java实现网页验证码功能

2023-09-23 12:25:06 457

packagecn.bdqn.servlet; importjavax.imageio.ImageIO; importjavax.servlet.ServletException; importjavax.servlet.annotation.WebServlet; importjavax.servlet.http.HttpServlet; importjavax.servlet.http.HttpServletRequest; importjavax.servlet.http.HttpServletResponse; importjava.awt.*; importjava.awt.font.ImageGraphicAttribute; importjava.awt.image.BufferedImage; importjava.io.IOException; importjava.util.Random; @WebServlet(name="Servlet",urlPatterns="/http://dh.wk163.comyanCode") publicclassServletextendsHttpServlet{ publicvoiddoPost(javax.servlet.http.HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ this.doGet(request,response); } publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{ Strings="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Randomrandom=newRandom(); intwidth=500; intheight=50; BufferedImageimage=newBufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphicsgraphics=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(inti=0;i<4;i++){ intindex=random.nextInt(s.length()); Stringc=s.substring(index,index+1); graphics.drawString(c,width/5*(i+1),15); } ImageIO.write(image,"jpg",response.getOutputStream()); } }

<%-- CreatedbyIntelliJIDEA. User:Administrator Date:2017/10/10 Time:13:04 TochangethistemplateuseFile|Settings|FileTemplates. --%> <%@pagecontentType="text/html;charset=UTF-8"language="java"%> 验证码 functionchangeCode(){ $("img").attr('src','http://dh.wk163.comyanCode?ts='+newDate().getTime()); }

java实现网页验证码功能

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