HttpServletRequest and HttpServletResponse detailed

Recently due to the re-encapsulation of CAS-related jar packages, I want to do as much as possible 0 configuration, and this process a lot to make

Use HttpServletRequest, now tidy up as follows, for later inspection. (The table is copied from other places, the layout is a bit of slag, paid to see it.) ）

There are very many classes and interfaces related to the request response, and the following table is the primary class and interface related to the request and interface.

Main classes and interfaces related to requests and interfaces

Method	Description
ServletInputStream	Input stream of the servlet
Servletoutputstream	Output stream of the servlet
ServletRequest	Represents an interface requested by a servlet
Servletresponse	An interface representing the servlet response
Servletrequestwrapper	This class implements the ServletRequest interface
Servletresponsewrapper	This class implements the Servletresponse interface
HttpServletRequest	Inherits the ServletRequest interface, which represents the HTTP request
HttpServletResponse	Inherits the Servletresponse interface, which represents the HTTP request
Httpservletrequestwrapper	The realization of HttpServletRequest
Httpservletresponsewrapper	The realization of HttpServletResponse

The most important of the classes and interfaces given above are the httpservletrequest and HttpServletResponse interfaces, which are described in detail below.

1. HttpServletRequest

The most common method for HttpServletRequest interfaces is to obtain the parameters in the request, which are typically data in the client form. At the same time, the HttpServletRequest interface can get the name delivered by the client, the server-side hostname and IP address that generated the request and receives the request, as well as information such as the communication protocol that the client is using. The following table is a common method for interface HttpServletRequest.

Description: The HttpServletRequest interface provides a number of methods.

Common methods of Interface 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

2. HttpServletResponse

In a servlet, the HttpServletResponse interface is used when the server responds to a request from the client. You can use the setContentType () method to set the type of response. Send character data, you can use Getwriter () to return an object. The following table is a common method for interface HttpServletResponse.

Common methods of Interface 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

HttpServletRequest and HttpServletResponse detailed