<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 9<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
.O1
{color:black;
font-size:149%;}
.O2
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
n
A
cookie
is a small bit of text sent to the client that can be read again
later
n
Limitations (for the protection of the client):
n
Not more than 4KB per cookie (more than enough in general)
n
Not more than 20 cookies per site（一个站点的cookie不能超过20个）
n
Not more than 300 cookies total（一个浏览器不超过300个）
n
Cookies are
not
a security threat
n
Cookies
can be
a privacy threat
n
Cookies can be used to customize advertisements
n
Outlook Express allows cookies to be embedded in email
n
A servlet can read your cookies
n
Incompetent companies might keep your credit card info in a cookie
n
Netscape and Firefox let you refuse cookies to sites
other than that to which you
connected
Using Cookies
<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 10<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
.O1
{color:black;
font-size:149%;}
.O2
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
n
import javax.servlet.http.*;
n
Constructor:
Cookie(String name, String value)
n
Assuming
request
is an
HttpServletRequest
and
response
is an
HttpServletResponse
,
n
response
.addCookie(cookie);
n
Cookie[ ] cookies =
request
.getCookies();
n
String name = cookies[i].getName();
n
String value = cookies[i].getValue();
n
There are, of course, many more methods in the
HttpServletRequest
,
HttpServletResponse
, and
Cookie
classes in the
javax.servlet.http
package
<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 11<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
Some more
Cookie
methods
<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 11<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
.O1
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
n
public void setComment(String
purpose
)
n
public String getComment()
n
public void setMaxAge(int
expiry
)
n
public int getMaxAge()
n
Max age in seconds after which cookie will expire
n
If
expiry
is negative, delete when browser exits
n
If
expiry
is zero, delete cookie immediately
n
setSecure(boolean
flag
)
n
public boolean getSecure()
n
Indicates to the browser whether the cookie should only be sent using a secure
protocol, such as HTTPS or SSL
<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 12<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
What cookies are good for
<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 12<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
.O1
{color:black;
font-size:149%;}
.O2
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
n
Advantages:
n
Java’s Session Tracking API (to be discussed) makes cookies dead simple to
use
n
Cookies can easily contain more data than hidden fields
n
Data is stored on the client computer, not on yours
n
This saves space on the server
n
May let you avoid keeping track of multiple(session) data structures
n
Disadvantages:
n
Data is stored on the client computer, not on yours
n
This means the data is neither safe nor secure
n
Should not be used for user data--cookies may be discarded or the user may
contact the server from another computer
n
Users can tell their browser to turn cookies off
<!-- [if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
p\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
v\:textbox {display:none;}
</style>
<![endif]-->幻灯片 12<!-- [if !ppt]-->
.O
{color:black;
font-size:149%;}
a:link
{color:#CB00CB !important;}
a:active
{color:#3300FF !important;}
a:visited
{color:#0098CB !important;}
<!--.sld
{left:0px !important;
width:6.0in !important;
height:4.5in !important;
font-size:103% !important;}
-->
<!-- [endif]-->
n
Cookies are good for keeping session data, not user data
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