稍微修改了下jfinal官方demo的代码，用了下验证码
效果图：
CommonController.java
package com.demo.common;
import com.jfinal.core.Controller;
import com.jfinal.lib.captcha.CaptchaRender;
/**
* CommonController
*/
public class CommonController extends Controller {
private static final String RANDOM_CODE_KEY = "1";
public void index() {
render("/common/login.jsp");
}
public void login() {
String inputRandomCode = getPara("inputRandomCode");
boolean loginSuccess = CaptchaRender.validate(this, inputRandomCode, RANDOM_CODE_KEY);
if (loginSuccess) {
render("/common/index.jsp");
}else{
index();
}
}
public void img() {
CaptchaRender img = new CaptchaRender(RANDOM_CODE_KEY);
render(img);
}
}login.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xml:lang="zh-CN" xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<link href="/css/manage.css" media="screen" rel="stylesheet"
type="text/css" />
<script src="/js/jquery-1.4.4.min.js" type="text/javascript"></script>
</head>
<body>
<div class="manage_container">
<div class="manage_head">
<div class="manage_logo">
<a href="http://code.google.com/p/jfinal" target="_blank">JFinal
web framework</a>
</div>
<div id="nav">
<ul>
</ul>
</div>
</div>
<div class="main">
<h1>JFinal Demo 项目首页</h1>
<div class="table_box">
<form action="login" method="post">
<img src="img" alt="" />
<input name="inputRandomCode"/>
<input type="submit" value="登录"/>
</form>
</div>
</div>
</div>
</body>
</html>
