In jsf if we want to get a substring from a string then we can write a converter.

This converter has two types of methods one returns an object and another one returns a string.

To use a converter we need to use the following lines of code into faces config file.

<!-- Declaring an id for the converter -->

<converter>

      <converter-id>converterId</converter-id> <-- This is converter id that will be used with component.

      <converter-class>Fully.Qualified.Class.Name.SubstringConverter</converter-class>

</converter>

<!---- How to use converter with the defined id -- >

<h:outputText value="#{beanName.property}" converter="converterId" />