java 验证码求解啊

Question

我是新手 有个验证码的类  但是导入之后不能做到 点击就更换验证码 求大神解答前台<img  alt="" border="0" src="v.code" onclick="this.src='v.code'">web.xml<servlet>
        <servlet-name>code</servlet-name>
        <servlet-class>util.GetCaptchaServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>code</servlet-name>
        <url-pattern>*.code</url-pattern>
    </servlet-mapping>

Answer 1

<img src="/servlet/jcaptcha?" id="vcode" style="cursor:pointer;" onclick="this.src=this.src+'?'" alt="看不清?请点击刷新!" title="看不清?请点击刷新!" />

Answer 2

试试  onclick="this.src='v.code?id='+  Math.random()"

Answer 3

试试  onclick="javascript:this.src='v.code?id='+  Math.random()"

Answer 4

<img id="num" src="checkCode" />
<a href="javascript:;"
onclick="document.getElementById('num').src = 'checkCode?'+(new Date()).getTime()">换一张</a>在servlet里面配置一下checkCode, 然后在checkCode对应一个你已经写好的验证码类,配置一下就行了
给分吧~