Programmatic access to properties created by property-placeholder

Question

I\'m reading properties file using context:property-placeholder. How can I access them programatically (@Value doesn\'t work - I d

Answer 1

@Value

annotation works on new releases of Spring (tested on v3.2.2) Here is how it is done:

1. Map your properties file in spring configuration file

2. Create app-config.properties inside (root) your source folder

   my.property=test
   my.property2=test2
   

3. Create a controller class

   @Controller
   public class XRDSBuilder
   {
       @Value("${my.property}")
       private String myProperty;
   
       public String getMyProperty() { return myProperty; }
   }
   

Spring will automatically map the content of my.property to your variable inside the controller

Mapping to a list

Property value:

my.list.property=test,test2,test3

Controller class configuration:

@Value("#{'${my.list.property}'.split(',')}")
private List myListProperty;

Advanced mapping

@Component("PropertySplitter")
public class PropertySplitter {

    /**
     * Example: one.example.property = KEY1:VALUE1,KEY2:VALUE2
     */
    public Map map(String property) {
        return this.map(property, ",");
    }

    /**
     * Example: one.example.property = KEY1:VALUE1.1,VALUE1.2;KEY2:VALUE2.1,VALUE2.2
     */
    public Map> mapOfList(String property) {
        Map map = this.map(property, ";");

        Map> mapOfList = new HashMap<>();
        for (Entry entry : map.entrySet()) {
            mapOfList.put(entry.getKey(), this.list(entry.getValue()));
        }

        return mapOfList;
    }

    /**
     * Example: one.example.property = VALUE1,VALUE2,VALUE3,VALUE4
     */
    public List list(String property) {
        return this.list(property, ",");
    }

    /**
     * Example: one.example.property = VALUE1.1,VALUE1.2;VALUE2.1,VALUE2.2
     */
    public List> groupedList(String property) {
        List unGroupedList = this.list(property, ";");

        List> groupedList = new ArrayList<>();
        for (String group : unGroupedList) {
            groupedList.add(this.list(group));
        }

        return groupedList;

    }

    private List list(String property, String splitter) {
        return Splitter.on(splitter).omitEmptyStrings().trimResults().splitToList(property);
    }

    private Map map(String property, String splitter) {
        return Splitter.on(splitter).omitEmptyStrings().trimResults().withKeyValueSeparator(":").split(property);
    }
}

Property value:

my.complex.property=test1:value1,test2:value2

Controller class:

@Value("#{PropertySplitter.map('${my.complex.property}')}")
Map myComplexProperty;