本文实例为大家分享了Swing实现可动态刷新的验证码的具体代码,供大家参考,具体内容如下
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import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.JFrame;
public class CheckCode extends JFrame {
private static Random random = new Random();
private int width = 53 ; //验证码宽度
private int height = 25 ; //验证码高度
private int font_size = 20 ; //验证码颜色
private int x = 100 ; //验证码所在窗体X坐标
private int y = 100 ; //验证码所在窗体Y坐标
private int jam = 5 ; //干扰元素 建议使用 4~7 之间的数字
private String code = "" ; //保存验证码
public CheckCode(){ //初始化窗体信息
super ( "验证码" );
setVisible( true );
setBounds((Toolkit.getDefaultToolkit().getScreenSize().width- 300 )/ 2 , (Toolkit.getDefaultToolkit().getScreenSize().height- 300 )/ 2 , 300 , 200 );
setDefaultCloseOperation(EXIT_ON_CLOSE);
addMouseListener( new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
repaint();
}
});
}
public Color getRandomColor(){ //获得随机颜色
int R=random.nextInt( 255 ),G=random.nextInt( 255 ),B=random.nextInt( 255 );
return new Color(R,G,B);
}
public String getRandomString(){ //获得验证码
int num = random.nextInt( 9 );
code = num+ "" ;
return num+ "" ;
}
public void checkCode(Graphics g){ // 绘画验证码
drawBorder(g);
drawCode(g);
drawJam(g);
}
public void drawBorder(Graphics g){ //绘画边框和背景
Color gc = g.getColor();
g.setColor(Color.WHITE);
g.fillRect(x, y, width, height);
g.setColor(Color.BLACK);
g.drawRect(x, y, width, height);
g.setColor(gc);
}
public void drawCode(Graphics g){ //绘画验证码内容
Color gc = g.getColor();
for ( int i= 0 ;i< 4 ;i++){
g.setColor(getRandomColor());
g.setFont( new Font( "宋体" ,Font.BOLD,font_size));
g.drawString(getRandomString(), x+ 5 +(i* 12 ), y+font_size);
}
g.setColor(gc);
}
public void drawJam(Graphics g){ //绘画干扰元素
Color gc = g.getColor();
for ( int i= 0 ;i<jam;i++){
g.setColor(getRandomColor());
g.drawLine(x+random.nextInt(width), y+random.nextInt(height), x+random.nextInt(width), y+random.nextInt(height));
}
g.setColor(gc);
}
public void paint(Graphics g) {
Color c = g.getColor();
g.drawString( "单击可刷新验证码" , 30 , 50 );
checkCode(g);
g.setColor(c);
}
public static void main(String[] args) {
new CheckCode();
}
}
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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服务器之家。