本文实例为大家分享了Java swing 仿QQ账号密码输入框，供大家参考，具体内容如下

主要思路是自己定义 AccountPanel 和 PasswordPanel 类，继承JPanel，通过 paintComponent(Graphics g) 方法重绘面板，实现目标样式。

先上效果图

正常显示效果:

鼠标放在控件上时的效果:

腾讯QQ登录界面的账号密码输入部分效果比对:

下面直接给出代码吧

AccountPanel:

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import javax.swing.JPanel;

public class AccountPanel extends JPanel{

private static final long serialVersionUID = 1L;

private Color normalc=Color.LIGHT_GRAY;

private Color borderc=Color.LIGHT_GRAY;

private boolean flag=false;

public AccountPanel(){}

public AccountPanel(Color normalc,Color borderc){

this.normalc=normalc;

this.borderc=borderc;

}

public void setBorder(boolean flag){

this.flag=flag;

}

@Override

public void paintComponent(Graphics g){

super.paintComponent(g);

Graphics2D g2=(Graphics2D) g;

//设置绘图质量

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);

//画一个顶部两个角为圆角，底部两个角为直角的矩形

g2.setColor(Color.white);

g2.fillRoundRect(0, 0, 190, 30, 10, 10);

g2.fillRect(0, 10, 190, 17);

//为该矩形添加边框

if(flag){

g2.setStroke(new BasicStroke(2.0f));

g2.setColor(borderc);

g2.drawArc(1, 1, 10, 10, 180, -90);//绘制圆弧

g2.drawLine(5, 1, 185, 1);

g2.drawArc(179, 1, 10, 10, 90, -90);//绘制圆弧

g2.drawLine(1, 5, 1, 29);

g2.drawLine(189, 5, 189, 29);

g2.drawLine(1, 29, 190, 29);

}

else{

g2.setStroke(new BasicStroke(1.0f));

g2.setColor(normalc);

g2.drawArc(0, 0, 10, 10, 180, -90);//绘制圆弧

g2.drawLine(5, 0, 185, 0);

g2.drawArc(179, 0, 10, 10, 90, -90);//绘制圆弧

g2.drawLine(0, 5, 0, 30);

g2.drawLine(189, 5, 189, 30);

g2.drawLine(0, 30, 190, 30);

}

}

}

PasswordPanel:

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import javax.swing.JPanel;

public class PasswordPanel extends JPanel{

private static final long serialVersionUID = 1L;

private Color normalc=Color.LIGHT_GRAY;

private Color borderc=Color.LIGHT_GRAY;

private boolean flag=false;

public PasswordPanel(){}

public PasswordPanel(Color normalc,Color borderc){

this.normalc=normalc;

this.borderc=borderc;

}

public void setBorder(boolean flag){

this.flag=flag;

}

@Override

public void paintComponent(Graphics g){

super.paintComponent(g);

Graphics2D g2=(Graphics2D) g;

//设置绘图质量

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);

//画一个顶部两个角为圆角，底部两个角为直角的矩形

g2.setColor(Color.white);

g2.fillRoundRect(0, 0, 190, 30, 10, 10);

g2.fillRect(0, 0, 190, 17);

//为该矩形添加边框

//为该矩形添加边框

if(flag){

g2.setStroke(new BasicStroke(2.0f));

g2.setColor(borderc);

g2.drawLine(1, 1, 1, 25);

g2.drawLine(189, 1, 189, 25);

g2.drawLine(1, 1, 190, 1);

g2.drawArc(1, 18, 10, 10, 180, 90);//绘制圆弧

g2.drawArc(179, 18, 10, 10, 270, 90);//绘制圆弧

g2.drawLine(5, 29, 185, 29);

}

else{

g2.setStroke(new BasicStroke(1.0f));

g2.setColor(normalc);

g2.drawLine(0, 0, 0, 25);

g2.drawLine(189, 0, 189, 25);

g2.drawLine(0, 0, 190, 0);

g2.drawArc(0, 18, 10, 10, 180, 90);//绘制圆弧

g2.drawArc(179, 18, 10, 10, 270, 90);//绘制圆弧

g2.drawLine(5, 29, 185, 29);

}

}

}

下面的代码就是主窗体了

Demo1:

import java.awt.Color;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class Demo1 {

public static void main(String[] args) {

//初始化窗体

JFrame frame=new JFrame("My QQ");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(300, 200);

frame.setLocationRelativeTo(null);

frame.setLayout(null);

//添加账号面板

AccountPanel accountPanel=new AccountPanel(Color.LIGHT_GRAY,new Color(56,172,239));

accountPanel.setLayout(null);

accountPanel.setBounds(30, 15, 190, 30);

frame.add( accountPanel);

//在账号面板中添加文本框

JTextField accountTF=new JTextField();

accountTF.setBounds(7, 0, 153, 30);

accountTF.setOpaque(false);

accountTF.setBorder(null);

accountPanel.add(accountTF);

//在账号面板中的文本框后添加按钮

JButton jb1=new JButton(new ImageIcon(

Demo1.class.getClassLoader().getResource("res/images/btn1.png")));

jb1.setBounds(160, 0, 30, 30);

jb1.setBorder(null);//取消边框

jb1.setBorderPainted(false);//不绘制按钮边框

jb1.setContentAreaFilled(false);//设置按钮背景透明

jb1.setFocusPainted(false);//设置按钮不绘制焦点状态

accountPanel.add(jb1);

//密码面板

PasswordPanel passwordPanel=new PasswordPanel(Color.LIGHT_GRAY,new Color(56,172,239));

passwordPanel.setLayout(null);

passwordPanel.setBounds(30, 45, 190, 30);

frame.add( passwordPanel);

//输入密码文本框

JPasswordField passwordPF=new JPasswordField();

passwordPF.setBounds(7, 0, 153, 30);

passwordPF.setOpaque(false);

passwordPF.setBorder(null);

passwordPanel.add(passwordPF);

//在账号面板中的文本框后添加按钮

JButton jb2=new JButton(new ImageIcon(

Demo1.class.getClassLoader().getResource("res/images/btn2.png")));

jb2.setBounds(160, 0, 30, 30);

jb2.setBorder(null);

jb2.setBorderPainted(false);

jb2.setContentAreaFilled(false);

jb2.setFocusPainted(false);

passwordPanel.add(jb2);

//为账号输入框添加鼠标监听器

MouseAdapter accountListener=new MouseAdapter(){

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

accountPanel.setBorder(true);

accountPanel.updateUI();

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

accountPanel.setBorder(false);

accountPanel.updateUI();

}

};

accountTF.addMouseListener(accountListener);

jb1.addMouseListener(accountListener);

//为密码输入框添加鼠标监听器

MouseAdapter passwordListener=new MouseAdapter(){

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

passwordPanel.setBorder(true);

passwordPanel.updateUI();

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

passwordPanel.setBorder(false);

passwordPanel.updateUI();

}

};

passwordPF.addMouseListener(passwordListener);

jb2.addMouseListener(passwordListener);

frame.setVisible(true);

}

}

自此，仿QQ登录账号密码输入框就完成了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。