Transfer data from JAVA to SAP

hi abapgurus,

i have an urgent requirement.

i need to retrieve data from JAVA and create vendors/customers with the data in SAP.

The thing is ,how should i retrieve data from JAVA??

NOTE:--i dont want the java data into excel format.

Can i retrieve the necessary data from JAVA, with ABAP statements??

Should i write a function module, (RFC) to retrieve the data from JAVA or is there any other possibility?

how should i connect the java system and sap system???

plz help me.

thnx,

shivaa.