java Jquery 发布到 Servlet
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Jquery Post to Servlet
提问by danny.lesnik
I have the following code on client side:
我在客户端有以下代码：
<script src="http://code.jquery.com/jquery-1.5.js"></script>
<script>
$(document).ready(function() {
$("a").click(function() {
//var orderId = $("#orderId").val();
$.post("test", { orderId : "John"},
function(data) {
alert("Data Loaded: " + data);
});
});
});
</script>
Server side:
服务器端：
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
PrintWriter writer = response.getWriter();
try{
String orderId = request.getAttribute("orderId").toString();
writer.write(orderId);
writer.close();
}
catch(Exception ex)
{
ex.getStackTrace();
}
}
my
我的
request.getAttribute("orderId")
is null and I'm getting null reference exeption. What am I doing wrong?
为空，我得到空引用例外。我究竟做错了什么？
回答by WhiteFang34
I think you want request.getParameter("orderId"). Attributes are only for server side use while processing the request. Parameters contain request data from the client side.
我想你想request.getParameter("orderId")。属性仅在处理请求时供服务器端使用。参数包含来自客户端的请求数据。
回答by Abdel Raoof
You should use getParameter method instead of getAttribute.
您应该使用 getParameter 方法而不是 getAttribute。
request.getParameter("orderId")
getParameter() will retrieve a value that the client has submitted. Where as you should use getAttribute() when you submit the request to another resource (server side).
getParameter() 将检索客户端提交的值。当您将请求提交给另一个资源（服务器端）时，您应该在哪里使用 getAttribute()。
