Cheonsu, By definition bean constructors take no arguments. However, you
should be able to use the jsp:setProperty tag in conjunction with the
jsp:useBean tag to do what you want to do.
Say for instance that you have a FooBar class with a constructor that
takes string and date arguments:
public FooBar(String user, Date date)
To make this a bean, you would need to add a constructor with no
arguments (or subclass it, if you don't have the FooBar source code. You
also need to add get/set functions for the init arguments to make them
accessible as properties:
public class FooBarBean extends FooBar {
public FooBarBean() { super(null, null); // default value constructor
}
public String getUser() { return mUser; }
public void setUser(String value) { mUser = value; }
public Date getDate { return mDate; }
public void setDate(Date value) { mDate = value; }
}
Then, in your JSP, you should be able to use code like the following:
<jsp:useBean id="foobar" class="foo.bar.FooBar" scope="request">
<jsp:setProperty name="foobar" property="user" value="me" />
<% foobar.setDate(new Date()); %>" %>
</jsp:useBean>
The code between the useBean open and close tags will be evaluated only
when the bean object is created. I put a scriplet in to set the date,
because I think you can only use setProperty for properties that can be
represented as strings.
Hope this helps. Yours, JonTom
JonTom Kittredge
ITA Software, Inc
Cambridge, Massachusetts
>If i want to initialize Constructor arguments.
>how to use bean tag ?
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