javax.servlet.http.HttpServletRequest Maven / Gradle / Ivy
/*
* Copyright (c) 1997-2018 Oracle and/or its affiliates and others.
* All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.*;
import javax.servlet.RequestDispatcher;
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).
*
*
* @author Various
*/
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);
/**
*
* Return the {@link HttpServletMapping} by which the {@link HttpServlet} for this {@code HttpServletRequest} was
* invoked. The mappings for any applicable {@link javax.servlet.Filter}s are not indicated in the result. If the
* currently active {@link javax.servlet.Servlet} invocation was obtained by a call to
* {@link ServletRequest#getRequestDispatcher} followed by a call to {@link RequestDispatcher#forward}, the returned
* {@code
* HttpServletMapping} is the one corresponding to the path used to obtain the {@link RequestDispatcher}. If the
* currently active {@code Servlet} invocation was obtained by a call to {@link ServletRequest#getRequestDispatcher}
* followed by a call to {@link RequestDispatcher#include}, the returned {@code
* HttpServletMapping} is the one corresponding to the path that caused the first {@code Servlet} in the invocation
* sequence to be invoked. If the currently active {@code Servlet} invocation was obtained by a call to
* {@link javax.servlet.AsyncContext#dispatch}, the returned {@code
* HttpServletMapping} is the one corresponding to the path that caused the first {@code Servlet} in the invocation
* sequence to be invoked. See {@link javax.servlet.RequestDispatcher#FORWARD_MAPPING},
* {@link javax.servlet.RequestDispatcher#INCLUDE_MAPPING} and {@link javax.servlet.AsyncContext#ASYNC_MAPPING} for
* additional request attributes related to {@code HttpServletMapping}. If the currently active {@code Servlet}
* invocation was obtained by a call to {@link javax.servlet.ServletContext#getNamedDispatcher}, the returned
* {@code HttpServletMapping} is the one corresponding to the path for the mapping last applied to this request.
*
*
*
* The returned object is immutable. Servlet 4.0 compliant implementations must override this method.
*
*
* @implSpec The default implementation returns a {@code
* HttpServletMapping} that returns the empty string for the match value, pattern and servlet name and {@code null}
* for the match type.
*
* @return An instance of {@code HttpServletMapping} describing the manner in which the current request was invoked.
*
* @since 4.0
*/
default public HttpServletMapping getHttpServletMapping() {
return new HttpServletMapping() {
@Override
public String getMatchValue() {
return "";
}
@Override
public String getPattern() {
return "";
}
@Override
public String getServletName() {
return "";
}
@Override
public MappingMatch getMappingMatch() {
return null;
}
@Override
public String toString() {
return "MappingImpl{" + "matchValue=" + getMatchValue() + ", pattern=" + getPattern() + ", servletName="
+ getServletName() + ", mappingMatch=" + getMappingMatch() + "} HttpServletRequest {"
+ HttpServletRequest.this.toString() + '}';
}
};
}
/**
* 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();
/**
* Instantiates a new instance of {@link PushBuilder} for issuing server push responses from the current request.
* This method returns null if the current connection does not support server push, or server push has been disabled
* by the client via a {@code SETTINGS_ENABLE_PUSH} settings frame value of {@code 0} (zero).
*
* @implSpec The default implementation returns null.
*
* @return a {@link PushBuilder} for issuing server push responses from the current request, or null if push is not
* supported
*
* @since Servlet 4.0
*/
default public PushBuilder newPushBuilder() {
return null;
}
/**
* 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.
*
*
* It is possible that a servlet container may match a context by more than one context path. In such cases this
* method will return the actual context path used by the request and it may differ from the path returned by the
* {@link javax.servlet.ServletContext#getContextPath()} method. The context path returned by
* {@link javax.servlet.ServletContext#getContextPath()} should be considered as the prime or preferred context path
* of the application.
*
* @return a String specifying the portion of the request URI that indicates the context of the request
*
* @see javax.servlet.ServletContext#getContextPath()
*/
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.
*
*
* The role name "*" should never be used as an argument in calling isUserInRole. Any call to
* isUserInRole with "*" must return false. If the role-name of the security-role to be tested is "**",
* and the application has NOT declared an application security-role with role-name "**", isUserInRole
* must only return true if the user has been authenticated; that is, only when {@link #getRemoteUser} and
* {@link #getUserPrincipal} would both return a non-null value. Otherwise, the container must check the user for
* membership in the application role.
*
* @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:
*
*
*
* 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 an URL with a scheme and host, use {@link HttpUtils#getRequestURL}.
*
* @return a String containing the part of the URL from the protocol name up to the query string
*
* @see HttpUtils#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.
*
*
* If this request has been forwarded using {@link javax.servlet.RequestDispatcher#forward}, the server path in the
* reconstructed URL must reflect the path used to obtain the RequestDispatcher, and not the server path specified
* by the client.
*
*
* 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();
/**
* Change the session id of the current session associated with this request and return the new session id.
*
* @return the new session id
*
* @throws IllegalStateException if there is no session associated with the request
*
* @since Servlet 3.1
*/
public String changeSessionId();
/**
* Checks whether the requested session ID is still valid.
*
*
* If the client did not specify any session ID, this method returns false.
*
* @return true if this request has an id for a valid session in the current session context;
* false otherwise
*
* @see #getRequestedSessionId
* @see #getSession
* @see HttpSessionContext
*/
public boolean isRequestedSessionIdValid();
/**
*
* Checks whether the requested session ID was conveyed to the server as an HTTP cookie.
*
*
* @return true if the session ID was conveyed to the server an an HTTP cookie; otherwise,
* false
*
* @see #getSession
*/
public boolean isRequestedSessionIdFromCookie();
/**
*
* Checks whether the requested session ID was conveyed to the server as part of the request URL.
*
*
* @return true if the session ID was conveyed to the server as part of a URL; otherwise,
* false
*
* @see #getSession
*/
public boolean isRequestedSessionIdFromURL();
/**
* @deprecated As of Version 2.1 of the Java Servlet API, use {@link #isRequestedSessionIdFromURL} instead.
*
* @return true if the session ID was conveyed to the server as part of a URL; otherwise,
* false
*/
@Deprecated
public boolean isRequestedSessionIdFromUrl();
/**
* Use the container login mechanism configured for the ServletContext to authenticate the user making
* this request.
*
*
* This method may modify and commit the argument HttpServletResponse.
*
* @param response The HttpServletResponse associated with this HttpServletRequest
*
* @return true when non-null values were or have been established as the values returned by
* getUserPrincipal, getRemoteUser, and getAuthType. Return
* false if authentication is incomplete and the underlying login mechanism has committed, in
* the response, the message (e.g., challenge) and HTTP status code to be returned to the user.
*
* @throws IOException if an input or output error occurred while reading from this request or writing to
* the given response
*
* @throws IllegalStateException if the login mechanism attempted to modify the response and it was already
* committed
*
* @throws ServletException if the authentication failed and the caller is responsible for handling the error
* (i.e., the underlying login mechanism did NOT establish the message and HTTP status
* code to be returned to the user)
*
* @since Servlet 3.0
*/
public boolean authenticate(HttpServletResponse response) throws IOException, ServletException;
/**
* Validate the provided username and password in the password validation realm used by the web container login
* mechanism configured for the ServletContext.
*
*
* This method returns without throwing a ServletException when the login mechanism configured for the
* ServletContext supports username password validation, and when, at the time of the call to login,
* the identity of the caller of the request had not been established (i.e, all of getUserPrincipal,
* getRemoteUser, and getAuthType return null), and when validation of the provided
* credentials is successful. Otherwise, this method throws a ServletException as described below.
*
*
* When this method returns without throwing an exception, it must have established non-null values as the values
* returned by getUserPrincipal, getRemoteUser, and getAuthType.
*
* @param username The String value corresponding to the login identifier of the user.
*
* @param password The password String corresponding to the identified user.
*
* @exception ServletException if the configured login mechanism does not support username password authentication,
* or if a non-null caller identity had already been established (prior to the call to
* login), or if validation of the provided username and password fails.
*
* @since Servlet 3.0
*/
public void login(String username, String password) throws ServletException;
/**
* Establish null as the value returned when getUserPrincipal, getRemoteUser,
* and getAuthType is called on the request.
*
* @exception ServletException if logout fails
*
* @since Servlet 3.0
*/
public void logout() throws ServletException;
/**
* Gets all the {@link Part} components of this request, provided that it is of type
* multipart/form-data.
*
*
* If this request is of type multipart/form-data, but does not contain any Part
* components, the returned Collection will be empty.
*
*
* Any changes to the returned Collection must not affect this HttpServletRequest.
*
* @return a (possibly empty) Collection of the Part components of this request
*
* @throws IOException if an I/O error occurred during the retrieval of the {@link Part} components of
* this request
*
* @throws ServletException if this request is not of type multipart/form-data
*
* @throws IllegalStateException if the request body is larger than maxRequestSize, or any
* Part in the request is larger than maxFileSize, or there
* is no @MultipartConfig or multipart-config in deployment
* descriptors
*
* @see javax.servlet.annotation.MultipartConfig#maxFileSize
* @see javax.servlet.annotation.MultipartConfig#maxRequestSize
*
* @since Servlet 3.0
*/
public Collection getParts() throws IOException, ServletException;
/**
* Gets the {@link Part} with the given name.
*
* @param name the name of the requested Part
*
* @return The Part with the given name, or null if this request is of type
* multipart/form-data, but does not contain the requested Part
*
* @throws IOException if an I/O error occurred during the retrieval of the requested Part
* @throws ServletException if this request is not of type multipart/form-data
* @throws IllegalStateException if the request body is larger than maxRequestSize, or any
* Part in the request is larger than maxFileSize, or there
* is no @MultipartConfig or multipart-config in deployment
* descriptors
*
* @see javax.servlet.annotation.MultipartConfig#maxFileSize
* @see javax.servlet.annotation.MultipartConfig#maxRequestSize
*
* @since Servlet 3.0
*/
public Part getPart(String name) throws IOException, ServletException;
/**
* Creates an instance of HttpUpgradeHandler for a given class and uses it for the http protocol
* upgrade processing.
*
* @param The {@code Class}, which extends {@link HttpUpgradeHandler}, of the {@code handlerClass}.
*
* @param handlerClass The HttpUpgradeHandler class used for the upgrade.
*
* @return an instance of the HttpUpgradeHandler
*
* @exception IOException if an I/O error occurred during the upgrade
* @exception ServletException if the given handlerClass fails to be instantiated
*
* @see javax.servlet.http.HttpUpgradeHandler
* @see javax.servlet.http.WebConnection
*
* @since Servlet 3.1
*/
public T upgrade(Class handlerClass) throws IOException, ServletException;
/**
* Get the request trailer fields.
*
*
* The returned map is not backed by the {@code HttpServletRequest} object, so changes in the returned map are not
* reflected in the {@code HttpServletRequest} object, and vice-versa.
*
*
*
* {@link #isTrailerFieldsReady()} should be called first to determine if it is safe to call this method without
* causing an exception.
*
*
* @implSpec The default implementation returns an empty map.
*
* @return A map of trailer fields in which all the keys are in lowercase, regardless of the case they had at the
* protocol level. If there are no trailer fields, yet {@link #isTrailerFieldsReady} is returning true, the
* empty map is returned.
*
* @throws IllegalStateException if {@link #isTrailerFieldsReady()} is false
*
* @since Servlet 4.0
*/
default public Map getTrailerFields() {
return Collections.emptyMap();
}
/**
* Return a boolean indicating whether trailer fields are ready to read using {@link #getTrailerFields}.
*
* This methods returns true immediately if it is known that there is no trailer in the request, for instance, the
* underlying protocol (such as HTTP 1.0) does not supports the trailer fields, or the request is not in chunked
* encoding in HTTP 1.1. And the method also returns true if both of the following conditions are satisfied:
*
* - the application has read all the request data and an EOF indication has been returned from the
* {@link #getReader} or {@link #getInputStream}.
*
- all the trailer fields sent by the client have been received. Note that it is possible that the client has
* sent no trailer fields.
*
*
* @implSpec The default implementation returns false.
*
* @return a boolean whether trailer fields are ready to read
*
* @since Servlet 4.0
*/
default public boolean isTrailerFieldsReady() {
return true;
}
}