JSP Custom Taglib：嵌套评估 [英] JSP Custom Taglib: Nested Evaluation

问题描述

说我有自定义taglib：

Say I have my custom taglib:

<%@ taglib uri="http://foo.bar/mytaglib" prefix="mytaglib"%>
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%>

<mytaglib:doSomething>
  Test
</mytaglib:doSomething>

在taglib类中，我需要处理模板并告诉JSP重新评估其输出，所以例如，如果我有这个：

Inside the taglib class I need to process a template and tell the JSP to re-evaluate its output, so for example if I have this:

public class MyTaglib extends SimpleTagSupport {

  @Override public void doTag() throws JspException, IOException {
    getJspContext().getOut().println("<c:out value=\"My enclosed tag\"/>");
    getJspBody().invoke(null);
  }
}

我的输出是：

<c:out value="My enclosed tag"/>
Test

当我实际需要输出时：

My enclosed tag
Test

这可行吗？怎么样？

谢谢。

推荐答案

Tiago，我不知道如何解决完全问题，但您可以从文件中解释JSP代码。只需创建一个RequestDispatcher并包含JSP：

Tiago, I do not know how to solve your exact problem but you can interpret the JSP code from a file. Just create a RequestDispatcher and include the JSP:

    public int doStartTag() throws JspException {
    ServletRequest request = pageContext.getRequest();
    ServletResponse response = pageContext.getResponse();

    RequestDispatcher disp = request.getRequestDispatcher("/test.jsp");
    try {
        disp.include(request, response);
    } catch (ServletException e) {
        throw new JspException(e);
    } catch (IOException e) {
        throw new JspException(e);
    }
    return super.doStartTag();
}

我在Liferay portlet中测试了这段代码，但我相信它应该适用于无论如何其他情况。如果没有，我想知道：）

I tested this code in a Liferay portlet, but I believe it should work in other contexts anyway. If it don't, I would like to know :)

HTH

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