maven项目 图片验证码

———-pom.xml配置

<!-- kaptcha --><dependency>    <groupId>com.github.penggle</groupId>    <artifactId>kaptcha</artifactId>    <version>2.3.2</version></dependency>

———-web.xml配置

<servlet>      <servlet-name>Kaptcha</servlet-name>      <servlet-class>     com.google.code.kaptcha.servlet.KaptchaServlet    </servlet-class>  /**属性配置可不写，试用默认即可start**/<init-param>    <param-name>kaptcha.image.width</param-name>    <param-value>200</param-value>    <description>  Width in pixels of the kaptcha image. </description>   </init-param>   <init-param>    <param-name>kaptcha.image.height</param-name>    <param-value>50</param-value>   <description>     Height in pixels of the kaptcha image.、 </description>  </init-param>  <init-param>    <param-name>kaptcha.textproducer.char.length</param-name>    <param-value>4</param-value>    <description>  The number of characters to display.  </description>  </init-param>   <init-param>   <param-name>kaptcha.noise.impl</param-name>   <param-value>     com.google.code.kaptcha.impl.NoNoise </param-value>          <description>The noise producer.</description>   </init-param>    /**属性配置可不写，试用默认即可end**/   </servlet>    <servlet-mapping>          <servlet-name>Kaptcha</servlet-name>          <url-pattern>/kaptcha.jpg</url-pattern>    </servlet-mapping>  

———-html使用注意图片id

 <div class="control-form">    <input type="text" name="picNo" id="picNo" tabindex="2"     class="ui-input valid" placeholder="请输入图片识别码">   <img  id="kaptchaImage" src="../sign/kaptcha.jpg" /> </div>

———-调用方法

@Autowired    public void setCaptchaProducer(Producer captchaProducer) {        this.captchaProducer = captchaProducer;    }    /**     *      * @Description 获取图片验证码     * @author pm     * @param request     * @param response     * @return     * @throws Exception     */    @RequestMapping("/kaptcha.jpg")    @NoLogin    public ModelAndView handleRequest(HttpServletRequest request,            HttpServletResponse response) throws Exception {        // Set to expire far in the past.        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;    }

———-验证图片验证码是否正确

@RequestMapping("/checkPic.do")    @NoLogin    public @ResponseBody JsonResp checkPic(SignVo signVo,            HttpServletRequest request) throws Exception {        JsonResp resp = null;        // 验证图片验证码        String kaptchaExpected = (String) request.getSession().getAttribute(                com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);        if (!signVo.getPicNo().equals("")) {            if (!signVo.getPicNo().equals(kaptchaExpected)) {                resp = new JsonResp(JsonResp.STATE_ERR);                return resp;            }        }        resp = new JsonResp(JsonResp.STATE_OK);        return resp;    }