在spring MVC中引入captcha的插件生成图片验证码

<！--xml 形式定义bean ---><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.background.clear.from">white</prop>                    <prop key="kaptcha.background.clear.to">white</prop>                    <prop key="kaptcha.textproducer.font.color">black</prop>                    <!--<prop key="kaptcha.textproducer.font.size">80</prop>-->                    <prop key="kaptcha.image.width">200</prop>                    <prop key="kaptcha.image.height">50</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>
/**java 形式定义bean**/
@Componentpublic class ValidateImg extends DefaultKaptcha{    public ValidateImg(){        Properties p = new Properties();        p.setProperty("kaptcha.border", "no");        p.setProperty("kaptcha.background.clear.from","white");        p.setProperty("kaptcha.background.clear.to","white");        p.setProperty("kaptcha.textproducer.font.color","black");        p.setProperty("kaptcha.image.width","200");        p.setProperty("kaptcha.image.height","50");        p.setProperty("kaptcha.session.key","code");        p.setProperty("kaptcha.textproducer.char.length","4");        p.setProperty("kaptcha.textproducer.font.names","宋体,楷体,微软雅黑");        Config config = new Config(p);        this.setConfig(config);    }
   两种形式定义一种即可

  2.java 实现

@Controller
@RequestMapping("kaptcha")
public class CaptchaAction {
     
    @Autowired
    private Producer captchaProducer;//此处可以是注入Valiadate
    @Autowired
    LoginService loginService;
 
    @RequestMapping("getKaptchaImage")
    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
        HttpSession session = request.getSession();
        String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
        System.out.println("******************验证码是: " + code + "******************");
         
        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;
    }
    @RequestMapping("checkmCode")
    @ResponseBody
    public String checkCode(HttpServletRequest request,String mcode){
        AjaxJson ajaxJson = new AjaxJson();
        System.out.println("要校验的验证码:"+mcode);
        if (loginService.isZCCodeRight(request,mcode)) {
            ajaxJson.setSuccess(true);
        }else {
            ajaxJson.setSuccess(false);
             
        }
        return ajaxJson.getJsonStr();
    }
 
}

3.前台实现
<dt>验证码:</dt>
<dd>
    <input  id="mcode" name="mcode" value="" onchange="checkmcode()" class="hst2"  style="vertical-align:middle"/>
    <img id=""  style="vertical-align:middle" alt="验证码" onclick="this.src='${base}/kaptcha/getKaptchaImage.htm?e='+new Date()" src="${base}/kaptcha/getKaptchaImage.htm"/>
    <img id="mcodecheck" src="" alt=""  style="vertical-align:middle"/>
</dd>

4.js 代码
function checkmcode(){
    var mcode = $("#mcode").val();
    $.ajax({
        async : false,
        cache : false,
        type : 'POST',
        url : '${base}/kaptcha/checkmCode.htm',// 请求的action路径
        data:{"mcode":mcode},//参数
        error : function() {// 请求失败处理函数
        },
        success : backfunc
    });
}
function backfunc(data){
    var d = $.parseJSON(data);
    if(d.success){
        $("#mcodecheck").attr("src","${base}/res/images/ok.png");
    }else{
        $("#mcodecheck").attr("src","${base}/res/images/no.png");
    }
}


4.js 代码:
function checkmcode(){
    var mcode = $("#mcode").val();
    $.ajax({
        async : false,
        cache : false,
        type : 'POST',
        url : '${base}/kaptcha/checkmCode.htm',// 请求的action路径
        data:{"mcode":mcode},//参数
        error : function() {// 请求失败处理函数
        },
        success : backfunc
    });
}
function backfunc(data){
    var d = $.parseJSON(data);
    if(d.success){
        $("#mcodecheck").attr("src","${base}/res/images/ok.png");
    }else{
        $("#mcodecheck").attr("src","${base}/res/images/no.png");
    }
}