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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » javax.servlet.http 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


javax.servlet.http.HttpServletResponse

All known Subclasses:   javax.servlet.http.HttpServletResponseWrapper,  org.apache.catalina.connector.Response,  org.apache.catalina.core.DummyResponse,  org.apache.catalina.connector.ResponseFacade,
HttpServletResponse
public interface HttpServletResponse extends ServletResponse(Code)
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 HttpServletResponse object and passes it as an argument to the servlet's service methods (doGet, doPost, etc).
author:
   Various
version:
   $Version$
See Also:   javax.servlet.ServletResponse



Field Summary
final public static  intSC_ACCEPTED
     Status code (202) indicating that a request was accepted for processing, but was not completed.
final public static  intSC_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.
final public static  intSC_BAD_REQUEST
     Status code (400) indicating the request sent by the client was syntactically incorrect.
final public static  intSC_CONFLICT
     Status code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.
final public static  intSC_CONTINUE
     Status code (100) indicating the client can continue.
final public static  intSC_CREATED
     Status code (201) indicating the request succeeded and created a new resource on the server.
final public static  intSC_EXPECTATION_FAILED
     Status code (417) indicating that the server could not meet the expectation given in the Expect request header.
final public static  intSC_FORBIDDEN
     Status code (403) indicating the server understood the request but refused to fulfill it.
final public static  intSC_FOUND
     Status code (302) indicating that the resource reside temporarily under a different URI.
final public static  intSC_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.
final public static  intSC_GONE
     Status code (410) indicating that the resource is no longer available at the server and no forwarding address is known.
final public static  intSC_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.
final public static  intSC_INTERNAL_SERVER_ERROR
     Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.
final public static  intSC_LENGTH_REQUIRED
     Status code (411) indicating that the request cannot be handled without a defined Content-Length.
final public static  intSC_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.
final public static  intSC_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.
final public static  intSC_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.
final public static  intSC_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.
final public static  intSC_NON_AUTHORITATIVE_INFORMATION
     Status code (203) indicating that the meta information presented by the client did not originate from the server.
final public static  intSC_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.
final public static  intSC_NOT_FOUND
     Status code (404) indicating that the requested resource is not available.
final public static  intSC_NOT_IMPLEMENTED
     Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.
final public static  intSC_NOT_MODIFIED
     Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.
final public static  intSC_NO_CONTENT
     Status code (204) indicating that the request succeeded but that there was no new information to return.
final public static  intSC_OK
     Status code (200) indicating the request succeeded normally.
final public static  intSC_PARTIAL_CONTENT
     Status code (206) indicating that the server has fulfilled the partial GET request for the resource.
final public static  intSC_PAYMENT_REQUIRED
     Status code (402) reserved for future use.
final public static  intSC_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.
final public static  intSC_PROXY_AUTHENTICATION_REQUIRED
     Status code (407) indicating that the client MUST first authenticate itself with the proxy.
final public static  intSC_REQUESTED_RANGE_NOT_SATISFIABLE
     Status code (416) indicating that the server cannot serve the requested byte range.
final public static  intSC_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.
final public static  intSC_REQUEST_TIMEOUT
     Status code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.
final public static  intSC_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.
final public static  intSC_RESET_CONTENT
     Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.
final public static  intSC_SEE_OTHER
     Status code (303) indicating that the response to the request can be found under a different URI.
final public static  intSC_SERVICE_UNAVAILABLE
     Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.
final public static  intSC_SWITCHING_PROTOCOLS
     Status code (101) indicating the server is switching protocols according to Upgrade header.
final public static  intSC_TEMPORARY_REDIRECT
     Status code (307) indicating that the requested resource resides temporarily under a different URI.
final public static  intSC_UNAUTHORIZED
     Status code (401) indicating that the request requires HTTP authentication.
final public static  intSC_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.
final public static  intSC_USE_PROXY
     Status code (305) indicating that the requested resource MUST be accessed through the proxy given by the Location field.


Method Summary
public  voidaddCookie(Cookie cookie)
     Adds the specified cookie to the response.
public  voidaddDateHeader(String name, long date)
     Adds a response header with the given name and date-value.
public  voidaddHeader(String name, String value)
     Adds a response header with the given name and value.
public  voidaddIntHeader(String name, int value)
     Adds a response header with the given name and integer value.
public  booleancontainsHeader(String name)
     Returns a boolean indicating whether the named response header has already been set.
public  StringencodeRedirectURL(String url)
     Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged.
public  StringencodeRedirectUrl(String url)
    
public  StringencodeURL(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.

public  StringencodeUrl(String url)
    
public  voidsendError(int sc, String msg)
     Sends an error response to the client using the specified status.
public  voidsendError(int sc)
     Sends an error response to the client using the specified status code and clearing the buffer.
public  voidsendRedirect(String location)
     Sends a temporary redirect response to the client using the specified redirect location URL.
public  voidsetDateHeader(String name, long date)
     Sets a response header with the given name and date-value.
public  voidsetHeader(String name, 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.
public  voidsetIntHeader(String name, int value)
     Sets a response header with the given name and integer value.
public  voidsetStatus(int sc)
     Sets the status code for this response.
public  voidsetStatus(int sc, String sm)
    

Field Detail
SC_ACCEPTED
final public static int SC_ACCEPTED(Code)
Status code (202) indicating that a request was accepted for processing, but was not completed.



SC_BAD_GATEWAY
final public static int SC_BAD_GATEWAY(Code)
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_BAD_REQUEST
final public static int SC_BAD_REQUEST(Code)
Status code (400) indicating the request sent by the client was syntactically incorrect.



SC_CONFLICT
final public static int SC_CONFLICT(Code)
Status code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.



SC_CONTINUE
final public static int SC_CONTINUE(Code)
Status code (100) indicating the client can continue.



SC_CREATED
final public static int SC_CREATED(Code)
Status code (201) indicating the request succeeded and created a new resource on the server.



SC_EXPECTATION_FAILED
final public static int SC_EXPECTATION_FAILED(Code)
Status code (417) indicating that the server could not meet the expectation given in the Expect request header.



SC_FORBIDDEN
final public static int SC_FORBIDDEN(Code)
Status code (403) indicating the server understood the request but refused to fulfill it.



SC_FOUND
final public static int SC_FOUND(Code)
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.



SC_GATEWAY_TIMEOUT
final public static int SC_GATEWAY_TIMEOUT(Code)
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_GONE
final public static int SC_GONE(Code)
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_HTTP_VERSION_NOT_SUPPORTED
final public static int SC_HTTP_VERSION_NOT_SUPPORTED(Code)
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.



SC_INTERNAL_SERVER_ERROR
final public static int SC_INTERNAL_SERVER_ERROR(Code)
Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.



SC_LENGTH_REQUIRED
final public static int SC_LENGTH_REQUIRED(Code)
Status code (411) indicating that the request cannot be handled without a defined Content-Length.



SC_METHOD_NOT_ALLOWED
final public static int SC_METHOD_NOT_ALLOWED(Code)
Status code (405) indicating that the method specified in the Request-Line is not allowed for the resource identified by the Request-URI.



SC_MOVED_PERMANENTLY
final public static int SC_MOVED_PERMANENTLY(Code)
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
final public static int SC_MOVED_TEMPORARILY(Code)
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.



SC_MULTIPLE_CHOICES
final public static int SC_MULTIPLE_CHOICES(Code)
Status code (300) indicating that the requested resource corresponds to any one of a set of representations, each with its own specific location.



SC_NON_AUTHORITATIVE_INFORMATION
final public static int SC_NON_AUTHORITATIVE_INFORMATION(Code)
Status code (203) indicating that the meta information presented by the client did not originate from the server.



SC_NOT_ACCEPTABLE
final public static int SC_NOT_ACCEPTABLE(Code)
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.



SC_NOT_FOUND
final public static int SC_NOT_FOUND(Code)
Status code (404) indicating that the requested resource is not available.



SC_NOT_IMPLEMENTED
final public static int SC_NOT_IMPLEMENTED(Code)
Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.



SC_NOT_MODIFIED
final public static int SC_NOT_MODIFIED(Code)
Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.



SC_NO_CONTENT
final public static int SC_NO_CONTENT(Code)
Status code (204) indicating that the request succeeded but that there was no new information to return.



SC_OK
final public static int SC_OK(Code)
Status code (200) indicating the request succeeded normally.



SC_PARTIAL_CONTENT
final public static int SC_PARTIAL_CONTENT(Code)
Status code (206) indicating that the server has fulfilled the partial GET request for the resource.



SC_PAYMENT_REQUIRED
final public static int SC_PAYMENT_REQUIRED(Code)
Status code (402) reserved for future use.



SC_PRECONDITION_FAILED
final public static int SC_PRECONDITION_FAILED(Code)
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_PROXY_AUTHENTICATION_REQUIRED
final public static int SC_PROXY_AUTHENTICATION_REQUIRED(Code)
Status code (407) indicating that the client MUST first authenticate itself with the proxy.



SC_REQUESTED_RANGE_NOT_SATISFIABLE
final public static int SC_REQUESTED_RANGE_NOT_SATISFIABLE(Code)
Status code (416) indicating that the server cannot serve the requested byte range.



SC_REQUEST_ENTITY_TOO_LARGE
final public static int SC_REQUEST_ENTITY_TOO_LARGE(Code)
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_TIMEOUT
final public static int SC_REQUEST_TIMEOUT(Code)
Status code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.



SC_REQUEST_URI_TOO_LONG
final public static int SC_REQUEST_URI_TOO_LONG(Code)
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_RESET_CONTENT
final public static int SC_RESET_CONTENT(Code)
Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.



SC_SEE_OTHER
final public static int SC_SEE_OTHER(Code)
Status code (303) indicating that the response to the request can be found under a different URI.



SC_SERVICE_UNAVAILABLE
final public static int SC_SERVICE_UNAVAILABLE(Code)
Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.



SC_SWITCHING_PROTOCOLS
final public static int SC_SWITCHING_PROTOCOLS(Code)
Status code (101) indicating the server is switching protocols according to Upgrade header.



SC_TEMPORARY_REDIRECT
final public static int SC_TEMPORARY_REDIRECT(Code)
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_UNAUTHORIZED
final public static int SC_UNAUTHORIZED(Code)
Status code (401) indicating that the request requires HTTP authentication.



SC_UNSUPPORTED_MEDIA_TYPE
final public static int SC_UNSUPPORTED_MEDIA_TYPE(Code)
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_USE_PROXY
final public static int SC_USE_PROXY(Code)
Status code (305) indicating that the requested resource MUST be accessed through the proxy given by the Location field.





Method Detail
addCookie
public void addCookie(Cookie cookie)(Code)
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



addDateHeader
public void addDateHeader(String name, long date)(Code)
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
Parameters:
  date - the additional date value
See Also:   HttpServletResponse.setDateHeader



addHeader
public void addHeader(String name, String value)(Code)
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
Parameters:
  value - the additional header value If it containsoctet string, it should be encodedaccording to RFC 2047(http://www.ietf.org/rfc/rfc2047.txt)
See Also:   HttpServletResponse.setHeader



addIntHeader
public void addIntHeader(String name, int value)(Code)
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
Parameters:
  value - the assigned integer value
See Also:   HttpServletResponse.setIntHeader



containsHeader
public boolean containsHeader(String name)(Code)
Returns a boolean indicating whether the named response header has already been set.
Parameters:
  name - the header name true if the named response header has already been set; false otherwise



encodeRedirectURL
public String encodeRedirectURL(String url)(Code)
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 separated from the encodeURL 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. the encoded URL if encoding is needed;the unchanged URL otherwise.
See Also:   HttpServletResponse.sendRedirect
See Also:   HttpServletResponse.encodeUrl




encodeRedirectUrl
public String encodeRedirectUrl(String url)(Code)

Parameters:
  url - the url to be encoded. the encoded URL if encoding is needed; the unchanged URL otherwise.



encodeURL
public String encodeURL(String url)(Code)
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. the encoded URL if encoding is needed;the unchanged URL otherwise.




encodeUrl
public String encodeUrl(String url)(Code)

Parameters:
  url - the url to be encoded. the encoded URL if encoding is needed; the unchanged URL otherwise.



sendError
public void sendError(int sc, String msg) throws IOException(Code)
Sends an error response to the client using the specified status. 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
Parameters:
  msg - the descriptive message
exception:
  IOException - If an input or output exception occurs
exception:
  IllegalStateException - If the response was committed




sendError
public void sendError(int sc) throws IOException(Code)
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
exception:
  IOException - If an input or output exception occurs
exception:
  IllegalStateException - If the response was committedbefore this method call




sendRedirect
public void sendRedirect(String location) throws IOException(Code)
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
exception:
  IOException - If an input or output exception occurs
exception:
  IllegalStateException - If the response was committed orif a partial URL is given and cannot be converted into a valid URL




setDateHeader
public void setDateHeader(String name, long date)(Code)
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 set
Parameters:
  date - the assigned date value
See Also:   HttpServletResponse.containsHeader
See Also:   HttpServletResponse.addDateHeader



setHeader
public void setHeader(String name, String value)(Code)
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 header
Parameters:
  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:   HttpServletResponse.containsHeader
See Also:   HttpServletResponse.addHeader



setIntHeader
public void setIntHeader(String name, int value)(Code)
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 header
Parameters:
  value - the assigned integer value
See Also:   HttpServletResponse.containsHeader
See Also:   HttpServletResponse.addIntHeader



setStatus
public void setStatus(int sc)(Code)
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, 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:   HttpServletResponse.sendError




setStatus
public void setStatus(int sc, String sm)(Code)

Parameters:
  sc - the status code
Parameters:
  sm - the status message



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