java 如何在jsp-servlets中与请求页面相同的页面上显示结果
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How to display results on same page as requesting page in jsp-servlets
提问by Dhruv
I developing this web app using jsp and servlets. I was wondering how to display results on same page as on from which the request was made. For example, usually what I do is that a request is sent from one jsp to a servlet and then servlet sends the response/results on separate jsp. I am want to show a database results on same page. How can this be done?..A code snippet would be appreciated. Thanks
我使用 jsp 和 servlet 开发这个 web 应用程序。我想知道如何在与发出请求的页面相同的页面上显示结果。例如，通常我所做的是将请求从一个 jsp 发送到 servlet，然后 servlet 在单独的 jsp 上发送响应/结果。我想在同一页面上显示数据库结果。如何做到这一点？...代码片段将不胜感激。谢谢
回答by BalusC
Just set the necessary data in the request scope and use RequestDispatcher#forward()to forward the control to the desired JSP which in turn can generate the appropriate HTML based on the results.
只需在请求范围内设置必要的数据，并用于RequestDispatcher#forward()将控件转发到所需的 JSP，后者又可以根据结果生成适当的 HTML。
request.setAttribute("results", results);
request.getRequestDispatcher("/WEB-INF/page.jsp").forward(request, response);
This is also demonstrated in the hello world examples in our servlets wiki page.
这也在我们的 servlet wiki 页面中的 hello world 示例中得到了演示。
回答by Carlos Gavidia-Calderon
That's totally posible, but you need to include JavaScript in your toolset. What I'm suggesting is an AJAX approach in your application, and that implies intensive use of client-side scripting (i.e JavaScript).
这是完全可能的，但您需要在您的工具集中包含 JavaScript。我建议在您的应用程序中使用 AJAX 方法，这意味着大量使用客户端脚本（即 JavaScript）。
This tutorialfrom DeveloperWorks makes a pure JavaScript/Servlet approach. If you want to do more advanced stuff, I strongly suggest you to use a JavaScript Framework with AJAX support, like JQuery.
来自DeveloperWorks 的本教程采用纯JavaScript/Servlet 方法。如果你想做更高级的事情，我强烈建议你使用支持 AJAX 的 JavaScript 框架，比如JQuery。
回答by Luiggi Mendoza
From your servlet, send a redirect to your same page. Also, set some attributes in request and show it in your page, e.g. save List<MyObject>in request, then in your jsp read the list from request and show the values in a table.
从您的 servlet，将重定向发送到您的同一页面。另外，在请求中设置一些属性并将其显示在您的页面中，例如保存List<MyObject>在请求中，然后在您的jsp 中从请求中读取列表并在表中显示值。
