How to inject a Map using the @Value Spring Annotation?

You can inject values into a Map from the properties file using the @Value annotation like this.

The property in the properties file.

propertyname={key1:'value1',key2:'value2',....}

In your code.

@Value("#{${propertyname}}")  private Map<String,String> propertyname;

Note the hashtag as part of the annotation.

I believe Spring Boot supports loading properties maps out of the box with @ConfigurationProperties annotation.

According that docs you can load properties:

my.servers[0]=dev.bar.commy.servers[1]=foo.bar.com

into bean like this:

@ConfigurationProperties(prefix="my")public class Config {    private List<String> servers = new ArrayList<String>();    public List<String> getServers() {        return this.servers;    }}

I used @ConfigurationProperties feature before, but without loading into map. You need to use @EnableConfigurationProperties annotation to enable this feature.

Cool stuff about this feature is that you can validate your properties.

You can inject .properties as a map in your class using @Resource annotation.

If you are working with XML based configuration, then add below bean in your spring configuration file:

 <bean id="myProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">      <property name="location" value="classpath:your.properties"/> </bean>

For, Annotation based:

@Bean(name = "myProperties")public static PropertiesFactoryBean mapper() {        PropertiesFactoryBean bean = new PropertiesFactoryBean();        bean.setLocation(new ClassPathResource(                "your.properties"));        return bean;}

Then you can pick them up in your application as a Map:

@Resource(name = "myProperties")private Map<String, String> myProperties;