Read and Write the Payload using SAP PI Java Mapping

JM_ReadWritePayload_PI.java

public void transform(TransformationInput arg0, TransformationOutput arg1) throws StreamTransformationException {
    try {
	InputStream in = arg0.getInputPayload().getInputStream();
	OutputStream out = arg1.getOutputPayload().getOutputStream();
	int buffer;

	//Read and Write back the file
	while ((buffer = in.read()) != -1)
	{
		out.write(buffer);
	}
	out.flush();
    }catch (Exception e) {
           throw new StreamTransformationException(e.getMessage());
    }
}