Struts example source code file (jsp_3.jsp)

This example Struts source code file (jsp_3.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.

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The Struts jsp_3.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>set tag
</p>
<p>
    The <i>set tag sets the variable with the name specified in the name attribute to 
    the value specified in the <i>value attribute in the scope
    entered in the <i>scope attribute. The available scopes are:
    <ul>
        <li>application - application scope according to servlet spec
        <li>session - session scope according to servlet spec
        <li>request - request scope according to servlet spec
        <li>page - page scope according to servlet sepc
        <li>action - the value will be set in the request scope and Struts' action context
        
    </ul>
</p>
<p>    
    This example sets <i>favouriteBand in the request scope to the first element of the bands property:
</p>
<p>
    <pre id="example0">
        <s:set name="favouriteBand" value="bands[0]" />
        <s:property value="#favouriteBand" />
    </pre>
</p>
<p>
    <a href="#" onclick="execJSP('example0')">Do it for me
</p>
<p>
    <b>url tag
</p>
<p>
    The <i>url tag is used to build urls (who would have guessed!). To build an url mapping to
    an action, set the <i>namespace and action attributes. The url will be stored under
    the name specified in the <i>id attribute. url tag uses the id attribute while 
    the <i>set tag uses name. To specify a value (no action lookup), just use the value
    attribute. <i>param tags can be nested inside the url tag to add parameters to the url.
</p>
<p>    
    First link creates a url that maps to an action, second one creates a url to google, passing one parameter:
</p>
<p>
    <pre id="example1">
        <s:url id="evalAction" namespace="/nodecorate" action="jspEval" />
        <s:a href="%{#evalAction}" >Eval</s:a>
        
        <s:url id="google" value="http://www.google.com" >
            <s:param name="q" value="%{'Struts 2'}" /> 
        </s:url>
        <s:a href="%{#google}" >Eval</s:a>
    </pre>
</p>
<p>
   <a href="#" onclick="execJSP('example1')">Do it for me
</p>
<p>
    <a href="#" onclick="window.open('http://struts.apache.org/2.x/docs/set.html')">[More on the set tag]
    <a href="#" onclick="window.open('http://struts.apache.org/2.x/docs/url.html')">[More on the url tag]
</p>