Servlet equivalent to <jsp:useBean ../>

[C Vivek]

<jsp:useBean id="obj" scope="session" class="classname"/>
<%=obj.display()%>

Please could you tell me what Servlet equivalent is for the above code?

Regards,
Vivek

[Bear Bibeault]

Create an instance of the class, set it into session scope.

<jsp:useBean> also has some semantics around checking whether the bean already exists or not.

You could also look at the generated JSP code to see how the action is implemented.

[kranthi adari]

You have to import the class using page directive
<%@page import="complete class path">

and then create an instance of the bean and add it to the session using setAttribute() method.

[Bear Bibeault]

kranthi adari wrote:You have to import the class using page directive
<%@page import="complete class path">

That makes no sense in the context of a servlet.

[kranthi adari]

In a servlet, you cannot use page-directive, Sorry. Please find my steps below to implement <jsp:usebean> equivalent in servlet.

Import the bean using import <bean-path>
and then create a session object
HttpSevletSession sesssion = request.getSession();
Now create a bean object
MyBean b = new MyBean();
set the data of the bean and then add to the session.
session.setAttribute("bean, b);

[Steve Luke]

kranthi adari wrote:In a servlet, you cannot use page-directive, Sorry. Please find my steps below to implement <jsp:usebean> equivalent in servlet.

Import the bean using import <bean-path>
and then create a session object
HttpSevletSession sesssion = request.getSession();
Now create a bean object
MyBean b = new MyBean();
set the data of the bean and then add to the session.
session.setAttribute("bean, b);

This makes the assumption that the variable does not already exist in the scope defined. The jsp:useBean first checks to see if the variable does not exist before making the new object. The most similar code would be:

MyBean myBean = session.getAttribute("myBean");
if (myBean != null) {
    myBean = new MyBean();
    session.setAttribute("myBean", myBean);
}

That assumes the scope being looked at is the session, replace the intended scope as needed.

[Ben Souther]

MyBean myBean = session.getAttribute("myBean");
if (myBean != null) {
    myBean = new MyBean();
    session.setAttribute("myBean", myBean);
}

I assume you meant

if(myBean == null)

[Steve Luke]

Ben Souther wrote:

MyBean myBean = session.getAttribute("myBean");
if (myBean != null) {
    myBean = new MyBean();
    session.setAttribute("myBean", myBean);
}

I assume you meant

if(myBean == null)

Doh, yeah.

[C Vivek]

Thanks guys!