To write messages to the file system you can use a FileWritingMessageHandler . This class can deal with File or byte[] payloads and otherwise invokes the toString() method on the payload to establish the contents of the File. In its simplest form the FileWritingMessageHandler just needs a parent directory for the files.

Additionally, you can configure the encoding and the charset that will be used in case of a fallback on the toString() method.

To make things easier you can configure the FileWritingMessageHandler as part of an outbound channel adapter using the namespace.

<file:outbound-channel-adapter id="filesOut" directory="file:${input.directory.property}"/>

If you have more elaborate requirements to the payload to file conversion you could extend the FileWritingMessageHandler, but a much better option is to rely on a Transformer