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javax.servlet.http Interface HttpServletResponse
- All Known Implementing Classes:
- HttpServletResponseWrapper
- public abstract interface HttpServletResponse
- extends ServletResponse
Extends the ServletResponse
interface 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 HttpServletRequest
object
and passes it as an argument to the servlet's service methods
(doGet
, doPost
, etc).
- See Also:
ServletResponse
Field Summary | |
static int |
SC_ACCEPTED
Status code (202) indicating that a request was accepted for processing, but was not completed. |
static 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. |
static int |
SC_BAD_REQUEST
Status code (400) indicating the request sent by the client was syntactically incorrect. |
static 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. |
static int |
SC_CONTINUE
Status code (100) indicating the client can continue. |
static int |
SC_CREATED
Status code (201) indicating the request succeeded and created a new resource on the server. |
static int |
SC_EXPECTATION_FAILED
Status code (417) indicating that the server could not meet the expectation given in the Expect request header. |
static int |
SC_FORBIDDEN
Status code (403) indicating the server understood the request but refused to fulfill it. |
static 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. |
static int |
SC_GONE
Status code (410) indicating that the resource is no longer available at the server and no forwarding address is known. |
static 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. |
static int |
SC_INTERNAL_SERVER_ERROR
Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request. |
static int |
SC_LENGTH_REQUIRED
Status code (411) indicating that the request cannot be handled without a defined Content-Length . |
static int |
SC_METHOD_NOT_ALLOWED
Status code (405) indicating that the method specified in the Request-Line is not allowed for the resource
identified by the Request-URI . |
static 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. |
static 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. |
static 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. |
static int |
SC_NO_CONTENT
Status code (204) indicating that the request succeeded but that there was no new information to return. |
static int |
SC_NON_AUTHORITATIVE_INFORMATION
Status code (203) indicating that the meta information presented by the client did not originate from the server. |
static 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 headerssent in the request. |
static int |
SC_NOT_FOUND
Status code (404) indicating that the requested resource is not available. |
static int |
SC_NOT_IMPLEMENTED
Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request. |
static int |
SC_NOT_MODIFIED
Status code (304) indicating that a conditional GET operation found that the resource was available and not modified. |
static int |
SC_OK
Status code (200) indicating the request succeeded normally. |
static int |
SC_PARTIAL_CONTENT
Status code (206) indicating that the server has fulfilled the partial GET request for the resource. |
static int |
SC_PAYMENT_REQUIRED
Status code (402) reserved for future use. |
static 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. |
static int |
SC_PROXY_AUTHENTICATION_REQUIRED
Status code (407) indicating that the client MUST first authenticate itself with the proxy. |
static 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. |
static int |
SC_REQUEST_TIMEOUT
Status code (408) indicating that the client did not produce a requestwithin the time that the server was prepared to wait. |
static int |
SC_REQUEST_URI_TOO_LONG
Status code (414) indicating that the server is refusing to service the request because the Request-URI is longer
than the server is willing to interpret. |
static int |
SC_REQUESTED_RANGE_NOT_SATISFIABLE
Status code (416) indicating that the server cannot serve the requested byte range. |
static int |
SC_RESET_CONTENT
Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent. |
static int |
SC_SEE_OTHER
Status code (303) indicating that the response to the request can be found under a different URI. |
static int |
SC_SERVICE_UNAVAILABLE
Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request. |
static int |
SC_SWITCHING_PROTOCOLS
Status code (101) indicating the server is switching protocols according to Upgrade header. |
static int |
SC_TEMPORARY_REDIRECT
Status code (307) indicating that the requested resource resides temporarily under a different URI. |
static int |
SC_UNAUTHORIZED
Status code (401) indicating that the request requires HTTP authentication. |
static 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. |
static int |
SC_USE_PROXY
Status code (305) indicating that the requested resource MUST be accessed through the proxy given by the Location field. |
Method Summary | |
void |
addCookie(Cookie cookie)
Adds the specified cookie to the response. |
void |
addDateHeader(java.lang.String name,
long date)
Adds a response header with the given name and date-value. |
void |
addHeader(java.lang.String name,
java.lang.String value)
Adds a response header with the given name and value. |
void |
addIntHeader(java.lang.String name,
int value)
Adds a response header with the given name and integer value. |
boolean |
containsHeader(java.lang.String name)
Returns a boolean indicating whether the named response header has already been set. |
java.lang.String |
encodeRedirectUrl(java.lang.String url)
Deprecated. As of version 2.1, use encodeRedirectURL(String url) instead |
java.lang.String |
encodeRedirectURL(java.lang.String url)
Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed,
returns the URL unchanged. |
java.lang.String |
encodeUrl(java.lang.String url)
Deprecated. As of version 2.1, use encodeURL(String url) instead |
java.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. |
void |
sendError(int sc)
Sends an error response to the client using the specified status code and clearing the buffer. |
void |
sendError(int sc,
java.lang.String msg)
Sends an error response to the client using the specified status clearing the buffer. |
void |
sendRedirect(java.lang.String location)
Sends a temporary redirect response to the client using the specified redirect location URL. |
void |
setDateHeader(java.lang.String name,
long date)
Sets a response header with the given name and date-value. |
void |
setHeader(java.lang.String name,
java.lang.String value)
Sets a response header with the given name and value. |
void |
setIntHeader(java.lang.String name,
int value)
Sets a response header with the given name and integer value. |
void |
setStatus(int sc)
Sets the status code for this response. |
void |
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 use setStatus(int) , to send an error with a description
use sendError(int, String) .
Sets the status code and message for this response. |
Methods inherited from interface javax.servlet.ServletResponse |
flushBuffer,
getBufferSize,
getCharacterEncoding,
getLocale,
getOutputStream,
getWriter,
isCommitted,
reset,
resetBuffer,
setBufferSize,
setContentLength,
setContentType,
setLocale |
Field Detail |
SC_CONTINUE
public static final int SC_CONTINUE
- Status code (100) indicating the client can continue.
SC_SWITCHING_PROTOCOLS
public static final int SC_SWITCHING_PROTOCOLS
- Status code (101) indicating the server is switching protocols according to Upgrade header.
SC_OK
public static final int SC_OK
- Status code (200) indicating the request succeeded normally.
SC_CREATED
public static final int SC_CREATED
- Status code (201) indicating the request succeeded and created a new resource on the server.
SC_ACCEPTED
public static final int SC_ACCEPTED
- Status code (202) indicating that a request was accepted for processing, but was not completed.
SC_NON_AUTHORITATIVE_INFORMATION
public static final int SC_NON_AUTHORITATIVE_INFORMATION
- Status code (203) indicating that the meta information presented by the client did not originate from the server.
SC_NO_CONTENT
public static final int SC_NO_CONTENT
- Status code (204) indicating that the request succeeded but that there was no new information to return.
SC_RESET_CONTENT
public static final int SC_RESET_CONTENT
- Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.
SC_PARTIAL_CONTENT
public static final int SC_PARTIAL_CONTENT
- Status code (206) indicating that the server has fulfilled the partial GET request for the resource.
SC_MULTIPLE_CHOICES
public static 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.
SC_MOVED_PERMANENTLY
public static 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.
SC_MOVED_TEMPORARILY
public static 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.
SC_SEE_OTHER
public static final int SC_SEE_OTHER
- Status code (303) indicating that the response to the request can be found under a different URI.
SC_NOT_MODIFIED
public static final int SC_NOT_MODIFIED
- Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.
SC_USE_PROXY
public static final int SC_USE_PROXY
- Status code (305) indicating that the requested resource
MUST be accessed through the proxy given by the
Location
field.
SC_TEMPORARY_REDIRECT
public static 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 the
Location
field in the response.
SC_BAD_REQUEST
public static final int SC_BAD_REQUEST
- Status code (400) indicating the request sent by the client was syntactically incorrect.
SC_UNAUTHORIZED
public static final int SC_UNAUTHORIZED
- Status code (401) indicating that the request requires HTTP authentication.
SC_PAYMENT_REQUIRED
public static final int SC_PAYMENT_REQUIRED
- Status code (402) reserved for future use.
SC_FORBIDDEN
public static final int SC_FORBIDDEN
- Status code (403) indicating the server understood the request but refused to fulfill it.
SC_NOT_FOUND
public static final int SC_NOT_FOUND
- Status code (404) indicating that the requested resource is not available.
SC_METHOD_NOT_ALLOWED
public static final int SC_METHOD_NOT_ALLOWED
- Status code (405) indicating that the method specified in the
Request-Line
is not allowed for the resource identified by theRequest-URI
.
SC_NOT_ACCEPTABLE
public static 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 headerssent in the request.
SC_PROXY_AUTHENTICATION_REQUIRED
public static final int SC_PROXY_AUTHENTICATION_REQUIRED
- Status code (407) indicating that the client MUST first authenticate itself with the proxy.
SC_REQUEST_TIMEOUT
public static final int SC_REQUEST_TIMEOUT
- Status code (408) indicating that the client did not produce a requestwithin the time that the server was prepared to wait.
SC_CONFLICT
public static 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.
SC_GONE
public static 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.
SC_LENGTH_REQUIRED
public static final int SC_LENGTH_REQUIRED
- Status code (411) indicating that the request cannot be handled
without a defined
Content-Length
.
SC_PRECONDITION_FAILED
public static 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.
SC_REQUEST_ENTITY_TOO_LARGE
public static 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.
SC_REQUEST_URI_TOO_LONG
public static final int SC_REQUEST_URI_TOO_LONG
- Status code (414) indicating that the server is refusing to service
the request because the
Request-URI
is longer than the server is willing to interpret.
SC_UNSUPPORTED_MEDIA_TYPE
public static 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.
SC_REQUESTED_RANGE_NOT_SATISFIABLE
public static final int SC_REQUESTED_RANGE_NOT_SATISFIABLE
- Status code (416) indicating that the server cannot serve the requested byte range.
SC_EXPECTATION_FAILED
public static final int SC_EXPECTATION_FAILED
- Status code (417) indicating that the server could not meet the expectation given in the Expect request header.
SC_INTERNAL_SERVER_ERROR
public static final int SC_INTERNAL_SERVER_ERROR
- Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.
SC_NOT_IMPLEMENTED
public static final int SC_NOT_IMPLEMENTED
- Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.
SC_BAD_GATEWAY
public static 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.
SC_SERVICE_UNAVAILABLE
public static final int SC_SERVICE_UNAVAILABLE
- Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.
SC_GATEWAY_TIMEOUT
public static 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.
SC_HTTP_VERSION_NOT_SUPPORTED
public static 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.
Method Detail |
addCookie
public void 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
containsHeader
public boolean containsHeader(java.lang.String name)
- Returns a boolean indicating whether the named response header has already been set.
- Parameters:
name
- the header name- Returns:
true
if the named response header has already been set;false
otherwise
encodeURL
public java.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.
encodeRedirectURL
public java.lang.String encodeRedirectURL(java.lang.String url)
- Encodes the specified URL for use in the
sendRedirect
method 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 seperate from theencodeURL
method.All URLs sent to the
HttpServletResponse.sendRedirect
method 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)
encodeUrl
public java.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.
encodeRedirectUrl
public java.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.
sendError
public void sendError(int sc, java.lang.String msg) throws java.io.IOException
- Sends an error response to the client using the specified
status clearing the 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 codemsg
- the descriptive message- Throws:
- java.io.IOException - If an input or output exception occurs
- IllegalStateException - If the response was committed
sendError
public void sendError(int sc) throws java.io.IOException
- Sends an error response to the client using the specified status
code and clearing the buffer.
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- Throws:
- java.io.IOException - If an input or output exception occurs
- IllegalStateException - If the response was committed before this method call
sendRedirect
public void sendRedirect(java.lang.String location) throws java.io.IOException
- Sends 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
- IllegalStateException - If the response was committed
setDateHeader
public void 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. The
containsHeader
method can be used to test for the presence of a header before setting its value. - Parameters:
name
- the name of the header to setvalue
- the assigned date value- See Also:
containsHeader(java.lang.String)
,addDateHeader(java.lang.String, long)
addDateHeader
public void 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 setvalue
- the additional date value- See Also:
setDateHeader(java.lang.String, long)
setHeader
public void 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. The
containsHeader
method can be used to test for the presence of a header before setting its value. - Parameters:
name
- the name of the headervalue
- the header value- See Also:
containsHeader(java.lang.String)
,addHeader(java.lang.String, java.lang.String)
addHeader
public void 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 headervalue
- the additional header value- See Also:
setHeader(java.lang.String, java.lang.String)
setIntHeader
public void 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. The
containsHeader
method can be used to test for the presence of a header before setting its value. - Parameters:
name
- the name of the headervalue
- the assigned integer value- See Also:
containsHeader(java.lang.String)
,addIntHeader(java.lang.String, int)
addIntHeader
public void 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 headervalue
- the assigned integer value- See Also:
setIntHeader(java.lang.String, int)
setStatus
public void 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
defined in the web applicaion, the sendError
method 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)
setStatus
public void 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
use
setStatus(int)
, to send an error with a description usesendError(int, String)
. Sets the status code and message for this response. - Parameters:
sc
- the status codesm
- the status message
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