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Notice how the doGet( ) method automatically prompts the user for the lengths of the sides if they are not part of the request (as they won t be when the servlet is first executed) If either side1 or side2 is null, it means that one or both of the parameters is missing This causes the side1, side2, and hypot (the result) to be set to the null string Otherwise, the hypotenuse is computed Then, the HTML is sent that includes the prompting and result text boxes If side1, side2, and hypot are null strings, then the text boxes are empty, and the user will enter the lengths Otherwise, the lengths and the result are displayed Notice one other thing: the text box that displays the result is read-only This means that the user cannot enter a string into it

The Drop Palette will display: Create Standard Submenu (Default Action): Creates a new Standard Menu using the Image as Background; links to Button

In addition to doGet( ), HttpServlet provides handlers for several other HTTP requests For example, you can use doPost( ) to handle a POST request and doPut( ) to handle a PUT request When creating an HttpServlet, override the handlers required by your application

The Drop Palette will display: Create Slideshow (Default Action): Creates new Slideshow linked to Button

Classes javaxservlethttpCookie Methods String getName( ) String getValue( ) void setMaxAge(int period) Cookie[ ] getCookies( ) void addCookie(Cookie ck)

The following section lists the Drop Palette options that appear when you drag project elements to a Button in a layered menu

Cookies are an important part of many web applications For this reasons, servlets provide substantial support for them For example, cookies can be created by a servlet and they can be read by a servlet Cookies are instances of the Cookie class This recipe shows how to create a cookie and then obtain its value

The Drop Palette will display:

To use cookies with a servlet involves these steps: 1 Create a Cookie object that contains the name and value that you want to give to the cookie All names and values are represented as strings 2 To save a cookie, call addCookie( ) on the HttpServletReponse object 3 To retrieve a cookie, first obtain an array of the cookies associated with a request by calling getCookies( ) on the HttpServletRequest object Then, search for the cookie whose name matches the one that you are looking for Use getName( ) to obtain the name of each cookie Finally, obtain the value of the cookie by calling getValue( )

The Drop Palette will display: Connect to Slideshow (Default Action): Links Slideshow to Button Create Index: Links Button to new Menu created using Slideshow Asset

The Drop Palette will display: Connect to Menu (Default Action): Links Button to Menu; no other action

In a servlet, a cookie is encapsulated by the Cookie class It defines one constructor, which is shown here: Cookie(String name, String value) Here, name specifies the name of the cookie and value specifies its value

The Drop Palette will display: Connect to Script (Default Action): Links Script to Button; no other action

6:

Summary

By default, an instance of Cookie is removed from the browser when the browser is terminated However, you can persist a cookie by setting its maximum age by calling setMaxAge( ): void setMaxAge(int period) The cookie will persist until period seconds have transpired For example, if you want a cookie to remain for 24 hours, pass 86,400 to setMaxAge( ) To add a cookie, call addCookie( ) on the HttpServletResponse object It is shown here: void addCookie(Cookie ck) The cookie to add is passed via ck To obtain an array of the cookies associated with a request, call getCookies( ) It is shown here: Cookie[ ] getCookies( ) If there are no cookies linked to the request, null is returned Given a Cookie, you can obtain its name by calling getName( ) Its value is obtained by calling getValue( ) These methods are shown here: String getName( ) String getValue( ) Therefore, using the array returned by getCookies( ), you can search for a specific cookie by name by calling getName( ) on each cookie until a cookie with the matching name is found Using the cookie, you can obtain its value by calling getValue( )