Enable cookies in your application in Java

Painting Code 128A in Java Enable cookies in your application

Much like sessions, before you can create a cookie, you first have to set up your application to support cookies This can be done in the applicationcfm file, using the same <CFAPPLICATION> tag that you would use to set up sessions You need the following three tag values to be set: CLIENTMANAGEMENT= Yes CLIENTSTORAGE= Cookie SETCLIENTCOOKIES= Yes After these are set, you can get about the business of generating cookies

give it a name ColdFusion includes a tag specifically for the writing of cookies While you can use dots () in cookie names, be sure to avoid spaces and vague names Here s an example of a well-named and well-formed cookie:

A cookie value can be just about any kind of string, constant, or variable It cannot, however, include complex values like arrays or structures For example, if your site has a newsletter that requires a user s e-mail

address, you could include a check box at sign-up that says Remember my e-mail address If you set the cookie value to #email#, then you could retrieve that value when the user returns to the site The syntax for setting this value would be as follows:

Setting the expiration date lets the computer know when to remove the cookie from the user s machine You can give the expires parameter several possible types of values: A specific date (in mm/dd/yy format) A specific number of days into the future (1, 2, 30, and so on) now, which deletes the cookie never, which writes the cookie and never removes it If you don t want this cookie to expire, the syntax for the cookie would now look as follows:

You can choose to specify three other pieces of information through this tag (check out the CFML reference in Dreamweaver for more detailed information on these parameters): Domain: This parameter sets the Internet Domain for which the cookie s content is valid The domain name must start with a period (), and is a required tag if you use the path parameter The syntax is as follows: domain = mydomaincom Path: This parameter limits the validity of a cookie to a specific path within a domain If you use this parameter, then the domain parameter is also required The syntax is as follows: path= /newsletters Secure: This is a simple yes or no flag for the parameter If yes is selected, then the cookie will only be set if the site is using Secure Socket Layers (SSL) The syntax is as follows: secure= no When the page is processed, the cookie will be set To check to see if your cookie worked locally while you re testing, check out the local cookies directory on your computer, as shown in Figure 7-3

If you want to have users sign up for something on your site a mailing list for example then you re probably going to want to take advantage of ColdFusion s mail tools Before we describe how to do it, though, be warned: You re going to need to have access to an e-mail server (SMTP) to take advantage of this tag, so be sure to check with your Internet service provider and make sure that you have this kind of service After you ve got that squared away, sending mail is a breeze Check out the code snippet in the following example In it, we create a very simple little form that includes first name, last name, and e-mail address, and then with the Steps list, we walk you through sending an e-mail All of this code goes in the same file, called mailcfm Here s the initial FORM code:

<FORM method= post action= mailcfm > First Name:  <INPUT name= first type= text maxlength= 60 ><BR> Last Name:  <INPUT name= last type= text maxlength= 60 ><BR> Email:  <INPUT name= email type= text maxlength= 60 ><BR> <INPUT type= submit value= Send Mail > </FORM>