f1.setText(null);//清空用户栏                f2.setText(null);//清空密码栏                //这个账号不存在，需要注册，跳转到注册窗口                guitext4 gt=new guitext4();                jf.dispose();//关闭窗体，释放所有资源            }                } catch (ClassNotFoundException ex) {                    ex.printStackTrace();                } catch (SQLException ex) {                    ex.printStackTrace();                }            }        });        jb1.setFont(font);        jb2 = new JButton("退出");        jb2.setBounds(150,100,80,40);        //匿名内部类        jb2.addMouseListener(new MouseAdapter() {            //重写鼠标点击事件            public void mouseClicked(MouseEvent e) {//如果点击了退出窗口，则弹出“退出成功！”的窗口                JOptionPane.showMessageDialog(null, "退出成功！");                //系统退出                System.exit(0);            }        });        jb2.setFont(font);        //将这些按钮和文本等加入到窗体中        jf.add(l1);        jf.add(f1);        jf.add(l2);        jf.add(f2);        jf.add(jb1);        jf.add(jb2);        jf.add(time);        jf.add(jc);        jf.setVisible(true);//让组件显示    }}//写一个时间线程类class time1 implements Runnable{    JLabel time;//方便传参    public time1(JLabel time) {        this.time = time;    }    public void run(){        while (true) {            try {                Thread.sleep(1000);//休眠1秒                LocalTime time=LocalTime.now();//获取当前时间                this.time.setText(time.toString());//设置JLabel文本                //SimpleDateFormat t = new SimpleDateFormat ("HH:mm:ss");//格式化时间，把时间格式化为时：分：秒               // this.time.setText(t.format(time));//给标签添加内容，即时间            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}

注册页面

import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.sql.*; public class JDBC_注册功能 {    public static void main(String[] args) {        guitext4 gt=new guitext4();    }}class guitext4{    JFrame jf;   // JPanel jp;    JLabel l1,l2,l3;    JTextField f1;    JPasswordField f2,f3;    JButton jb1,jb2;    JRadioButton jr1,jr2;    JCheckBox jc;    public guitext4() {        jf = new JFrame("QQ注册窗口");        jf.setSize(320,280);//设置窗体大小        jf.setLocation(700,300);//设置窗口每次启动都显示在屏幕正中央        jf.setLayout(null);       // jp = new JPanel();        Font font = new Font("仿宋", Font.BOLD, 20);//设置统一的字体，让代码更加整洁美观        l1 = new JLabel("用户名：");        l1.setBounds(10,10,100,40);        l1.setFont(font);        f1 = new JTextField(null,20);        f1.setBounds(90,15,180,30);        f1.setFont(font);            l2 = new JLabel("密  码：");            l2.setBounds(8, 50, 100, 40);            l2.setFont(font);            f2 = new JPasswordField(null, 20);            f2.setBounds(90, 55, 180, 30);            f2.setEchoChar('*');//设置密码的外显为*            f2.setFont(font);            l3 = new JLabel("确认密码：");            l3.setBounds(8, 88, 130, 40);            l3.setFont(font);            f3 = new JPasswordField(null, 20);            f3.setBounds(120, 95, 160, 30);            f3.setEchoChar('*');//设置密码的外显为*        jc=new JCheckBox("显示密码");//创建一个复选按钮        jc.setBounds(230,130,80,40);        jc.addItemListener(new ItemListener() {            public void itemStateChanged(ItemEvent e) {                if (e.getStateChange() == ItemEvent.SELECTED) {//被选中                    f2.setEchoChar((char) 0);//显示原本的数据                    f3.setEchoChar((char)0);//显示原本的数据                } else {                    f2.setEchoChar('*');//设置密码的外显为*                    f3.setEchoChar('*');//设置密码的外显为*                }            }        });                f3.setFont(font);                ButtonGroup group = new ButtonGroup();                //创建两个单选按钮                jr1 = new JRadioButton("男");                jr1.setBounds(70, 130, 80, 40);                jr1.setFont(font);                jr2 = new JRadioButton("女");                jr2.setBounds(150, 130, 80, 40);                jr2.setFont(font);                //将两个单选按钮加入到同一个ButtonGroup组中                group.add(jr1);                group.add(jr2);                //实现监听接口                ActionListener listener = new AbstractAction() {                    @Override                    //actionPerformed==>发生动作时调用                    public void actionPerformed(ActionEvent e) {                     }                };                jr1.addActionListener(listener);                jr2.addActionListener(listener);                jc.addActionListener(listener);                jb1 = new JButton("注册");                jb1.setBounds(50, 170, 80, 40);                //匿名内部类                jb1.addMouseListener(new MouseAdapter() {                    public void mouseClicked(MouseEvent e) {                        PreparedStatement ps = null;//PreparedStatement==>表示预编译的SQL语句的对象。                        // SQL语句已预编译并存储在PreparedStatement对象中。                        Connection con = null;//Connection==>与特定数据库的连接                        try {                            //注册驱动                            Class.forName("com.mysql.cj.jdbc.Driver");                            //这里的3306/后跟的是数据库名                            //获取数据库连接                            String url = "jdbc:mysql://localhost:3306/students?serverTimezone=GMT%2B8";                            //通过DriverManager完成注册                            con = DriverManager.getConnection(url, "root", "123");//你自己数据库的用户名和密码                            //执行SQL语句                            String sql = "insert into student(username,password,sex) values(?,?,?)";                            ps = con.prepareStatement(sql);                            if(f1.getText().length()!=0){                                //注：这里的所有getText()都不能写成!=null                                ps.setString(1, f1.getText());                            }else{                                JOptionPane.showMessageDialog(null, "姓名不能为空！");//弹出窗口                            }                            if(f2.getText().length()!=0) {                                ps.setString(2, f2.getText());                            }else{                                JOptionPane.showMessageDialog(null, "密码不能为空！");                            }                            if(jr1.isSelected()||jr2.isSelected()) {//如果选择男或者女，就存入数据库。                                if (jr1.isSelected()) {//isSelected（）==>判断按钮有没有被选中                                    ps.setString(3, jr1.getText());//选中男，则将sex=男添加到数据                                }                                if (jr2.isSelected()) {                                    ps.setString(3, jr2.getText());//选中女，则将sex=女添加到数据                                }                            }else{//否则弹出窗口提醒“请选择性别！”                                JOptionPane.showMessageDialog(null, "请选择性别！");                            }                        } catch (ClassNotFoundException ex) {                            ex.printStackTrace();                        } catch (SQLException ex) {                            ex.printStackTrace();                        }                        if (new String(f2.getPassword()).equals(new String(f3.getPassword()))) {//如果密码与确认密码一致                            if (new String(f2.getPassword()).equals(new String(f3.getPassword()))&&f1.getText().length()!=0&&f2.getText().length()!=0                                    &&(jr1.isSelected()||jr2.isSelected())) {//如果密码与确认密码一致，用户名和密码不为空并且选择了性别，则注册成功                                JOptionPane.showMessageDialog(null, "注册成功！");                                //注册成功后跳转到登录窗口                                guitext3 gt = new guitext3();                                jf.dispose();//关闭窗体，释放所有资源                                try {                                    int i = ps.executeUpdate();//将注册的账户存储到数据库中                                } catch (SQLException ex) {                                    ex.printStackTrace();                                }                            }                        } else {                            JOptionPane.showMessageDialog(null, "注册失败！密码与确认密码不一致！");                            f2.setText(null);//清空密码                            f3.setText(null);//清空确认密码                        }                    }                });                jb1.setFont(font);                jb2 = new JButton("退出");                jb2.setBounds(170, 170, 80, 40);                //匿名内部类                jb2.addMouseListener(new MouseAdapter() {                    public void mouseClicked(MouseEvent e) {                        JOptionPane.showMessageDialog(null, "退出成功！");                        //系统退出                        System.exit(0);                    }                });                jb2.setFont(font);                jf.add(l1);                jf.add(f1);                jf.add(l2);                jf.add(f2);                jf.add(l3);                jf.add(f3);                jf.add(jr1);                jf.add(jr2);                jf.add(jc);                jf.add(jb1);                jf.add(jb2);                // jf.add(jp);                jf.setVisible(true);            }        }

效果展示

登录页面运行结果

注册页面运行结果

是否隐藏密码效果图

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