大体完成CommentService
修改CommentService
Merge branch 'master' of https://github.com/huangtao800/comparePrice.git

Conflicts:
	comparePrice/src/edu/nju/comparePrice/services/CommentService.java
Merge branch 'master' of https://github.com/huangtao800/comparePrice.git
修改了CommentService
Merge branch 'master' of https://github.com/huangtao800/comparePrice.git