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Spring spel bean reference tutorial


Spring SpEL Bean Reference:

Spring spel provides the facility to refer a bean and nested properties using a dot (.) symbol.

Syntax:

#{beanName.propertyName}

Example:

Address.java

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
 
@Component("addressBean")
public class Address {
	@Value("Sec-A")
	private String street;
	@Value("122001")
	private int postcode;
	@Value("India")
	private String country;
 
	public String getStreet() {
		return street;
	}
	public void setStreet(String street) {
		this.street = street;
	}
	public int getPostcode() {
		return postcode;
	}
	public void setPostcode(int postcode) {
		this.postcode = postcode;
	}
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}
}

Student.java

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
 
@Component("studentBean")
public class Student {
	@Value("Jai")
	private String name;	
 
	@Value("#{addressBean.street}")
	private String street;
 
	@Value("#{addressBean.country}")
	private String country;
 
	@Value("#{addressBean.postcode}")
	private String postcode;
 
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
 
	public String getStreet() {
		return street;
	}
	public void setStreet(String street) {
		this.street = street;
	}
 
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}
 
	public String getPostcode() {
		return postcode;
	}
	public void setPostcode(String postcode) {
		this.postcode = postcode;
	}	
 
}

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xmlns:context="http://www.springframework.org/schema/context"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-3.0.xsd">
 
 <context:component-scan base-package="com.codesjava.business" />
 
</beans>

Test.java

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
/**
 * Spring SPEL bean reference example.
 * @author codesjava
 */
public class Test {
   public static void main(String args[]){	
	 //Get application context object.
	 ApplicationContext context = 
	   new ClassPathXmlApplicationContext("applicationContext.xml");
 
	 //Get studentBean.
	 Student student = (Student) context.getBean("studentBean");
 
	 //Print student properties.
	 System.out.println("Name: "+student.getName()); 
	 System.out.println("Street: "+student.getStreet()); 
	 System.out.println("Postal: "+student.getPostcode()); 
  	 System.out.println("Country: "+student.getCountry()); 
   }
}

Output:

Name: Jai
Street: Sec-A
Postal: 122001
Country: India

 
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