问题： 
请问HttpServletRequest和ServletRequest的区别? 

回答： 

servlet理论上可以处理多种形式的请求响应形式 
http只是其中之一 


所以HttpServletRequest、 HttpServletResponse分别是ServletRequest和ServletResponse的子类 


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参考阅读： 
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HttpServletRequest和ServletRequest都是接口 
HttpServletRequest继承自ServletRequest 
HttpServletRequest比ServletRequest多了一些针对于Http协议的方法。 
如 
getHeader(String name)， 
getMethod() ， 
getSession() 
等等。 
他们对应的实现类： 
javax.servlet.ServletRequestWrapper (implements javax.servlet.ServletRequest) 
javax.servlet.http.HttpServletRequestWrapper (implements javax.servlet.http.HttpServletRequest) 






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引自： 
http://zhidao.baidu.com/question/21720605.html 
http://whoosh.iteye.com/blog/1307518 

文轉：http://lixh1986.iteye.com/blog/1765667

HttpServletRequest和ServletRequest的区别.RP