在表单中使用post方法时出错 [英] Getting error when using post method in form
问题描述
当我使用post方法将表单传递到下一页时，我得到空值
这个问题的重复
链接文字
I am getting null when I am using post method while passing a form to the next page A repeat of this question link text
<html>
<head>
Title
<script>
function callme()
{
alert("Hi");
alert(document.getElementById("prio").value);
}
</script>
</head>
<body>
<FORM method="post" name="test"enctype="multipart/form-data" action="testjsp.jsp" >
<select name="prio" id="prio">
<option>1</option>
<option>2</option>
</select>
<input type="submit" value="Submit" onClick=callme();>
</form>
</body>
</html>
在testjsp.jsp我试图打印prio变量，我无法做到及其prining null.I只想访问其他服务器端组件中的变量prio，并且还想使用post方法。
IN testjsp.jsp I am trying to prin the prio variable which I am not able to do and its prining null.I just want to access the variable prio in some other server side component and also want to use post method.
<html>
<head>
Title
</head>
<body>
<%
String prio=request.getParameter("prio");
out.println("the value of prio is"+prio);
%>
</body>
</html>
这与幂等属性有关吗？
我很困惑为什么我无法访问testjsp页面中的变量prio。
Is this any way related to Idempotent property? I am confused why I could not access the variable prio in the testjsp page.
推荐答案
您正在编码您的请求如 multipart / form-data ，通常用于上传文件。该servlet容器不包括支持自动解码这些数据，只有 application / x-www-form-urlencoded 数据（默认值）。要使用 multipart / form-data ，您需要第三方MIME解析器，如 Apache commons fileUpload 。
You are encoding your request as multipart/form-data, often used to upload files. The servlet container does not include support to automatically decode this data, only application/x-www-form-urlencoded data (the default). To use multipart/form-data you need a 3rd party MIME parser like Apache commons fileUpload.
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