JAVA EE: Spring Expression Language – Accessing Map[key is String]

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Spring Expression Language – Accessing Map[key is String] | 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.LinkedHashMap;

import java.util.Map;

import org.springframework.stereotype.Component;

@Component("addressInfo")

public class AddressInfo

{

    private Map<String, String> addressMap;

    public AddressInfo()

    {

        addressMap = new LinkedHashMap<String, String>();

        addressMap.put("East", "B220-East Street-London");

        addressMap.put("West", "A220-West Street-London");

        addressMap.put("North", "C220-North Street-London");

    }

    public Map<String, String> getAddressMap()

    {

        return addressMap;

    }

    public void setAddressMap(Map<String, String> addressMap)

    {

        this.addressMap = addressMap;

    }

    @Override

    public String toString()

    {

        return "AddressInfo [addressMap=" + addressMap + "]";

    }

}

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.addressMap['West']}")

    private String westAddress;

    @Value("#{addressInfo.addressMap['North']}")

    private String northAddress;

    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 getWestAddress()

    {

        return westAddress;

    }

    public void setWestAddress(String westAddress)

    {

        this.westAddress = westAddress;

    }

    public String getNorthAddress()

    {

        return northAddress;

    }

    public void setNorthAddress(String northAddress)

    {

        this.northAddress = northAddress;

    }

    @Override

    public String toString()

    {

        return "Employee [id=" + id + ", name=" + name + ", westAddress="

                + westAddress + ", northAddress=" + northAddress + "]";

    }

}

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 18, 2018 9:44:54 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@45ff54e6: startup date [Tue Sep 18 09:44:54 IST 2018]; root of context hierarchy

Sep 18, 2018 9:44:54 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

---------------------------------------

AddressInfo [addressMap={East=B220-East Street-London, West=A220-West Street-London, North=C220-North Street-London}]

Employee [id=10, name=Peter, westAddress=A220-West Street-London, northAddress=C220-North Street-London]