JSP结合js实现img中src更新请求的方法

本文实例讲述了JSP结合js实现img中src更新请求的方法。分享给大家供大家参考。具体如下：
1.javascript（更新的函数）

<script type="text/javascript"> function changeImage（）{ var img = document.getElementById（"imgVcode"）;if（img.name == 1）{ img.name = 2; img.src = "shop.do?method=registerImage2";}else if（img.name == 2）{ img.name = 1; img.src = "shop.do?method=registerImage";} } </script>

2.jsp中img和img改变的代码

<td> <img class="yzm_img" id="imgVcode" name="1" src="shop.do?method=registerImage" /><input name="code" type="text" id="txtVerifyCode" class="yzm_input" onblur="testCode（this）"/><div class="text_left t1"><p class="t1"><span id="vcodeValidMsg">请输入图片中的四个字母。</span> <span id="codeInfo" style="color:red"></span> <a href="#" id="imgchange" onclick="changeImage（）">看不清楚？换个图片</a></p> </div> </td>

3.后台action代码

public ActionForward registerImage（ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response）throws Exception { //将image创建,返回认证码 response.setContentType（"image/jpeg"）; OutputStream out = response.getOutputStream（）; String strEnsure = shopManager.createImageInfo（50,20,out）;//设置到session中 request.getSession（）.setAttribute（"strEnsure", strEnsure）;return null; } public ActionForward registerImage2（ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response）throws Exception { //将image创建,返回认证码 response.setContentType（"image/jpeg"）; OutputStream out = response.getOutputStream（）; String strEnsure = shopManager.createImageInfo（50,20,out）;//设置到session中 request.getSession（）.setAttribute（"strEnsure", strEnsure）;return null; }

希望本文所述对大家的JavaScript程序设计有所帮助。