How to read values from properties file?

Question

I am using spring. I need to read values from properties file. This is internal properties file not the external properties file. Properties file can be as below.

some.properties ---file name. values are below.

abc = abc
def = dsd
ghi = weds
jil = sdd

I need to read those values from the properties file not in traditional way. How to achieve it? Is there any latest approach with spring 3.0?

Answer 1

Configure PropertyPlaceholder in your context:

<context:property-placeholder location="classpath*:my.properties"/>

Then you refer to the properties in your beans:

@Component
class MyClass {
  @Value("${my.property.name}")
  private String[] myValues;
}

EDIT: updated the code to parse property with mutliple comma-separated values:

my.property.name=aaa,bbb,ccc

If that doesnt work, you can define a bean with properties, inject and process it manually:

<bean id="myProperties"
      class="org.springframework.beans.factory.config.PropertiesFactoryBean">
  <property name="locations">
    <list>
      <value>classpath*:my.properties</value>
    </list>
  </property>
</bean>

and the bean:

@Component
class MyClass {
  @Resource(name="myProperties")
  private Properties myProperties;

  @PostConstruct
  public void init() {
    // do whatever you need with properties
  }
}