从Servlet到JSP获取数据而无需转发? [英] Get data from servlet to JSP without forward?

问题描述

我需要从servlet到我的JSP中的标记的双精度值.我的doGet()正在使用ArrayList中的值发送回格式化的HTML表，因此在完成这项工作后，我决定解决这一部分.

I need a double value from my servlet to markup in my JSP. My doGet() is sending back formatted HTML tables with values from an ArrayList, so after I got that working I decided to tackle this part.

Servlet:

//获取我需要的表的代码

//Code getting the tables I need

    //Send back the result, this all works good
    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");
    response.getWriter().write(returnAsHTML.toString());

我添加尝试获得双精度值的东西

What I added to try and get the double value

    //Send back the result

    double test = 20;
    request.setAttribute("Test",test);

    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");
    response.getWriter().write(returnAsHTML.toString());

    getServletContext().getRequestDispatcher("index.jsp").forward(request,response);

在JSP中:

  <!-- This variable is unresolved -->
  <small>Test : ${Test}</small>

转发似乎使整个聚会崩溃.我是JSP的新手，我敢肯定我缺少一些小东西.我需要将response.getWriter()内容保存在其中，它会获得很多我需要的信息.现在，我只是也不知道如何获取我需要的double值，因为它们将显示在页面的整个不同部分.

The forwarding seems to crash the whole party. I am new to JSP, I'm sure I am missing something small. I need to keep the response.getWriter() stuff there, it gets a lot of the information I need. Now I just don't know how to get my double values I need as well, because they will be displayed on a whole different part of the page.

推荐答案

您不能将输出同时写入servletOutputStream 和 重定向时间.

您对浏览器有什么期望:显示内容或导航到另一个页面?如果是第一个，请不要重定向.如果第二个，则不显示HTML内容.

What do you expect from the browser: to display content or to navigate to another page? If the first, don't redirect. If the second, don't display HTML content.

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