Servlet API Methods

 

Servlet API Methods 

         ServletConfig      

get ServletConfig()

                                        Returns a Servlet Config object, which contains initializatin and startup parameteres for this servlet.

 

         .Java.lang.String         

 getServletInfo()

                                             Returns information about the servlet, such as author,version, and copyright.

              Void   init(ServletCofig  config)

                          Called by the servlet container to indicate to a servlet that the servlet  that the servlet is being placed into service.

             Void      Service (ServletRequst req, Se4rvletResponse res)

                           Called by the servlet container to allow the servlet to respond to a 

                                request.

              Void      destory()

                            Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.

 

Interface: Servlet Config 

Package :javax.servlet

           This Interface A servlet configuration object used by a servlet container used to pass information to a servlet during initialization.

Methods:  

     java.lang.String  getInitParameter(java.lang.String name)

                                  Retuns a String containing the value of the named initalization lparameter, or nul if the parameter does not exist.

     java. util.Enumeration     getInitparameterNames()

                                 Returns the names of the servlet,s initialization parameters as an Enumeration of String objects , or an empty Enumeraion  if the servlet has no initialization parametrs.

      

Servlet Context 

 

 getServletContext()

                                     Returns a reference to theServletContext in which the caller                                                          is executing.

java.lang.String        getServletName()

                                  Returns a reference to the Servlet Context in which the caller                                          is executing.

java.lang.String           getServletName()

                                      Returns the name of this servlet instance.

Interface : ServletRequest

package : javax.servlet 

 

This interface defines an object to provide client request information to a servlet. The servlet container creates a Servlet Request object and passes it as an argument to the servlet's service method.

    

A Servlet Request object provides data including parameter name and values, attributes, and an input stream

 

Methods:

         java.lang.Object   get Attribute (java. lang.String name)

                                          Returns the value of the named atributes as an Object, or null if no attribute of the given name exists.

       java.util.Enumeration     getAttributeNames()

                     Returns an Enumeration containing the names of the                                                                                  attributes  available to this request.                              

        java.lang .String       getCharacterEncoding()                                                                                         Returns the name of the character encoding                           used inthe body of this request.

                 int   getContentLength()                                                                                               Returns the length,in bytes, of the request                                                      body and made available by the input                                                             sream,or-1 if the length is not known.

       java.lang.String    getContent Type()

                      Returns the MIME type of the body of the                                                   request, or null if the type is not known. 

      ServletInput Stream    getInputStream()

                         Retrives the body of the request as binary

                          data using a ServletInputStream

           java.util.Locale     getLocale() 

                          Returns the preferred Locale that the                                                                 client will accept content in, based on                                                             the Accept -Language header.

            java.util.Enumeration   getLocales()

                         Returns anEnumeration of Locale                                                                        object indicating, in decreasing order                                                              starting with the preferred locale, the                                                              locales that are acceptable to the client                                                                    based on the Accept-Language header.           java.long.String 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.

java.util.Enumeration     getParmeterNames()

                  Returns an Enumeration of String objects containing the names of the parameters contained in this request.

java.lang.String[]       getParameterValue(java.lang.String name)

                 Return an array of String objects containing all of the values the given request parameter has, or null if the parameter as a String, or null if the plarameter does not exist.

java.util.Enumeration   getparameterNames()

                 Returns an Enumeration of String object containing the names of the parameters contained in this request.

java.lang.String[]   get parameter Values (java.lang.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.

java.lang.String  getprotocol()   

               Returns the name and version of the protocol the request uses in the form protocol/majorVersion.minorVersion, for example,HTTP/1.1.

java.io.BufferedReader      getReader() 

                Retrieves the body of the request as character data using a BufferedReader.

java.lang.String     getRemoteAddr()

                Returns the Internet protocol(IP) address of the client that sent the request. 

java.lang.string      getScheme() 

                 Returns the name of the scheme used to make this request, for example, http, https, or ftp.

java.lang.String     getServerName()

               Returns the host name of the server that received the                                               request.

       int       getServerport()  

                 Returns the port number on which this request was received.

      boolean     isSecure()

                   Returns a Boolean indicating whether this request was                                                    made using  a secure channel,such as HTTPS.

 

       void     remove Attribute(java. lang.String name)

               Removes an attribute from this request.

      void setAttribute(java.lang.String name,java.lang.Object o)

          Stores an attribute in this request.

     void setCharacterEncoding(java.lang.Sting env)

         Overrides the name of the character encoding used in the body of this request.