Cookie class

1
Cookie class

• In package javax.servlet.http
• Encapsulates a cookie
• A cookies value can uniquely identify a client ?
  good for maintaining state (session management)

2
Cookie class

• 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
• ? be aware, and use them sparingly

3
Cookie class

• Constructor
• Cookie( String name, String value )
• Cookie class has accessors (get methods) and
  mutators (set methods) for all the instance
  variables name, value, maxAge, comment, domain,
  path, secure, version

4
Cookie class

• String getName( )
• String getValue( )
• void setName( String name )
• void setValue( String value )

5
Cookie class

• void setMaxAge( int expiry )
• / sets the maximum age of the cookie in seconds
  /
• int getMaxAge( )
• / Returns the maximum age of the cookie, in
  seconds. -1 indicating the cookie will persist
  until browser shutdown (default or about to
  expire) /

6
Cookie class

• void setPath( String path )
• / sets path so that JSPs and servlets from that
  directory and below can access the cookie /
  indicates entire application /
• String getPath( )

7
Cookie class

• void setDomain( String domainPattern )
• / enables to make cookie available to other
  hosts if argument is .ct366.com, then cookie
  is available to www.xyz.ct366.com /
• String getDomain( )

8
Cookie class

• void setSecure( boolean secure )
• / true ? cookie can only be sent over a secure
  connection default false /
• boolean isSecure( )

9
Setting a Cookie

• Cookie cookie new Cookie( name, value )
• // response implicit HttpServletResponse object
• // HttpServletResponse has an addCookie method
• void addCookie( Cookie cookie )
• response.addCookie( cookie )
• / Typically, cookies are set at the beginning of
  a JSP page, as they are sent out as part of the
  HTTP headers. addCookie can be called several
  times /

10
Forms - Java Server Pages

• request is an implicit object that we use for
  retrieving form information
• request is an instance of class
  HttpServletRequest
• Information can be found at
• http//java.sun.com/webservices/docs/1.5/api/jav
  ax/servlet/http/HttpServletRequest.html

11
HttpServletRequest methods

• getCookies()           Returns an array
  containing all of the Cookie objects the client
  sent with this request.
• // Returns an array of Cookie objects