验证码例子（kaptcha插件的使用）

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验证码 kaptcha

使用kaptcha插件实现验证码小例子（顺便加了spring MVC），而且用到了JQuery

项目目录结构：

pom.xml 文件中引进的包都是spring MVC 的。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.royal</groupId>
  <artifactId>verifyCode_kaptcha</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>verifyCode_kaptcha</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
     <!-- 需要用到的jar -->
    <dependency>
		<groupId>commons-logging</groupId>
		<artifactId>commons-logging</artifactId>
		<version>1.1.1</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-aop</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-asm</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-aspects</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-beans</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context-support</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-core</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-expression</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-instrument</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-jdbc</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-jms</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-orm</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-oxm</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-test</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-tx</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-web</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency> 
		<groupId>org.springframework</groupId>
		<artifactId>spring-webmvc</artifactId>
		<version>3.1.0.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-webmvc-portlet</artifactId>
		<version>3.1.0.RELEASE</version>  
	</dependency>
	<dependency>
		<groupId>org.apache.tomcat</groupId>
		<artifactId>jsp-api</artifactId>
		<version>6.0.35</version>  
	</dependency>
  </dependencies>
</project>

真正需要的验证码插件包只有kaptcha-2.3.jar；可是用pom.xml加载不下来，我不想用build Path--->add external...的方法，我想直接拷贝jar到/lib文件夹下，不知道在maven项目中怎么做.... 希望知道的大牛能够教教我！

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	
    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    
    <servlet>
        <servlet-name>Kaptcha</servlet-name>
        <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
	</servlet>
	
    <!-- MVC不过滤以下文件 -->
    <servlet-mapping>  
        <servlet-name>default</servlet-name>  
        <url-pattern>*.css</url-pattern>  
    </servlet-mapping>  
    <servlet-mapping>  
        <servlet-name>default</servlet-name>  
        <url-pattern>*.gif</url-pattern>  
    </servlet-mapping>  
    <servlet-mapping>  
        <servlet-name>default</servlet-name>  
        <url-pattern>*.jpg</url-pattern>  
    </servlet-mapping>  
    <servlet-mapping>  
        <servlet-name>default</servlet-name>  
        <url-pattern>*.js</url-pattern>  
    </servlet-mapping>  
	
    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    
	<servlet-mapping>
        <servlet-name>Kaptcha</servlet-name>
        <url-pattern>/kaptcha.jpg</url-pattern>
	</servlet-mapping>
	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
</web-app>

spring-mvc.xml

<beans xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd" >
        
    <context:component-scan base-package="com.royal.controller"/>
    
    <bean name="/verifyKaptcha" class="com.royal.controller.VerifyKaptchaController" />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    
</beans>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>verifyCode_kaptcha</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script type="text/javascript" charset="utf-8" src="js/jquery-1.7.1.js"></script>
	
	<script type="text/javascript">
		$(function(){
			$('#kaptchaImage').click(function () {
	    		$(this).attr('src', 'kaptcha.jpg?' + Math.floor(Math.random()*100) );
			})
		});	
	</script>

  </head>
  
  <body>
    <form action="<%=basePath%>verifyKaptcha">
    	<input type="text" name="kaptcha" value="" />
   	 	<img src="kaptcha.jpg" width="200" id="kaptchaImage" />
		<br />
		<input type="submit" value="提交" />
	</form>
  </body>
</html>

控制类

VerifyKaptchaController.java

package com.royal.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class VerifyKaptchaController extends AbstractController{

	@Override
	protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
		String kaptchaExpected = (String)request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
		System.out.println(kaptchaExpected);
		String kaptchaReceived = request.getParameter("kaptcha");
		System.out.println(kaptchaReceived);
		//如果验证码错误
		if (kaptchaReceived == null || !kaptchaReceived.equalsIgnoreCase(kaptchaExpected)){
			System.out.println("验证码错误");
		}else{
			return new ModelAndView("success");
		}
		return null;
	}

}

文件差不多了。注意maven build.