Some of my blog visitor asking about how is the connection string if I am using SAProuter to connect from SAPGUI for Java (http://basishowto.blogspot.com/2008/09/installation-and-configuration-of.html).
Actually, it's simple and the same one.
For connection string, you can add this :
conn = /H/[IP_Address_of_your_SAPRouter]/S/3299/H/[IP_Address_of_your_SAP_Server]/S/32[Your_SAP_Server_System_Number]
Remember that IP Address of your SAPRouter is your Public IP which is widely known from the internet and 3299 is the default port of SAPRouter.
Hopefully, that this would help you.