2. session object ID: When a customer's first visit to a server on the JSP pages, JSP engines produce a session object, and assigned a String type of ID number, JSP engine at the same time, the ID number sent to the client, stored in Cookie, this session objects, and customers on the establishment of a one-to-one relationship. When a customer to connect to the server of the other pages, customers no longer allocated to the new session object, until, close your browser, the client-server object to cancel the session, and the conversation, and customer relationship disappeared. When a customer re-open the browser to connect to the server, the server for the customer to create a new session object.
服装管理系统数据流图+结构图+用况图+活动图 四. aplication target
1. What is the application:
Servers have launched after the application object, when a customer to visit the site between the various pages here, this application objects are the same, until the server is down. But with the session difference is that all customers of the application objects are the same, that is, all customers share this built-in application objects.
2. application objects commonly used methods:
(1) public void setAttribute (String key, Object obj): Object specified parameters will be the object obj added to the application object, and to add the subject of the designation of a keyword index.
(2) public Object getAttribute (String key): access to application objects containing keywords for.
五. out targets
out as a target output flow, used to client output data. out targets for the output data.
优. Cookie
1. What is Cookie:
Cookie is stored in Web server on the user's hard drive section of the text. Cookie allow a Web site on the user's computer to store information on and then get back to it.
For example, a Web site may be generated for each visitor a unique ID, and then to Cookie in the form of documents stored in each user's machine.
If you use IE browser to visit Web, you will see all stored on your hard drive on the Cookie. They are most often stored in places: c: \ windows \ cookies (in Window2000 is in the C: \ Documents and Settings \ your user name \ Cookies)
Cookie is "keyword key = value value" to preserve the format of the record.
2. Targets the creation of a Cookie, Cookie object called the constructor can create a Cookie. Cookie object constructor has two string parameters: Cookie Cookie name and value.
Cookie c = new Cookie ( "username", "john");
3. If the JSP in the package good Cookie object to send to the client, the use of the response addCookie () method.
Format: response.addCookie (c)
4. Save to read the client's Cookie, the use of the object request getCookies () method will be implemented in all client came to an array of Cookie objects in the form of order, to meet the need to remove the Cookie object, it is necessary to compare an array cycle Each target keywords.
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