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 src="shop.do?method=registerImage" /> <input type="text" onblur="testCode(this)"/> <div> <p> <span>请输入图片中的四个字母。</span> <span></span> <a href="#">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; }