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q.What's the Difference between Forward and Include?

The <jsp:forward> action enables you to forward the request to a static HTML file, a servlet, or another JSP.

<jsp:forward page="url" />

The JSP that contains the <jsp:forward> action stops processing, clears its buffer, and forwards the request to the target resource. Note that the calling JSP should not write anything to the response prior to the <jsp:forward> action.

You can also pass additional parameters to the target resource using the <jsp:param> tag.

<jsp:forward page="test.htm" >
<jsp:param name="name1" value="value1" />
<jsp:param name="name2" value="value2" />
</jsp:forward>

In this example, test.jsp can access the value of name1 using request.getParameter("name1").

<jsp:include execute the code and force a flush of the buffer in the output stream.
If a.jsp has the code like
<jsp:include page="template.jsp" flush="true" >
<jsp:param name="name1" value="value1" />
</jsp:include>

then template.jsp execute and the output is placed in a.jsp

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