servlet结果显示在jsp页面中 [英] servlet result display in jsp page

问题描述

如何将servlet输出转发到jsp页面?

How to forward the servlet output to jsp page?

这意味着结果将显示在JSP页面中.

That means the result will be displayed in the JSP page.

推荐答案

您通常不使用servlet来生成HTML输出.您通常为此使用JSP/EL.使用out.write和consorts流HTML内容被认为是不好的做法.更好地利用请求属性.

You normally don't use a servlet to generate HTML output. You normally use JSP/EL for this. Using out.write and consorts to stream HTML content is considered bad practice. Better make use of request attribtues.

例如:

protected void doGet(HttpServletRequest request, HttpServletResponse response) {
    Object data = "Some data, can be a String or a Javabean";
    request.setAttribute("data", data);
    request.getRequestDispatcher("/WEB-INF/page.jsp").forward(request, response);
}

在web.xml中将其映射到例如/page的<url-pattern>上.将JSP放在/WEB-INF中以防止直接访问.然后，您可以在JSP中使用EL(表达语言 )以访问范围内的属性:

Map this in web.xml on an <url-pattern> of for example /page. Place the JSP in /WEB-INF to prevent direct access. Then in the JSP you can use EL (Expression Language) to access scoped attributes:

<p>The data from servlet: ${data}</p>

通过http://example.com/context/page调用servlet.就那么简单.这样，您可以在一个位置(即JSP)控制输出和表示.

Call the servlet by http://example.com/context/page. Simple as that. This way you control the output and presentation at one place, the JSP.

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