这篇文章主要为大家详细介绍了java实现网页验证码功能，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了java网页验证码的实现代码，供大家参考，具体内容如下
Servlet:
package cn.bdqn.servlet; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.annotation.WebSe<a style="color:transparent">来源gao($daima.com搞@代@#码网</a>rvlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.awt.*; import java.awt.font.ImageGraphicAttribute; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; @WebServlet(name = "Servlet",urlPatterns = "/yanCode") public class Servlet extends HttpServlet { public void doPost(javax.servlet.http.HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request,response); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String s="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Random random = new Random(); int width=500; int height=50; BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics graphics = image.getGraphics();//相当于画笔 //画背景 graphics.setColor(Color.gray); graphics.fillRect(0,0,width,height); graphics.setColor(Color.black); for (int i = 0; i <4 ; i++) { int index string c=s.substring(index, + 1); graphics.drawstring(c,width 5*(i+1),15); } imageio.write(image,"jpg",response.getoutputstream()); <pre></div><p>jsp:<br /></p><div class="gaodaimacode"><pre class="prettyprint linenums"> <title>验证码</title>
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转载请注明原文链接：java实现网页验证码功能
转载请注明原文链接：java实现网页验证码功能
