EL and Complex Java Beans
EL means the expression language , it makes it possible
to easily access application data stored in JavaBeans components. The jsp
expression language allows a page author to access a bean using simple syntax
such as $(name). Before JSP 2.0, we could use only a scriptlet,
JSP expression, or a custom tag to include server state in the jsp page output.
Using scripting in jsp all the time makes the program difficult to understand as
it grows bigger in size. Expression Language (EL) was first introduced in JSTL 1.0.
EL provides us a way to access the java code. EL is such a language which
is liked by java programmers as well as by those who are not programmers like
designers.
Java Beans: They are platform- independent
component and usable software programs which you can use develop and assemble
easily to create complex applications. JavaBean are also known as beans. Beans
are called dynamic as they can be easily customized or changed.
In this example we have created one bean class
consisting only of setter and getter method. These setter and getter method will
be used in the jsp. To set the value in a jsp page use <jsp:setProperty>
standard tag. We are using the EL to retrieve the value of the bean.
The code of the of the program is given below:
public class ComplexJavaBeans{
private String name;
private int age;
private String address;
private int phone;
public void setName(String name){
this.name = name;
}
public String getName(){
return name;
}
public void setAge(int age){
this.age = age;
}
public int getAge(){
return age;
}
public void setAddress(String address){
this.address = address;
}
public String getAddress(){
return address;
}
public void setPhone(int phone){
this.phone = phone;
}
public int getPhone(){
return phone;
}
} |
<jsp:useBean id="person" class="Mybean.ComplexJavaBeans"
scope="request" />
<jsp:setProperty name = "person" property =
"name" value = "James"/>
<jsp:setProperty name = "person" property =
"age" value = "35"/>
<jsp:setProperty name = "person" property =
"address" value = "007,Colony No.2"/>
<jsp:setProperty name = "person" property =
"phone" value = "1234567890"/>
<html>
<body>
<h1>EL and Complex JavaBeans</h1>
<table border="1">
<tr>
<td>${person.name}</td>
<td>${person.age}</td>
<td>${person.address}</td>
<td>${person.phone}</td>
</tr>
</table>
</body>
</html> |
The output of the program is given below:
Download this
example.
|
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