Reading a List from properties file and load with Spring annotation @Value

Reading a List from properties file and load with Spring annotation @Value

To read a list of values from a properties file and load it using the Spring @Value annotation, you can follow these steps:

  • Create a properties file (e.g., myapp.properties) containing the list of values:
myapp.values=foo,bar,baz
  • Configure a property source in your Spring application context to load the properties file. You can do this in your Spring configuration class using the @PropertySource annotation:
import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; @Configuration @PropertySource("classpath:myapp.properties") public class AppConfig { // Configuration class definition }

Make sure to place the myapp.properties file in the classpath so that Spring can find and load it.

  • In your Spring component or bean where you want to use the list, use the @Value annotation to inject the list as a String and then convert it to a List<String> using Java code.
import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; import java.util.Arrays; import java.util.List; @Component public class MyComponent { @Value("${myapp.values}") private String valuesString; public List<String> getValuesList() { return Arrays.asList(valuesString.split(",")); } }

In this example, we inject the comma-separated string from the properties file into the valuesString field using @Value. We then split this string into a List<String> using Arrays.asList().

  • Now, you can use MyComponent to access the list of values:
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service public class MyService { private final MyComponent myComponent; @Autowired public MyService(MyComponent myComponent) { this.myComponent = myComponent; } public List<String> getValues() { return myComponent.getValuesList(); } }

With this setup, you can inject and use the list of values in your Spring components or services. When you call getValues() on MyService, it will return the list of values read from the properties file.

Remember to add the necessary Spring configuration to your project (e.g., @ComponentScan, @SpringBootApplication, or XML configuration) to enable Spring component scanning and to ensure that your components are correctly wired and initialized.

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