jsp:include vs. the include directive

Greenhorn

Posts: 16

posted 18 years ago

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Consider the contents of 2 JSP files:
File : test.jsp
<html>
<body>
<% String s = "Hello"; %>
//1 insert LOC here.
<%=s%>
</body>
</html>

File : test2.jsp
<% s = s+" world"; %>

According to what I've read, inserting '<jsp:include page="test2.jsp"/>' at //1 causes an error, since s isn't defined in test2.jsp. My questions:

- Is this true?
- If so, does that mean anything included with jsp:include must be a complete JSP (i.e., start and end with <head><body>

?
- Does this mean a file imported with c:import must also be a 'complete' JSP?

Thanks,
Stephen

Serghei Jelauc

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Posts: 128

posted 18 years ago

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Yes it is true. Using <jsp:inlude> standard action each jsp file will be compiled and executes separately and only after it the output (not content) of the page2.jsp will be included into the page1.jsp.
Using <%@ include> directive the content of the page2.jsp will be included into the page1.jsp and only after it, page1.jsp will be compiled (for a first request) and executed.

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Bhumika Thakkar

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Posts: 79

posted 18 years ago

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You should NOT add html start/end tags in your included jsp page.

The included jsp page won't have access to the local variables of the caller page. If you want to access a variable that is defined in the caller put it in attributes or params.

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Narendra Dhande

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posted 18 years ago

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Hi,

Including start/ end HTML tag does not change the JSP execution. Most of the boroser display properly such content. But it is good practice not to incluse such a tags in included HTML. Some browsers/ application thtat validate the HTML may not take such HTML codes.

Thanks

Narendra Dhande
SCJP 1.4,SCWCD 1.4, SCBCD 5.0, SCDJWS 5.0, SCEA 5.0

Vishwa Kumba

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posted 18 years ago

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Originally posted by Narendra Dhande:
Hi,

Including start/ end HTML tag does not change the JSP execution. Most of the boroser display properly such content. But it is good practice not to incluse such a tags in included HTML. Some browsers/ application thtat validate the HTML may not take such HTML codes.

Thanks

I think IE 6.0 works OK with multiple HTML start/end tags, but not sure about Netscape and FireFox.

Coming to the difference, the include directive is an inclusion at compile time(page translation time) and the action include is inclusion at run time.

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