GetParameter and GetAttribute in the Java EE and corresponding El expressions

Excerpted from http://blog.csdn.net/woshixuye/article/details/8027089

GetParameter

① gets all of the string types. such as xy in http://name.jsp?name=xy

② get parameter values passed by Post/get

③ used for client redirection, such as clicking a link or submitting a button, is used to receive data when using a form or URL redirection value

El expression corresponding to ④: ${param.attribute}

GetAttribute

① Gets the type is Object

② is used for server end multiplicity orientation, that is, the Getter/setter property in Sevlet using the forward function or struts. GetAttribute can only receive the value of the program with SetAttribute.

③session.getattribute () to get session

el expression corresponding to ④: ${attribute}

GetParameter and GetAttribute in the Java EE and corresponding El expressions