About HttpServletRequest and HttpServletResponse in Servlets

1. HttpServletRequest

Method	Description
Getattributenames ()	Returns the name collection for all properties of the current request
GetAttribute (String name)	Returns the property value specified by name
GetCookies ()	Returns the cookie sent by the client
GetSession ()	Returns the session associated with the client and returns NULL if no session is assigned to the client
GetSession (Boolean Create)	Returns the session associated with the client and, if no session is assigned to the client, creates a session and returns
GetParameter (String name)	Gets the parameter in the request, which is specified by name
Getparametervalues (String name)	Returns the value of the parameter in the request, which is specified by name
Getcharacterencoding ()	Returns the character encoding of the request
Getcontentlength ()	Returns the effective length of the request body
getInputStream ()	Gets the data in the requested input stream
GetMethod ()	Gets the way the request is sent, such as GET, post
Getparameternames ()	Gets the name of all parameters in the request
Getprotocol ()	Gets the protocol name used by the request
Getreader ()	Gets the data flow of the request body
GETREMOTEADDR ()	Get the IP address of the client
Getremotehost ()	Get the name of the client
getServerName ()	Returns the name of the server that accepted the request
Getserverpath ()	Gets the path of the requested file

Common methods of HttpServletResponse

Method	Description
Addcookie (Cookie cookie)	Adds the specified cookie to the current response
AddHeader (String name,string value)	Adds the specified name and value to the header information of the response
Containsheader (String name)	Returns a Boolean value that determines whether the head of the response is set
Encodeurl (String URL)	Encode the specified URL
Senderror (int SC)	Sends an error to the client using the specified status code
Sendredirect (String location)	Send a temporary response to the client
Setdateheader (String name,long date)	Sets the given name and date to the head of the response
SetHeader (String name,string value)	Sets the given name and value to the head of the response
SetStatus (int SC)	Set the status code for the current response
setContentType (String ContentType)	Set the MIME type of the response

About HttpServletRequest and HttpServletResponse in Servlets