package?com.liutao.common.captcha;


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

import?javax.imageio.ImageIO;
import?javax.servlet.ServletException;
import?javax.servlet.ServletOutputStream;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;

import?org.springframework.beans.factory.BeanFactoryUtils;
import?org.springframework.web.context.WebApplicationContext;
import?org.springframework.web.context.support.WebApplicationContextUtils;


import?com.liutao.common.web.session.SessionProvider;
import?com.octo.captcha.service.CaptchaServiceException;
import?com.octo.captcha.service.image.ImageCaptchaService;

/**
?*?提供驗證碼圖片的Servlet
?*/
@SuppressWarnings（“serial“）
public?class?JcaptchaServlet?extends?HttpServlet?{
	public?static?final?String?CAPTCHA_IMAGE_FORMAT?=?“jpeg“;

	private?ImageCaptchaService?captchaService;
	private?SessionProvider?session;

	@Override
	public?void?init（）?throws?ServletException?{
		WebApplicationContext?appCtx?=?WebApplicationContextUtils
				.getWebApplicationContext（getServletContext（））;
		captchaService?=?（ImageCaptchaService）?BeanFactoryUtils
				.beanOfTypeIncludingAncestors（appCtx?ImageCaptchaService.class）;
		session?=?（SessionProvider）?BeanFactoryUtils
				.beanOfTypeIncludingAncestors（appCtx?SessionProvider.class）;
	}

	@Override
	protected?void?doGet（HttpServletRequest?request
			HttpServletResponse?response）?throws?ServletException?IOException?{
		byte[]?captchaChallengeAsJpeg?=?null;
		//?the?output?stream?to?render?the?captcha?image?as?jpeg?into
		ByteArrayOutputStream?jpegOutputStream?=?new?ByteArrayOutputStream（）;
		try?{
			//?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?=?session.getSessionId（request）;
			BufferedImage?challenge?=?captchaService.getImageChallengeForID（
					captchaId?request.getLocale（））;
			//?Jimi.putImage（“image/jpeg“?challenge?jpegOutputStream）;
			ImageIO.write（challenge?CAPTCHA_IMAGE_FORMAT?jpegOutputStream）;
		}?catch?（IllegalArgumentException?e）?{
			response.sendError（HttpServletResponse.SC_NOT_FOUND）;
			return;
		}?catch?（CaptchaServiceException?e）?{
			response.sendError（HttpServletResponse.SC_INTERNAL_SERVER_ERROR）;
			return;
		}
		//?catch?（JimiException?e）?{
		//?response.sendError（HttpServletResponse.SC_INTERNAL_SERVER_ERROR）;
		//?return;
		//?}

		captchaChallengeAsJpeg?=?jpegOutputStream.toByteArray（）;

		//?flush?it?in?the?response
		response.setHeader（“Cache-Control“?“no-store“）;
		response.setHeader（“Pragma“?“no-cache“）;
		response.setDateHeader（“Expires“?0）;
		response.setContentType（“image/“?+?CAPTCHA_IMAGE_FORMAT）;

		ServletOutputStream?responseOutputStream?=?response.getOutputStream（）;
		responseOutpu

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-12-09?13:47??驗證碼\
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法一\
?????文件???????31109??2014-10-30?10:58??驗證碼\方法一\ValidateCode.jar
?????文件??????????76??2017-06-03?11:59??驗證碼\方法一\使用.txt
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\
?????文件????????4430??2017-06-04?11:21??驗證碼\方法三\captcha.xml
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\com\
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\com\liutao\
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\com\liutao\common\
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\com\liutao\common\captcha\
?????文件????????3129??2017-06-04?10:30??驗證碼\方法三\com\liutao\common\captcha\JcaptchaServlet.java
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\com\liutao\common\web\
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法三\com\liutao\common\web\session\
?????文件????????1106??2017-06-02?11:56??驗證碼\方法三\com\liutao\common\web\session\HttpSessionProvider.java
?????文件?????????639??2017-06-02?09:41??驗證碼\方法三\com\liutao\common\web\session\SessionProvider.java
?????文件??????349875??2017-06-04?11:17??驗證碼\方法三\jcaptcha-1.0-all.jar
?????文件??????330732??2017-06-04?11:34??驗證碼\方法三\jcaptcha-1.0-all.src.zip
?????文件??????330411??2017-06-04?12:07??驗證碼\方法三\jcaptcha-1.0-all.zip
?????文件?????????932??2017-06-04?11:23??驗證碼\方法三\說明.txt
?????目錄???????????0??2017-12-09?13:47??驗證碼\方法二\
?????文件????????2475??2017-06-03?11:36??驗證碼\方法二\image.jsp
?????文件?????????157??2017-10-13?21:53??驗證碼\方法二\注意.txt