利用kaptcha实现验证码(SpringMVC实现)

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1.首先需要导入jar包

2.配置spring的配置文件applicationContext.xml

<bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
<property name="config">
<bean class="com.google.code.kaptcha.util.Config">
<constructor-arg>
<props>
<prop key="kaptcha.border">yes</prop>
<prop key="kaptcha.border.color">105,179,90</prop>
<prop key="kaptcha.textproducer.font.color">blue</prop>
<prop key="kaptcha.image.width">120</prop>
<prop key="kaptcha.image.height">40</prop>
<prop key="kaptcha.textproducer.font.size">40</prop>
<prop key="kaptcha.session.key">code</prop>
<prop key="kaptcha.textproducer.char.length">4</prop>
<prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
</props>
</constructor-arg>
</bean>
</property>

</bean>

其中,验证码相关的属性如下,可以自己进行设置

kaptcha.border 是否有边框默认为true 我们可以自己设置yes，no
kaptcha.border.color 边框颜色默认为Color.BLACK
kaptcha.border.thickness 边框粗细度默认为1
kaptcha.producer.impl 验证码生成器默认为DefaultKaptcha
kaptcha.textproducer.impl 验证码文本生成器默认为DefaultTextCreator
kaptcha.textproducer.char.string 验证码文本字符内容范围默认为abcde2345678gfynmnpwx
kaptcha.textproducer.char.length 验证码文本字符长度默认为5
kaptcha.textproducer.font.names 验证码文本字体样式默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)
kaptcha.textproducer.font.size 验证码文本字符大小默认为40
kaptcha.textproducer.font.color 验证码文本字符颜色默认为Color.BLACK
kaptcha.textproducer.char.space 验证码文本字符间距默认为2
kaptcha.noise.impl 验证码噪点生成对象默认为DefaultNoise
kaptcha.noise.color 验证码噪点颜色默认为Color.BLACK
kaptcha.obscurificator.impl 验证码样式引擎默认为WaterRipple
kaptcha.word.impl 验证码文本字符渲染默认为DefaultWordRenderer
kaptcha.background.impl 验证码背景生成器默认为DefaultBackground
kaptcha.background.clear.from 验证码背景颜色渐进默认为Color.LIGHT_GRAY
kaptcha.background.clear.to 验证码背景颜色渐进默认为Color.WHITE
kaptcha.image.width 验证码图片宽度默认为200
kaptcha.image.height 验证码图片高度默认为50

3.创建生成验证码的controller,代码如下

package com.book.controller;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.portlet.ModelAndView;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

@Controller
@RequestMapping("/code")
public class CaptchaController {
//从spring容器中取值
private ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
Producer captchaProducer = (Producer)ctx.getBean("captchaProducer");

@RequestMapping(value = "/captcha-image")
public ModelAndView getKaptchaImage(HttpServletRequest request,HttpServletResponse response) throws IOException{
HttpSession session = request.getSession();
String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
System.out.println("产生的验证码是:"+code);
//相关参数的设置
response.setDateHeader("Expires",0);
response.setHeader("Cache-Control","no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
String capText = captchaProducer.createText();
session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

BufferedImage bi = captchaProducer.createImage(capText);
ServletOutputStream out = response.getOutputStream();
ImageIO.write(bi, "jpg", out);
try {
out.flush();
} finally{
out.close();
}
return null;
}
}

4.登录界面的相关代码

5.在用户登录的controller中取值校验可以使用如下代码

//获取生成的验证码
String code = (String) request.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);

6.相关jar包的下载地址

http://pan.baidu.com/s/1bICWpC

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