验证码生成无敌版

1.创建一个servlet

package cn.itcast.common;

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

import javax.annotation.Resource;
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.octo.captcha.service.CaptchaServiceException;
import com.octo.captcha.service.image.ImageCaptchaService;
import cn.itcast.common.web.SessionProvider;

/**
 * 提供验证码图片的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();
		responseOutputStream.write(captchaChallengeAsJpeg);
		responseOutputStream.flush();
		responseOutputStream.close();
	}
}

2.创建一个一个xml文件

	
		
		
		
		
	
	
		
			
				
			
		
	

	
		
			
		
		
			
		
	

			
		
		
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			26
		
		
		
			34
		
		
			
				
					Arial
					0
					32
				
			
		
	
	
		
		
			110
		
		
		
			50
		
	

	
		
		
			4
		
		
		
			4
		
		
		
			
		
		
		
			
				
			
		
		
	
		1
		
	
	
		
			
		
	
	
		
			255
		
		
			255
		
		
			255
		
	
	
		
			50
		
		
			50
		
		
			50
		
	

3，在web.xml配置servlet

		captcha
		cn.itcast.common.JcaptchaServlet
	
	
		captcha
		/captcha.svl
	
	

4.创建一个session共享类，用于创建session，获取session和销毁session 并交给spring管理

package cn.itcast.common.web;

import java.io.Serializable;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;


public class HttpSessionProvide implements SessionProvider{

	public void setAttribute(HttpServletRequest request, String name, Serializable value) {
		HttpSession session = request.getSession();
		session.setAttribute(name, value);
		
	}

	public Serializable getAttribute(HttpServletRequest request, String name) {
		HttpSession session = request.getSession(false);
		if (session != null) {
			return(Serializable) session.getAttribute(name);
		}
		return null;
	}

	public void logout(HttpServletRequest request) {
		HttpSession session = request.getSession(false);
		if (session != null) {
			session.invalidate();
		}
	}

	public String getSessionId(HttpServletRequest request) {
		return request.getSession().getId();
	}

}

在spring里面注入

最后获取生成的验证吗图片

换一张

效果图