The type javax.servlet.http.HttpServletRequest cannot be resolved.

The type javax.servlet.http.HttpServletRequest cannot be 
resolved. 
如果在MyEclipse中遇到这种情况,也就是HttpServletRequest报红叉的时候,这样做
1、右键工程找到build path项
2、找到Add Libraries
3、点击myEclipse Libraries,Next
4、添加JavaEE 5
OK

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转载自sunyongce.iteye.com/blog/1898307