Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

javax.servlet.http.Cookie
+Cookie(name: String, value: String)
+getName(): String
+getValue(): String
+setValue(newValue: String): void
+getMaxAge(): int
+setMaxAge(expiration: int): void
+getSecure(): boolean
+setSecure(flag: boolean): void
+getComment(): String
+setComment(purpose: String): void
Creates a cookie with the specified name-value pair.
Returns the name of the cookie.
Returns the value of the cookie.
Assigns a new value to a cookie after the cookie is created.
Returns the maximum age of the cookie, specified in seconds.
Specifies the maximum age of the cookie. By default, this value is –1, which implies
that the cookie persists until the browser exits. If you set this value to 0, the cookie
is deleted.
Returns true if the browser is sending cookies only over a secure protocol.
Indicates to the browser whether the cookie should only be sent using a secure
protocol, such as HTTPS or SSL.
Returns the comment describing the purpose of this cookie, or null if the cookie has
no comment.
Sets the comment for this cookie.
Figure 42.23
Cookie stores a name/value pair and other information about the
cookie.
To send a cookie to the browser, use the addCookie method in the
HttpServletResponse class, as shown below:
response.addCookie(cookie);
where response is an instance of HttpServletResponse.
To obtain cookies from a browser, use
request.getCookies();
where request is an instance of HttpServletRequest.
To demonstrate the use of cookies, let us create an example that
accomplishes the same task as Listing 42.9, Registration.java. Instead
of using hidden values for session tracking, it uses cookies.
Create the servlet named RegistrationWithHttpCookie in Listing 42.10.
Create an HTML file named RegistrationWithCookie.html that is identical
to Registration.html except that the action is replaced by
RegistrationWithCookieH..
Listing 42.10 RegistrationWithCookie.java
package chapter42;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
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