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  • jsp:useBean

    The jsp:useBean Action This action load in a JavaBean to be used in the JSP page. The simplest syntax for specifying that a bean should be used is:

    <jsp:useBean id="name" class="package.class" />
    This usually means "instantiate an object of the class specified by class, and bind it to a variable with the name specified by id." You can specify a scope attribute that makes the bean associated with more than just the current page. In that case, it is useful to obtain references to existing beans, and the jsp:useBean action specifies that a new object is instantiated only if there is no existing one with the same id and scope. Now, once you have a bean,you can modify its properties via jsp:setProperty, or by using a scriptlet and calling a method explicitly on the object with the variable name specified earlier via the id attribute. You read existing properties in a JSP expression or scriptlet by calling the appropriate getYYY method, or more commonly, by using the jsp:getProperty action.

    Here is a very simple example that loads a bean and sets/gets a simple String parameter.


    <TITLE> JavaBeans in JSP</TITLE>
    <jsp:useBean id="test" class="com.EmpBean" />
    <jsp:setProperty name="test" property="name" value="Das" />

    Name is : <jsp:getProperty name="test" property="name" />
    Output is :
    Name is : Das

    Here's the source code for the bean used in the test.jsp page. package com;
    public class EmpBean {
    private String name = "";
    public String getName() {
    return name;
    public void setName(String name) { = name;
    The below code
    <jsp:useBean id="test" class="com.EmpBean" />
    is equivalent to
    com.EmpBean test = new com.EmpBean();
    <jsp:setProperty name="test" property="name" value="Das" />
    is equivalent to
    test.setName("Das"); and
    <jsp:getProperty name="test" property="name" />
    is equivalent to

    Atribute Usage
    id Gives a name to the variable that will reference the bean. A previous bean object is used instead of instantiating a new one if one can be found with the same id and scope.
    class Designates the full package name of the bean.
    scope Indicates the context in which the bean should be made available. There are four possible values: page, request, session, and application. The default, page, indicates that the bean is only available on the current page (stored in the PageContext of the current page). A value of request indicates that the bean is only available for the current client request (stored in the ServletRequest object). A value of session indicates that the object is available to all pages during the life of the current HttpSession. Finally, a value of application indicates that it is available to all pages that share the same ServletContext. The reason that the scope matters is that a jsp:useBean entry will only result in a new object being instantiated if there is no previous object with the same id and scope. Otherwise the previously existing object is used, and any jsp:setParameter elements or other entries between the jsp:useBean start and end tags will be ignored.
    type Specifies the type of the variable that will refer to the object. This must match the classname or be a superclass or an interface that the class implements. Remember that the name of the variable is designated via the id attribute.
    beanName Gives the name of the bean, as you would supply it to the instantiate method of Beans. It is permissible to supply a type and a beanName, and omit the class attribute.

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