how to use <bean:write > tag in strut 1.2?

Question

How to Use <bean:write> tag in Struts 1.2.

In name attribute, what value have to be used? Is bean name your property name?

Solution 1

Javadoc for <bean:write>:

Specifies the attribute name of the bean whose property is accessed to retrieve the value specified by property (if specified). If property is not specified, the value of this bean itself will be rendered.

In essence, if you have a JavaBean (with getters and setters),

Person person = new Person;
request.setAttribute("person", person);

by setting <bean:write name="person" property="age" />, you're telling Struts to first find person object first from PageContext scope. If not found, then request, then session, then application scope.

The property="age" attribute (from <bean:write /> tag), will then call the getter method getAge() from the Person object (irrespective of whether there's an instance variable called age on the bean).

Hope this helps.

Solution 2

In order to display person.getAge() you would use

<bean:write name="person" property="age" />

Comments

[Vlad]

+1 for detailed explanation -1 for confusing a bit the scope lookup order: it's page, request, session then application

[Buhake Sindi]

@Vlad, thanks for finding my mistake. I've edited to fix the errors.

[Arun]

THanks for explaining :) +1 for Explanation

[aman_novice]

now, in case if i want to use "age" property again, how will i retrieve the value? Is that possible? My scenario is, on click of button b1, i fetch certain value, let us say "age" and populate it on the jsp page using <bean:write name="person" property="age"/> If I press another button b2, I am not able to get the value from this age property. form.getAge() returns null where 'form' is of type Person.