Access properties file programmatically with Spring?

Question

We use the code below to inject Spring beans with properties from a properties file.

Answer 1

CREDIT: Programmatic access to properties in Spring without re-reading the properties file

I've found a nice implementation of accessing the properties programmatically in spring without reloading the same properties that spring has already loaded. [Also, It is not required to hardcode the property file location in the source]

With these changes, the code looks cleaner & more maintainable.

The concept is pretty simple. Just extend the spring default property placeholder (PropertyPlaceholderConfigurer) and capture the properties it loads in the local variable

public class SpringPropertiesUtil extends PropertyPlaceholderConfigurer {

    private static Map propertiesMap;
    // Default as in PropertyPlaceholderConfigurer
    private int springSystemPropertiesMode = SYSTEM_PROPERTIES_MODE_FALLBACK;

    @Override
    public void setSystemPropertiesMode(int systemPropertiesMode) {
        super.setSystemPropertiesMode(systemPropertiesMode);
        springSystemPropertiesMode = systemPropertiesMode;
    }

    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
        super.processProperties(beanFactory, props);

        propertiesMap = new HashMap();
        for (Object key : props.keySet()) {
            String keyStr = key.toString();
            String valueStr = resolvePlaceholder(keyStr, props, springSystemPropertiesMode);
            propertiesMap.put(keyStr, valueStr);
        }
    }

    public static String getProperty(String name) {
        return propertiesMap.get(name).toString();
    }

}

Usage Example

SpringPropertiesUtil.getProperty("myProperty")

Spring configuration changes

    
    
    
        classpath:myproperties.properties
    
    

Hope this helps to solve the problems you have