JavaEE Web API 8.0.1 · javax.servlet.ServletRequest

Method Summary

Modifier and Type	Method and Description
public AsyncContext	Returns: the AsyncContext that was created or reinitialized by the most recent invocation of `startAsync` or `startAsync(ServletRequest, ServletResponse)` on this request getAsyncContext() Gets the AsyncContext that was created or reinitialized by the most recent invocation of `startAsync` or `startAsync(ServletRequest, ServletResponse)` on this request.
public Object	Returns: an `Object` containing the value of the attribute, or `null` if the attribute does not exist getAttribute(String a `String` specifying the name of the attribute name) Returns the value of the named attribute as an `Object`, or `null` if no attribute of the given name exists.
public Enumeration<String>	Returns: an `Enumeration` of strings containing the names of the request's attributes getAttributeNames() Returns an `Enumeration` containing the names of the attributes available to this request.
public String	Returns: a `String` containing the name of the character encoding, or `null` if the request does not specify a character encoding getCharacterEncoding() Returns the name of the character encoding used in the body of this request.
public int	Returns: an integer containing the length of the request body or -1 if the length is not known or is greater than Integer.MAX_VALUE. 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 ir is greater than Integer.MAX_VALUE.
public long	Returns: a long containing the length of the request body or -1L if the length is not known getContentLengthLong() Returns the length, in bytes, of the request body and made available by the input stream, or -1 if the length is not known.
public String	Returns: a `String` containing the name of the MIME type of the request, or null if the type is not known getContentType() Returns the MIME type of the body of the request, or `null` if the type is not known.
public DispatcherType	Returns: the dispatcher type of this request getDispatcherType() Gets the dispatcher type of this request.
public ServletInputStream	Returns: a `ServletInputStream` object containing the body of the request getInputStream() Retrieves the body of the request as binary data using a `ServletInputStream`.
public String	Returns: a `String` containing the IP address on which the request was received. getLocalAddr() Returns the Internet Protocol (IP) address of the interface on which the request was received.
public Locale	Returns: the preferred `Locale` for the client getLocale() Returns the preferred `Locale` that the client will accept content in, based on the Accept-Language header.
public Enumeration<Locale>	Returns: an `Enumeration` of preferred `Locale` objects for the client 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.
public String	Returns: a `String` containing the host name of the IP on which the request was received. getLocalName() Returns the host name of the Internet Protocol (IP) interface on which the request was received.
public int	Returns: an integer specifying the port number getLocalPort() Returns the Internet Protocol (IP) port number of the interface on which the request was received.
public String	Returns: a `String` representing the single value of the parameter getParameter(String a `String` specifying the name of the parameter name) Returns the value of a request parameter as a `String`, or `null` if the parameter does not exist.
public Map<String, String[]>	Returns: an immutable java.util.Map containing parameter names as keys and parameter values as map values. The keys in the parameter map are of type String. The values in the parameter map are of type String array. getParameterMap() Returns a java.util.Map of the parameters of this request.
public Enumeration<String>	Returns: an `Enumeration` of `String` objects, each `String` containing the name of a request parameter; or an empty `Enumeration` if the request has no parameters getParameterNames() Returns an `Enumeration` of `String` objects containing the names of the parameters contained in this request.
public String[]	Returns: an array of `String` objects containing the parameter's values getParameterValues(String a `String` containing the name of the parameter whose value is requested 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.
public String	Returns: a `String` containing the protocol name and version number getProtocol() Returns the name and version of the protocol the request uses in the form protocol/majorVersion.minorVersion, for example, HTTP/1.1.
public BufferedReader	Returns: a `BufferedReader` containing the body of the request getReader() Retrieves the body of the request as character data using a `BufferedReader`.
public String	Returns: the real path, or `null` if the translation cannot be performed. getRealPath(String the path for which the real path is to be returned. path) Deprecated As of Version 2.1 of the Java Servlet API, use `ServletContext#getRealPath` instead.
public String	Returns: a `String` containing the IP address of the client that sent the request getRemoteAddr() Returns the Internet Protocol (IP) address of the client or last proxy that sent the request.
public String	Returns: a `String` containing the fully qualified name of the client getRemoteHost() Returns the fully qualified name of the client or the last proxy that sent the request.
public int	Returns: an integer specifying the port number getRemotePort() Returns the Internet Protocol (IP) source port of the client or last proxy that sent the request.
public RequestDispatcher	Returns: a `RequestDispatcher` object that acts as a wrapper for the resource at the specified path, or `null` if the servlet container cannot return a `RequestDispatcher` getRequestDispatcher(String a `String` specifying the pathname to the resource. If it is relative, it must be relative against the current servlet. path) Returns a `RequestDispatcher` object that acts as a wrapper for the resource located at the given path.
public String	Returns: a `String` containing the name of the scheme used to make this request getScheme() Returns the name of the scheme used to make this request, for example, `http`, `https`, or `ftp`.
public String	Returns: a `String` containing the name of the server getServerName() Returns the host name of the server to which the request was sent.
public int	Returns: an integer specifying the port number getServerPort() Returns the port number to which the request was sent.
public ServletContext	Returns: the servlet context to which this ServletRequest was last dispatched getServletContext() Gets the servlet context to which this ServletRequest was last dispatched.
public boolean	Returns: true if this request has been put into asynchronous mode, false otherwise isAsyncStarted() Checks if this request has been put into asynchronous mode.
public boolean	Returns: true if this request supports asynchronous operation, false otherwise isAsyncSupported() Checks if this request supports asynchronous operation.
public boolean	Returns: a boolean indicating if the request was made using a secure channel isSecure() Returns a boolean indicating whether this request was made using a secure channel, such as HTTPS.
public void	removeAttribute(String a `String` specifying the name of the attribute to remove name) Removes an attribute from this request.
public void	setAttribute(String a `String` specifying the name of the attribute name, Object the `Object` to be stored o) Stores an attribute in this request.
public void	setCharacterEncoding(String `String` containing the name of the character encoding. env) Overrides the name of the character encoding used in the body of this request.
public AsyncContext	Returns: the (re)initialized AsyncContext startAsync() Puts this request into asynchronous mode, and initializes its `AsyncContext` with the original (unwrapped) ServletRequest and ServletResponse objects.
public AsyncContext	Returns: the (re)initialized AsyncContext startAsync(ServletRequest the ServletRequest used to initialize the AsyncContext servletRequest, ServletResponse the ServletResponse used to initialize the AsyncContext servletResponse) Puts this request into asynchronous mode, and initializes its `AsyncContext` with the given request and response objects.

Method Detail

getAsyncContext back to summary

getAsyncContext	back to summary
public AsyncContext getAsyncContext() Gets the AsyncContext that was created or reinitialized by the most recent invocation of `startAsync` or `startAsync(ServletRequest, ServletResponse)` on this request. Returns:AsyncContext the AsyncContext that was created or reinitialized by the most recent invocation of `startAsync` or `startAsync(ServletRequest, ServletResponse)` on this request Exceptions IllegalStateException: if this request has not been put into asynchronous mode, i.e., if neither `startAsync` nor `startAsync(ServletRequest, ServletResponse)` has been called Since Servlet 3.0

public AsyncContext getAsyncContext()

Gets the AsyncContext that was created or reinitialized by the most recent invocation of startAsync or startAsync(ServletRequest, ServletResponse) on this request.

Returns:AsyncContext

the AsyncContext that was created or reinitialized by the most recent invocation of startAsync or startAsync(ServletRequest, ServletResponse) on this request

Exceptions

IllegalStateException:: if this request has not been put into asynchronous mode, i.e., if neither startAsync nor startAsync(ServletRequest, ServletResponse) has been called

Since

Servlet 3.0

getAttribute back to summary

getAttribute	back to summary
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.*`. Parameters name:String a `String` specifying the name of the attribute Returns:Object an `Object` containing the value of the attribute, or `null` if the attribute does not exist

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.*.

Parameters

name:String: a String specifying the name of the attribute

Returns:Object

an Object containing the value of the attribute, or null if the attribute does not exist

getAttributeNames back to summary

getAttributeNames	back to summary
public Enumeration<String> 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. Returns:Enumeration<String> an `Enumeration` of strings containing the names of the request's attributes

public Enumeration<String> 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.

Returns:Enumeration<String>: an Enumeration of strings containing the names of the request's attributes

getCharacterEncoding back to summary

getCharacterEncoding	back to summary
public String getCharacterEncoding() Returns the name of the character encoding used in the body of this request. This method returns `null` if no request encoding character encoding has been specified. The following methods for specifying the request character encoding are consulted, in decreasing order of priority: per request, per web app (using `ServletContext#setRequestCharacterEncoding`, deployment descriptor), and per container (for all web applications deployed in that container, using vendor specific configuration). Returns:String a `String` containing the name of the character encoding, or `null` if the request does not specify a character encoding

public String getCharacterEncoding()

Returns the name of the character encoding used in the body of this request. This method returns null if no request encoding character encoding has been specified. The following methods for specifying the request character encoding are consulted, in decreasing order of priority: per request, per web app (using ServletContext#setRequestCharacterEncoding, deployment descriptor), and per container (for all web applications deployed in that container, using vendor specific configuration).

Returns:String: a String containing the name of the character encoding, or null if the request does not specify a character encoding

getContentLength	back to summary
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 ir is greater than Integer.MAX_VALUE. For HTTP servlets, same as the value of the CGI variable CONTENT_LENGTH. Returns:int an integer containing the length of the request body or -1 if the length is not known or is greater than Integer.MAX_VALUE.

getContentLength

back to summary

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 ir is greater than Integer.MAX_VALUE. For HTTP servlets, same as the value of the CGI variable CONTENT_LENGTH.

Returns:int: an integer containing the length of the request body or -1 if the length is not known or is greater than Integer.MAX_VALUE.

getContentLengthLong	back to summary
public long getContentLengthLong() 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. Returns:long a long containing the length of the request body or -1L if the length is not known Since Servlet 3.1

getContentLengthLong

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public long getContentLengthLong()

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.

Returns:long: a long containing the length of the request body or -1L if the length is not known
Since: Servlet 3.1

getContentType back to summary

getContentType	back to summary
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. Returns:String a `String` containing the name of the MIME type of the request, or null if the type is not known

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.

Returns:String: a String containing the name of the MIME type of the request, or null if the type is not known

getDispatcherType back to summary

getDispatcherType	back to summary
public DispatcherType getDispatcherType() Gets the dispatcher type of this request. The dispatcher type of a request is used by the container to select the filters that need to be applied to the request: Only filters with matching dispatcher type and url patterns will be applied. Allowing a filter that has been configured for multiple dispatcher types to query a request for its dispatcher type allows the filter to process the request differently depending on its dispatcher type. The initial dispatcher type of a request is defined as `DispatcherType.REQUEST`. The dispatcher type of a request dispatched via `RequestDispatcher#forward(ServletRequest, ServletResponse)` or `RequestDispatcher#include(ServletRequest, ServletResponse)` is given as `DispatcherType.FORWARD` or `DispatcherType.INCLUDE`, respectively, while the dispatcher type of an asynchronous request dispatched via one of the `AsyncContext#dispatch` methods is given as `DispatcherType.ASYNC`. Finally, the dispatcher type of a request dispatched to an error page by the container's error handling mechanism is given as `DispatcherType.ERROR`. Returns:DispatcherType the dispatcher type of this request Since Servlet 3.0 See Also `DispatcherType`

public DispatcherType getDispatcherType()

Gets the dispatcher type of this request.

The dispatcher type of a request is used by the container to select the filters that need to be applied to the request: Only filters with matching dispatcher type and url patterns will be applied.

Allowing a filter that has been configured for multiple dispatcher types to query a request for its dispatcher type allows the filter to process the request differently depending on its dispatcher type.

The initial dispatcher type of a request is defined as DispatcherType.REQUEST. The dispatcher type of a request dispatched via RequestDispatcher#forward(ServletRequest, ServletResponse) or RequestDispatcher#include(ServletRequest, ServletResponse) is given as DispatcherType.FORWARD or DispatcherType.INCLUDE, respectively, while the dispatcher type of an asynchronous request dispatched via one of the AsyncContext#dispatch methods is given as DispatcherType.ASYNC. Finally, the dispatcher type of a request dispatched to an error page by the container's error handling mechanism is given as DispatcherType.ERROR.

Returns:DispatcherType: the dispatcher type of this request
Since: Servlet 3.0
See Also: DispatcherType

getInputStream back to summary

getInputStream	back to summary
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. Returns:ServletInputStream a `ServletInputStream` object containing the body of the request Exceptions IOException: if an input or output exception occurred IllegalStateException: if the `getReader` method has already been called for this request

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.

Returns:ServletInputStream

a ServletInputStream object containing the body of the request

Exceptions

IOException:: if an input or output exception occurred
IllegalStateException:: if the getReader method has already been called for this request

getLocalAddr back to summary

getLocalAddr	back to summary
public String getLocalAddr() Returns the Internet Protocol (IP) address of the interface on which the request was received. Returns:String a `String` containing the IP address on which the request was received. Since Servlet 2.4

public String getLocalAddr()

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

Returns:String: a String containing the IP address on which the request was received.
Since: Servlet 2.4

getLocale back to summary

getLocale	back to summary
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. Returns:Locale the preferred `Locale` for the client

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.

Returns:Locale: the preferred Locale for the client

getLocales back to summary

getLocales	back to summary
public Enumeration<Locale> 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. Returns:Enumeration<Locale> an `Enumeration` of preferred `Locale` objects for the client

public Enumeration<Locale> 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.

Returns:Enumeration<Locale>: an Enumeration of preferred Locale objects for the client

getLocalName back to summary

getLocalName	back to summary
public String getLocalName() Returns the host name of the Internet Protocol (IP) interface on which the request was received. Returns:String a `String` containing the host name of the IP on which the request was received. Since Servlet 2.4

public String getLocalName()

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

Returns:String: a String containing the host name of the IP on which the request was received.
Since: Servlet 2.4

getLocalPort	back to summary
public int getLocalPort() Returns the Internet Protocol (IP) port number of the interface on which the request was received. Returns:int an integer specifying the port number Since Servlet 2.4

getLocalPort

back to summary

public int getLocalPort()

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

Returns:int: an integer specifying the port number
Since: Servlet 2.4

getParameter back to summary

getParameter	back to summary
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. Parameters name:String a `String` specifying the name of the parameter Returns:String a `String` representing the single value of the parameter See Also `getParameterValues`

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.

Parameters

name:String: a String specifying the name of the parameter

Returns:String

a String representing the single value of the parameter

See Also

getParameterValues

getParameterMap	back to summary
public Map<String, String[]> 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. Returns:Map<String, String[]> an immutable java.util.Map containing parameter names as keys and parameter values as map values. The keys in the parameter map are of type String. The values in the parameter map are of type String array.

getParameterMap

back to summary

public Map<String, String[]> 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.

Returns:Map<String, String[]>: an immutable java.util.Map containing parameter names as keys and parameter values as map values. The keys in the parameter map are of type String. The values in the parameter map are of type String array.

getParameterNames back to summary

getParameterNames	back to summary
public Enumeration<String> 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`. Returns:Enumeration<String> an `Enumeration` of `String` objects, each `String` containing the name of a request parameter; or an empty `Enumeration` if the request has no parameters

public Enumeration<String> 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.

Returns:Enumeration<String>: an Enumeration of String objects, each String containing the name of a request parameter; or an empty Enumeration if the request has no parameters

getParameterValues back to summary

getParameterValues	back to summary
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. Parameters name:String a `String` containing the name of the parameter whose value is requested Returns:String[] an array of `String` objects containing the parameter's values See Also `getParameter`

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.

Parameters

name:String: a String containing the name of the parameter whose value is requested

Returns:String[]

an array of String objects containing the parameter's values

See Also

getParameter

getProtocol back to summary

getProtocol	back to summary
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`. Returns:String a `String` containing the protocol name and version number

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.

Returns:String: a String containing the protocol name and version number

getReader back to summary

getReader	back to summary
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. Returns:BufferedReader a `BufferedReader` containing the body of the request Exceptions IOException: if an input or output exception occurred UnsupportedEncodingException: if the character set encoding used is not supported and the text cannot be decoded IllegalStateException: if `getInputStream` method has been called on this request See Also `getInputStream`

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.

Returns:BufferedReader

a BufferedReader containing the body of the request

Exceptions

IOException:: if an input or output exception occurred
UnsupportedEncodingException:: if the character set encoding used is not supported and the text cannot be decoded
IllegalStateException:: if getInputStream method has been called on this request

See Also

getInputStream

getRealPath	back to summary
public String getRealPath(String path) Deprecated As of Version 2.1 of the Java Servlet API, use `ServletContext#getRealPath` instead. Parameters path:String the path for which the real path is to be returned. Returns:String the real path, or `null` if the translation cannot be performed.

getRemoteAddr back to summary

getRemoteAddr	back to summary
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`. Returns:String a `String` containing the IP address of the client that sent the request

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.

Returns:String: a String containing the IP address of the client that sent the request

getRemoteHost back to summary

getRemoteHost	back to summary
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`. Returns:String a `String` containing the fully qualified name of the client

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.

Returns:String: a String containing the fully qualified name of the client

getRemotePort	back to summary
public int getRemotePort() Returns the Internet Protocol (IP) source port of the client or last proxy that sent the request. Returns:int an integer specifying the port number Since Servlet 2.4

getRemotePort

back to summary

public int getRemotePort()

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

Returns:int: an integer specifying the port number
Since: Servlet 2.4

getRequestDispatcher back to summary

getRequestDispatcher	back to summary
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. Parameters path:String a `String` specifying the pathname to the resource. If it is relative, it must be relative against the current servlet. Returns:RequestDispatcher a `RequestDispatcher` object that acts as a wrapper for the resource at the specified path, or `null` if the servlet container cannot return a `RequestDispatcher` See Also `RequestDispatcher`, `ServletContext#getRequestDispatcher`

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.

Parameters

path:String: a String specifying the pathname to the resource. If it is relative, it must be relative against the current servlet.

Returns:RequestDispatcher

a RequestDispatcher object that acts as a wrapper for the resource at the specified path, or null if the servlet container cannot return a RequestDispatcher

getScheme back to summary

getScheme	back to summary
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. Returns:String a `String` containing the name of the scheme used to make this request

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.

Returns:String: a String containing the name of the scheme used to make this request

getServerName back to summary

getServerName	back to summary
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. Returns:String a `String` containing the name of the server

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.

Returns:String: a String containing the name of the server

getServerPort back to summary

getServerPort	back to summary
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. Returns:int an integer specifying the port number

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.

Returns:int: an integer specifying the port number

getServletContext	back to summary
public ServletContext getServletContext() Gets the servlet context to which this ServletRequest was last dispatched. Returns:ServletContext the servlet context to which this ServletRequest was last dispatched Since Servlet 3.0

getServletContext

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public ServletContext getServletContext()

Gets the servlet context to which this ServletRequest was last dispatched.

Returns:ServletContext: the servlet context to which this ServletRequest was last dispatched
Since: Servlet 3.0

isAsyncStarted back to summary

isAsyncStarted	back to summary
public boolean isAsyncStarted() Checks if this request has been put into asynchronous mode. A ServletRequest is put into asynchronous mode by calling `startAsync` or `startAsync(ServletRequest, ServletResponse)` on it. This method returns `false` if this request was put into asynchronous mode, but has since been dispatched using one of the `AsyncContext#dispatch` methods or released from asynchronous mode via a call to `AsyncContext#complete`. Returns:boolean true if this request has been put into asynchronous mode, false otherwise Since Servlet 3.0

public boolean isAsyncStarted()

Checks if this request has been put into asynchronous mode.

A ServletRequest is put into asynchronous mode by calling startAsync or startAsync(ServletRequest, ServletResponse) on it.

This method returns false if this request was put into asynchronous mode, but has since been dispatched using one of the AsyncContext#dispatch methods or released from asynchronous mode via a call to AsyncContext#complete.

Returns:boolean: true if this request has been put into asynchronous mode, false otherwise
Since: Servlet 3.0

isAsyncSupported	back to summary
public boolean isAsyncSupported() Checks if this request supports asynchronous operation. Asynchronous operation is disabled for this request if this request is within the scope of a filter or servlet that has not been annotated or flagged in the deployment descriptor as being able to support asynchronous handling. Returns:boolean true if this request supports asynchronous operation, false otherwise Since Servlet 3.0

isAsyncSupported

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public boolean isAsyncSupported()

Checks if this request supports asynchronous operation.

Asynchronous operation is disabled for this request if this request is within the scope of a filter or servlet that has not been annotated or flagged in the deployment descriptor as being able to support asynchronous handling.

Returns:boolean: true if this request supports asynchronous operation, false otherwise
Since: Servlet 3.0

isSecure	back to summary
public boolean isSecure() Returns a boolean indicating whether this request was made using a secure channel, such as HTTPS. Returns:boolean a boolean indicating if the request was made using a secure channel

isSecure

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public boolean isSecure()

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

Returns:boolean: a boolean indicating if the request was made using a secure channel

removeAttribute back to summary

removeAttribute	back to summary
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. Parameters name:String a `String` specifying the name of the attribute to remove

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.

Parameters

name:String: a String specifying the name of the attribute to remove

setAttribute back to summary

setAttribute	back to summary
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. Parameters name:String a `String` specifying the name of the attribute o:Object the `Object` to be stored

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.

Parameters

name:String: a String specifying the name of the attribute
o:Object: the Object to be stored

setCharacterEncoding back to summary

setCharacterEncoding	back to summary
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(). Otherwise, it has no effect. Parameters env:String `String` containing the name of the character encoding. Exceptions UnsupportedEncodingException: if this ServletRequest is still in a state where a character encoding may be set, but the specified encoding is invalid

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(). Otherwise, it has no effect.

Parameters

env:String: String containing the name of the character encoding.

Exceptions

UnsupportedEncodingException:: if this ServletRequest is still in a state where a character encoding may be set, but the specified encoding is invalid

startAsync back to summary

startAsync	back to summary
public AsyncContext startAsync() throws IllegalStateException Puts this request into asynchronous mode, and initializes its `AsyncContext` with the original (unwrapped) ServletRequest and ServletResponse objects. Calling this method will cause committal of the associated response to be delayed until `AsyncContext#complete` is called on the returned `AsyncContext`, or the asynchronous operation has timed out. Calling `AsyncContext#hasOriginalRequestAndResponse()` on the returned AsyncContext will return `true`. Any filters invoked in the outbound direction after this request was put into asynchronous mode may use this as an indication that any request and/or response wrappers that they added during their inbound invocation need not stay around for the duration of the asynchronous operation, and therefore any of their associated resources may be released. This method clears the list of `AsyncListener` instances (if any) that were registered with the AsyncContext returned by the previous call to one of the startAsync methods, after calling each AsyncListener at its `onStartAsync` method. Subsequent invocations of this method, or its overloaded variant, will return the same AsyncContext instance, reinitialized as appropriate. Returns:AsyncContext the (re)initialized AsyncContext Exceptions IllegalStateException: if this request is within the scope of a filter or servlet that does not support asynchronous operations (that is, `isAsyncSupported` returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the `AsyncContext#dispatch` methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed Since Servlet 3.0 See Also `AsyncContext#dispatch()`

public AsyncContext startAsync() throws IllegalStateException

Puts this request into asynchronous mode, and initializes its AsyncContext with the original (unwrapped) ServletRequest and ServletResponse objects.

Calling this method will cause committal of the associated response to be delayed until AsyncContext#complete is called on the returned AsyncContext, or the asynchronous operation has timed out.

Calling AsyncContext#hasOriginalRequestAndResponse() on the returned AsyncContext will return true. Any filters invoked in the outbound direction after this request was put into asynchronous mode may use this as an indication that any request and/or response wrappers that they added during their inbound invocation need not stay around for the duration of the asynchronous operation, and therefore any of their associated resources may be released.

This method clears the list of AsyncListener instances (if any) that were registered with the AsyncContext returned by the previous call to one of the startAsync methods, after calling each AsyncListener at its onStartAsync method.

Subsequent invocations of this method, or its overloaded variant, will return the same AsyncContext instance, reinitialized as appropriate.

Returns:AsyncContext

the (re)initialized AsyncContext

Exceptions

IllegalStateException:: if this request is within the scope of a filter or servlet that does not support asynchronous operations (that is, isAsyncSupported returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the AsyncContext#dispatch methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed

Since

Servlet 3.0

See Also

AsyncContext#dispatch()

startAsync back to summary

startAsync	back to summary
public AsyncContext startAsync(ServletRequest servletRequest, ServletResponse servletResponse) throws IllegalStateException Puts this request into asynchronous mode, and initializes its `AsyncContext` with the given request and response objects. The ServletRequest and ServletResponse arguments must be the same instances, or instances of `ServletRequestWrapper` and `ServletResponseWrapper` that wrap them, that were passed to the `service` method of the Servlet or the `doFilter` method of the Filter, respectively, in whose scope this method is being called. Calling this method will cause committal of the associated response to be delayed until `AsyncContext#complete` is called on the returned `AsyncContext`, or the asynchronous operation has timed out. Calling `AsyncContext#hasOriginalRequestAndResponse()` on the returned AsyncContext will return `false`, unless the passed in ServletRequest and ServletResponse arguments are the original ones or do not carry any application-provided wrappers. Any filters invoked in the outbound direction after this request was put into asynchronous mode may use this as an indication that some of the request and/or response wrappers that they added during their inbound invocation may need to stay in place for the duration of the asynchronous operation, and their associated resources may not be released. A ServletRequestWrapper applied during the inbound invocation of a filter may be released by the outbound invocation of the filter only if the given `servletRequest`, which is used to initialize the AsyncContext and will be returned by a call to `AsyncContext#getRequest()`, does not contain said ServletRequestWrapper. The same holds true for ServletResponseWrapper instances. This method clears the list of `AsyncListener` instances (if any) that were registered with the AsyncContext returned by the previous call to one of the startAsync methods, after calling each AsyncListener at its `onStartAsync` method. Subsequent invocations of this method, or its zero-argument variant, will return the same AsyncContext instance, reinitialized as appropriate. If a call to this method is followed by a call to its zero-argument variant, the specified (and possibly wrapped) request and response objects will remain locked in on the returned AsyncContext. Parameters servletRequest:ServletRequest the ServletRequest used to initialize the AsyncContext servletResponse:ServletResponse the ServletResponse used to initialize the AsyncContext Returns:AsyncContext the (re)initialized AsyncContext Exceptions IllegalStateException: if this request is within the scope of a filter or servlet that does not support asynchronous operations (that is, `isAsyncSupported` returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the `AsyncContext#dispatch` methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed Since Servlet 3.0

public AsyncContext startAsync(ServletRequest servletRequest, ServletResponse servletResponse) throws IllegalStateException

Puts this request into asynchronous mode, and initializes its AsyncContext with the given request and response objects.

The ServletRequest and ServletResponse arguments must be the same instances, or instances of ServletRequestWrapper and ServletResponseWrapper that wrap them, that were passed to the service method of the Servlet or the doFilter method of the Filter, respectively, in whose scope this method is being called.

Calling this method will cause committal of the associated response to be delayed until AsyncContext#complete is called on the returned AsyncContext, or the asynchronous operation has timed out.

Calling AsyncContext#hasOriginalRequestAndResponse() on the returned AsyncContext will return false, unless the passed in ServletRequest and ServletResponse arguments are the original ones or do not carry any application-provided wrappers. Any filters invoked in the outbound direction after this request was put into asynchronous mode may use this as an indication that some of the request and/or response wrappers that they added during their inbound invocation may need to stay in place for the duration of the asynchronous operation, and their associated resources may not be released. A ServletRequestWrapper applied during the inbound invocation of a filter may be released by the outbound invocation of the filter only if the given servletRequest, which is used to initialize the AsyncContext and will be returned by a call to AsyncContext#getRequest(), does not contain said ServletRequestWrapper. The same holds true for ServletResponseWrapper instances.

Subsequent invocations of this method, or its zero-argument variant, will return the same AsyncContext instance, reinitialized as appropriate. If a call to this method is followed by a call to its zero-argument variant, the specified (and possibly wrapped) request and response objects will remain locked in on the returned AsyncContext.

Parameters

servletRequest:ServletRequest: the ServletRequest used to initialize the AsyncContext
servletResponse:ServletResponse: the ServletResponse used to initialize the AsyncContext

Returns:AsyncContext

the (re)initialized AsyncContext

Exceptions

IllegalStateException:: if this request is within the scope of a filter or servlet that does not support asynchronous operations (that is, isAsyncSupported returns false), or if this method is called again without any asynchronous dispatch (resulting from one of the AsyncContext#dispatch methods), is called outside the scope of any such dispatch, or is called again within the scope of the same dispatch, or if the response has already been closed

Since

Servlet 3.0

public Interface ServletRequest

Method Summary

Method Detail