如何用Jpatchca和Spring MVC实现验证码？这篇文章运用了实例代码展示，代码非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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Jpatchca不支持集群环境，默认的验证码不是保存在session中，如果想做个性化的处理很麻烦。其实我想要的就是一个声称图片的流就ok了，剩下的事情就交给程序员自己实现吧。
最终，选择了patchca（另一个开源的组件）来实现，这个验证码是放到session中的，也可以自己指定。很灵活。
这里对Jpatchca做个备忘：
com.octo.captcha
jcaptcha
2.0-alpha-1
com.octo.captcha
jcaptcha-integration-simple-servlet
2.0-alpha-1
servlet-api
javax.servlet
Lrtech_framework
contextConfigLocation
classpath:framework/spring-front.xml
org.springframework.web.context.ContextLoaderListener
springMVC
org.springframework.web.servlet.DispatcherServlet
contextConfigLocation
classpath:/spring-servlet.xml
1
springMVC
/
encodingFilter
org.springframework.web.filter.CharacterEncodingFilter
encoding
UTF-8
forceEncoding
true
encodingFilter
/*
json=application/json
xml=application/xml
html=text/html
package com.lavasoft.ntv.web.captchea;
import com.octo.captcha.component.p_w_picpath.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.p_w_picpath.backgroundgenerator.UniColorBackgroundGenerator;
import com.octo.captcha.component.p_w_picpath.color.RandomListColorGenerator;
import com.octo.captcha.component.p_w_picpath.deformation.ImageDeformation;
import com.octo.captcha.component.p_w_picpath.deformation.ImageDeformationByFilters;
import com.octo.captcha.component.p_w_picpath.fontgenerator.FontGenerator;
import com.octo.captcha.component.p_w_picpath.fontgenerator.RandomFontGenerator;
import com.octo.captcha.component.p_w_picpath.textpaster.DecoratedRandomTextPaster;
import com.octo.captcha.component.p_w_picpath.textpaster.TextPaster;
import com.octo.captcha.component.p_w_picpath.textpaster.textdecorator.TextDecorator;
import com.octo.captcha.component.p_w_picpath.wordtop_w_picpath.DeformedComposedWordToImage;
import com.octo.captcha.component.p_w_picpath.wordtop_w_picpath.WordToImage;
import com.octo.captcha.component.word.wordgenerator.RandomWordGenerator;
import com.octo.captcha.component.word.wordgenerator.WordGenerator;
import com.octo.captcha.engine.p_w_picpath.ListImageCaptchaEngine;
import com.octo.captcha.p_w_picpath.gimpy.GimpyFactory;
import java.awt.*;
import java.awt.p_w_picpath.ImageFilter;
/**
* 生成验证码引擎实现
*
* @author leizhimin 14-5-4 上午10:55
*/
public class MyCaptchaEngine extends ListImageCaptchaEngine {
protected void buildInitialFactories() {
int minWordLength = 4;
int maxWordLength = 4;
int fontSize = 16;
int p_w_picpathWidth = 120;
int p_w_picpathHeight = 28;
WordGenerator wordGenerator = new RandomWordGenerator("23456789abcdefghjkmnpqrstuvwxyz");
TextPaster randomPaster = new DecoratedRandomTextPaster(minWordLength,
maxWordLength, new RandomListColorGenerator(new Color[]{
new Color(23, 170, 27), new Color(220, 34, 11),
new Color(23, 67, 172)}), new TextDecorator[]{});
BackgroundGenerator background = new UniColorBackgroundGenerator(p_w_picpathWidth, p_w_picpathHeight, Color.white);
FontGenerator font = new RandomFontGenerator(fontSize, fontSize,
new Font[]{new Font("nyala", Font.BOLD, fontSize),
new Font("Bell MT", Font.PLAIN, fontSize),
new Font("Credit valley", Font.BOLD, fontSize)});
ImageDeformation postDef = new ImageDeformationByFilters(new ImageFilter[]{});
ImageDeformation backDef = new ImageDeformationByFilters(new ImageFilter[]{});
ImageDeformation textDef = new ImageDeformationByFilters(new ImageFilter[]{});
WordToImage word2p_w_picpath = new DeformedComposedWordToImage(font,
background, randomPaster, backDef, textDef, postDef);
addFactory(new GimpyFactory(wordGenerator, word2p_w_picpath));
}
}package com.lavasoft.ntv.web;
import com.octo.captcha.service.CaptchaServiceException;
import com.octo.captcha.service.p_w_picpath.ImageCaptchaService;
import com.sun.p_w_picpath.codec.jpeg.JPEGCodec;
import com.sun.p_w_picpath.codec.jpeg.JPEGImageEncoder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.p_w_picpath.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* 登录逻辑
*
* @author leizhimin 14-5-4 上午11:00
*/
@Controller
public class LoginController {
@Resource(name = "p_w_picpathCaptchaService")
private ImageCaptchaService p_w_picpathCaptchaService;
/**
* 生成验证码图片io流
*/
@RequestMapping(value = "/generateImage")
public void ImageCaptcha(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("------------------- /generateImage");
byte[] captchaChallengeAsJpeg = null;
ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
try {
String sessionid = request.getSession().getId();
BufferedImage challenge = p_w_picpathCaptchaService.getImageChallengeForID(sessionid, request.getLocale());
JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(jpegOutputStream);
jpegEncoder.encode(challenge);
} catch (Exception e) {
e.printStackTrace();
}
captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
response.setHeader("Cache-Control", "no-store");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("p_w_picpath/jpeg");
ServletOutputStream responseOutputStream = response.getOutputStream();
responseOutputStream.write(captchaChallengeAsJpeg);
responseOutputStream.flush();
responseOutputStream.close();
}
/**
* 验证验证码，并进行登录
*/
@RequestMapping("/login")
private String LoginAction(HttpServletRequest request,
HttpServletResponse response,
String username,
String password,
String yzm) {
boolean flag = false;
String sessionid = request.getSession().getId();
String captcha_value = request.getParameter("yzm");
System.out.println("反馈的验证码：" + captcha_value);
try {
flag = p_w_picpathCaptchaService.validateResponseForID(sessionid, captcha_value);
} catch (CaptchaServiceException e) {
}
System.out.println("验证结果为:" + flag + ",sessionID=" + sessionid + ",验证码=" + captcha_value);
if (flag) {
//todo:验证用户名和密码逻辑，
}
return flag ? "good" : "error";
}
@RequestMapping("/hello")
private String hello() {
System.out.println("-------hello!------");
return "hello";
}
@RequestMapping("/mp")
private ModelMap mp() {
System.out.println("-------ModelMap!------");
ModelMap map = new ModelMap();
map.put("as", "sadfas");
map.put("as1", "sadfas");
map.put("as2", "sadfas");
return map;
}
@RequestMapping("/mp2")
private ModelAndView mp2() {
System.out.println("-------ModelMap!------");
ModelAndView mv = new ModelAndView();
ModelMap map = mv.getModelMap();
map.put("as1", "sadfas1");
map.put("as2", "sadfas2");
mv.setViewName("mp2");
return mv;
}
}
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上述就是小编为大家分享的用Jpatchca和Spring MVC实现验证码的方法了，如果您也有类似的疑惑，不妨参照上述方法进行尝试。如果想了解更多相关内容，请关注创新互联行业资讯。
文章名称：如何用Jpatchca和SpringMVC实现验证码
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http://cdxtjz.com/article/gesggh.html
