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扬中网站建设案例,亚马逊书店购书官网,做seo必须有网站吗,医疗手机网站【案例11-3】 模拟QQ登录 【案例介绍】 1.案例描述 QQ是现实生活中常用的聊天工具#xff0c;QQ登录界面看似小巧、简单#xff0c;但其中涉及的内容却很多#xff0c;对于初学者练习Java Swing工具的使用非常合适。本案例要求使用所学的Java Swing知识#xff0c;模拟实…【案例11-3】 模拟QQ登录 【案例介绍】 1.案例描述 QQ是现实生活中常用的聊天工具QQ登录界面看似小巧、简单但其中涉及的内容却很多对于初学者练习Java Swing工具的使用非常合适。本案例要求使用所学的Java Swing知识模拟实现一个QQ登录界面。 2.运行结果 运行结果 【案例分析】 1首先需要定义一些成员变量如最小化、关闭、账号、密码、头像等方便响应的逻辑实现。 2由于需要对账号、密码、头像等进行布局故需要先对这些对象进行实例化。 3在对需要用到的文本框、图片等对象进行实例化过后可以使用对象.setBounds()设置文本框、图片等组件的位置。 4接下来对最小化、关闭、账号、密码、头像等添加监听事件。同时对窗体也添加窗体拖动监听事件。 5最后为最小化、关闭等编写点击时的执行逻辑。为账号、密码等设置点击、悬停等执行逻辑。 【案例实现】 Login.java package chapter1103;import java.awt.Color;    import java.awt.Cursor;    import java.awt.Font;    import java.awt.Point;    import java.awt.Toolkit;    import java.awt.event.FocusEvent;    import java.awt.event.FocusListener;    import java.awt.event.MouseEvent;    import java.awt.event.MouseListener;import java.awt.event.MouseMotionListener;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JPasswordField;import javax.swing.JTextField;public class Login extends JFrame implements MouseListener {    JLabel bacgrangd, jan,bi,QQ,qq,tu;//gif,最小化,关闭,logo,QQ,头像    JLabel an1, an2, lie1, lie2;// 暗色块|线    JTextField user;// 账号    JPasswordField pass;// 密码    JPanel bgcolor;// 白    JLabel su1, mi1, ku1, ku2, gou1, gou2;// 缩略图    JLabel text1, text2, text3, text4, text5;//自动登录,记住密码,找回//密码,注册账号,登录    static Point origin new Point();// 变量用于可拖动窗体    int a 0, b 0, c 0, d 0;// 控制线    int f 0, g 0, h 0, j 0;// 控制√    JLabel submit, ma;// 背景    public Login() {        //实例化        bacgrangd new JLabel(new ImageIcon(images/1.gif));        jan new JLabel(new ImageIcon(images/最小化.png));        bi new JLabel(new ImageIcon(images/关闭.png));        QQ new JLabel(new ImageIcon(imagesqq.png));        qq new JLabel(QQ);        an1 new JLabel();        an2 new JLabel();// 暗调        tu new JLabel(new ImageIcon(images/头像.png));        user new JTextField();        pass new JPasswordField();        su1 new JLabel(new ImageIcon(images/qq (1).png));        mi1 new JLabel(new ImageIcon(images/密码.png));        lie1 new JLabel(new ImageIcon(images/直线2.png));        lie2 new JLabel(new ImageIcon(images/直线2.png));        bgcolor new JPanel();        ku1 new JLabel(new ImageIcon(images/框框.png));        ku2 new JLabel(new ImageIcon(images/框框.png));        gou1 new JLabel(new ImageIcon(images/对勾.png));        gou2 new JLabel(new ImageIcon(images/对勾.png));        text1 new JLabel(自动登录);        text2 new JLabel(记住密码);        text3 new JLabel(找回密码);        text4 new JLabel(注册账号);        text5 new JLabel(登录);        submit new JLabel();        ma new JLabel(new ImageIcon(images/二维码.png));        //位置        bacgrangd.setBounds(-35, -123, 500, 250);        jan.setBounds(364, 2, 32, 32);        bi.setBounds(396, 3, 32, 32);        QQ.setBounds(10, 10, 32, 32);        qq.setBounds(50, 5, 45, 45);        an1.setBounds(361, 0, 35, 35);        an2.setBounds(395, 0, 35, 35);        tu.setBounds(170, 80, 90, 85);        user.setBounds(130, 160, 180, 40);        pass.setBounds(130, 200, 180, 40);        su1.setBounds(100, 170, 20, 20);        mi1.setBounds(100, 210, 20, 20);        lie1.setBounds(100, 190, 240, 10);        lie2.setBounds(100, 230, 240, 10);        bgcolor.setBounds(0, 125, 500, 300);        ku1.setBounds(100, 250, 20, 20);        ku2.setBounds(190, 250, 20, 20);        gou1.setBounds(106, 255, 10, 10);        gou2.setBounds(196, 255, 10, 10);        text1.setBounds(125, 250, 80, 20);        text2.setBounds(215, 250, 80, 20);        text3.setBounds(288, 250, 80, 20);        text4.setBounds(15, 300, 80, 20);        text5.setBounds(206, 285, 80, 20);        submit.setBounds(100, 280, 242, 35);        ma.setBounds(385, 290, 30, 30);        //属性        qq.setFont(new Font(微软雅黑, 1, 25));        qq.setForeground(Color.white);        an1.setBackground(new Color(0, 0, 0, 0.3f));        an2.setBackground(new Color(0, 0, 0, 0.3f));        bgcolor.setBackground(new Color(255, 255, 255));        user.setForeground(Color.gray);        user.setText(QQ号码/手机/邮箱);        user.setOpaque(false);// 透明背景        user.setBorder(null);// 去掉边框         // 框内文字样式        user.setFont(new Font(微软雅黑, Font.PLAIN, 16));          // 框内文字样式        pass.setFont(new Font(微软雅黑, Font.PLAIN, 16));         pass.setBorder(null);// 去掉边框        pass.setOpaque(false);// 透明背景        pass.setForeground(Color.gray);        pass.setText(密码);        pass.setEchoChar((char) 0);// 让密码显示出来        text1.setFont(new Font(微软雅黑, 0, 12));        text2.setFont(new Font(微软雅黑, 0, 12));        text3.setFont(new Font(微软雅黑, 0, 12));        text4.setFont(new Font(微软雅黑, 0, 12));        text5.setFont(new Font(微软雅黑, 0, 15));        text1.setForeground(new Color(170, 170, 170));        text2.setForeground(new Color(170, 170, 170));        text3.setForeground(new Color(170, 170, 170));        text4.setForeground(new Color(170, 170, 170));        text5.setForeground(Color.white);        gou1.setVisible(false);        gou2.setVisible(false);        submit.setBackground(new Color(5, 186, 251));        submit.setOpaque(true);     text3.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));     text4.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));        //事件区域        jan.addMouseListener(this);        bi.addMouseListener(this);        user.addMouseListener(this);        pass.addMouseListener(this);        text1.addMouseListener(this);        text2.addMouseListener(this);        text3.addMouseListener(this);        text4.addMouseListener(this);        ku1.addMouseListener(this);        ku2.addMouseListener(this);        submit.addMouseListener(this);        ma.addMouseListener(this);        this.addMouseListener(this);         // 窗体拖动事件 this.addMouseMotionListener(new MouseMotionListener() {            public void mouseMoved(MouseEvent e) {        }    public void mouseDragged(MouseEvent e) {       Point p getLocation();        setLocation(p.x e.getX()-origin.x, p.y e.getY()-origin.y);    }});user.addFocusListener(new FocusListener() {     public void focusLost(FocusEvent e) {// 失去焦点         su1.setIcon(new javax.swing.ImageIcon(images/qq (1).png));         lie1.setIcon(new javax.swing.ImageIcon(images/直线2.png));             c 0;              // 判断是否为空为了设置默认提示语             if (user.getText().isEmpty()) {                   user.setForeground(Color.gray);                   user.setText(QQ号码/手机/邮箱);               }           }        // 得到焦点       public void focusGained(FocusEvent e) {          user.setForeground(Color.black);         lie1.setIcon(new javax.swing.ImageIcon(images/直线3.png));               a 1;               c 1;               b 0;          su1.setIcon(new javax.swing.ImageIcon(images/qq(2).png));               if (user.getText().equals(QQ号码/手机/邮箱)) {                   user.setText();               } else {                   user.setText(user.getText());                   user.selectAll();               }           }        });        pass.addFocusListener(new FocusListener() {            // 失去焦点           public void focusLost(FocusEvent e) {             // 失去焦点换图片           lie2.setIcon(new javax.swing.ImageIcon(images/直2.png));            mi1.setIcon(new javax.swing.ImageIcon(images/密码.png));               d 0;               if (pass.getText().isEmpty()) {                   pass.setForeground(Color.gray);                   pass.setText(密码);                   pass.setEchoChar((char) 0);// 让密码显示出来               }           }        public void focusGained(FocusEvent e) {// 得到焦点               mi1.setIcon(new javax.swing.ImageIcon(images/密码                   (1).png));               lie2.setIcon(new javax.swing.ImageIcon(images/直线                  3.png));               b 1;               a 0;               d 1;               pass.setForeground(Color.black);               pass.setEchoChar(*);// 让用户输入看不见               if (pass.getText().equals(密码)) {                   pass.setText();               } else {                   pass.setText(pass.getText());               }           }        });        this.setLayout(null);// 布局        this.add(jan);        this.add(bi);        this.add(qq);        this.add(QQ);        this.add(an1);        this.add(an2);        this.add(tu);        this.add(lie1);        this.add(lie2);        this.add(user);        this.add(pass);        this.add(su1);        this.add(mi1);        this.add(gou1);        this.add(gou2);        this.add(ku1);        this.add(ku2);        this.add(text1);        this.add(text2);        this.add(text3);        this.add(text4);        this.add(text5);        this.add(submit);        this.add(ma);        this.add(bgcolor);        this.add(bacgrangd);        this.setSize(430, 330);this.setIconImage(Toolkit.getDefaultToolkit().createImage(images    /透明照片.png));// 窗体图标        this.setLocationRelativeTo(null);// 保持居中        this.setUndecorated(true);// 去顶部        this.setFocusable(true);// 面板首先获得焦点        this.setBackground(new Color(255, 255, 255));// 背景颜色        this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);        this.setAlwaysOnTop(true);// 最顶层        this.setVisible(true);// 显示    }    public static void main(String[] args) {        new Login();    }    // 点击不恢复    public void mouseClicked(MouseEvent e) {     }    // 点击后    public void mousePressed(MouseEvent e) {         if (e.getSource() jan) {           setExtendedState(JFrame.ICONIFIED);        } else if (e.getSource() this) {           origin.x e.getX();           origin.y e.getY();        } else if (e.getSource() bi) {           System.exit(0);        } else if (e.getSource() ku1 || e.getSource() text1) {           if (f 0) {               gou1.setVisible(true);               g 1;               f 1;           } else if (g 1) {               gou1.setVisible(false);               f 0;               g 0;           }        } else if (e.getSource() ku2 || e.getSource() text2) {           if (h 0) {               gou2.setVisible(true);               j 1;               h 1;           } else if (j 1) {               gou2.setVisible(false);               h 0;               j 0;            }      } else if (e.getSource() submit || e.getSource() text5) {           text5.setFont(new Font(微软雅黑, 0, 14));           dispose();           String users user.getText();           String password pass.getText();           if (users.equals(itcast) password.equals(123)) {           //new Table();//打开新的主界面如果要关闭登录界面可以写dispose();           } else {           JOptionPane.showMessageDialog(null, 用户名itcast密                   码123您并未设置打开界面);               new Login();           }        }    }     // 点击时    public void mouseReleased(MouseEvent e) {         if (e.getSource() submit || e.getSource() text5) {           text5.setFont(new Font(微软雅黑, 0, 15));        }    }     // 悬停    public void mouseEntered(MouseEvent e) {         if (e.getSource() jan) {           an1.setOpaque(true);        } else if (e.getSource() bi) {           an2.setOpaque(true);        } else if (e.getSource() user) {           if (a 0 c 0) {         lie1.setIcon(new javax.swing.ImageIcon(images/直线4.png));           }        } else if (e.getSource() pass) {           if (b 0 d 0) {         lie2.setIcon(new javax.swing.ImageIcon(images/直线4.png));           }        } else if (e.getSource() text3) {           text3.setForeground(Color.GRAY);        } else if (e.getSource() text4) {           text4.setForeground(Color.GRAY);        } else if (e.getSource() ma) {          ma.setIcon(new javax.swing.ImageIcon(images/二维码2.png));        }    }    public void mouseExited(MouseEvent e) {// 悬停后        if (e.getSource() jan) {           an1.setOpaque(false);        } else if (e.getSource() bi) {           an2.setOpaque(false);        } else if (e.getSource() user) {           if (a 0) {         lie1.setIcon(new javax.swing.ImageIcon(images/直线2.png));           }        } else if (e.getSource() pass) {           if (b 0) {         lie2.setIcon(new javax.swing.ImageIcon(images/直线2.png));           }        } else if (e.getSource() text3) {           text3.setForeground(new Color(170, 170, 170));        } else if (e.getSource() text4) {           text4.setForeground(new Color(170, 170, 170));        } else if (e.getSource() ma) {           ma.setIcon(new javax.swing.ImageIcon(images/二码.png));        }    }} 上述代码中第19-30行代码定义了一些成员变量方便响应的逻辑实现。第33-58行代码对一些图片对象进行实例化。第60-85行设置图片、文本框等的位置。第87-120行设置各个文本框文字等的样式。第122-134行为各个文本框、按钮等设置监听事件。第136-143行为窗体拖动事件设置窗体监听。第144-170为账号文本框设置鼠标聚焦事件。第171-200为密码文本框设置鼠标聚焦事件。第201-227行将各个按钮图片文本框对象放入容器内。第228-238对界面进行布局。mouseClicked()方法中编写了按钮文本框文字等点击不回复的逻辑。mousePressed()方法中编写了按钮文本框文字等点击后的逻辑。mouseReleased()方法中编写了按钮文本框文字等点击时的逻辑。mouseEntered()方法中编写了按钮文本框文字等悬停时的逻辑。mouseExited()方法中编写了按钮文本框文字等悬停后的逻辑。