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Functions and characteristics of ASP technology

Source: Shangpin China | Type: website encyclopedia | Time: July 11, 2019
What is ASP technology?
ASP (Active Server Page) is an application launched by Microsoft to replace CGI (Common Gateway Interface) program. Many Windows based Web sites on the Internet have begun to apply ASP to replace CGI.
The Role of ASP Technology
ASP is a script running environment on the server side. Through this environment, users can create and run dynamic interactive Web server applications, such as interactive dynamic web pages, including collecting and processing information using HTML forms, uploading and downloading, etc. Generally, most of the web pages that users see through their browsers are static. At present, many sites on the Internet still provide "static" homepage content. The so-called "static" means that the homepage content of the site is "fixed". For a "static website" site, if you want to update the content of the home page, you must manually update the HTML file data. With the development of Web applications, users want to see the homepage dynamically generated according to requirements, such as responding to users' requirements for querying databases, generating reports and other functions. When the input data of the form is filled in the browser to provide HTTP requests, the application can be executed in the site server, not just an HTML file. The site server receives the application to be executed, analyzes the input data of the form, and transmits the execution results to the browser in HTML format. The traditional methods of generating dynamic home pages based on user requests include CGI, ISAPI, etc. When there are many requests, the program occupies the system resources, resulting in low efficiency; ISAPI improves this shortcoming by using dll (dynamic link library) technology to replace process with thread, which improves performance and speed. However, thread synchronization should be considered, and the development steps are particularly cumbersome. There is another problem with these two technologies and the widely used development technology Java, that is, development difficulties. Program development and HTML writing are two completely different processes, requiring special programmers to develop. While simpler development technologies, such as javascript and IDC, have limited functions and are not used. The ActiveX technology used by ASP technology is based on an open design environment. Users can define and make components to join it, making their dynamic web pages almost have unlimited expansion capabilities, which is far inferior to traditional CGI and other programs. ASP technology is different from the common technologies that implement dynamic home pages on the client side, such as Java applet, ActiveX Control, VBScript, javascript, etc. The commands and script statements in ASP technology are interpreted and executed by the server, and the execution results generate dynamically generated Web pages and send them to the browser; The script commands of the client side technology are interpreted and executed by the browser. Because ASP technology is interpreted and executed on the server side, developers can not consider whether the browser supports ASP technology; At the same time, because it is executed on the server side, developers do not have to worry about other people downloading programs to steal programming logic. ASP technology is implemented through ASP files with the suffix. asp. An. asp file is equivalent to an executable file, so it must be placed in a directory with executable permissions on the Web server. After the user enters the address of the. asp file from the browser, the browser sends the URL request to the WebServer. If ASP is installed on the WebServer, it calls ASP. ASP reads the corresponding. asp file, interprets and executes commands, dynamically generates an HTML page and sends it back to WebServer, which then sends the results to the browser. The production of ASP files is similar to HTML, and can be completed in the same process as HTML development integration. ASP technology is used to embed executable scripts into HTML files (change the suffix of HTML files to. asp), which makes the preparation of HTML files and the development of scripts integrated together. Through the built-in objects and server components of ASP technology, very complex tasks can be completed, and users can also develop or use server components developed by others to complete special tasks.
ASP technology has the following advantages over the server extension mode:
1. Use ASP technology to break through some functional limitations of static web pages and realize dynamic web page technology
2. ASP file is contained in the file composed of HTML code, which is easy to modify and test;
3. The ASP on the server will develop an ASP program on the server port and transmit the results to the client browser in HTML format, so the pages generated by ASP are suitable for various browsers;
4. ASP technology provides some built-in objects, which can make the server-side script more powerful. For example, you can obtain the information submitted by users through HTML forms from the web browser, process the information in the script, and then send the information to the web browser;
5. ASP can use server-side ActiveX components to perform various tasks, such as accessing databases, discovering emails or accessing file systems.
6. Because the server sends the results of ASP program execution back to the client browser in HTML format, the user will not see the original program code written by ASP, and can place the ASP program code to be stolen.
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