Part 2 - JavaBean using Expression Language | JSP (Java Server Pages) Certification Training| Uplat

In this JSP session by Uplatz, the instructor explains the concept of JavaBean using Expression Language. This is part-2 of the two part series. https://training.uplatz.com/online-it-course.php?id=jsp-java-server-pages-199

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In Java web development, a JavaBean is a simple Java class that follows certain conventions to encapsulate data and provide access to it through getters and setters. JavaBeans are commonly used in web applications to store and manage data that can be easily accessed by JavaServer Pages (JSP) using Expression Language (EL).

To create a JavaBean and use it with Expression Language in a JSP, follow these steps:

Step 1: Create a JavaBean class:
Create a simple Java class with private member variables, public getters, and setters for each variable.
public class Person {
private String name;
private int age;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}
}

Step 2: Place the JavaBean in the correct scope:
In a web application, you can place the JavaBean instance in a scope that allows access from the JSP page. Common scopes are the request scope, session scope, and application scope.
For example, in a Servlet, you can create and set the JavaBean instance in the request scope like this:
public class MyServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Person person = new Person();
person.setName("John Doe");
person.setAge(30);
request.setAttribute("person", person);
RequestDispatcher dispatcher = request.getRequestDispatcher("mypage.jsp");
dispatcher.forward(request, response);
}
}

Step 3: Access the JavaBean using Expression Language in JSP:
Now, in your JSP file (mypage.jsp), you can use Expression Language to access the JavaBean and its properties without Java code.

!DOCTYPE html
html
head
title JavaBean Example /title
/head
body
h1 Hello, ${person.name}! /h1
p Your age is ${person.age}. /p
/body
/html

In the JSP, ${person.name} and ${person.age} are EL expressions that access the properties of the JavaBean person set in the request scope. Expression Language automatically calls the appropriate getters to retrieve the values.

Using Expression Language with JavaBeans in JSPs helps in keeping the code concise and promotes the separation of concerns by reducing the amount of Java code directly embedded in the presentation layer.

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#jsp #java #servlets