javax.servlet.http.HttpServletRequest Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.servlet.http;
import java.io.IOException;
import java.util.Collection;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
/**
* Extends the {@link javax.servlet.ServletRequest} interface to provide request
* information for HTTP servlets.
*
* The servlet container creates an HttpServletRequest object and
* passes it as an argument to the servlet's service methods
* (doGet, doPost, etc).
*/
public interface HttpServletRequest extends ServletRequest {
/**
* String identifier for Basic authentication. Value "BASIC"
*/
public static final String BASIC_AUTH = "BASIC";
/**
* String identifier for Form authentication. Value "FORM"
*/
public static final String FORM_AUTH = "FORM";
/**
* String identifier for Client Certificate authentication. Value
* "CLIENT_CERT"
*/
public static final String CLIENT_CERT_AUTH = "CLIENT_CERT";
/**
* String identifier for Digest authentication. Value "DIGEST"
*/
public static final String DIGEST_AUTH = "DIGEST";
/**
* Returns the name of the authentication scheme used to protect the
* servlet. All servlet containers support basic, form and client
* certificate authentication, and may additionally support digest
* authentication. If the servlet is not authenticated null is
* returned.
*
* Same as the value of the CGI variable AUTH_TYPE.
*
* @return one of the static members BASIC_AUTH, FORM_AUTH, CLIENT_CERT_AUTH,
* DIGEST_AUTH (suitable for == comparison) or the
* container-specific string indicating the authentication scheme,
* or null if the request was not authenticated.
*/
public String getAuthType();
/**
* Returns an array containing all of the Cookie objects the
* client sent with this request. This method returns null if
* no cookies were sent.
*
* @return an array of all the Cookies included with this
* request, or null if the request has no cookies
*/
public Cookie[] getCookies();
/**
* Returns the value of the specified request header as a long
* value that represents a Date object. Use this method with
* headers that contain dates, such as If-Modified-Since.
*
* The date is returned as the number of milliseconds since January 1, 1970
* GMT. The header name is case insensitive.
*
* If the request did not have a header of the specified name, this method
* returns -1. If the header can't be converted to a date, the method throws
* an IllegalArgumentException.
*
* @param name
* a String specifying the name of the header
* @return a long value representing the date specified in the
* header expressed as the number of milliseconds since January 1,
* 1970 GMT, or -1 if the named header was not included with the
* request
* @exception IllegalArgumentException
* If the header value can't be converted to a date
*/
public long getDateHeader(String name);
/**
* Returns the value of the specified request header as a
* String. If the request did not include a header of the
* specified name, this method returns null. If there are
* multiple headers with the same name, this method returns the first head
* in the request. The header name is case insensitive. You can use this
* method with any request header.
*
* @param name
* a String specifying the header name
* @return a String containing the value of the requested
* header, or null if the request does not have a
* header of that name
*/
public String getHeader(String name);
/**
* Returns all the values of the specified request header as an
* Enumeration of String objects.
*
* Some headers, such as Accept-Language can be sent by clients
* as several headers each with a different value rather than sending the
* header as a comma separated list.
*
* If the request did not include any headers of the specified name, this
* method returns an empty Enumeration. The header name is case
* insensitive. You can use this method with any request header.
*
* @param name
* a String specifying the header name
* @return an Enumeration containing the values of the requested
* header. If the request does not have any headers of that name
* return an empty enumeration. If the container does not allow
* access to header information, return null
*/
public Enumeration getHeaders(String name);
/**
* Returns an enumeration of all the header names this request contains. If
* the request has no headers, this method returns an empty enumeration.
*
* Some servlet containers do not allow servlets to access headers using
* this method, in which case this method returns null
*
* @return an enumeration of all the header names sent with this request; if
* the request has no headers, an empty enumeration; if the servlet
* container does not allow servlets to use this method,
* null
*/
public Enumeration getHeaderNames();
/**
* Returns the value of the specified request header as an int.
* If the request does not have a header of the specified name, this method
* returns -1. If the header cannot be converted to an integer, this method
* throws a NumberFormatException.
*
* The header name is case insensitive.
*
* @param name
* a String specifying the name of a request header
* @return an integer expressing the value of the request header or -1 if the
* request doesn't have a header of this name
* @exception NumberFormatException
* If the header value can't be converted to an
* int
*/
public int getIntHeader(String name);
/**
* Returns the name of the HTTP method with which this request was made, for
* example, GET, POST, or PUT. Same as the value of the CGI variable
* REQUEST_METHOD.
*
* @return a String specifying the name of the method with
* which this request was made
*/
public String getMethod();
/**
* Returns any extra path information associated with the URL the client
* sent when it made this request. The extra path information follows the
* servlet path but precedes the query string and will start with a "/"
* character.
*
* This method returns null if there was no extra path
* information.
*
* Same as the value of the CGI variable PATH_INFO.
*
* @return a String, decoded by the web container, specifying
* extra path information that comes after the servlet path but
* before the query string in the request URL; or null
* if the URL does not have any extra path information
*/
public String getPathInfo();
/**
* Returns any extra path information after the servlet name but before the
* query string, and translates it to a real path. Same as the value of the
* CGI variable PATH_TRANSLATED.
*
* If the URL does not have any extra path information, this method returns
* null or the servlet container cannot translate the virtual
* path to a real path for any reason (such as when the web application is
* executed from an archive). The web container does not decode this string.
*
* @return a String specifying the real path, or
* null if the URL does not have any extra path
* information
*/
public String getPathTranslated();
/**
* Returns the portion of the request URI that indicates the context of the
* request. The context path always comes first in a request URI. The path
* starts with a "/" character but does not end with a "/" character. For
* servlets in the default (root) context, this method returns "". The
* container does not decode this string.
*
* @return a String specifying the portion of the request URI
* that indicates the context of the request
*/
public String getContextPath();
/**
* Returns the query string that is contained in the request URL after the
* path. This method returns null if the URL does not have a
* query string. Same as the value of the CGI variable QUERY_STRING.
*
* @return a String containing the query string or
* null if the URL contains no query string. The value
* is not decoded by the container.
*/
public String getQueryString();
/**
* Returns the login of the user making this request, if the user has been
* authenticated, or null if the user has not been
* authenticated. Whether the user name is sent with each subsequent request
* depends on the browser and type of authentication. Same as the value of
* the CGI variable REMOTE_USER.
*
* @return a String specifying the login of the user making
* this request, or null if the user login is not known
*/
public String getRemoteUser();
/**
* Returns a boolean indicating whether the authenticated user is included
* in the specified logical "role". Roles and role membership can be defined
* using deployment descriptors. If the user has not been authenticated, the
* method returns false.
*
* @param role
* a String specifying the name of the role
* @return a boolean indicating whether the user making this
* request belongs to a given role; false if the user
* has not been authenticated
*/
public boolean isUserInRole(String role);
/**
* Returns a java.security.Principal object containing the name
* of the current authenticated user. If the user has not been
* authenticated, the method returns null.
*
* @return a java.security.Principal containing the name of the
* user making this request; null if the user has not
* been authenticated
*/
public java.security.Principal getUserPrincipal();
/**
* Returns the session ID specified by the client. This may not be the same
* as the ID of the current valid session for this request. If the client
* did not specify a session ID, this method returns null.
*
* @return a String specifying the session ID, or
* null if the request did not specify a session ID
* @see #isRequestedSessionIdValid
*/
public String getRequestedSessionId();
/**
* Returns the part of this request's URL from the protocol name up to the
* query string in the first line of the HTTP request. The web container
* does not decode this String. For example:
*
* Examples of Returned Values
*
* First line of HTTP request
* Returned Value
*
* POST /some/path.html HTTP/1.1
*
* /some/path.html
*
* GET http://foo.bar/a.html HTTP/1.0
*
* /a.html
*
* HEAD /xyz?a=b HTTP/1.1
*
* /xyz
*
*
* To reconstruct a URL with a scheme and host, use
* {@link #getRequestURL}.
*
* @return a String containing the part of the URL from the
* protocol name up to the query string
* @see #getRequestURL
*/
public String getRequestURI();
/**
* Reconstructs the URL the client used to make the request. The returned
* URL contains a protocol, server name, port number, and server path, but
* it does not include query string parameters.
*
* Because this method returns a StringBuffer, not a string,
* you can modify the URL easily, for example, to append query parameters.
*
* This method is useful for creating redirect messages and for reporting
* errors.
*
* @return a StringBuffer object containing the reconstructed
* URL
*/
public StringBuffer getRequestURL();
/**
* Returns the part of this request's URL that calls the servlet. This path
* starts with a "/" character and includes either the servlet name or a
* path to the servlet, but does not include any extra path information or a
* query string. Same as the value of the CGI variable SCRIPT_NAME.
*
* This method will return an empty string ("") if the servlet used to
* process this request was matched using the "/*" pattern.
*
* @return a String containing the name or path of the servlet
* being called, as specified in the request URL, decoded, or an
* empty string if the servlet used to process the request is
* matched using the "/*" pattern.
*/
public String getServletPath();
/**
* Returns the current HttpSession associated with this request
* or, if there is no current session and create is true,
* returns a new session.
*
* If create is false and the request has no valid
* HttpSession, this method returns null.
*
* To make sure the session is properly maintained, you must call this
* method before the response is committed. If the container is using
* cookies to maintain session integrity and is asked to create a new
* session when the response is committed, an IllegalStateException is
* thrown.
*
* @param create
* true to create a new session for this request if
* necessary; false to return null if
* there's no current session
* @return the HttpSession associated with this request or
* null if create is false
* and the request has no valid session
* @see #getSession()
*/
public HttpSession getSession(boolean create);
/**
* Returns the current session associated with this request, or if the
* request does not have a session, creates one.
*
* @return the HttpSession associated with this request
* @see #getSession(boolean)
*/
public HttpSession getSession();
/**
* Changes the session ID of the session associated with this request. This
* method does not create a new session object it only changes the ID of the
* current session.
*
* @return the new session ID allocated to the session
* @see HttpSessionIdListener
* @since Servlet 3.1
*/
public String changeSessionId();
/**
* Checks whether the requested session ID is still valid.
*
* @return true if this request has an id for a valid session
* in the current session context; false otherwise
* @see #getRequestedSessionId
* @see #getSession
*/
public boolean isRequestedSessionIdValid();
/**
* Checks whether the requested session ID came in as a cookie.
*
* @return true if the session ID came in as a cookie;
* otherwise, false
* @see #getSession
*/
public boolean isRequestedSessionIdFromCookie();
/**
* Checks whether the requested session ID came in as part of the request
* URL.
*
* @return true if the session ID came in as part of a URL;
* otherwise, false
* @see #getSession
*/
public boolean isRequestedSessionIdFromURL();
/**
* @return {@link #isRequestedSessionIdFromURL()}
* @deprecated As of Version 2.1 of the Java Servlet API, use
* {@link #isRequestedSessionIdFromURL} instead.
*/
@SuppressWarnings("dep-ann")
// Spec API does not use @Deprecated
public boolean isRequestedSessionIdFromUrl();
/**
* Triggers the same authentication process as would be triggered if the
* request is for a resource that is protected by a security constraint.
*
* @param response The response to use to return any authentication
* challenge
* @return true if the user is successfully authenticated and
* false if not
*
* @throws IOException if the authentication process attempted to read from
* the request or write to the response and an I/O error occurred
* @throws IllegalStateException if the authentication process attempted to
* write to the response after it had been committed
* @throws ServletException if the authentication failed and the caller is
* expected to handle the failure
* @since Servlet 3.0
*/
public boolean authenticate(HttpServletResponse response)
throws IOException, ServletException;
/**
* Authenticate the provided user name and password and then associated the
* authenticated user with the request.
*
* @param username The user name to authenticate
* @param password The password to use to authenticate the user
*
* @throws ServletException
* If any of {@link #getRemoteUser()},
* {@link #getUserPrincipal()} or {@link #getAuthType()} are
* non-null, if the configured authenticator does not support
* user name and password authentication or if the
* authentication fails
* @since Servlet 3.0
*/
public void login(String username, String password) throws ServletException;
/**
* Removes any authenticated user from the request.
*
* @throws ServletException
* If the logout fails
* @since Servlet 3.0
*/
public void logout() throws ServletException;
/**
* Return a collection of all uploaded Parts.
*
* @return A collection of all uploaded Parts.
* @throws IOException
* if an I/O error occurs
* @throws IllegalStateException
* if size limits are exceeded or no multipart configuration is
* provided
* @throws ServletException
* if the request is not multipart/form-data
* @since Servlet 3.0
*/
public Collection getParts() throws IOException,
ServletException;
/**
* Gets the named Part or null if the Part does not exist. Triggers upload
* of all Parts.
*
* @param name The name of the Part to obtain
*
* @return The named Part or null if the Part does not exist
* @throws IOException
* if an I/O error occurs
* @throws IllegalStateException
* if size limits are exceeded
* @throws ServletException
* if the request is not multipart/form-data
* @since Servlet 3.0
*/
public Part getPart(String name) throws IOException,
ServletException;
/**
* Start the HTTP upgrade process and create and instance of the provided
* protocol handler class. The connection will be passed this instance once
* the current request/response pair has completed processing. Calling this
* method sets the response status to
* {@link HttpServletResponse#SC_SWITCHING_PROTOCOLS}.
*
* @param The type of the upgrade handler
* @param httpUpgradeHandlerClass The class that implements the upgrade
* handler
*
* @return A newly created instance of the specified upgrade handler type
*
* @throws IOException
* if an I/O error occurred during the upgrade
* @throws ServletException
* if the given httpUpgradeHandlerClass fails to be instantiated
* @since Servlet 3.1
*/
public T upgrade(
Class httpUpgradeHandlerClass) throws java.io.IOException, ServletException;
}