lindhorst.servlet.http
Class MultipartRequest

java.lang.Object
  |
  +--lindhorst.servlet.http.MultipartRequest

All Implemented Interfaces:

javax.servlet.http.HttpServletRequest, javax.servlet.ServletRequest

public class MultipartRequest

extends java.lang.Object

implements javax.servlet.http.HttpServletRequest

Other than the normal HttpServletRequest class contained in Sun's Servlet Development Kit, this class handles requests with content type "multipart/form-data". However it does only partly implement RFC 1867, since it cannot handle more than one file per parameter (no content type "multipart/mixed" in parameters). Since it implements interface HttpServletRequest it can be used instead of the normal HttpServletRequest that server hands over to the service method of class HttpServlet.
Example:

 public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
 {
   if(req.getContentType().toLowerCase().equals("multipart/form-data"))
     req=new MultipartRequest(req);

   //do something with it
 }
 

With these lines multipart/form-data requests can be handled just like normal ones. The only difference is that parameters have to be tested if they hold content or text and treat them accordingly. See methods isContentParameter() and isNormalParameter().

Field Summary

Fields inherited from interface javax.servlet.http.HttpServletRequest

BASIC_AUTH, CLIENT_CERT_AUTH, DIGEST_AUTH, FORM_AUTH

Constructor Summary

MultipartRequest(javax.servlet.http.HttpServletRequest request)
creates a new MultipartRequest instance from the given HttpServletRequest with the default maximum allowed size.

MultipartRequest(javax.servlet.http.HttpServletRequest request, int maximumSize)
creates a new MultipartRequest instance from the given HttpServletRequest with the given maximum allowed size.

Method Summary

java.lang.Object	getAttribute(java.lang.String name) Returns the value of the named attribute of the request, or null if the attribute does not exist.
java.util.Enumeration	getAttributeNames()
java.lang.String	getAuthType() Gets the authentication scheme of this request.
java.lang.String	getBoundary() the boundary returned by this method is the boundary extracted from the original request plus a leading "--"
java.lang.String	getCharacterEncoding() Returns the character set encoding for the input of this request.
int	getContentLength() Returns the size of the request entity data, or -1 if not known.
java.lang.String	getContentType() Returns the Internet Media Type of the request entity data, or null if not known.
java.lang.String	getContextPath()
javax.servlet.http.Cookie[]	getCookies() Gets the array of cookies found in this request.
long	getDateHeader(java.lang.String name) Gets the value of the requested date header field of this request.
java.lang.String	getHeader(java.lang.String name) Gets the value of the requested header field of this request.
java.util.Enumeration	getHeaderNames() Gets the header names for this request.
java.util.Enumeration	getHeaders(java.lang.String name)
javax.servlet.ServletInputStream	getInputStream() Returns an input stream for reading binary data in the request body.
int	getIntHeader(java.lang.String name) Gets the value of the specified integer header field of this request.
java.util.Locale	getLocale()
java.util.Enumeration	getLocales()
java.lang.String	getMethod() Gets the HTTP method (for example, GET, POST, PUT) with which this request was made.
java.lang.String	getParameter(java.lang.String parameterName) Returns a string containing the lone value of the specified parameter, or null if the parameter does not exist.
byte[]	getParameterContent(java.lang.String parameterName)
java.lang.String	getParameterContentFileName(java.lang.String parameterName)
java.lang.String	getParameterContentType(java.lang.String parameterName)
java.util.Map	getParameterMap()
java.util.Enumeration	getParameterNames() Returns the parameter names for this request as an enumeration of strings, or an empty enumeration if there are no parameters or the input stream is empty.
java.lang.String[]	getParameterValues(java.lang.String parameterName) Returns the values of the specified parameter for the request as an array of strings, or null if the named parameter does not exist.
java.lang.String	getPathInfo() Gets any optional extra path information following the servlet path of this request's URI, but immediately preceding its query string.
java.lang.String	getPathTranslated() Gets any optional extra path information following the servlet path of this request's URI, but immediately preceding its query string, and translates it to a real path.
java.lang.String	getProtocol() Returns the protocol and version of the request as a string of the form <protocol>/<major version>.
java.lang.String	getQueryString() Gets any query string that is part of the HTTP request URI.
byte[]	getRawData()
java.io.BufferedReader	getReader() Returns a buffered reader for reading text in the request body.
java.lang.String	getRealPath(java.lang.String path) Applies alias rules to the specified virtual path and returns the corresponding real path, or null if the translation can not be performed for any reason.
java.lang.String	getRemoteAddr() Returns the IP address of the agent that sent the request.
java.lang.String	getRemoteHost() Returns the fully qualified host name of the agent that sent the request.
java.lang.String	getRemoteUser() Gets the name of the user making this request.
javax.servlet.RequestDispatcher	getRequestDispatcher(java.lang.String path)
java.lang.String	getRequestedSessionId() Gets the session id specified with this request.
java.lang.String	getRequestURI() Gets, from the first line of the HTTP request, the part of this request's URI that is to the left of any query string.
java.lang.StringBuffer	getRequestURL()
java.lang.String	getScheme() Returns the scheme of the URL used in this request, for example "http", "https", or "ftp".
java.lang.String	getServerName() Returns the host name of the server that received the request.
int	getServerPort() Returns the port number on which this request was received.
java.lang.String	getServletPath() Gets the part of this request's URI that refers to the servlet being invoked.
javax.servlet.http.HttpSession	getSession()
javax.servlet.http.HttpSession	getSession(boolean create) Gets the current valid session associated with this request, if create is false or, if necessary, creates a new session for the request, if create is true.
java.security.Principal	getUserPrincipal()
boolean	isContentParameter(java.lang.String parameterName)
boolean	isNormalParameter(java.lang.String parameterName)
boolean	isRequestedSessionIdFromCookie() Checks whether the session id specified by this request came in as a cookie.
boolean	isRequestedSessionIdFromUrl() Checks whether the session id specified by this request came in as part of the URL.
boolean	isRequestedSessionIdFromURL()
boolean	isRequestedSessionIdValid() Checks whether this request is associated with a session that is valid in the current session context.
boolean	isSecure()
boolean	isUserInRole(java.lang.String role)
void	removeAttribute(java.lang.String name)
void	setAttribute(java.lang.String name, java.lang.Object value)
void	setCharacterEncoding(java.lang.String encoding)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MultipartRequest

public MultipartRequest(javax.servlet.http.HttpServletRequest request)
                 throws java.io.IOException

creates a new MultipartRequest instance from the given HttpServletRequest with the default maximum allowed size.

Parameters:

request - the original HttpServletRequest

Throws:

java.io.IOException - if parts needed to process the request have not been included in it or maximum size has been exceeded

MultipartRequest

public MultipartRequest(javax.servlet.http.HttpServletRequest request,
                        int maximumSize)
                 throws java.io.IOException

creates a new MultipartRequest instance from the given HttpServletRequest with the given maximum allowed size.

Parameters:

request - the original HttpServletRequest

maximumSize - the new maximum allowed size for content length

Throws:

java.io.IOException - if parts needed to process the request have not been included in it or maximum size has been exceeded

Method Detail

getBoundary

public java.lang.String getBoundary()

the boundary returned by this method is the boundary extracted from the original request plus a leading "--"

Returns:

the boundary string of this request

getParameter

public java.lang.String getParameter(java.lang.String parameterName)

Returns a string containing the lone value of the specified parameter, or null if the parameter does not exist. For example, in an HTTP servlet this method would return the value of the specified query string parameter. Servlet writers should use this method only when they are sure that there is only one value for the parameter. If the parameter has (or could have) multiple values, servlet writers should use getParameterValues. If a multiple valued parameter name is passed as an argument, the return value is implementation dependent. Note: This only works for parameters containing text-based information.

Specified by:

getParameter in interface javax.servlet.ServletRequest

See Also:

getParameterValues(java.lang.String)

getParameterValues

public java.lang.String[] getParameterValues(java.lang.String parameterName)

Returns the values of the specified parameter for the request as an array of strings, or null if the named parameter does not exist. For example, in an HTTP servlet this method would return the values of the specified query string or posted form as an array of strings. Note: This only works for parameters containing text-based information.

Specified by:

getParameterValues in interface javax.servlet.ServletRequest

See Also:

ServletRequest.getParameter(java.lang.String)

getParameterContent

public byte[] getParameterContent(java.lang.String parameterName)

Parameters:

parameterName - the name of the parameter

Returns:

an array of bytes representing the content uploaded by the request for this parameter, null if parameter is text-based

getParameterContentType

public java.lang.String getParameterContentType(java.lang.String parameterName)

Parameters:

parameterName - the name of the parameter

Returns:

this parameters content type if it is uploaded content, null otherwise

getParameterContentFileName

public java.lang.String getParameterContentFileName(java.lang.String parameterName)

Parameters:

parameterName - the name of the parameter

Returns:

the original file name of the parameter's content, null if the parameter holds text-based information

isNormalParameter

public boolean isNormalParameter(java.lang.String parameterName)

Parameters:

parameterName - the name of the parameter

Returns:

true if the named parameter holds text-based information, false otherwise

isContentParameter

public boolean isContentParameter(java.lang.String parameterName)

Parameters:

parameterName - the name of the parameter

Returns:

true if the named parameter holds uploaded content, false otherwise

getParameterNames

public java.util.Enumeration getParameterNames()

Returns the parameter names for this request as an enumeration of strings, or an empty enumeration if there are no parameters or the input stream is empty. The input stream would be empty if all the data had been read from the stream returned by the method getInputStream.

Specified by:

getParameterNames in interface javax.servlet.ServletRequest

getCookies

public javax.servlet.http.Cookie[] getCookies()

Gets the array of cookies found in this request.

Specified by:

getCookies in interface javax.servlet.http.HttpServletRequest

Returns:

the array of cookies found in this request

getMethod

public java.lang.String getMethod()

Gets the HTTP method (for example, GET, POST, PUT) with which this request was made. Same as the CGI variable REQUEST_METHOD.

Specified by:

getMethod in interface javax.servlet.http.HttpServletRequest

Returns:

the HTTP method with which this request was made

getRequestURI

public java.lang.String getRequestURI()

Gets, from the first line of the HTTP request, the part of this request's URI that is to the left of any query string. For example,

First line of HTTP request		Return from getRequestURI
POST /some/path.html HTTP/1.1		/some/path.html
GET http://foo.bar/a.html HTTP/1.0		http://foo.bar/a.html
HEAD /xyz?a=b HTTP/1.1		/xyz

To reconstruct a URL with a URL scheme and host, use the method javax.servlet.http.HttpUtils.getRequestURL, which returns a StringBuffer.

Specified by:

getRequestURI in interface javax.servlet.http.HttpServletRequest

Returns:

this request's URI

See Also:

HttpUtils.getRequestURL(javax.servlet.http.HttpServletRequest)

getServletPath

public java.lang.String getServletPath()

Gets the part of this request's URI that refers to the servlet being invoked. Analogous to the CGI variable SCRIPT_NAME.

Specified by:

getServletPath in interface javax.servlet.http.HttpServletRequest

Returns:

the servlet being invoked, as contained in this request's URI

getPathInfo

public java.lang.String getPathInfo()

Gets any optional extra path information following the servlet path of this request's URI, but immediately preceding its query string. Same as the CGI variable PATH_INFO.

Specified by:

getPathInfo in interface javax.servlet.http.HttpServletRequest

Returns:

the optional path information following the servlet path, but before the query string, in this request's URI; null if this request's URI contains no extra path information

getPathTranslated

public java.lang.String getPathTranslated()

Gets any optional extra path information following the servlet path of this request's URI, but immediately preceding its query string, and translates it to a real path. Similar to the CGI variable PATH_TRANSLATED

Specified by:

getPathTranslated in interface javax.servlet.http.HttpServletRequest

Returns:

extra path information translated to a real path or null if no extra path information is in the request's URI

getQueryString

public java.lang.String getQueryString()

Gets any query string that is part of the HTTP request URI. Same as the CGI variable QUERY_STRING.

Specified by:

getQueryString in interface javax.servlet.http.HttpServletRequest

Returns:

query string that is part of this request's URI, or null if it contains no query string

getRemoteUser

public java.lang.String getRemoteUser()

Gets the name of the user making this request. The user name is set with HTTP authentication. Whether the user name will continue to be sent with each subsequent communication is browser-dependent. Same as the CGI variable REMOTE_USER.

Specified by:

getRemoteUser in interface javax.servlet.http.HttpServletRequest

Returns:

the name of the user making this request, or null if not known.

getAuthType

public java.lang.String getAuthType()

Gets the authentication scheme of this request. Same as the CGI variable AUTH_TYPE.

Specified by:

getAuthType in interface javax.servlet.http.HttpServletRequest

Returns:

this request's authentication scheme, or null if none.

getHeader

public java.lang.String getHeader(java.lang.String name)

Gets the value of the requested header field of this request. The case of the header field name is ignored.

Specified by:

getHeader in interface javax.servlet.http.HttpServletRequest

Parameters:

name - the String containing the name of the requested header field

Returns:

the value of the requested header field, or null if not known.

getIntHeader

public int getIntHeader(java.lang.String name)

Gets the value of the specified integer header field of this request. The case of the header field name is ignored. If the header can't be converted to an integer, the method throws a NumberFormatException.

Specified by:

getIntHeader in interface javax.servlet.http.HttpServletRequest

Parameters:

name - the String containing the name of the requested header field

Returns:

the value of the requested header field, or -1 if not found.

getDateHeader

public long getDateHeader(java.lang.String name)

Gets the value of the requested date header field of this request. If the header can't be converted to a date, the method throws an IllegalArgumentException. The case of the header field name is ignored.

Specified by:

getDateHeader in interface javax.servlet.http.HttpServletRequest

Parameters:

name - the String containing the name of the requested header field

Returns:

the value the requested date header field, or -1 if not found.

getHeaderNames

public java.util.Enumeration getHeaderNames()

Gets the header names for this request.

Specified by:

getHeaderNames in interface javax.servlet.http.HttpServletRequest

Returns:

an enumeration of strings representing the header names for this request. Some server implementations do not allow headers to be accessed in this way, in which case this method will return null.

getSession

public javax.servlet.http.HttpSession getSession(boolean create)

Gets the current valid session associated with this request, if create is false or, if necessary, creates a new session for the request, if create is true.

Note: to ensure the session is properly maintained, the servlet developer must call this method (at least once) before any output is written to the response.

Additionally, application-writers need to be aware that newly created sessions (that is, sessions for which HttpSession.isNew returns true) do not have any application-specific state.

Specified by:

getSession in interface javax.servlet.http.HttpServletRequest

Returns:

the session associated with this request or null if create was false and no valid session is associated with this request.

getSession

public javax.servlet.http.HttpSession getSession()

Specified by:

getSession in interface javax.servlet.http.HttpServletRequest

getRequestedSessionId

public java.lang.String getRequestedSessionId()

Gets the session id specified with this request. This may differ from the actual session id. For example, if the request specified an id for an invalid session, then this will get a new session with a new id.

Specified by:

getRequestedSessionId in interface javax.servlet.http.HttpServletRequest

Returns:

the session id specified by this request, or null if the request did not specify a session id

See Also:

isRequestedSessionIdValid()

isRequestedSessionIdValid

public boolean isRequestedSessionIdValid()

Checks whether this request is associated with a session that is valid in the current session context. If it is not valid, the requested session will never be returned from the getSession method.

Specified by:

isRequestedSessionIdValid in interface javax.servlet.http.HttpServletRequest

Returns:

true if this request is assocated with a session that is valid in the current session context.

See Also:

getRequestedSessionId(), HttpSessionContext, getSession(boolean)

isRequestedSessionIdFromCookie

public boolean isRequestedSessionIdFromCookie()

Checks whether the session id specified by this request came in as a cookie. (The requested session may not be one returned by the getSession method.)

Specified by:

isRequestedSessionIdFromCookie in interface javax.servlet.http.HttpServletRequest

Returns:

true if the session id specified by this request came in as a cookie; false otherwise

See Also:

getSession(boolean)

isRequestedSessionIdFromUrl

public boolean isRequestedSessionIdFromUrl()

Checks whether the session id specified by this request came in as part of the URL. (The requested session may not be the one returned by the getSession method.)

Specified by:

isRequestedSessionIdFromUrl in interface javax.servlet.http.HttpServletRequest

Returns:

true if the session id specified by the request for this session came in as part of the URL; false otherwise

See Also:

getSession(boolean)

getContentLength

public int getContentLength()

Returns the size of the request entity data, or -1 if not known. Same as the CGI variable CONTENT_LENGTH.

Specified by:

getContentLength in interface javax.servlet.ServletRequest

getContentType

public java.lang.String getContentType()

Returns the Internet Media Type of the request entity data, or null if not known. Same as the CGI variable CONTENT_TYPE.

Specified by:

getContentType in interface javax.servlet.ServletRequest

getProtocol

public java.lang.String getProtocol()

Returns the protocol and version of the request as a string of the form <protocol>/<major version>.<minor version>. Same as the CGI variable SERVER_PROTOCOL.

Specified by:

getProtocol in interface javax.servlet.ServletRequest

getScheme

public java.lang.String getScheme()

Returns the scheme of the URL used in this request, for example "http", "https", or "ftp". Different schemes have different rules for constructing URLs, as noted in RFC 1738. The URL used to create a request may be reconstructed using this scheme, the server name and port, and additional information such as URIs.

Specified by:

getScheme in interface javax.servlet.ServletRequest

getServerName

public java.lang.String getServerName()

Returns the host name of the server that received the request. Same as the CGI variable SERVER_NAME.

Specified by:

getServerName in interface javax.servlet.ServletRequest

getServerPort

public int getServerPort()

Returns the port number on which this request was received. Same as the CGI variable SERVER_PORT.

Specified by:

getServerPort in interface javax.servlet.ServletRequest

getRemoteAddr

public java.lang.String getRemoteAddr()

Returns the IP address of the agent that sent the request. Same as the CGI variable REMOTE_ADDR.

Specified by:

getRemoteAddr in interface javax.servlet.ServletRequest

getRemoteHost

public java.lang.String getRemoteHost()

Returns the fully qualified host name of the agent that sent the request. Same as the CGI variable REMOTE_HOST.

Specified by:

getRemoteHost in interface javax.servlet.ServletRequest

getRealPath

public java.lang.String getRealPath(java.lang.String path)

Applies alias rules to the specified virtual path and returns the corresponding real path, or null if the translation can not be performed for any reason. For example, an HTTP servlet would resolve the path using the virtual docroot, if virtual hosting is enabled, and with the default docroot otherwise. Calling this method with the string "/" as an argument returns the document root.

Specified by:

getRealPath in interface javax.servlet.ServletRequest

Parameters:

path - the virtual path to be translated to a real path

getInputStream

public javax.servlet.ServletInputStream getInputStream()
                                                throws java.io.IOException

Returns an input stream for reading binary data in the request body.

Specified by:

getInputStream in interface javax.servlet.ServletRequest

Throws:

java.lang.IllegalStateException - if getReader has been called on this same request.

java.io.IOException - on other I/O related errors.

See Also:

getReader()

getAttribute

public java.lang.Object getAttribute(java.lang.String name)

Returns the value of the named attribute of the request, or null if the attribute does not exist. This method allows access to request information not already provided by the other methods in this interface. Attribute names should follow the same convention as package names. The following predefined attributes are provided.

Attribute Name	Attribute Type	Description
javax.net.ssl.cipher_suite	string	The string name of the SSL cipher suite in use, if the request was made using SSL
javax.net.ssl.peer_certificates	array of javax.security.cert.X509Certificate	The chain of X.509 certificates which authenticates the client. This is only available when SSL is used with client authentication is used.
javax.net.ssl.session	javax.net.ssl.SSLSession	An SSL session object, if the request was made using SSL.

The package (and hence attribute) names beginning with java.*, and javax.* are reserved for use by Javasoft. Similarly, com.sun.* is reserved for use by Sun Microsystems.

Specified by:

getAttribute in interface javax.servlet.ServletRequest

Parameters:

name - the name of the attribute whose value is required

getReader

public java.io.BufferedReader getReader()
                                 throws java.io.IOException

Returns a buffered reader for reading text in the request body. This translates character set encodings as appropriate.

Specified by:

getReader in interface javax.servlet.ServletRequest

Throws:

java.io.UnsupportedEncodingException - if the character set encoding is unsupported, so the text can't be correctly decoded.

java.lang.IllegalStateException - if getInputStream has been called on this same request.

java.io.IOException - on other I/O related errors.

See Also:

getInputStream()

isRequestedSessionIdFromURL

public boolean isRequestedSessionIdFromURL()

Specified by:

isRequestedSessionIdFromURL in interface javax.servlet.http.HttpServletRequest

getCharacterEncoding

public java.lang.String getCharacterEncoding()

Returns the character set encoding for the input of this request.

Specified by:

getCharacterEncoding in interface javax.servlet.ServletRequest

getContextPath

public java.lang.String getContextPath()

Specified by:

getContextPath in interface javax.servlet.http.HttpServletRequest

getAttributeNames

public java.util.Enumeration getAttributeNames()

Specified by:

getAttributeNames in interface javax.servlet.ServletRequest

getHeaders

public java.util.Enumeration getHeaders(java.lang.String name)

Specified by:

getHeaders in interface javax.servlet.http.HttpServletRequest

getLocale

public java.util.Locale getLocale()

Specified by:

getLocale in interface javax.servlet.ServletRequest

getLocales

public java.util.Enumeration getLocales()

Specified by:

getLocales in interface javax.servlet.ServletRequest

getRequestDispatcher

public javax.servlet.RequestDispatcher getRequestDispatcher(java.lang.String path)

Specified by:

getRequestDispatcher in interface javax.servlet.ServletRequest

getRequestURL

public java.lang.StringBuffer getRequestURL()

Specified by:

getRequestURL in interface javax.servlet.http.HttpServletRequest

isSecure

public boolean isSecure()

Specified by:

isSecure in interface javax.servlet.ServletRequest

isUserInRole

public boolean isUserInRole(java.lang.String role)

Specified by:

isUserInRole in interface javax.servlet.http.HttpServletRequest

getUserPrincipal

public java.security.Principal getUserPrincipal()

Specified by:

getUserPrincipal in interface javax.servlet.http.HttpServletRequest

getParameterMap

public java.util.Map getParameterMap()

Specified by:

getParameterMap in interface javax.servlet.ServletRequest

setAttribute

public void setAttribute(java.lang.String name,
                         java.lang.Object value)

Specified by:

setAttribute in interface javax.servlet.ServletRequest

removeAttribute

public void removeAttribute(java.lang.String name)

Specified by:

removeAttribute in interface javax.servlet.ServletRequest

setCharacterEncoding

public void setCharacterEncoding(java.lang.String encoding)
                          throws java.io.UnsupportedEncodingException

Specified by:

setCharacterEncoding in interface javax.servlet.ServletRequest

java.io.UnsupportedEncodingException

getRawData

public byte[] getRawData()