java 验证码实现
java jsp页面验证码刷新实现，不带后台代码
<img id="image1" src="http://localhost:8080/offm/Imageff" border="1" class="verifyimg" height="30px" width="120 px" onClick="getcode(this)"/>
<a href="#" οnclick="changeCode();">看不清，换一张</a><br/>
<script type="text/javascript">
function changeCode(){
var img=document.getElementById("image1");
img.src="http://localhost:8080/onlineExam/ImageChack?"+new Date().getTime();
}
function getcode() {
var randomnum = Math.random();
var img = document.getElementById("image1");
img.src = "http://localhost:8080/offm/Imageff?d=" + randomnum;
}
</script>
效果图
点击图片可以刷新验证码
点击看不清换一张也可刷新验证码