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The following page has been changed by ndeloof: http://wiki.apache.org/struts/StrutsAndSpring The comment on the change is: ------------------------------------------------------------------------------ - === References === + === Using Spring and Groovy to quick prototype actions === - * Struts + Spring 2.0 + Groovy: http://forum.springframework.org/showthread.php?t=27534 + Spring 2.0 adds support for scripted beans. This mean a script engine can be used to run a script that will look like a regular java class. + Struts also support scripted actions, but this requires to change the struts config. This may be a good option, but not if you want your production web application to use compiled java classes, and just use scripting support for quick application prototyping. + + Using Spring 2.0 scripted-beans, Groovy that can parse a 100% java source file and Struts allow to quickly change a "classic" java action into a scripted bean, and just hit refresh in the browser to see effects of a code change. + + == How to ? == + + 1. Create a simple interface that define the Struts action "execute" method: + + {{{ + public interface StrutsAction + { + public abstract ActionForward execute(ActionMapping mapping, + ActionForm form, HttpServletRequest request, + HttpServletResponse response) throws Exception; + + } + }}} + + 1. Create a SciptedBeanActionAdapter class : + + {{{ + public class SciptedBeanActionAdapter extends Action { + private StrutsAction delegate; + + public SciptedBeanActionAdapter(StrutsAction delegate) { + this.delegate = delegate; + } + + public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { + return delegate.execute(mapping, form, request, response); + } + } + }}} + + 1. Configure your web application to use this requestProcessor : + + {{{ + public class GroovyAutowiringTilesRequestProcessor extends AutowiringTilesRequestProcessor { + + protected Action processActionCreate(HttpServletRequest request, HttpServletResponse response, ActionMapping mapping) + throws IOException { + WebApplicationContext wac = getWebApplicationContext(); + String beanName = DelegatingActionUtils + .determineActionBeanName(mapping); + if (wac.containsBean(beanName)) { + StrutsAction bean = (StrutsAction) wac.getBean(beanName, StrutsAction.class); + return new SciptedBeanActionAdapter(bean); + } + return super.processActionCreate(request, response, mapping); + } + } + }}} + + This processor will look into spring context for a bean that implements StrutsAction and wich name is the action mapping path. + + 1. Add classpath*:localContext.xml to your spring web application context. This file will not be required at runtime, so there is no impact on the production application. + + 1. Put a localContext.xml file into your application server classpath. I myself created it in $TOMCAT/shared/classes. + + 1. Add Groovy, asm and Spring-support jars in your web application libs + + Your application is now ready for quick prototyping ! + + == Hot reload action's java code == + + Now, consider you have a FooAction mapped to "/foo.do" you want to edit quickly. + + 1. Make your action implement StrutsAction. You only have to add "implements StrutsAction" as your action allready extends struts Action and defines the execute method. + + 1. Edit your localContext.xml and add : + + {{{ + <alias name="groovyAction" alias="/foo"/> + <lang:groovy id="groovyAction" + script-source="file:D:/../src/java/.../FooAction.java" + refresh-check-delay="1"> + </lang:groovy> + }}} + + If you want to use dependency injection, simply add + {{{ + <lang:property name="property" ref="bean"/> + }}} + + 1. Start the app, go to your web page. + + 1. Change the code and simply hit refresh to see effects. No recompile, repackage, redeploy required ! +
