What is ActionContext in struts2?
The ActionContext is the context in which an Action is executed. Each context is basically a container of objects an action needs for execution like the session, parameters, locale, etc. The ActionContext is thread local which means that values stored in the ActionContext are unique per thread.
Which of the following is the default object of the ActionContext?
A root is a default object in the context map and all objects it contains could be referenced without # . Framework sets this object to value stack.
Which method must be overridden when action class implements SessionAware?
the setSession method
When your Action class needs to access the HTTP session object implement the SessionAware interface and override the setSession method.
How do I get application context in struts2?
In Struts 2 , you can use the following two methods to get the ServletContext object.
- ServletActionContext. Get the ServletContext object directly from org. apache. struts2. ServletActionContext.
- ServletContextAware. Make your class implements the org. apache. struts2. util.
What is struts OGNL?
The Object-Graph Navigation Language (OGNL) is a powerful expression language that is used to reference and manipulate data on the ValueStack. OGNL also helps in data transfer and type conversion. The OGNL is very similar to the JSP Expression Language.
Which servlet does the Struts framework use?
Overview of the Application When you use Struts, the framework provides you with a controller servlet, ActionServlet , which is defined in the Struts libraries that are included in the IDE, and which is automatically registered in the web.
Can we integrate Spring with Struts *?
Spring framework provides an easy way to manage the dependency. It can be easily integrated with struts 2 framework.
How do I get requests in struts2?
In Struts 2 , you can use the following two methods to get the HttpServletRequest object.
- ServletActionContext. Get the HttpServletRequest object directly from org. apache. struts2. ServletActionContext.
- ServletRequestAware. Make your class implements the org. apache. struts2. interceptor.
What does OGNL stand for?
Object-Graph Navigation Language
OGNL stands for Object-Graph Navigation Language; it is an expression language for getting and setting properties of Java objects, plus other extras such as list projection and selection and lambda expressions. You use the same expression for both getting and setting the value of a property.
What is OGNL console?
console – Shows a popup ‘OGNL Console’ that allows the user to test OGNL expressions against the value stack. The XML data from the xml mode is inserted at the top of the page. command – Tests an OGNL expression and returns the string result.
What is the actioncontext?
The ActionContext is the context in which an Action is executed. Each context is basically a container of objects an action needs for execution like the session, parameters, locale, etc. The ActionContext is thread local which means that values stored in the ActionContext are unique per thread.
Is the actioncontext null for the current thread?
the ActionContext for the current thread, is never null. Gets the context map. the context map. Sets conversion errors which occurred when executing the action. conversionErrors – a Map of errors which occurred when executing the action.
How to get the instance of HttpSession in httpservletrequest?
If we have the instance of HttpServletRequest class, we can call the getSession () method of HttpServletRequest interface to get the instance of HttpSession. For example: We are going to see the full example of this in next topic SessionAware interface.
What are the methods provided by servletactioncontext class?
The commonly used methods provided by ServletActionContext class are as follows: public static HttpServletRequest getRequest () returns the instance of HttpServletRequest.