图片验证码切换
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <link href="<c:url value=‘/css/style.css‘/>" rel="stylesheet" type="text/css"/> <script type="text/javascript"> //地址获取 function getRootPath() var rootPath=window.location.pathname; // /Day517/Ajax.jsp var index = rootPath.indexOf("/",1); rootPath = rootPath.substring(0,index); return rootPath; // /Day517 </script> </head> <body> <!-- 必须使用post提交 --> <span class="red">$msg </span> <form action="<c:url value=‘/login.do‘/>" method="post"> <input type="text" name="username"/> <br/> <input type="text" name="password"/> <br/> <input type="text" name="verifycode"/> <br/> <img alt="看不清，换一张" src="<c:url value=‘/verifycode.do‘/>" id="imgcheck" onclick="this.src=getRootPath()+‘/verifycode.do?‘+Math.random()"/><br/> <input type="submit" value="ok"/> <br/> </form> </body> </html>
@Controller public class VerifyCodeController @RequestMapping("/verifycode.do") public void doverifycode(HttpServletRequest request,HttpServletResponse response) throws IOException VerifyCode vc =new VerifyCode(); BufferedImage image = vc.getImage(); String text = vc.getText(); request.getSession().setAttribute("session_verifycode", text); VerifyCode.output(image, response.getOutputStream());
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