Question

我想将messsge显示为“Please Wait ........”直到我的java代码完成一些处理。

page1.jsp - 我的表单，我有文本框和提交按钮。当点击提交按钮时，我正在进行表单提交并调用page2.jsp

在page2.jsp中我从page1.jsp请求参数并传递给我的java方法，该方法返回userid。

userid = myclass.mymethod(); 
if(userid!=null){ 
out.println("Record is in process.Please wait"); 
} 
response.sendredirect("page3.jsp?"+userid=userId);

在page3.jsp中的

我正在同时处理page2.jsp中的userid进行处理。

someid =request.getparameter(userid); 
process(someid );

但是所有处理完成后都会显示“等待”消息。我想在userId后立即显示它。并继续对该userId进行后台处理。

Answer 1

您可以使用javascript做很多事情。这是一个想法。

<html>
<body>
<div id="wait">
Some text here is necessary here for the IE browser to start displaying. 
Otherwise it will wait until it receives enough of a response to begin displaying         anything.
I am not sure how much padding is necessary. This works in IE 8.
<%
  out.print("<little.gif' />");
  out.flush();
  for(int x = 0; x < 3; x++){
                         out.print("<br/>Processing!");
                         out.flush();
                         Thread.sleep(3000);  //mock processing
  }
%>
<br/></div>
<script>
  alert("Finished processing.");
  document.getElementById("wait").innerHTML = "Here are the results...";
</script>
</body>
</html>

Answer 2

我在IE8和Chrome 18中测试过。如果您的服务器有限制，那么您可能会遇到问题。例如，它无法在Google App Engine上运行。

<html>
<body>
Some text here is necessary here for the IE browser to start displaying. 
Otherwise it will wait until it receives enough of a response to begin displaying      anything.
I am not sure how much padding is necessary. This works in IE 8.
<%
  out.print("<loading.gif' />");
  out.flush();
  //mock processing
  for(int x = 0; x < 3; x++){
                         out.print("<br/>Processing!");
                         out.flush();
                         Thread.sleep(3000);  
  }
%>
<br/>Finished processing. Here are the results...
</body>
</html>

显示消息等待....作为后台处理发生

2 个答案: