Struts 1 vs Struts 2
by, 11-18-2011 at 07:17 PM (2771 Views)
In the following article, we are going to compare the various features between the two frameworks. Struts 2 is very simple as compared to struts 1, few of its important features are:
1. Servlet Dependency
Actions in Struts1 have dependencies on the servlet API since the HttpServletRequest and HttpServletResponse objects are passed to the execute method when an Action is invoked while in case of Struts 2, Actions are not container dependent because they are made of simple POJOs.
In Struts 2, the servlet contexts are represented as simple Maps which allows actions to be tested in isolation. Struts 2 Actions can access the original request and response, if required. However, other architectural elements reduce or eliminate the need to access the HttpServetRequest or HttpServletResponse directly.
2. Action classes
Programming the abstract classes instead of interfaces is one of major design issues of struts1 framework that has been resolved in the struts 2 framework.
Struts1 Action classes needs to extend framework dependent abstract base class, while in case of Struts 2 Action class may or may not implement interfaces to enable optional and custom services. In case of Struts 2 , Actions are not container dependent because they are made simple POJOs.
Struts 2 provides a base ActionSupport class to implement commonly used interfaces. Perhaps, the Action interface is not required. Any POJO object with an execute signature can be used as an Struts 2 Action object.
Struts1 and Struts 2 both supports the manual validation via a validate method.
Struts1 uses validate method on the ActionForm, or validates through an extension to the Commons Validator. However, Struts 2 supports manual validation via the validate method and the XWork Validation framework. The Xwork Validation Framework supports chaining validation into sub-properties using the validations defined for the properties class type and the validation context.
4. Threading Model
In Struts1, Action resources must be thread-safe or synchronized. So Actions are singletons and thread-safe, there should only be one instance of a class to handle all requests for that Action. The singleton strategy places restrictions on what can be done with Struts1 Actions and requires extra care to develop. However in case of Struts 2, Action objects are instantiated for each request, so there are no thread-safety issues.
A major hurdle to test Struts1 Actions is that the execute method because it exposes the Servlet API. Where as the Struts 2 Actions can be tested by instantiating the Action, setting properties and invoking methods. Dependency Injection support also makes testing simpler. Actions in struts2 are simple POJOs and are framework independent, hence testability is pretty easy in struts2.
6. Harvesting Input
Struts1 uses an ActionForm object to capture input. And all ActionForms needs to extend a framework dependent base class. JavaBeans cannot be used as ActionForms, so the developers have to create redundant classes to capture input.
However, Struts 2 uses Action properties (as input properties independent of underlying framework) that eliminates the need for a second input object, hence reduces redundancy. Additionally in struts2, Action properties can be accessed from the web page via the taglibs. Struts 2 also supports the ActionForm pattern, as well as POJO form objects and POJO Actions. Even rich object types, including business or domain objects, can be used as input/output objects.
7. Expression Language
Struts1 integrates with JSTL, so it uses the JSTL-EL. The struts1 EL has basic object graph traversal, but relatively weak collection and indexed property support. Struts 2 can also use JSTL, however it supports a more powerful and flexible expression language called "Object Graph Notation Language" (OGNL).