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Including JSP page into another JSP page, how to avoid multiple HEAD / BODY sections?

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逝去的感伤
逝去的感伤 2021-01-14 13:17

I would like to include a JSP page into another JSP page. Let\'s say that I have master.jsp that is including slave.jsp.

As slave.jsp

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  • 甜味超标
    2021-01-14 13:48

    I went for this solution by passing a parameter when including the page.

    in master.jsp

    <head>
  blablabla
  <c:import url="slave.jsp">
    <c:param name="sectionName" value="HEAD" />
  </c:import>
</head>
<body>
  blablabla
  <c:import url="slave.jsp">
  </c:import>
</body>

    and then in slave.jsp the parameter is read and the custom part of the page is rendered. 

    <c:choose>
  <c:when test="${param.sectionName == 'HEAD'}">
     head section here [without the <HEAD> tags !]
  </c:when>
  <c:otherwise>
     body section here [without the <BODY> tags !]
  </c:otherwise>
</c:choose>

    not too nice to see but working. In this way I am able to remove the duplication of HEAD and BODY parts.

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  • 梦如初夏
    2021-01-14 13:51

    You cannot and should not merge two <html> documents in each other. This would produce invalid output. Better include CSS/JS conditionally with help of JSTL c:if or c:choose tags.

    Basic example:

    <head>
    <script type="text/javascript" src="global.js"></script>
    <c:if test="${isAdminPage}">
        <script type="text/javascript" src="admin.js"></script>
    </c:if>
</head>
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  • 眼角桃花
    2021-01-14 13:52

    Outside of sitemesh, you're pretty much out of luck. However I would reconsider your design if you think that the setup per page is impractical. How many pages will your app have?

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  • 难免孤独
    2021-01-14 13:57

    You could also extend the conditional option, and make a meta.jsp (for example), which contains a Map for each of the head elements - meta tags, css hrefs, script hrefs, and use the name of the jsp as a key in that Map. Then you call request.getRequestURI(), and show whatever you have put in the map under that key. Not a very beautiful solution, but working.

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