java仿Servlet生成验证码实例详解

java仿Servlet生成验证码实例详解

java仿Servlet生成验证码实例详解

实现原理：使用BufferedImage对象的Graphics来进行绘制，然后输出成一张图片进行保存

实现代码及详解:

public class validateCode{

private static Random rand = new Random();

public static void main(String[] args){

int val1 = rand.nextInt(9);

int val2 = rand.nextInt(9);

int val3 = rand.nextInt(9);

int val4 = rand.nextInt(9);

String val = val1 + " " + val2 + " " + val3 + " " + val4'

BufferedImage buf = drawImage(val);

//将最终的图片保存到D：//cheng.png下

ImageIO.write(buf,"png",new File("D://cheng.png");

}

public static BufferedImage drawImage(String code){

int height = 30;

int width = 60;

BufferedImage buf = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

Graphics2D gs = buf.createGraphics();

gs.setBackground(Color.black);

gs.drawRect(0,0,width,height);

//绘制随机干扰线

int total = 100;

drawRandLine(gs,total);

//绘制验证码

Font font = new Font("行楷",Font.BOLD,20);

gs.setFont(font);

gs.setColor(getRandColor(155,255));

gs.drawString(code,5,20);

return buf;

}

public static void drawRandLine(Graphics2D gs,int total){

for(int i=0; i

int x1 = rand.nextInt(width);

int x2 = rand.nextInt(width);

int y1 = rand.nextInt(height);

int y2 = rand.nextInt(height);

//设置随机颜色

gs.setColor(getRandColor(0,155));

gs.drawLine(x1,y1,x2,y2);

}

}

public static Color getRandColor(int from,int to){

int r = from + rand.nextInt(to-from);

int g = from + rand.nextInt(to-from);

int b = from + rand.nextInt(to-from);

return new Color(r,g,b);

}

最终实现效果图

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

int x1 = rand.nextInt(width);

int x2 = rand.nextInt(width);

int y1 = rand.nextInt(height);

int y2 = rand.nextInt(height);

//设置随机颜色

gs.setColor(getRandColor(0,155));

gs.drawLine(x1,y1,x2,y2);

}

}

public static Color getRandColor(int from,int to){

int r = from + rand.nextInt(to-from);

int g = from + rand.nextInt(to-from);

int b = from + rand.nextInt(to-from);

return new Color(r,g,b);

}

最终实现效果图

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

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