Class Cookie
- All Implemented Interfaces:
Serializable
,Cloneable
A cookie has a name, a single value, and optional attributes such as a comment, path and domain qualifiers, a maximum age, and a version number. Some Web browsers have bugs in how they handle the optional attributes, so use them sparingly to improve the interoperability of your servlets.
The servlet sends cookies to the browser by using the HttpServletResponse.addCookie(jakarta.servlet.http.Cookie)
method, which adds fields
to HTTP response headers to send cookies to the browser, one at a time. The browser is expected to support 50 cookies
for each domain, 3000 cookies total, and may limit cookie size to 4 KiB each.
The browser returns cookies to the servlet by adding fields to HTTP request headers. Cookies can be retrieved from a
request by using the HttpServletRequest.getCookies()
method. Several cookies might have the same name but
different path attributes.
Cookies affect the caching of the Web pages that use them. HTTP 1.0 does not cache pages that use cookies created with this class. This class does not support the cache control defined with HTTP 1.1.
This class supports the RFC 6265 specification.
- See Also:
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionclone()
Overrides the standardjava.lang.Object.clone
method to return a copy of this cookie.boolean
getAttribute
(String name) Obtain the value for a given attribute.Obtain the Map of attributes and values (excluding version) for this cookie.Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265Returns the domain name set for this cookie.int
Returns the maximum age of the cookie, specified in seconds, By default,-1
indicating the cookie will persist until browser shutdown.getName()
Returns the name of the cookie.getPath()
Returns the path on the server to which the browser returns this cookie.boolean
Returnstrue
if the browser is sending cookies only over a secure protocol, orfalse
if the browser can send cookies using any protocol.getValue()
Returns the value of the cookie.int
Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265int
hashCode()
boolean
Gets the flag that controls if this cookie will be hidden from scripts on the client side.void
setAttribute
(String name, String value) Sets the value for the given cookie attribute.void
setComment
(String purpose) Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265void
Specifies the domain within which this cookie should be presented.void
setHttpOnly
(boolean httpOnly) Sets the flag that controls if this cookie will be hidden from scripts on the client side.void
setMaxAge
(int expiry) Sets the maximum age of the cookie in seconds.void
Specifies a path for the cookie to which the client should return the cookie.void
setSecure
(boolean flag) Indicates to the browser whether the cookie should only be sent using a secure protocol, such as HTTPS or SSL.void
Assigns a new value to a cookie after the cookie is created.void
setVersion
(int v) Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265
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Constructor Details
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Cookie
Constructs a cookie with a specified name and value.The cookie's name cannot be changed after creation.
The value can be anything the server chooses to send. Its value is probably of interest only to the server. The cookie's value can be changed after creation with the
setValue
method.- Parameters:
name
- aString
specifying the name of the cookievalue
- aString
specifying the value of the cookie- Throws:
IllegalArgumentException
- if the cookie name contains illegal characters- See Also:
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Method Details
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setComment
Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265If called, this method has no effect.- Parameters:
purpose
- ignored- See Also:
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getComment
Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265With the adoption of support for RFC 6265, this method should no longer be used.- Returns:
- always
null
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setDomain
Specifies the domain within which this cookie should be presented.By default, cookies are only returned to the server that sent them.
- Parameters:
pattern
- aString
containing the domain name within which this cookie is visible- See Also:
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getDomain
Returns the domain name set for this cookie.- Returns:
- a
String
containing the domain name - See Also:
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setMaxAge
public void setMaxAge(int expiry) Sets the maximum age of the cookie in seconds.A positive value indicates that the cookie will expire after that many seconds have passed. Note that the value is the maximum age when the cookie will expire, not the cookie's current age.
A negative value means that the cookie is not stored persistently and will be deleted when the Web browser exits. A zero value causes the cookie to be deleted.
- Parameters:
expiry
- an integer specifying the maximum age of the cookie in seconds; if negative, means the cookie is not stored; if zero, deletes the cookie- See Also:
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getMaxAge
public int getMaxAge()Returns the maximum age of the cookie, specified in seconds, By default,-1
indicating the cookie will persist until browser shutdown.- Returns:
- an integer specifying the maximum age of the cookie in seconds; if negative, means the cookie persists until browser shutdown
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setPath
Specifies a path for the cookie to which the client should return the cookie.The cookie is visible to all the pages in the directory you specify, and all the pages in that directory's subdirectories. A cookie's path must include the servlet that set the cookie, for example, /catalog, which makes the cookie visible to all directories on the server under /catalog.
- Parameters:
uri
- aString
specifying a path- See Also:
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getPath
Returns the path on the server to which the browser returns this cookie. The cookie is visible to all subpaths on the server.- Returns:
- a
String
specifying a path that contains a servlet name, for example, /catalog - See Also:
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setSecure
public void setSecure(boolean flag) Indicates to the browser whether the cookie should only be sent using a secure protocol, such as HTTPS or SSL.The default value is
false
.- Parameters:
flag
- iftrue
, sends the cookie from the browser to the server only when using a secure protocol; iffalse
, sent on any protocol- See Also:
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getSecure
public boolean getSecure()Returnstrue
if the browser is sending cookies only over a secure protocol, orfalse
if the browser can send cookies using any protocol.- Returns:
true
if the browser uses a secure protocol; otherwise,false
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getName
Returns the name of the cookie. The name cannot be changed after creation.- Returns:
- a
String
specifying the cookie's name
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setValue
Assigns a new value to a cookie after the cookie is created. If you use a binary value, you may want to use BASE64 encoding.With Version 0 cookies, values should not contain white space, brackets, parentheses, equals signs, commas, double quotes, slashes, question marks, at signs, colons, and semicolons. Empty values may not behave the same way on all browsers.
- Parameters:
newValue
- aString
specifying the new value- See Also:
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getValue
Returns the value of the cookie.- Returns:
- a
String
containing the cookie's present value - See Also:
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getVersion
Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265With the adoption of support for RFC 6265, this method should no longer be used.- Returns:
- Always zero
- See Also:
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setVersion
Deprecated, for removal: This API element is subject to removal in a future version.This is no longer required with RFC 6265If called, this method has no effect.- Parameters:
v
- Ignored- See Also:
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clone
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setHttpOnly
public void setHttpOnly(boolean httpOnly) Sets the flag that controls if this cookie will be hidden from scripts on the client side.- Parameters:
httpOnly
- The new value of the flag- Since:
- Servlet 3.0
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isHttpOnly
public boolean isHttpOnly()Gets the flag that controls if this cookie will be hidden from scripts on the client side.- Returns:
true
if the cookie is hidden from scripts, elsefalse
- Since:
- Servlet 3.0
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setAttribute
Sets the value for the given cookie attribute. When a value is set via this method, the value returned by the attribute specific getter (if any) must be consistent with the value set via this method.- Parameters:
name
- Name of attribute to setvalue
- Value of attribute- Throws:
IllegalArgumentException
- If the attribute name is null or contains any characters not permitted for use in Cookie names.NumberFormatException
- If the attribute is known to be numerical but the provided value cannot be parsed to a number.- Since:
- Servlet 6.0
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getAttribute
Obtain the value for a given attribute. Values returned from this method must be consistent with the values set and returned by the attribute specific getters and setters in this class.- Parameters:
name
- Name of attribute to return- Returns:
- Value of specified attribute
- Since:
- Servlet 6.0
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getAttributes
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hashCode
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equals
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