Swing绘制一个4位的验证码

最新推荐文章于 2023-08-07 18:06:53 发布

happymff

最新推荐文章于 2023-08-07 18:06:53 发布

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分类专栏： java

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public void  paint(Graphics g){
    int width = 160;
    int height = 40;
    g.setColor(Color.LIGHT_GRAY);
    g.fillRect(0,0,width,height);
    g.setColor(Color.BLACK);
    g.drawRect(0,0,width-1,height-1);
    Random r = new Random();
    for (int i =0 ;i<100;i++){
        int x = r.nextInt(width)-2;
        int y = r.nextInt(height)-2;
        g.drawOval(x,y,2,2);
    }
    g.setFont(new Font("黑体",Font.BOLD,30));
    g.setColor(Color.BLUE);
    char[] chars = ("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
    StringBuilder sb= new StringBuilder();
    for(int i =0; i < 4; i ++){
        int pos =r.nextInt(chars.length);
        char c = chars[pos];
        sb.append(c+" ");
    }
    g.drawString(sb.toString(),20,30);
}