验证码例子（jcaptcha插件的使用）

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jcaptcha 验证码

和上一篇验证码的例子（kaptcha插件的使用）类似，同样加进了spring mvc、jquery

项目目录结构：

pom.xml

<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_jcaptcha</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>verifyCode_jcaptcha</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>com.octo.captcha</groupId>
      <artifactId>jcaptcha-all</artifactId>
      <version>1.0-RC6</version>
    </dependency>
    
     <!-- spring mvc -->
     <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>

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>jcaptcha</servlet-name>
        <servlet-class>com.royal.servlet.ImageCaptchaServlet</servlet-class>
        <load-on-startup>0</load-on-startup>
    </servlet>
    
    <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>
    
    <!-- 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>jcaptcha</servlet-name>
	        <url-pattern>/jcaptcha</url-pattern>
	</servlet-mapping>
	
	<servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</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="/verifyJcaptcha" class="com.royal.controller.VerifyJcaptchaController" />

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

CaptchaServiceSingleton.java

package com.royal.verifyCode_jcaptcha;

import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;

/**
 * 实例一个jcaptcha服务，注意，必须是单例模式
 */
public class CaptchaServiceSingleton {
	
	private static ImageCaptchaService instance = new DefaultManageableImageCaptchaService();
	
	public static ImageCaptchaService getInstance(){
		return instance;
	}

}

ImageCaptchaServlet.java

package com.royal.servlet;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.royal.verifyCode_jcaptcha.CaptchaServiceSingleton;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
 * 一个产生图片的servlet
 */
public class ImageCaptchaServlet extends HttpServlet{

	private static final long serialVersionUID = 1L;

	@Override
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		byte[] captchaChallengeAsJpeg = null;
		//the output stream to render the captcha image as jpeg into
		ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
		//get the session id that will identify the generated captcha.the same id must be used to validate the response, the session id is a good candidate!
		String captchaId = req.getSession().getId();
		//call the ImageCaptchaService getChallenge method
		BufferedImage challenge = CaptchaServiceSingleton.getInstance().getImageChallengeForID(captchaId, req.getLocale());
		//a jpeg encoder
		JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(jpegOutputStream);
		jpegEncoder.encode(challenge);
		
		captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
		
		// flush it in the response
		resp.setHeader("Cache-Control", "no-store");
		resp.setHeader("Pragma", "no-cache");
		resp.setDateHeader("Expires", 0);
		resp.setContentType("image/jpeg");
		
		ServletOutputStream responseOutputStream = resp.getOutputStream();
		responseOutputStream.write(captchaChallengeAsJpeg);
		responseOutputStream.flush();
        responseOutputStream.close();
	}
	
}

也就是当你点击图片进行刷新的时候，访问的就是这个servlet（用于生成验证码图片）

这里可能有个小问题:

当你要用 JPEGImageEncoder 和 JPEGCodec，你会发现无法导入rt.jar里面的 com.sun.image.codec.jpeg.JPEGCodec

com.sun.image.codec.jpeg.JPEGImageEncoder

这两个类

解决办法：deprecated and restricted API--- Forbidden 选项改为warning

参考：http://blog.csdn.net/oney139/article/details/6539624

mvc 控制类

VerifyJcaptchaController.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;

import com.royal.verifyCode_jcaptcha.CaptchaServiceSingleton;


public class VerifyJcaptchaController extends AbstractController{

	@Override
	protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
		Boolean isResponseCorrect = Boolean.FALSE;
		//remenber that we need an id to validate!
		String captchaId = request.getSession().getId();
		System.out.println("captchaId---" + captchaId);
		
		 //retrieve the response
		String resp = request.getParameter("j_captcha_response");
		System.out.println("j_captcha_response---" + resp);
		
		// Call the Service method
		isResponseCorrect = CaptchaServiceSingleton.getInstance().validateResponseForID(captchaId, resp);
		System.out.println("isResponseCorrect---" + isResponseCorrect);
		
		if(isResponseCorrect == true){
			return new ModelAndView("success");
		}else{
			System.out.println("FAIL..");
			return null;
		}
	}

}

同样别忘了maven build...