Java Swing实现登陆窗口验证码
Java Swing实现如图窗口界面，点击右侧【看不清，换一张】可更换验证码。
Code.java
package com.A;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
import javax.swing.border.Border;
public class Code extends JFrame {
public class RoundBorder implements Border {
public Insets getBorderInsets(Component c) {
return new Insets(0,0,0,0);
}
public boolean isBorderOpaque() {
return false;
}
//绘制圆角按钮
public void paintBorder(Component c, Graphics g, int x, int y,
int width, int height) {
//使用黑色在组件的外边缘绘制一个圆角矩形
g.setColor(Color.BLACK);
g.drawRoundRect(0, 0, c.getWidth()-1, c.getHeight()-1, 12, 12);
}
}
public void CreateJFrame() {
//界面背景图片
ImageIcon icon=new ImageIcon("src//images//background.jpg");
//Image im=new Image(icon);
//将图片放入label中
JLabel label=new JLabel(icon);
//设置label的大小
label.setBounds(0,0,icon.getIconWidth(),icon.getIconHeight());
//窗口名称
JFrame jf = new JFrame("用户登陆");
jf.getLayeredPane().add(label,new Integer(Integer.MIN_VALUE));
JPanel j=(JPanel)jf.getContentPane();
j.setOpaque(false);
JPanel panel=new JPanel();
panel.setOpaque(false);
placeComponents(panel);
jf.add(panel);
jf.setVisible(true);
jf.setSize(icon.getIconWidth(),icon.getIconHeight());
jf.setResizable(false);
//在屏幕中设置显示的位置
jf.setLocation(700,500);
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
//设置窗口内各种组件
public void placeComponents(JPanel panel) {
panel.setLayout(null);
JLabel label1 = new JLabel("用户名");
Font zi=new Font("黑体",Font.TYPE1_FONT,20);
label1.setFont(zi);
label1.setBounds(155, 179, 70, 40);
panel.add(label1);
JTextField text1 = new JTextField(20);
text1.setBounds(240,187,175,30);
//监听，当鼠标点击按钮会变色
text1.addMouseListener(new MouseListener () {
private Border oldBorder;
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
// 保存旧边框
oldBorder = text1.getBorder();
// 设置一个新边框
text1.setBorder(BorderFactory.createLineBorder(new Color(0,128,255)));
}
@Override
public void mouseExited(MouseEvent e) {
// 还原旧边框
text1.setBorder(oldBorder);
}
});
panel.add(text1);
JLabel label2 = new JLabel("密码");
Font zi1=new Font("黑体",Font.TYPE1_FONT,20);
label2.setFont(zi1);
label2.setBounds(155, 237, 70, 40);
panel.add(label2);
JTextField text2 = new JTextField(20);
text2.setBounds(240,242,175,30);
text2.addMouseListener(new MouseListener () {
private Border oldBorder;
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
// 保存旧边框
oldBorder = text2.getBorder();
// 设置一个新边框
text2.setBorder(BorderFactory.createLineBorder(new Color(0,128,255)));
}
@Override
public void mouseExited(MouseEvent e) {
// 还原旧边框
text2.setBorder(oldBorder);
}
});
panel.add(text2);
JLabel label3 = new JLabel("验证码");
Font zi2=new Font("黑体",Font.TYPE1_FONT,20);
label3.setFont(zi2);
label3.setBounds(155, 290, 70, 40);
panel.add(label3);
JTextField text3 = new JTextField(20);
text3.setBounds(240,295,175,30);
text3.addMouseListener(new MouseListener () {
private Border oldBorder;
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
// 保存旧边框
oldBorder = text3.getBorder();
// 设置一个新边框
text3.setBorder(BorderFactory.createLineBorder(new Color(0,128,255)));
}
@Override
public void mouseExited(MouseEvent e) {
// 还原旧边框
text3.setBorder(oldBorder);
}
});
panel.add(text3);
//设置单选按钮
JRadioButton rb1=new JRadioButton("教师");
ButtonGroup group=new ButtonGroup();
Font zi3=new Font("黑体",Font.TYPE1_FONT,16);
rb1.setFont(zi3);
group.add(rb1);
rb1.setSelected(true);
rb1.setBounds(180, 360, 60, 25);
rb1.setBackground(new Color(204,204,255));
panel.add(rb1);
//设置单选按钮
JRadioButton rb2=new JRadioButton("学生");
rb2.setFont(zi3);
group.add(rb2);
rb2.setSelected(true);
rb2.setBounds(280, 360, 60, 25);
rb2.setBackground(new Color(204,204,255));
panel.add(rb2);
//设置单选按钮
JRadioButton rb3=new JRadioButton("访客");
rb3.setFont(zi3);
group.add(rb3);
rb3.setSelected(true);
rb3.setBounds(380, 360, 60, 25);
rb3.setBackground(new Color(204,204,255));
panel.add(rb3);
JButton button1 = new JButton("登陆");
button1.setFont(zi3);
button1.setForeground(new Color(0,0,0));
button1.setBounds(220, 400, 60, 30);
button1.setBorder(new RoundBorder());
panel.add(button1);
JButton button2 = new JButton("重置");
button2.setFont(zi3);
button2.setForeground(new Color(0,0,0));
button2.setBounds(340, 400, 60, 30);
button2.setBorder(new RoundBorder());
panel.add(button2);
JLabel code = new JLabel();
Object[] obj = CodePicture.createImage();
ImageIcon img = new ImageIcon((BufferedImage)obj[1]);//创建图片对象
code.setIcon((Icon)img);
code.setBounds(450, 290,150, 50);
panel.add(code);
String strMsg1 = "看不清";
String strMsg2 = "换一张";
String strMsg = ""+strMsg1+"
"+strMsg2+"";
JLabel change = new JLabel(strMsg);
//监听，鼠标进入文字就变成小手形状
change.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent e) //鼠标进入
{
change.setForeground(Color.blue);
change.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent e) //鼠标移除
{
change.setForeground(Color.black);
setCursor(Cursor.getDefaultCursor());
}
});
change.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e){
if(e.getClickCount() == 1){
//重新获取验证码
Object[] obj1 = CodePicture.createImage();
ImageIcon img1 = new ImageIcon((BufferedImage)obj1[1]);//创建图片对象
code.setIcon((Icon)img1);
code.setBounds(450, 290,150, 50);
panel.add(code);
}
}
});
change.setBounds(550,290,100,40);
panel.add(change);
}
public static void main(String[] args) {
new Code().CreateJFrame();
}
}
CodePicture.java
package com.A;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;
//绘制验证码
public class CodePicture {
// 验证码字符集
private static final char[] chars = (“0123456789abcdefghijklmnopqrstuvwxyz”
+ “ABCDEFGHIJKLMNOPQRSTUVWXYZ”).toCharArray();
// 字符数量
private static final int SIZE = 4;
// 干扰线数量
private static final int LINES = 10;
// 宽度
private static final int WIDTH = 80;
// 高度
private static final int HEIGHT = 40;
// 字体大小
private static final int FONT_SIZE = 30;//30
/**
* 生成随机验证码及图片
*/
public static Object[] createImage() {
StringBuffer sb = new StringBuffer();
// 1.创建空白图片
BufferedImage image = new BufferedImage(
WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
// 2.获取图片画笔
Graphics graphic = image.getGraphics();
// 3.设置画笔颜色
graphic.setColor(Color.LIGHT_GRAY);
// 4.绘制矩形背景
graphic.fillRect(0, 0, WIDTH, HEIGHT);
// 5.画随机字符
Random ran = new Random();
for (int i = 0; i }
附背景图片：
