1. the faster way to convert project to web service is using the tool as list as above? (means without modify a lot of code)
this is a popular tools & APIs you can found many support and tutorials.
2.The project example already come with user interface(UI), but since I need to convert to webservice, so, i m thinking to modify the code to non UI for webservice using, is it right?
modifying?! maybe you need create you own by using Lime
API (see Go to the online API docs in
http://www.semanticmetadata.net/lire/ and lime wiki).