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JSP: Actions basics

Actions are marginally nicer versions of scriptlets, at least some actions that you can perform in scriptlets.
 
<jsp:include page="some.jsp">
	<jsp:param name="hi" value="there />
</jsp:include>

This will include a file like scriptlet, but it's run at runtime, so the page value can be dynamically created.
 
You can import a Java bean (a getter and setter object with an empty constructor).
 
<%@ page import="thing.Hello" %>
<jsp:useBean id="bean" class="thing.Hello" />

The actual bean is this is simple enough:
 
package thing;
public class Bean {

	private String thing = "";

	public String getThing() {
		return thing;
	}

	public void setThing(String thing) {
		this.thing = thing;
	}
}

Now you can access it using a scriptlet using the variable 'bean'. You can also use the getProperty and setProperty action:
 
<jsp:setProperty name="bean" property="thing" value="SAAATTAAAN" />

<jsp:getProperty name="bean" property="thing" />

You can also use the getProperty and setProperty actions to manipulate request parameters. Below we set the object based on the URL parameter other:
 
<jsp:setProperty name="bean" property="thing" param="other" />

If you omit the 'param' part, we'll set the thing property via thing in the URL, example.com/hiya?thing=THIS, for example. Or if we put a '' in the property we'll set the entire bean via parameter properties.
 
You can also forward pages to another page, and pass parameters there:
 
<% if(bean.getThing().equals("SAAAATAAAAAN")) { %>



<% } %>

java jsp jsp-actions

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