Accessing Map and List attributes in spEL

Step 1 :Create the POJO

The bean is defined using @Component annotation. The values of the Map and List are set in the constructor.
File : Bean.java

package com.simpleCodeStuffs.spEL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Component;
@Component("testBean")
public class Bean {

        private Map<String, String> name;

        private List<Integer> price;

        public Bean() {

                name = new HashMap<String, String>();
                name.put("a", "Sandy");
                name.put("b", "Poorni");
                name.put("c", "Gokul");
                price = new ArrayList<Integer>();
                price.add(150);
                price.add(200);
                price.add(570);
        }

        public Map<String, String> getName() {
                return name;
        }

        public void setName(Map<String, String> name) {
                this.name = name;
        }

        public List<Integer> getPrice() {
                return price;
        }

        public void setPrice(List<Integer> price) {
                this.price = price;
        }
}

Notice how values are injected using spEL in the below class
File : Customer.java

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

        @Value("#{testBean.name['c']}")
        private String name;

        @Value("#{testBean.price[0]}")
        private double bill;

        public String getName() {
                return name;
        }

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

        public double getBill() {
                return bill;
        }

        public void setBill(double bill) {
                this.bill = bill;
        }
}

In case of MAP {#beanID.<propertyName>[‘MapIndex’]} In case of List {#beanID.<propertyName>[indexValue]}

 

Step 2 : Create the 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");
                Customer customer = (Customer) context.getBean("cust");
                
                System.out.println("Customer name: " + customer.getName());
                System.out.println("Bill price : " + customer.getBill());
        }
}

Step 3 :

Note that the values are accessed using annotations in this example. So, do not provide values in the xml as well, as the values provided in xml usually override the values provided through annotations.

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" />
        <bean id="cust" class="com.simpleCodeStuffs.spEL.Customer">
        </bean>
</beans>