《Spring開發指南》只寫了一種與struts整合的方法，另一種到Spring2.0 Demo自帶的Doc中查找到Action直接繼承ActionSupport。詳細信息:
To integrate your Struts application with Spring, you have two options:
-
Configure Spring to manage your Actions as beans, using the ContextLoaderPlugin, and set their dependencies in a Spring context file.
-
Subclass Spring's ActionSupport classes and grab your Spring-managed beans explicitly using a getWebApplicationContext() method.
16.3.2. ActionSupport Classes
As previously mentioned, you can retrieve the WebApplicationContext from the ServletContext
using the WebApplicationContextUtils class. An easier way is to extend
Spring's Action classes for Struts. For example, instead of subclassing
Struts' Action class, you can subclass Spring's ActionSupport class.
The ActionSupport class provides additional convenience methods, like getWebApplicationContext(). Below is an example of how you might use this in an Action:
public class UserAction extends DispatchActionSupport { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { if (log.isDebugEnabled()) { log.debug("entering 'delete' method..."); } WebApplicationContext ctx = getWebApplicationContext(); UserManager mgr = (UserManager) ctx.getBean("userManager"); // talk to manager for business logic return mapping.findForward("success"); }}
Spring includes subclasses for all of the standard Struts Actions - the Spring versions merely have Support appended to the name:
The
recommended strategy is to use the approach that best suits your
project. Subclassing makes your code more readable, and you know
exactly how your dependencies are resolved. However, using the ContextLoaderPlugin
allow you to easily add new dependencies in your context XML file.
Either way, Spring provides some nice options for integrating the two
frameworks.
可見第二種方法更加簡便。
JPetstore例子中并沒有使用此方法，而使用了第三種方法。同樣只需要動Action。如下：
public abstract class BaseAction extends Action {
private PetStoreFacade petStore;
public void setServlet(ActionServlet actionServlet) {
super.setServlet(actionServlet);
if (actionServlet != null) {
ServletContext servletContext = actionServlet.getServletContext();
WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
this.petStore = (PetStoreFacade) wac.getBean("petStore");
}
}
protected PetStoreFacade getPetStore() {
return petStore;
}
}
ok，這三種方法都可以讓Spring與Struts整合，相比較第一種（因為配置很多這里沒寫，見refernce 16.3.1），
第二第三種方法比較簡潔，侵入不多。