18
Jul

Create Bean in Constructor Based with Annotations

Create Bean in Constructor Based with Annotations

Step 1: Create Student.java in entitites package
=================================================

package entities;

public class Student {
	private String id, name;
	private int age;
	private double score;

	public String getId() {
		return id;
	}

	public Student(){
	}

	public Student(String id, String name, int age, double score){
		this.id = id;
		this.name = name;
		this.age = age;
		this.score = score;
	}

	public void setId(String id) {
		this.id = id;
	}

	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;
	}

	public double getScore() {
		return score;
	}

	public void setScore(double score) {
		this.score = score;
	}

}



Step 2: Configuration file:
=============================
package annotations;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import entities.Student;

@Configuration
public class StudentConfigConst {

	@Bean(name = "student1")
	public Student student1() {
		return new Student("st01", "student name", 24, 7.6);
	}

}





Step 3: Client application
===========================

package entities;

import entities.Student;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;

import annotations.StudentConfigConst;

public class MainConstructorAnnotations {

	public static void main(String[] args) {
		try {
			AbstractApplicationContext context = new AnnotationConfigApplicationContext(StudentConfigConst.class);

			Student student1 = (Student) context.getBean("student1");

			System.out.println("Student data from beans ");

			System.out.println("Id  " + student1.getId());
			System.out.println("Name" + student1.getName());
			System.out.println("Age  " + student1.getAge());
			System.out.println("Score" + student1.getScore());

			context.close();

		} catch (Exception e) {
			System.out.println(e.getMessage());
		}

	}

}



output:
=========

Student data from beans 
Id  st01
Namestudent name
Age  24
Score7.6