Java HttpServletRequest and HttpServletResponse

This article is mainly about the Java HttpServletRequest and httpservletresponse details of the relevant information, the need for friends can participate in the test

Java HttpServletRequest and HttpServletResponse

Recently, the CAS-related jar package was re-encapsulated, so I wanted to do the 0 configuration as much as possible, and this process

Use HttpServletRequest, now tidy up as follows, so as to check later. (The form is made from somewhere else, and the typesetting slag is understood, paid.) ）

Please be very much related to the type and interface, the following table is the main and the sum interface related to the interface.

The main and the interface of the sum interface

Servletresponsewrapper

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Method	Say
ServletInputStream	Servlet Input stream
Servletoutputstream	servlet output flow
SERVL Etrequest	Represents an interface for a servlet
Servletresponse	On behalf of the servlet An interface
Servletrequestwrapper	ServletRequest interface
The category Servletresponse interface
httpservletrequest	Continue to understand ServletRequest interface, HTTP request
HttpServletResponse	Serv Letresponse interface, representing HTTP please
Httpservletrequestwrapper	HttpServletRequest /p>
Httpservletresponsewrapper	HttpServletResponse The fact that

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 usually the numbers in the client's list. At the same time, the HttpServletRequest interface can be received by the client to send the name, you can obtain the product request and receive the request of the server terminal host name and IP address, but also to obtain the customer correct in the use of communication protocol and other information. The following table is a common method for interface HttpServletRequest.

Stating: The HttpServletRequest interface provides a good understanding of the methods.

Common methods of Interface HttpServletRequest

Method	Explain
Getattributenames ()	Returns a collection of all of the names of the previous requests
GetAttribute (String name)	Returns the value specified by name
GetCookies ()	Returns the cookie sent by client
GetSession ()	Returns the session with the client retransmitting, or returns NULL if no session is assigned to the client
GetSession (Boolean Create)	Return and client retransmitting session, create a session and return if no session is assigned to the client
GetParameter (String name)	To obtain the parameters of the request, the parameters are specified by name
Getparametervalues (String name)	Returns the value of the request, which is specified by name
Getcharacterencoding ()	Return to the request for the word Fu Yi password method
Getcontentlength ()	Returns the effective length of the request
getInputStream ()	Access to the numbers in the input of the request
GetMethod ()	To obtain the means of sending requests, such as GET, post
Getparameternames ()	Get the names of all the parameters in the request
Getprotocol ()	The name of the agreement used to obtain the request
Getreader ()	To obtain the flow of the request
GETREMOTEADDR ()	Access the client IP address
Getremotehost ()	Get the name of the client
getServerName ()	Returns the name of the server that accepted the request
Getserverpath ()	The path of the file to be obtained

2. HttpServletResponse

In a servlet, the HttpServletResponse interface is used when the server responds to a request from the client. The setContentType () method can be used to set the response type. To send character numbers, you can use Getwriter () to return an image. The following table is a common method for interface HttpServletResponse.

Common methods of Interface HttpServletResponse

Method	Explain
Addcookie (Cookie cookie)	Add the specified cookie to the pre-application
AddHeader (String name,string value)	Adds the specified name and value to the response's head message
Containsheader (String name)	Returns the value of an announcement, whether the affected head is set
Encodeurl (String URL)	The URL specified by the encoding
Senderror (int SC)	Sends a bug to the client using the specified state code
Sendredirect (String location)	Send a temporary response to the client
Setdateheader (String name,long date)	Set the name and date of the response to the head
SetHeader (String name,string value)	Set the name and value of the given head
SetStatus (int SC)	To the pre-settings
setContentType (String ContentType)	The MIME type of the settings

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Java HttpServletRequest and HttpServletResponse