Interface HttpServletResponse
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- All Superinterfaces:
- ServletResponse
 - All Known Implementing Classes:
- HttpServletResponseWrapper
 
 public interface HttpServletResponse extends ServletResponse Extends theServletResponseinterface to provide HTTP-specific functionality in sending a response. For example, it has methods to access HTTP headers and cookies.The servlet container creates an HttpServletResponseobject and passes it as an argument to the servlet's service methods (doGet,doPost, etc).- See Also:
- ServletResponse
 
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Field SummaryFields Modifier and Type Field Description static intSC_ACCEPTEDStatus code (202) indicating that a request was accepted for processing, but was not completed.static intSC_BAD_GATEWAYStatus code (502) indicating that the HTTP server received an invalid response from a server it consulted when acting as a proxy or gateway.static intSC_BAD_REQUESTStatus code (400) indicating the request sent by the client was syntactically incorrect.static intSC_CONFLICTStatus code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.static intSC_CONTINUEStatus code (100) indicating the client can continue.static intSC_CREATEDStatus code (201) indicating the request succeeded and created a new resource on the server.static intSC_EXPECTATION_FAILEDStatus code (417) indicating that the server could not meet the expectation given in the Expect request header.static intSC_FORBIDDENStatus code (403) indicating the server understood the request but refused to fulfill it.static intSC_FOUNDStatus code (302) indicating that the resource reside temporarily under a different URI.static intSC_GATEWAY_TIMEOUTStatus code (504) indicating that the server did not receive a timely response from the upstream server while acting as a gateway or proxy.static intSC_GONEStatus code (410) indicating that the resource is no longer available at the server and no forwarding address is known.static intSC_HTTP_VERSION_NOT_SUPPORTEDStatus code (505) indicating that the server does not support or refuses to support the HTTP protocol version that was used in the request message.static intSC_INTERNAL_SERVER_ERRORStatus code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.static intSC_LENGTH_REQUIREDStatus code (411) indicating that the request cannot be handled without a definedContent-Length.static intSC_METHOD_NOT_ALLOWEDStatus code (405) indicating that the method specified in theRequest-Lineis not allowed for the resource identified by theRequest-URI.static intSC_MOVED_PERMANENTLYStatus code (301) indicating that the resource has permanently moved to a new location, and that future references should use a new URI with their requests.static intSC_MOVED_TEMPORARILYStatus code (302) indicating that the resource has temporarily moved to another location, but that future references should still use the original URI to access the resource.static intSC_MULTIPLE_CHOICESStatus code (300) indicating that the requested resource corresponds to any one of a set of representations, each with its own specific location.static intSC_NO_CONTENTStatus code (204) indicating that the request succeeded but that there was no new information to return.static intSC_NON_AUTHORITATIVE_INFORMATIONStatus code (203) indicating that the meta information presented by the client did not originate from the server.static intSC_NOT_ACCEPTABLEStatus code (406) indicating that the resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.static intSC_NOT_FOUNDStatus code (404) indicating that the requested resource is not available.static intSC_NOT_IMPLEMENTEDStatus code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.static intSC_NOT_MODIFIEDStatus code (304) indicating that a conditional GET operation found that the resource was available and not modified.static intSC_OKStatus code (200) indicating the request succeeded normally.static intSC_PARTIAL_CONTENTStatus code (206) indicating that the server has fulfilled the partial GET request for the resource.static intSC_PAYMENT_REQUIREDStatus code (402) reserved for future use.static intSC_PRECONDITION_FAILEDStatus code (412) indicating that the precondition given in one or more of the request-header fields evaluated to false when it was tested on the server.static intSC_PROXY_AUTHENTICATION_REQUIREDStatus code (407) indicating that the client MUST first authenticate itself with the proxy.static intSC_REQUEST_ENTITY_TOO_LARGEStatus code (413) indicating that the server is refusing to process the request because the request entity is larger than the server is willing or able to process.static intSC_REQUEST_TIMEOUTStatus code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.static intSC_REQUEST_URI_TOO_LONGStatus code (414) indicating that the server is refusing to service the request because theRequest-URIis longer than the server is willing to interpret.static intSC_REQUESTED_RANGE_NOT_SATISFIABLEStatus code (416) indicating that the server cannot serve the requested byte range.static intSC_RESET_CONTENTStatus code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.static intSC_SEE_OTHERStatus code (303) indicating that the response to the request can be found under a different URI.static intSC_SERVICE_UNAVAILABLEStatus code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.static intSC_SWITCHING_PROTOCOLSStatus code (101) indicating the server is switching protocols according to Upgrade header.static intSC_TEMPORARY_REDIRECTStatus code (307) indicating that the requested resource resides temporarily under a different URI.static intSC_UNAUTHORIZEDStatus code (401) indicating that the request requires HTTP authentication.static intSC_UNSUPPORTED_MEDIA_TYPEStatus code (415) indicating that the server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method.static intSC_USE_PROXYStatus code (305) indicating that the requested resource MUST be accessed through the proxy given by theLocationfield.
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Method SummaryAll Methods Instance Methods Abstract Methods Deprecated Methods Modifier and Type Method Description voidaddCookie(Cookie cookie)Adds the specified cookie to the response.voidaddDateHeader(java.lang.String name, long date)Adds a response header with the given name and date-value.voidaddHeader(java.lang.String name, java.lang.String value)Adds a response header with the given name and value.voidaddIntHeader(java.lang.String name, int value)Adds a response header with the given name and integer value.booleancontainsHeader(java.lang.String name)Returns a boolean indicating whether the named response header has already been set.java.lang.StringencodeRedirectUrl(java.lang.String url)Deprecated.As of version 2.1, use encodeRedirectURL(String url) insteadjava.lang.StringencodeRedirectURL(java.lang.String url)Encodes the specified URL for use in thesendRedirectmethod or, if encoding is not needed, returns the URL unchanged.java.lang.StringencodeUrl(java.lang.String url)Deprecated.As of version 2.1, use encodeURL(String url) insteadjava.lang.StringencodeURL(java.lang.String url)Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged.java.lang.StringgetHeader(java.lang.String name)Return the value for the specified header, ornullif this header has not been set.java.util.Collection<java.lang.String>getHeaderNames()Get the header names set for this HTTP response.java.util.Collection<java.lang.String>getHeaders(java.lang.String name)Return a Collection of all the header values associated with the specified header name.intgetStatus()Get the HTTP status code for this Response.voidsendError(int sc)Sends an error response to the client using the specified status code and clears the buffer.voidsendError(int sc, java.lang.String msg)Sends an error response to the client using the specified status code and clears the output buffer.voidsendRedirect(java.lang.String location)Sends a temporary redirect response to the client using the specified redirect location URL.voidsetDateHeader(java.lang.String name, long date)Sets a response header with the given name and date-value.voidsetHeader(java.lang.String name, java.lang.String value)Sets a response header with the given name and value.voidsetIntHeader(java.lang.String name, int value)Sets a response header with the given name and integer value.voidsetStatus(int sc)Sets the status code for this response.voidsetStatus(int sc, java.lang.String sm)Deprecated.As of version 2.1, due to ambiguous meaning of the message parameter.- 
Methods inherited from interface javax.servlet.ServletResponseflushBuffer, getBufferSize, getCharacterEncoding, getContentType, getLocale, getOutputStream, getWriter, isCommitted, reset, resetBuffer, setBufferSize, setCharacterEncoding, setContentLength, setContentLengthLong, setContentType, setLocale
 
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Field Detail- 
SC_CONTINUEstatic final int SC_CONTINUE Status code (100) indicating the client can continue.- See Also:
- Constant Field Values
 
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SC_SWITCHING_PROTOCOLSstatic final int SC_SWITCHING_PROTOCOLS Status code (101) indicating the server is switching protocols according to Upgrade header.- See Also:
- Constant Field Values
 
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SC_OKstatic final int SC_OK Status code (200) indicating the request succeeded normally.- See Also:
- Constant Field Values
 
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SC_CREATEDstatic final int SC_CREATED Status code (201) indicating the request succeeded and created a new resource on the server.- See Also:
- Constant Field Values
 
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SC_ACCEPTEDstatic final int SC_ACCEPTED Status code (202) indicating that a request was accepted for processing, but was not completed.- See Also:
- Constant Field Values
 
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SC_NON_AUTHORITATIVE_INFORMATIONstatic final int SC_NON_AUTHORITATIVE_INFORMATION Status code (203) indicating that the meta information presented by the client did not originate from the server.- See Also:
- Constant Field Values
 
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SC_NO_CONTENTstatic final int SC_NO_CONTENT Status code (204) indicating that the request succeeded but that there was no new information to return.- See Also:
- Constant Field Values
 
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SC_RESET_CONTENTstatic final int SC_RESET_CONTENT Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.- See Also:
- Constant Field Values
 
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SC_PARTIAL_CONTENTstatic final int SC_PARTIAL_CONTENT Status code (206) indicating that the server has fulfilled the partial GET request for the resource.- See Also:
- Constant Field Values
 
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SC_MULTIPLE_CHOICESstatic final int SC_MULTIPLE_CHOICES Status code (300) indicating that the requested resource corresponds to any one of a set of representations, each with its own specific location.- See Also:
- Constant Field Values
 
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SC_MOVED_PERMANENTLYstatic final int SC_MOVED_PERMANENTLY Status code (301) indicating that the resource has permanently moved to a new location, and that future references should use a new URI with their requests.- See Also:
- Constant Field Values
 
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SC_MOVED_TEMPORARILYstatic final int SC_MOVED_TEMPORARILY Status code (302) indicating that the resource has temporarily moved to another location, but that future references should still use the original URI to access the resource. This definition is being retained for backwards compatibility. SC_FOUND is now the preferred definition.- See Also:
- Constant Field Values
 
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SC_FOUNDstatic final int SC_FOUND Status code (302) indicating that the resource reside temporarily under a different URI. Since the redirection might be altered on occasion, the client should continue to use the Request-URI for future requests.(HTTP/1.1) To represent the status code (302), it is recommended to use this variable.- See Also:
- Constant Field Values
 
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SC_SEE_OTHERstatic final int SC_SEE_OTHER Status code (303) indicating that the response to the request can be found under a different URI.- See Also:
- Constant Field Values
 
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SC_NOT_MODIFIEDstatic final int SC_NOT_MODIFIED Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.- See Also:
- Constant Field Values
 
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SC_USE_PROXYstatic final int SC_USE_PROXY Status code (305) indicating that the requested resource MUST be accessed through the proxy given by theLocationfield.- See Also:
- Constant Field Values
 
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SC_TEMPORARY_REDIRECTstatic final int SC_TEMPORARY_REDIRECT Status code (307) indicating that the requested resource resides temporarily under a different URI. The temporary URI SHOULD be given by theLocationfield in the response.- See Also:
- Constant Field Values
 
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SC_BAD_REQUESTstatic final int SC_BAD_REQUEST Status code (400) indicating the request sent by the client was syntactically incorrect.- See Also:
- Constant Field Values
 
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SC_UNAUTHORIZEDstatic final int SC_UNAUTHORIZED Status code (401) indicating that the request requires HTTP authentication.- See Also:
- Constant Field Values
 
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SC_PAYMENT_REQUIREDstatic final int SC_PAYMENT_REQUIRED Status code (402) reserved for future use.- See Also:
- Constant Field Values
 
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SC_FORBIDDENstatic final int SC_FORBIDDEN Status code (403) indicating the server understood the request but refused to fulfill it.- See Also:
- Constant Field Values
 
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SC_NOT_FOUNDstatic final int SC_NOT_FOUND Status code (404) indicating that the requested resource is not available.- See Also:
- Constant Field Values
 
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SC_METHOD_NOT_ALLOWEDstatic final int SC_METHOD_NOT_ALLOWED Status code (405) indicating that the method specified in theRequest-Lineis not allowed for the resource identified by theRequest-URI.- See Also:
- Constant Field Values
 
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SC_NOT_ACCEPTABLEstatic final int SC_NOT_ACCEPTABLE Status code (406) indicating that the resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.- See Also:
- Constant Field Values
 
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SC_PROXY_AUTHENTICATION_REQUIREDstatic final int SC_PROXY_AUTHENTICATION_REQUIRED Status code (407) indicating that the client MUST first authenticate itself with the proxy.- See Also:
- Constant Field Values
 
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SC_REQUEST_TIMEOUTstatic final int SC_REQUEST_TIMEOUT Status code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.- See Also:
- Constant Field Values
 
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SC_CONFLICTstatic final int SC_CONFLICT Status code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.- See Also:
- Constant Field Values
 
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SC_GONEstatic final int SC_GONE Status code (410) indicating that the resource is no longer available at the server and no forwarding address is known. This condition SHOULD be considered permanent.- See Also:
- Constant Field Values
 
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SC_LENGTH_REQUIREDstatic final int SC_LENGTH_REQUIRED Status code (411) indicating that the request cannot be handled without a definedContent-Length.- See Also:
- Constant Field Values
 
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SC_PRECONDITION_FAILEDstatic final int SC_PRECONDITION_FAILED Status code (412) indicating that the precondition given in one or more of the request-header fields evaluated to false when it was tested on the server.- See Also:
- Constant Field Values
 
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SC_REQUEST_ENTITY_TOO_LARGEstatic final int SC_REQUEST_ENTITY_TOO_LARGE Status code (413) indicating that the server is refusing to process the request because the request entity is larger than the server is willing or able to process.- See Also:
- Constant Field Values
 
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SC_REQUEST_URI_TOO_LONGstatic final int SC_REQUEST_URI_TOO_LONG Status code (414) indicating that the server is refusing to service the request because theRequest-URIis longer than the server is willing to interpret.- See Also:
- Constant Field Values
 
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SC_UNSUPPORTED_MEDIA_TYPEstatic final int SC_UNSUPPORTED_MEDIA_TYPE Status code (415) indicating that the server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method.- See Also:
- Constant Field Values
 
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SC_REQUESTED_RANGE_NOT_SATISFIABLEstatic final int SC_REQUESTED_RANGE_NOT_SATISFIABLE Status code (416) indicating that the server cannot serve the requested byte range.- See Also:
- Constant Field Values
 
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SC_EXPECTATION_FAILEDstatic final int SC_EXPECTATION_FAILED Status code (417) indicating that the server could not meet the expectation given in the Expect request header.- See Also:
- Constant Field Values
 
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SC_INTERNAL_SERVER_ERRORstatic final int SC_INTERNAL_SERVER_ERROR Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.- See Also:
- Constant Field Values
 
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SC_NOT_IMPLEMENTEDstatic final int SC_NOT_IMPLEMENTED Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.- See Also:
- Constant Field Values
 
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SC_BAD_GATEWAYstatic final int SC_BAD_GATEWAY Status code (502) indicating that the HTTP server received an invalid response from a server it consulted when acting as a proxy or gateway.- See Also:
- Constant Field Values
 
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SC_SERVICE_UNAVAILABLEstatic final int SC_SERVICE_UNAVAILABLE Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.- See Also:
- Constant Field Values
 
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SC_GATEWAY_TIMEOUTstatic final int SC_GATEWAY_TIMEOUT Status code (504) indicating that the server did not receive a timely response from the upstream server while acting as a gateway or proxy.- See Also:
- Constant Field Values
 
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SC_HTTP_VERSION_NOT_SUPPORTEDstatic final int SC_HTTP_VERSION_NOT_SUPPORTED Status code (505) indicating that the server does not support or refuses to support the HTTP protocol version that was used in the request message.- See Also:
- Constant Field Values
 
 
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Method Detail- 
addCookievoid addCookie(Cookie cookie) Adds the specified cookie to the response. This method can be called multiple times to set more than one cookie.- Parameters:
- cookie- the Cookie to return to the client
 
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containsHeaderboolean containsHeader(java.lang.String name) Returns a boolean indicating whether the named response header has already been set.- Parameters:
- name- the header name
- Returns:
- trueif the named response header has already been set;- falseotherwise
 
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encodeURLjava.lang.String encodeURL(java.lang.String url) Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged. The implementation of this method includes the logic to determine whether the session ID needs to be encoded in the URL. For example, if the browser supports cookies, or session tracking is turned off, URL encoding is unnecessary.For robust session tracking, all URLs emitted by a servlet should be run through this method. Otherwise, URL rewriting cannot be used with browsers which do not support cookies. - Parameters:
- url- the url to be encoded.
- Returns:
- the encoded URL if encoding is needed; the unchanged URL otherwise.
 
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encodeRedirectURLjava.lang.String encodeRedirectURL(java.lang.String url) Encodes the specified URL for use in thesendRedirectmethod or, if encoding is not needed, returns the URL unchanged. The implementation of this method includes the logic to determine whether the session ID needs to be encoded in the URL. Because the rules for making this determination can differ from those used to decide whether to encode a normal link, this method is separated from theencodeURLmethod.All URLs sent to the HttpServletResponse.sendRedirectmethod should be run through this method. Otherwise, URL rewriting cannot be used with browsers which do not support cookies.- Parameters:
- url- the url to be encoded.
- Returns:
- the encoded URL if encoding is needed; the unchanged URL otherwise.
- See Also:
- sendRedirect(java.lang.String),- encodeUrl(java.lang.String)
 
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encodeUrljava.lang.String encodeUrl(java.lang.String url) Deprecated.As of version 2.1, use encodeURL(String url) instead- Parameters:
- url- the url to be encoded.
- Returns:
- the encoded URL if encoding is needed; the unchanged URL otherwise.
 
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encodeRedirectUrljava.lang.String encodeRedirectUrl(java.lang.String url) Deprecated.As of version 2.1, use encodeRedirectURL(String url) instead- Parameters:
- url- the url to be encoded.
- Returns:
- the encoded URL if encoding is needed; the unchanged URL otherwise.
 
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sendErrorvoid sendError(int sc, java.lang.String msg) throws java.io.IOExceptionSends an error response to the client using the specified status code and clears the output buffer. The server defaults to creating the response to look like an HTML-formatted server error page containing the specified message, setting the content type to "text/html", leaving cookies and other headers unmodified. If an error-page declaration has been made for the web application corresponding to the status code passed in, it will be served back in preference to the suggested msg parameter.If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to. - Parameters:
- sc- the error status code
- msg- the descriptive message
- Throws:
- java.io.IOException- If an input or output exception occurs
- java.lang.IllegalStateException- If the response was committed
 
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sendErrorvoid sendError(int sc) throws java.io.IOExceptionSends an error response to the client using the specified status code and clears the buffer. This is equivalent to callingsendError(int, String)with the same status code andnullfor the message.- Parameters:
- sc- the error status code
- Throws:
- java.io.IOException- If an input or output exception occurs
- java.lang.IllegalStateException- If the response was committed before this method call
 
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sendRedirectvoid sendRedirect(java.lang.String location) throws java.io.IOExceptionSends a temporary redirect response to the client using the specified redirect location URL. This method can accept relative URLs; the servlet container must convert the relative URL to an absolute URL before sending the response to the client. If the location is relative without a leading '/' the container interprets it as relative to the current request URI. If the location is relative with a leading '/' the container interprets it as relative to the servlet container root.If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to. - Parameters:
- location- the redirect location URL
- Throws:
- java.io.IOException- If an input or output exception occurs
- java.lang.IllegalStateException- If the response was committed or if a partial URL is given and cannot be converted into a valid URL
 
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setDateHeadervoid setDateHeader(java.lang.String name, long date)Sets a response header with the given name and date-value. The date is specified in terms of milliseconds since the epoch. If the header had already been set, the new value overwrites the previous one. ThecontainsHeadermethod can be used to test for the presence of a header before setting its value.- Parameters:
- name- the name of the header to set
- date- the assigned date value
- See Also:
- containsHeader(java.lang.String),- addDateHeader(java.lang.String, long)
 
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addDateHeadervoid addDateHeader(java.lang.String name, long date)Adds a response header with the given name and date-value. The date is specified in terms of milliseconds since the epoch. This method allows response headers to have multiple values.- Parameters:
- name- the name of the header to set
- date- the additional date value
- See Also:
- setDateHeader(java.lang.String, long)
 
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setHeadervoid setHeader(java.lang.String name, java.lang.String value)Sets a response header with the given name and value. If the header had already been set, the new value overwrites the previous one. ThecontainsHeadermethod can be used to test for the presence of a header before setting its value.- Parameters:
- name- the name of the header
- value- the header value If it contains octet string, it should be encoded according to RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt)
- See Also:
- containsHeader(java.lang.String),- addHeader(java.lang.String, java.lang.String)
 
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addHeadervoid addHeader(java.lang.String name, java.lang.String value)Adds a response header with the given name and value. This method allows response headers to have multiple values.- Parameters:
- name- the name of the header
- value- the additional header value If it contains octet string, it should be encoded according to RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt)
- See Also:
- setHeader(java.lang.String, java.lang.String)
 
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setIntHeadervoid setIntHeader(java.lang.String name, int value)Sets a response header with the given name and integer value. If the header had already been set, the new value overwrites the previous one. ThecontainsHeadermethod can be used to test for the presence of a header before setting its value.- Parameters:
- name- the name of the header
- value- the assigned integer value
- See Also:
- containsHeader(java.lang.String),- addIntHeader(java.lang.String, int)
 
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addIntHeadervoid addIntHeader(java.lang.String name, int value)Adds a response header with the given name and integer value. This method allows response headers to have multiple values.- Parameters:
- name- the name of the header
- value- the assigned integer value
- See Also:
- setIntHeader(java.lang.String, int)
 
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setStatusvoid setStatus(int sc) Sets the status code for this response. This method is used to set the return status code when there is no error (for example, for the status codes SC_OK or SC_MOVED_TEMPORARILY). If there is an error, and the caller wishes to invoke an error-page defined in the web application, thesendErrormethod should be used instead.The container clears the buffer and sets the Location header, preserving cookies and other headers. - Parameters:
- sc- the status code
- See Also:
- sendError(int, java.lang.String)
 
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setStatusvoid setStatus(int sc, java.lang.String sm)Deprecated.As of version 2.1, due to ambiguous meaning of the message parameter. To set a status code usesetStatus(int), to send an error with a description usesendError(int, String).Sets the status code and message for this response.- Parameters:
- sc- the status code
- sm- the status message
 
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getStatusint getStatus() Get the HTTP status code for this Response.- Returns:
- The HTTP status code for this Response
- Since:
- Servlet 3.0
 
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getHeaderjava.lang.String getHeader(java.lang.String name) Return the value for the specified header, ornullif this header has not been set. If more than one value was added for this name, only the first is returned; usegetHeaders(String)to retrieve all of them.- Parameters:
- name- Header name to look up
- Returns:
- The first value for the specified header. This is the raw value so if multiple values are specified in the first header then they will be returned as a single header value .
- Since:
- Servlet 3.0
 
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getHeadersjava.util.Collection<java.lang.String> getHeaders(java.lang.String name) Return a Collection of all the header values associated with the specified header name.- Parameters:
- name- Header name to look up
- Returns:
- The values for the specified header. These are the raw values so if multiple values are specified in a single header that will be returned as a single header value.
- Since:
- Servlet 3.0
 
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getHeaderNamesjava.util.Collection<java.lang.String> getHeaderNames() Get the header names set for this HTTP response.- Returns:
- The header names set for this HTTP response.
- Since:
- Servlet 3.0
 
 
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