# Package org.apache.commons.text.io

package org.apache.commons.text.io

`StringSubstitutorReader` is a `Reader` that performs string substitution on a source `Reader` using a `StringSubstitutor`.

Using this Reader avoids reading a whole file into memory as a `String` to perform string substitution, for example, when a Servlet filters a file to a client.

Since:
  1.9

- Related Packages
  Package
  Description
  org.apache.commons.text
  Basic classes for text handling.
- Classes
  Class
  Description
  StringSubstitutorReader
  A `Reader` that performs string substitution on a source `Reader` using a `StringSubstitutor`.