KAPTCHA验证码使用步骤

使用kaptcha可以方便的配置：

 

· 验证码的字体

· 验证码字体的大小

· 验证码字体的字体颜色

· 验证码内容的范围(数字，字母，中文汉字！)

· 验证码图片的大小，边框，边框粗细，边框颜色

· 验证码的干扰线(可以自己继承com.google.code.kaptcha.NoiseProducer写一个自定义的干扰线)

· 验证码的样式(鱼眼样式、3D、普通模糊……当然也可以继承com.google.code.kaptcha.GimpyEngine自定义样式)

……

详细信息请看下面的web.xml文件

下面介绍一下用法:

1.首先去官网下载jar:http://code.google.com/p/kaptcha/

2.建立一个web项目，导入kaptcha-2.3.jar到环境变量中。

3.配置web.xml文件

 

<!-- Kaptcha验证码配置 -->
  <servlet>
        <servlet-name>Kaptcha</servlet-name>
        <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
        <init-param>  
            <param-name>kaptcha.border</param-name>  
            <param-value>no</param-value>  
        </init-param>  
        <init-param>  
            <param-name>kaptcha.border.color</param-name>  
            <param-value>105,179,90</param-value>  
        </init-param>       
        <init-param>  
            <param-name>kaptcha.textproducer.font.color</param-name>  
            <param-value>red</param-value>  
        </init-param>  
        <init-param>  
            <param-name>kaptcha.obscurificator.impl</param-name>  
            <param-value>com.google.code.kaptcha.impl.FishEyeGimpy</param-value>  
        </init-param>
        <init-param>  
            <param-name>kaptcha.image.width</param-name>  
            <param-value>250</param-value>  
        </init-param>  
        <init-param>  
            <param-name>kaptcha.image.height</param-name>  
            <param-value>90</param-value>  
        </init-param>  
        <init-param>  
            <param-name>kaptcha.textproducer.font.size</param-name>  
            <param-value>70</param-value>  
        </init-param>  
        <init-param>  
          <!-- String kaptchaExpected = (String) session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);  
                     必须改成
                    String kaptchaExpected = (String) session.getAttribute("code"); -->
            <param-name>kaptcha.session.key</param-name>  
            <param-value>code</param-value>
        </init-param>  
        <init-param>  
            <param-name>kaptcha.textproducer.char.length</param-name>  
            <param-value>4</param-value>  
        </init-param>  
        <init-param>
            <param-name>kaptcha.textproducer.font.names</param-name>  
            <param-value>宋体,楷体,微软雅黑</param-value>  
        </init-param>
</servlet>
<servlet-mapping>
        <servlet-name>Kaptcha</servlet-name>
        <url-pattern>/kaptcha</url-pattern>
</servlet-mapping>

 

4. jsp 页面使用

 

<form class="m-t" role="form"  id="loginform" method="post" action="">
                <div class="form-group"><input class="form-control"  name="userAccount" placeholder="用户名" required=""></div>
                <div class="form-group"><input type="password" class="form-control"   name="userPwd"  placeholder="密码" required=""></div>
                <input type="text" class="form-control login-yan-w" id="kaptcha" name="kaptcha" placeholder="验证码">
                 <span class="login-w"><img id="kaptchaImage" src="kaptcha"></span>
                <input type="button"  class="btn btn-primary block full-width m-b" onclick="login()"  value="登 录">
            </form>
function login(){
        $.ajax({
            cache: true,
            type: "POST",
            url:'${pageContext.request.contextPath}/login',
            data:$('#loginform').serialize(),
            dataType:'json',
            success: function(data) {
                if(data.status==200){
                    url="<%=request.getContextPath()%>/index.jsp";
                    window.location.href=url;               
                }else{
                    alert(data.msg)
                }
            },
            error: function(){                 
                alert("请检查用户账户或密码");
            }
        });
        }

 

5. 如果想设置点击图片更换验证码，可以加上如下js

<script type="text/javascript">
    //点击图片验证码进行更新
    $(function(){
        $('#kaptchaImage').click(function () { $(this).attr('src', 'kaptcha?' + Math.floor(Math.random()*100) ); })
    });
</script>

5. KaptchaServlet会把验证码设置到session中，在Controller可以如下方式获取

 

@RequestMapping("/login")
@ResponseBody
public CRMResult  login(HttpServletRequest request ,HttpSession session) {
    String kaptcha = request.getParameter("kaptcha");
    String kaptchaExpected = (String) session.getAttribute("code");
    System.out.println(kaptcha +"......"+kaptchaExpected);
    if (!kaptcha.equalsIgnoreCase(kaptchaExpected)) {
        return CRMResult.build(201, "验证码填写错误");
    }
    return CRMResult.ok();
}

上面的配置在普通jsp环境下面是有效的，如果在spring mvc环境下，则取不到session值，对于sping mvc环境验证码配置如下：

不用在web.xml进行相关配置，在springmvc.xml中配置

 

<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">no</prop>  
                        <prop key="kaptcha.border.color">105,179,90</prop>  
                        <prop key="kaptcha.textproducer.font.color">red</prop>  
                        <prop key="kaptcha.image.width">250</prop>  
                        <prop key="kaptcha.textproducer.font.size">90</prop>  
                        <prop key="kaptcha.image.height">90</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>  

 

 

 

 

 

使用kaptcha可以方便的配置：

 

· 验证码的字体

· 验证码字体的大小

· 验证码字体的字体颜色

· 验证码内容的范围(数字，字母，中文汉字！)

· 验证码图片的大小，边框，边框粗细，边框颜色

· 验证码的干扰线(可以自己继承com.google.code.kaptcha.NoiseProducer写一个自定义的干扰线)

· 验证码的样式(鱼眼样式、3D、普通模糊……当然也可以继承com.google.code.kaptcha.GimpyEngine自定义样式)

……

详细信息请看下面的web.xml文件

下面介绍一下用法:

1.首先去官网下载jar:http://code.google.com/p/kaptcha/

2.建立一个web项目，导入kaptcha-2.3.jar到环境变量中。

3.配置web.xml文件

<!-- Kaptcha验证码配置 -->

  <servlet>

        <servlet-name>Kaptcha</servlet-name>

        <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>

        <init-param>  

            <param-name>kaptcha.border</param-name>  

            <param-value>no</param-value>  

        </init-param>  

        <init-param>  

            <param-name>kaptcha.border.color</param-name>  

            <param-value>105,179,90</param-value>  

        </init-param>       

        <init-param>  

            <param-name>kaptcha.textproducer.font.color</param-name>  

            <param-value>red</param-value>  

        </init-param>  

        <init-param>  

            <param-name>kaptcha.obscurificator.impl</param-name>  

            <param-value>com.google.code.kaptcha.impl.FishEyeGimpy</param-value>  

        </init-param>

        <init-param>  

            <param-name>kaptcha.image.width</param-name>  

            <param-value>250</param-value>  

        </init-param>  

        <init-param>  

            <param-name>kaptcha.image.height</param-name>  

            <param-value>90</param-value>  

        </init-param>  

        <init-param>  

            <param-name>kaptcha.textproducer.font.size</param-name>  

            <param-value>70</param-value>  

        </init-param>  

        <init-param>  

          <!-- String kaptchaExpected = (String) session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);  

             必须改成

            String kaptchaExpected = (String) session.getAttribute("code"); -->

            <param-name>kaptcha.session.key</param-name>  

            <param-value>code</param-value>

        </init-param>  

        <init-param>  

            <param-name>kaptcha.textproducer.char.length</param-name>  

            <param-value>4</param-value>  

        </init-param>  

        <init-param>

            <param-name>kaptcha.textproducer.font.names</param-name>  

            <param-value>宋体,楷体,微软雅黑</param-value>  

        </init-param>

</servlet>

<servlet-mapping>

        <servlet-name>Kaptcha</servlet-name>

        <url-pattern>/kaptcha</url-pattern>

</servlet-mapping>

4. jsp 页面使用

<form class="m-t" role="form"  id="loginform" method="post" action="">

                <div class="form-group"><input class="form-control"  name="userAccount" placeholder="用户名" required=""></div>

                <div class="form-group"><input type="password" class="form-control"   name="userPwd"  placeholder="密码" required=""></div>

                <input type="text" class="form-control login-yan-w" id="kaptcha" name="kaptcha" placeholder="验证码">

 <span class="login-w"><img id="kaptchaImage" src="kaptcha"></span>

<input type="button"  class="btn btn-primary block full-width m-b" onclick="login()"  value="登 录">

            </form>

function login(){

$.ajax({

        cache: true,

        type: "POST",

        url:'${pageContext.request.contextPath}/login',

        data:$('#loginform').serialize(),

    dataType:'json',

        success: function(data) {

        if(data.status==200){

        url="<%=request.getContextPath()%>/index.jsp";

        window.location.href=url;       

        }else{

        alert(data.msg)

        }

        },

        error: function(){         

        alert("请检查用户账户或密码");

        }

    });

}

5. 如果想设置点击图片更换验证码，可以加上如下js

<script type="text/javascript">

    //点击图片验证码进行更新

    $(function(){

        $('#kaptchaImage').click(function () { $(this).attr('src', 'kaptcha?' + Math.floor(Math.random()*100) ); })

    });

</script>

5. KaptchaServlet会把验证码设置到session中，在Controller可以如下方式获取

@RequestMapping("/login")

@ResponseBody

public CRMResult  login(HttpServletRequest request ,HttpSession session) {

String kaptcha = request.getParameter("kaptcha");

String kaptchaExpected = (String) session.getAttribute("code");

System.out.println(kaptcha +"......"+kaptchaExpected);

if (!kaptcha.equalsIgnoreCase(kaptchaExpected)) {

return CRMResult.build(201, "验证码填写错误");

}

return CRMResult.ok();

}

以上已亲测成功

上面的配置在普通jsp环境下面是有效的，如果在spring mvc环境下，则取不到session值，对于sping mvc环境验证码配置如下：

１.不用在web.xml进行相关配置，在springmvc.xml中配置

Java代码  

<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">no</prop>  

                        <prop key="kaptcha.border.color">105,179,90</prop>  

                        <prop key="kaptcha.textproducer.font.color">red</prop>  

                        <prop key="kaptcha.image.width">250</prop>  

                        <prop key="kaptcha.textproducer.font.size">90</prop>  

                        <prop key="kaptcha.image.height">90</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>  

新建生成图片控制类

Java代码  

import java.awt.image.BufferedImage;  

import javax.imageio.ImageIO;  

import javax.servlet.ServletOutputStream;  

import javax.servlet.http.HttpServletRequest;  

import javax.servlet.http.HttpServletResponse;  

import org.springframework.beans.factory.annotation.Autowired;  

import org.springframework.stereotype.Controller;  

import org.springframework.web.bind.annotation.RequestMapping;  

import org.springframework.web.servlet.ModelAndView;  

import com.google.code.kaptcha.Constants;  

import com.google.code.kaptcha.Producer;  

  

@Controller  

@RequestMapping("/")  

public class CaptchaImageCreateController {  

      

    private Producer captchaProducer = null;  

  

    @Autowired  

    public void setCaptchaProducer(Producer captchaProducer) {  

        this.captchaProducer = captchaProducer;  

    }  

  

    @RequestMapping("/captcha-image")  

    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {  

  

        response.setDateHeader("Expires", 0);  

        // Set standard HTTP/1.1 no-cache headers.  

        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  

        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).  

        response.addHeader("Cache-Control", "post-check=0, pre-check=0");  

        // Set standard HTTP/1.0 no-cache header.  

        response.setHeader("Pragma", "no-cache");  

        // return a jpeg  

        response.setContentType("image/jpeg");  

        // create the text for the image  

        String capText = captchaProducer.createText();  

        // store the text in the session  

        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);  

        // create the image with the text  

        BufferedImage bi = captchaProducer.createImage(capText);  

        ServletOutputStream out = response.getOutputStream();  

        // write the data out  

        ImageIO.write(bi, "jpg", out);  

        try {  

            out.flush();  

        } finally {  

            out.close();  

        }  

        return null;  

    }  

  

}  

 

 前台调用方式

Java代码  

<div class="chknumber">  

       <label>验证码：          

       <input name="kaptcha" type="text" id="kaptcha" maxlength="4" class="chknumber_input" />               

       </label>  

        <img src="/ClinicCountManager/captcha-image.do" width="55" height="20" id="kaptchaImage"  style="margin-bottom: -3px"/>   

       <script type="text/javascript">      

        $(function(){           

            $('#kaptchaImage').click(function () {//生成验证码  

             $(this).hide().attr('src', '/ClinicCountManager/captcha-image.do?' + Math.floor(Math.random()*100) ).fadeIn(); })      

                  });   

        

       </script>   

     </div>  

 取验证码的方式

Java代码  

String code = (String)session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);  

 如果需要全部数字

Java代码  

<init-param>       

    <param-name>kaptcha.textproducer.char.string</param-name>       

    <param-value>0123456789</param-value>       

</init-param>  

 去掉干扰线

Java代码  

<init-param>  

    <param-name>kaptcha.noise.impl</param-name>  

    <param-value>com.google.code.kaptcha.impl.NoNoise </param-value>  

</init-param>