java小白——验证码窗体的实现

柔光的暖阳◎ 2023-06-17 05:59 29阅读 0赞

package gui.awt;
    
    import java.awt.Color;
    import java.awt.Font;
    import java.awt.Frame;
    import java.awt.Graphics;
    import java.awt.Panel;
    import java.util.Random;
    
    public class Text9 {
        
    
    	public static void main(String[] args) {
        
    		final Frame f = new Frame("验证码");
    		final Panel panel = new MyPanel();
    		f.add(panel);
    		f.setSize(300,200);
    		f.setLocationRelativeTo(null);//将Frame窗口居中
    		f.setVisible(true);
    		
    
    	}
    
    }
    class MyPanel extends Panel{
        
    	public void paint(Graphics g){
        
    		int width = 160;
    		int height = 40;
    		g.setColor(Color.LIGHT_GRAY);//设置上下文颜色
    		g.fillRect(0, 0, width, height);//填充验证码背景
    		g.setColor(Color.BLACK);//设置上下文颜色
    		g.drawRect(0, 0, width-1, height-1);//绘制边框
    		Random random =new Random();
    		for(int i=0;i<100;i++){
        //绘制干扰点
    			int x = random.nextInt(width)-2;
    			int y = random.nextInt(height)-2;
    			g.drawOval(x, y,2,2);
    		}
    		g.setFont(new Font("黑体",Font.BOLD,30));//设置验证码字体
    		g.setColor(Color.BLUE);//设置验证码颜色
    		char[] c =  ("0123456789abcdefghijkmnopqrstuvwxyzABCDEFG"
    				+ "HIJKLMNPQRSTUVWXYZ").toCharArray();//产生随机验证码
    		StringBuilder sb = new StringBuilder();
    		for(int i=0;i<4;i++){
        
    			int pos = random.nextInt(c.length);
    			char c1 = c[pos];
    			sb.append(c1+" ");
    		}
    		g.drawString(sb.toString(), 20, 30);//写入验证码
    	}
    }

**实现**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE3NDIwOA_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE3NDIwOA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191127201539730.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE3NDIwOA==,size_16,color_FFFFFF,t_70