Common methods of ServletRequest-----servletresponse

getattribute (String name): Returns the value of the attribute with name, no return null exists

getattributenames (): Returns all the available property names in the request, without attributes, returning an empty enumeration collection

removeattribute (String name): Removes the property named name in the request

SetAttribute (String name, Object o): Request to save the property named Name, the second parameter is NULL, then it is equivalent to RemoveAttribute.

getcharacterencoding (): The character encoding set used by the request body. Returns NULL if none is specified

Getcontexttype (): The MIME type of the request body. Do not know return null

getInputStream (): Returns an input stream

getparameter (String name): Returns the value of the name parameter in the request, and returns the first value if there are multiple values.

getparameternames (): The name of all parameters contained in the request. Without a request parameter, returns an empty enumeration collection.

getparametervalues (String name): Returns all values of the name parameter.

Common methods of ServletRequest-----servletresponse