The difference and connection between ASP and JSP

js| difference |js today on the forum looked at, there is a netizen BlueSkyAsk the question to say "ASP and JSP which is good, they have what difference?" "Forum posts please click here to see: http://www.webjx.com/bbs/topic.php?tid=4766

Dynamic Web page Technology development ASP and JSP comparison please see here: http://www.webjx.com/htmldata/2005-05-29/1117327873.html

There seems to be no thread-safety problem with the ASP, and the JSP is thread-safe. This is not to say that the ASP is good, on the contrary, ASP is not as good as JSP.

For ASP: Every request to explain the implementation of the server-side code, the implementation of the session and application in addition to the session, the other is gone, so that the ASP can not achieve static variables, do not know if there is no way to achieve, please expert advice.

In JSP, the servlet (JSP will also become a servlet) is multi-threaded, after the execution of not only session and application still, and the Servlet instance is still in memory, the request can be used directly later, it is this increase in efficiency.

I always feel that the servlet model is more advanced than ASP, and the Java language makes IT professional! This is really an ASP far can not compare.

A few differences between JSP and ASP

Session Management

In order to track the user's operation status, ASP applies the Session object. JSP uses an object called HttpSession to achieve the same function. The session information is saved on the server side, and the session ID is stored in the client's cookie. If the client prohibits the Cookie,session ID, it must be brought behind the URL. Session typically sets a 30-minute expiration time on the server, which automatically expires when the customer stops the activity. The information saved and retrieved in the session cannot be the base data type (Primitivedatatypes) such as (int, double), and must be the corresponding object (object) of Java (integer,double).

Httpsessionsession=request.getsession ()//Get a Session object or create a
Session.getid ()//Get SessionID number
Integerid= (integer) session.getvalue ("id")//retrieves the value of the session and converts it to an integral type Session.putvalue ("Itemvalue", itemname); Itemvalue must not be must simple type

Application Management

Sometimes the server needs to manage parameters for the entire application so that each customer gets the same parameter value. As with the session, ASP uses the Application object and the JSP uses the ServletContext object, the same way as the session.

Getservletcontext (). setattribute ("Item", itemvalue);//set an application variable
Integeri= (Integer) Getservletcontext (). getattribute ("ItemName");/Get//item

Serversideincludes

ASP and JSP have the same place on the server side references. ASP and JSP can support this functionality on the server (Iis,apache) to implement server-side contains virtual files. But the JSP is to include the result of the dynamic page, not the code itself that contains the file. When you include files on another server, it is a very effective function to not include any code and objects.

asp:<!--#includefile = "subfile.asp"-->
jsp:<% @includefile = "subfile.jsp"-->