Simple spEL using Annotation

Just like JavaConfig being an alternate way to provide configuration metadata instead of xml files, Annotations can be used in place of xml metadata in spEL as well.

Step 1 : Create the POJOs, Candidate.java and Address.java

File : Candidate.java
 

package com.simpleCodeStuffs.spEL;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component("elCandidate")
public class Candidate {

        @Value("Poorni")
        private String name;

        @Value("27")
        private int age;

        @Value("#{elAddress}")
        private Address addrs;

        @Value("#{elAddress.area}")
        private String area;

        public String getArea() {
                return area;
        }

        public void setArea(String area) {
                this.area = area;
        }

        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 Address getAddrs() {
                return addrs;
        }

        public void setAddrs(Address addrs) {
                this.addrs = addrs;
        }
}

File : Address.java
 

package com.simpleCodeStuffs.spEL;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component("elAddress")
public class Address {

        @Value("22/7")
        private String doorNo;

        @Value("MKM Street")
        private String street;

        @Value("Ambattur")
        private String area;

        public String getArea() {
                return area;
        }

        public void setArea(String area) {
                this.area = area;
        }

        public String getDoorNo() {
                return doorNo;
        }

        public void setDoorNo(String doorNo) {
                this.doorNo = doorNo;
        }

        public String getStreet() {
                return street;
        }

        public void setStreet(String street) {
                this.street = street;
        }
}

Step 2 : Enable auto component scanning in the xml file

File : elBeans.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.simpleCodeStuffs.spEL" />

</beans>

Step 3 : Main class

File : MainClass.java

package com.simpleCodeStuffs.spEL;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainClass {

        public static void main(String[] args) {

                ApplicationContext context = 
                        new ClassPathXmlApplicationContext("elBeans.xml");
                Candidate can = (Candidate) context.getBean("elCandidate");
                Address add = (Address) context.getBean("elAddress");

                System.out.println("Name  : " + can.getName());
                System.out.println("Age  : " + can.getAge());
                System.out.println("Area  : " + can.getArea());
             System.out.println("Address : " + can.getAddrs().getDoorNo());
                System.out.println("t " + add.getStreet());
                System.out.println("t  " + add.getArea());
        }
}