JSP结合js实现img中src更新请求的方法

浅沫记忆

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" />
  <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" >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。