JSP - 如何在session.setAttribute中传递javascript var？ [英] JSP - how to pass a javascript var in session.setAttribute?

问题描述

学习JSP的新手，并尝试在两个页面之间传递数据。

New to learning JSP, and trying out passing data between two pages.

我想知道是否可以将javascript变量传递给 session.setAttribute（）

I'm wondering if it is possible to pass a javascript variable to session.setAttribute()

目前，我可以通过2个jsp文件传递一串文本，如下所示：

At the moment, I can pass a string of text through 2 jsp files like so:

JSP1：

<% String text = "hello";
session.setAttribute("test", text);%>

JSP2：

var someText = "<%=session.getAttribute("test")%>"

工作正常。

但是，是否可以将 var 传递到 session.setAttribute ？我将一些数据存储在javascript变量中，并希望将其发送到第二个JSP文件。

However, is it possible to pass through a var into session.setAttribute instead? I store some data in a javascript variable and would like to send it across to the second JSP file.

例如：

var number = 7;
<%session.setAttribute("test", number);%>

我已经尝试了这个，我收到错误数字无法解析为变量

I've tried this out and I get the error "number cannot be resolved to a variable"

谢谢！

推荐答案

你不能这样做，因为javascript在客户端上执行&安培; JSP在服务器端执行。

You cannot do that since javascript executes on client & JSP executes on server side.

如果你想将javascript变量设置为JSP会话，那么你可以通过这个URL传递这个变量

If you want to set javascript variable to JSP session, then you pass this variable through the URL like this

var number = 7;
window.location="http://example.com/index.jsp?param="+number;

现在在JSP页面中收到此var

Now receive this var in your JSP page like this

String var = request.getParameter("param");

现在将其设置为会话

session.setAttribute("test", var);

编辑：

var number = 7;
<%session.setAttribute("test", number);%>

在上面的代码中，服务器只会执行< %%>内的代码。它不知道JSP标记之外的任何内容。所以，它也不会知道你的javascript变量数字。

In the above code, server will only execute the code inside <% %>. It does not know anything outside of the JSP tags. So, it will also dont know about your javascript variable number.

服务器执行代码&结果将被发送到浏览器，然后您的浏览器将执行该javascript代码 var number = 7; 。

Server executes the code & the result will be sent to the browser, then your browser will execute that javascript code var number=7;.

希望，现在很清楚。

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