request的getAttribute与getParameter的区别

request.getAttribute():是request时设置的变量的值,用request.setAttribute( "name ", "您自己的值 ");来设置值,
request.getParameter():提取发送过来的参数如:本网页
http://community.csdn.net/Expert/topic/4633/4633804.xml?temp=.3488123
request.getParameter( "temp ")== ".3488123 "


request.getParameter
是用来接受来自get方法或post方法的参数
<form method=post>
<form method=get>
<a href= "1.jsp?id=1 "> ok </a>
只能接受java.lang.String
也就是说String hotel_id = request.getParameter( "hotel_id ");
request.getAttribute
是用来接受来自servlet的变量或Action(其实Action就是特殊的Servlet)
在Action中，request.setAttribute( "ret ",ret);
只能接受java.lang.Object
也就是说List ret = (List)request.getAttribute( "ret ");