1、Adobe Reader can edit and save Pdf forms,can add signature and barcode;
2、I upload pdf file by web upload or by email or copy files；
3、My back-end system(J2EE,Weblogic or Tomcat) receive pdf files ，then extract XML datas from PDF by SDK(Adoble supply ？).
1、I need buy what productions or modules of LiveCycle ES?
2、Adobe supply SDK of extracting XML datas from PDF?
You need to buy LC Forms for this use case. LC forms contains the API to extract data in XML format from the PDF.
You will also need Reader Extensions for the signature and barcoded forms
Yes of course. Indeed.