JavaSwing仿QQ登录界面，注释完善，适合新手学习

使用说明：

1. 这是一个java做的仿制QQ登录界面，界面仅使用一个类，
2. JDK版本为jdk-11
3. 素材包的名字为：素材（下载）请在项目中新建一个名字为“素材”的文件夹。
4. 素材: https://pan.baidu.com/s/1XoXlU4ITi621GLEkuDkSAA 提取码: 1234
5. 适合新手学习java Swing使用，如有任何运行问题，请联系QQ：1585889713 我尽量秒回
6. 注释很完善，句句都写的明明白白的。

package 第十章.view;

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;
import 第十一章.界面类.Table;//此界面为java的jdbc做的增删改和模糊查，数据库MySQL，需要的联系我QQ：1585889713

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("素材//1.gif"));
jan = new JLabel(new ImageIcon("素材//最小化.png"));
bi = new JLabel(new ImageIcon("素材//关闭.png"));
QQ = new JLabel(new ImageIcon("素材//qq.png"));
qq = new JLabel("QQ");
an1 = new JLabel();an2 = new JLabel();//暗调
tu = new JLabel(new ImageIcon("素材//头像.png"));
user = new JTextField();
pass = new JPasswordField();
su1 = new JLabel(new ImageIcon("素材//qq (1).png"));
mi1 = new JLabel(new ImageIcon("素材//密码.png"));
lie1 = new JLabel(new ImageIcon("素材//直线2.png"));
lie2 = new JLabel(new ImageIcon("素材//直线2.png"));
bgcolor = new JPanel();
ku1 = new JLabel(new ImageIcon("素材//框框.png"));
ku2 = new JLabel(new ImageIcon("素材//框框.png"));
gou1 = new JLabel(new ImageIcon("素材//对勾.png"));
gou2 = new JLabel(new ImageIcon("素材//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("素材//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
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));//框内文字样式
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);

this.addMouseMotionListener(new MouseMotionListener() {//窗体拖动事件
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("素材//qq (1).png"));
lie1.setIcon(new javax.swing.ImageIcon("素材//直线2.png"));
c=0;
if(user.getText().isEmpty()) {//判断是否为空（为了设置默认提示语）
user.setForeground(Color.gray);
user.setText("QQ号码/手机/邮箱");
}
}

public void focusGained(FocusEvent e) {//得到焦点
user.setForeground(Color.black);
lie1.setIcon(new javax.swing.ImageIcon("素材//直线3.png"));
a=1;c=1;b=0;
su1.setIcon(new javax.swing.ImageIcon("素材//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() {

public void focusLost(FocusEvent e) {//失去焦点
lie2.setIcon(new javax.swing.ImageIcon("素材//直线2.png"));//失去焦点换图片
mi1.setIcon(new javax.swing.ImageIcon("素材//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("素材//密码 (1).png"));
lie2.setIcon(new javax.swing.ImageIcon("素材//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("素材\\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();

}

public void mouseClicked(MouseEvent e) {//点击不恢复
}

public void mousePressed(MouseEvent e) {//点击后
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("向家康")&&password.equals("666666")) {
//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：向家康，密码：666666，您并未设置打开界面！");
new Login();
}

}
}

public void mouseReleased(MouseEvent e) {//点击时
if(e.getSource()==submit||e.getSource()==text5) {
text5.setFont(new Font("微软雅黑", 0, 15));
}
}

public void mouseEntered(MouseEvent e) {//悬停
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("素材//直线4.png"));
}
}else if(e.getSource()==pass) {
if(b==0&&d==0) {
lie2.setIcon(new javax.swing.ImageIcon("素材//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("素材//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("素材//直线2.png"));
}
}else if(e.getSource()==pass) {
if(b==0) {
lie2.setIcon(new javax.swing.ImageIcon("素材//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("素材//二维码.png"));
}

}

}

//登录界面背景是 动态的！欢迎大家来挑刺。。。最好是来学习，哈哈哈。