Question

I have a class that looks like following.

Class Parser{
  private String fileName;
  Parser(String fileName){
    this.fileName = fileName;
  }
}

Now I want to instantiate this class using Spring but problem is that fileName here is not constant. It is of following format FileToBeParsed_<ddMMyyyy> where ddMMyyyy is current date time(whenever instantiation happens).

So I was thinking of writing a utility method to generate correct filename but how do I inject it in constructor?

Also is it a good practice to create beans of third party/library/JDK classes in your spring configuration.

Thanks

Answer 1

Assuming you’re using a version of spring that supports spring EL, then this should work for you:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean name="sdf" class="java.text.SimpleDateFormat">
        <constructor-arg value="yyyy/MM/dd" />
    </bean>

    <bean name="parser" class="sandbox.Parser">
        <constructor-arg value="#{sdf.format(new java.util.Date())}" />
    </bean>
</beans>