如何在 Spring 启动 Maven 项目中移动 application.properties 或执行外部属性

Question

So i was develop some application in Spring Boot, but i get stumbled upon application.properties file, i want to make it easier to use, cause i have some environment to test, like Dev, Uat and Production

When i want to launch the app, i build it using mvn clean install with application.properties profile on the environment. cause my app only using war snapshot for backend service.

like when i want to launch in dev

spring.profiles.active=dev

or when i want to deploy it in uat environment i'm using

spring.profiles.active=uat

is there a way to make it easier, like using external prop, so i don't need using application.properties anymore, cause i'll upload application.properties in each of my environment, so the app can read from external properties.

i already tried PropertySourcePlaceholderConfigurer, but no luck

@Configuration
public class ExternalPropertyConfig {

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
    final PropertySourcesPlaceholderConfigurer properties = new PropertySourcesPlaceholderConfigurer();

    Resource[] resources = new Resource[ ] {

    new FileSystemResource("/myth/app/data/weblogic_configuration/config/myth_uat_configuration.properties"),
    new FileSystemResource("/myth/app/data/weblogic_configuration/config/myth_dev_configuration.properties"),
    new FileSystemResource("/src/main/resources/myth_local_configuration.properties")
    };

    properties.setLocations( resources );
    properties.setIgnoreResourceNotFound(true);
    properties.setIgnoreUnresolvablePlaceholders(true);
    return properties;
    }
}

Answer 1

After building the jar you can launch it like this

java -jar -Dspring.profiles.active=dev "app.jar"

and providing the active profile will make that particular profile take effect

You just create the profile scoped properties file like application-dev.properties or application-prod.properties

They are automatically loaded. No need for code to load them

You can have a look at this Spring Boot Features

Answer 2

you can load properties using xml configuration as below:

<bean id="configProperties"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="systemPropertiesMode" value="2" />
        <property name="locations">
            <list>
                <value>classpath:db.properties</value>
                <value>classpath:nosql.properties</value>
                <value>classpath:api.properties</value>
            </list>
        </property>
</bean>

After this you can use property spring.profiles.active defined in any of your properties file (any of db.properties , nosql.properties or api.properties ) in your code ->

@Service("bean")
public class Bean {
    @Value("${spring.profiles.active}")
    private String profile;
}

Answer 3

I think this is what you are looking for Spring boot YML doc . Generally externalizing the config is achieved through ymls.