Spring Expression Language – Accessing Map[key is String] | Spring Tutorial

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Spring Expression Language – Accessing Map[key is String] | Spring Tutorial

Spring Expression Language – Accessing Map[key is String] | Spring Tutorial

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]

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

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

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/41b19a6ea5ff82d0f409d467c69dd68cdbbf4a93/Spring_2018/SpringDemo_Spring%20EL_accessing_Map_Key_String/?at=master

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