Struts example source code file (jsp_0.jsp)

This example Struts source code file (jsp_0.jsp) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

assuming, attributes, http, if, if, in, like, pragma, stack, stack, string, string, value, value

The Struts jsp_0.jsp source code

<%
    request.setAttribute("decorator", "none");
    response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
    response.setHeader("Pragma","no-cache"); //HTTP 1.0
    response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>
<p>
    <b>String Attributes
</p>
<p>
    Some tag attributes are expected to be Strings in which case String literals
    can be passed as the value, like the <i>href attribute in the a tag.
</p>
<p>
    <i>
        <s:a href="http://struts.apache.org/" /> 
    </i>
</p>
<p>
   If the value that you want to use in one of these string literal attributes is stored on the Value Stack,
   then the <i>%{#name} syntax (alternative syntax) needs to be used. Assuming there is a value
   with the name "url" stored on the stack:
</p>
<p>
    <i>
        <s:a href="%{#url}" />
    </i>
</p>
<p>
  will create an anchor and use the value of "url" for the <i>href attribute.
</p>
<p>
    <b>Value Attributes
</p>
<p>
    Other attributes expect an object as their value(not an string literal). In these attributes you can specify
    the name of a variable stored on the Value Stack, and the tag will look it up and use it. Like the
    <i>value attribute in the property tag. Assuming there is an object stored on the Value Stack with
    the name "movie", then:
</p>
<p>
    <i>
        <s:property value="movie" />
    </i>
</p>
<p>
  will print the value to the page. To pass an String literal to an attribute that expects a value use the <i>%{'string'}
  notation.
</p>
<p>
  If you don't remember if an attribute expects an string literal or a value, you can always use the <i>%{value} notation:
</p>
<p>
    <i>
        <s:a href="%{'http://struts.apache.org/'}" />
        <br />
        <s:property value="%{#movie}" />
    </i>
</p>
<p>
    <a href="#" onclick="window.open('http://struts.apache.org/2.x/docs/tag-syntax.html')">[More details]
</p>