利用servlet生成简单的验证码

最新推荐文章于 2022-10-31 10:15:07 发布

转载最新推荐文章于 2022-10-31 10:15:07 发布 · 784 阅读

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#servlet #random #image #class #service #url

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本文介绍如何使用Servlet技术生成随机验证码图片，并在JSP页面上显示。包括配置web.xml、编写Servlet源代码及在JSP中调用的方法。

关键字: servlet 验证码

在web.xml配置:

代码

<servlet>
    <servlet-name>image</servlet-name>
    <servlet-class>org.test.web.AuthImage</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>image</servlet-name>
<url-pattern>/authImage</url-pattern>
</servlet-mapping>

其servlet源代码:

代码

public class AuthImage extends HttpServlet
{

    private static final String CONTENT_TYPE = "text/html; charset=gb2312";
    //设置字母的大小,大小
    private Font mFont = new Font("Times New Roman", Font.PLAIN, 17);
    public void init() throws ServletException
    {
        super.init();
    }
    Color getRandColor(int fc,int bc)
    {
        Random random = new Random();
        if(fc>255) fc=255;
        if(bc>255) bc=255;
        int r=fc+random.nextInt(bc-fc);
        int g=fc+random.nextInt(bc-fc);
        int b=fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
    }

    public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.setHeader("Pragma","No-cache");
        response.setHeader("Cache-Control","no-cache");
        response.setDateHeader("Expires", 0);
        //表明生成的响应是图片
        response.setContentType("image/jpeg");

        int width=100, height=18;
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics g = image.getGraphics();
        Random random = new Random();
        g.setColor(getRandColor(200,250));
        g.fillRect(1, 1, width-1, height-1);
        g.setColor(new Color(102,102,102));
        g.drawRect(0, 0, width-1, height-1);
        g.setFont(mFont);

        g.setColor(getRandColor(160,200));

        //画随机线
        for (int i=0;i<155;i++)
        {
            int x = random.nextInt(width - 1);
            int y = random.nextInt(height - 1);
            int xl = random.nextInt(6) + 1;
            int yl = random.nextInt(12) + 1;
            g.drawLine(x,y,x + xl,y + yl);
        }

        //从另一方向画随机线
        for (int i = 0;i < 70;i++)
        {
            int x = random.nextInt(width - 1);
            int y = random.nextInt(height - 1);
            int xl = random.nextInt(12) + 1;
            int yl = random.nextInt(6) + 1;
            g.drawLine(x,y,x - xl,y - yl);
        }

        //生成随机数,并将随机数字转换为字母
        String sRand="";
        for (int i=0;i<6;i++)
        {
            int itmp = random.nextInt(26) + 65;
            char ctmp = (char)itmp;
            sRand += String.valueOf(ctmp);
            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
            g.drawString(String.valueOf(ctmp),15*i+10,16);
        }

        HttpSession session = request.getSession(true);
        session.setAttribute("rand",sRand);
        g.dispose();
        ImageIO.write(image, "JPEG", response.getOutputStream());
    }
    public void destroy()
    {
    }
}

怎样用:
在页面显示随机图片,可在JSP页面中增加如下代码即可:

代码