public Object getAttribute(String name)
Returns the value of the named attribute as an Object,
or null if no attribute of the given name exists. 

 Attributes can be set two ways.  The servlet container may set
attributes to make available custom information about a request.
For example, for requests made using HTTPS, the attribute
javax.servlet.request.X509Certificate can be used to
retrieve information on the certificate of the client.  Attributes
can also be set programatically using 
ServletRequest#setAttribute .  This allows information to be
embedded into a request before a RequestDispatcher  call.

Attribute names should follow the same conventions as package
names. This specification reserves names matching java.*,
javax.*, and sun.*.

 public Enumeration getAttributeNames()
Returns an Enumeration containing the
names of the attributes available to this request. 
This method returns an empty Enumeration
if the request has no attributes available to it.

 public String getCharacterEncoding()
Returns the name of the character encoding used in the body of this
request. This method returns null if the request
does not specify a character encoding

 public int getContentLength()
Returns the length, in bytes, of the request body 
and made available by the input stream, or -1 if the
length is not known. For HTTP servlets, same as the value
of the CGI variable CONTENT_LENGTH.

 public String getContentType()
Returns the MIME type of the body of the request, or 
null if the type is not known. For HTTP servlets, 
same as the value of the CGI variable CONTENT_TYPE.

 public ServletInputStream getInputStream() throws IOException
Retrieves the body of the request as binary data using
a ServletInputStream .  Either this method or 
#getReader  may be called to read the body, not both.

 public String getLocalAddr()
Returns the Internet Protocol (IP) address of the interface on
which the request  was received.

 public String getLocalName()
Returns the host name of the Internet Protocol (IP) interface on
which the request was received.

 public int getLocalPort()
Returns the Internet Protocol (IP) port number of the interface
on which the request was received.

 public Locale getLocale()
Returns the preferred Locale that the client will 
accept content in, based on the Accept-Language header.
If the client request doesn't provide an Accept-Language header,
this method returns the default locale for the server.

 public Enumeration getLocales()
Returns an Enumeration of Locale objects
indicating, in decreasing order starting with the preferred locale, the
locales that are acceptable to the client based on the Accept-Language
header.
If the client request doesn't provide an Accept-Language header,
this method returns an Enumeration containing one 
Locale, the default locale for the server.

 public String getParameter(String name)
Returns the value of a request parameter as a String,
or null if the parameter does not exist. Request parameters
are extra information sent with the request.  For HTTP servlets,
parameters are contained in the query string or posted form data.

You should only use this method when you are sure the
parameter has only one value. If the parameter might have
more than one value, use #getParameterValues .

If you use this method with a multivalued
parameter, the value returned is equal to the first value
in the array returned by getParameterValues.

If the parameter data was sent in the request body, such as occurs
with an HTTP POST request, then reading the body directly via #getInputStream  or #getReader  can interfere
with the execution of this method.

 public Map getParameterMap()
Returns a java.util.Map of the parameters of this request.
Request parameters
are extra information sent with the request.  For HTTP servlets,
parameters are contained in the query string or posted form data.

 public Enumeration getParameterNames()
Returns an Enumeration of String
objects containing the names of the parameters contained
in this request. If the request has 
no parameters, the method returns an 
empty Enumeration.

 public String[] getParameterValues(String name)
Returns an array of String objects containing 
all of the values the given request parameter has, or 
null if the parameter does not exist.

If the parameter has a single value, the array has a length
of 1.

 public String getProtocol()
Returns the name and version of the protocol the request uses
in the form protocol/majorVersion.minorVersion, for 
example, HTTP/1.1. For HTTP servlets, the value
returned is the same as the value of the CGI variable 
SERVER_PROTOCOL.

 public BufferedReader getReader() throws IOException
Retrieves the body of the request as character data using
a BufferedReader.  The reader translates the character
data according to the character encoding used on the body.
Either this method or #getInputStream  may be called to read the
body, not both.

 public String getRealPath(String path)Deprecated! As -  of Version 2.1 of the Java Servlet API,
			use ServletContext#getRealPath  instead.

 public String getRemoteAddr()
Returns the Internet Protocol (IP) address of the client 
or last proxy that sent the request.
For HTTP servlets, same as the value of the 
CGI variable REMOTE_ADDR.

 public String getRemoteHost()
Returns the fully qualified name of the client
or the last proxy that sent the request.
If the engine cannot or chooses not to resolve the hostname 
(to improve performance), this method returns the dotted-string form of 
the IP address. For HTTP servlets, same as the value of the CGI variable 
REMOTE_HOST.

 public int getRemotePort()
Returns the Internet Protocol (IP) source port of the client
or last proxy that sent the request.

 public RequestDispatcher getRequestDispatcher(String path)
Returns a RequestDispatcher  object that acts as a wrapper for
the resource located at the given path.  
A RequestDispatcher object can be used to forward
a request to the resource or to include the resource in a response.
The resource can be dynamic or static.

The pathname specified may be relative, although it cannot extend
outside the current servlet context.  If the path begins with 
a "/" it is interpreted as relative to the current context root.  
This method returns null if the servlet container
cannot return a RequestDispatcher.

The difference between this method and ServletContext#getRequestDispatcher  is that this method can take a
relative path.

 public String getScheme()
Returns the name of the scheme used to make this request, 
for example,
http, https, or ftp.
Different schemes have different rules for constructing URLs,
as noted in RFC 1738.

 public String getServerName()
Returns the host name of the server to which the request was sent.
It is the value of the part before ":" in the Host
header value, if any, or the resolved server name, or the server IP address.

 public int getServerPort()
Returns the port number to which the request was sent.
It is the value of the part after ":" in the Host
header value, if any, or the server port where the client connection
was accepted on.

 public boolean isSecure()
Returns a boolean indicating whether this request was made using a
secure channel, such as HTTPS.

 public  void removeAttribute(String name)
Removes an attribute from this request.  This method is not
generally needed as attributes only persist as long as the request
is being handled.

Attribute names should follow the same conventions as
package names. Names beginning with java.*,
javax.*, and com.sun.*, are
reserved for use by Sun Microsystems.

 public  void setAttribute(String name,
    Object o)
Stores an attribute in this request.
Attributes are reset between requests.  This method is most
often used in conjunction with RequestDispatcher .

Attribute names should follow the same conventions as
package names. Names beginning with java.*,
javax.*, and com.sun.*, are
reserved for use by Sun Microsystems.

 If the object passed in is null, the effect is the same as
calling #removeAttribute .

 It is warned that when the request is dispatched from the
servlet resides in a different web application by
RequestDispatcher, the object set by this method
may not be correctly retrieved in the caller servlet.

 public  void setCharacterEncoding(String env) throws UnsupportedEncodingException
Overrides the name of the character encoding used in the body of this
request. This method must be called prior to reading request parameters
or reading input using getReader().