java绘制图片验证码两种方式实现，点击【图片】刷新和点击【看不清换一张】刷新

转载地址：https://blog.youkuaiyun.com/Jiang_Rong_Tao/article/details/78063295

点击打开链接

1、（看不清，换一张），点击刷新验证码

<img id="image1" src="http://localhost:8080/om/Ik" border="1" class="verifyimg" height="30px" width="120 px" "/>

 <a href="#" onclick="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();
          }
</script>

2、点击验证码，即可刷新验证码的图片

<img id="image1" src="http://localhost:8080/om/Ik" border="1" class="verifyimg" height="30px" width="120 px" onClick="getcode(this)"/>

<script type="text/javascript">
function getcode() {
    var randomnum = Math.random();
    var img = document.getElementById("image1");
    img.src = "http://localhost:8080/om/Ik?d=" + randomnum;

}