Spring Expression Language – Accessing List Collection [Annotation] | Spring Tutorial

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Spring Expression Language – Accessing List Collection [Annotation] | Spring Tutorial

Spring Expression Language – Accessing List Collection [Annotation] | Spring Tutorial

Spring Expression Language – Accessing List Collection [Annotation] | Spring Tutorial

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0%20http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ram.core</groupId>
    <artifactId>SpringDemo</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>SpringDemo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <spring.version>5.0.5.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <!-- Spring 5 dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>
</project>

AddressInfo.java

package com.ram.model;

import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Component;

@Component("addressInfo")
public class AddressInfo
{

    private List<String> addressList;

    public AddressInfo()
    {
        addressList = new ArrayList<String>();
        addressList.add("B220, East Street, London");
        addressList.add("A220, West Street, London");
        addressList.add("C220, North Street, London");
    }

    public List<String> getAddressList()
    {
        return addressList;
    }

    public void setAddressList(List<String> addressList)
    {
        this.addressList = addressList;
    }

    @Override
    public String toString()
    {
        return "AddressInfo [addressList=" + addressList + "]";
    }

}

Employee.java

package com.ram.model;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component("employee")
public class Employee
{

    @Value("10")
    private int id;

    @Value("Peter")
    private String name;

    @Value("#{addressInfo.addressList[0]}")
    private String firstAddress;

    @Value("#{addressInfo.addressList[1]}")
    private String secondAddress;

    public int getId()
    {
        return id;
    }

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

    public String getName()
    {
        return name;
    }

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

    public String getFirstAddress()
    {
        return firstAddress;
    }

    public void setFirstAddress(String firstAddress)
    {
        this.firstAddress = firstAddress;
    }

    public String getSecondAddress()
    {
        return secondAddress;
    }

    public void setSecondAddress(String secondAddress)
    {
        this.secondAddress = secondAddress;
    }

    @Override
    public String toString()
    {
        return "Employee [id=" + id + ", name=" + name + ", firstAddress="
                + firstAddress + ", secondAddress=" + secondAddress + "]";
    }

}

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-4.3.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <context:component-scan base-package="com.ram" />

</beans>

App.java

package com.ram.core;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ram.model.Employee;
import com.ram.model.AddressInfo;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        System.out.println("---------------------------------------");

        AddressInfo addressInfo = (AddressInfo) context
                .getBean("addressInfo");
        System.out.println(addressInfo+"\n");

        Employee employee = (Employee) context.getBean("employee");
        System.out.println(employee);
    }

}

Output

Sep 15, 2018 10:01:11 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@736e9adb: startup date [Sat Sep 15 10:01:11 IST 2018]; root of context hierarchy
Sep 15, 2018 10:01:11 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
AddressInfo [addressList=[B220, East Street, London, A220, West Street, London, C220, North Street, London]]

Employee [id=10, name=Peter, firstAddress=B220, East Street, London, secondAddress=A220, West Street, London]

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_Spring%20EL_accessing_list-Annotation.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_Spring%20EL_accessing_list-Annotation

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/bc57993ee6a8afd4aea41a3f35b305677f5544e1/Spring_2018/SpringDemo_Spring%20EL_accessing_list-Annotation/?at=master

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