asp jsp php difference

Currently, the three most commonly used dynamic web page languages ​​​​are ASP (Active Server Pages), JSP (JavaServer Pages), and PHP (Hypertext Preprocessor).

1. Introduction

ASP's full name is Active Server Pages, which is a WEB server-side development environment that can be used to generate and execute dynamic, interactive, high-performance WEB service application. ASP uses the scripting language VBScript (Java script) as its own development language.

PHP is a cross-platform server-side embedded scripting language. It borrows a lot of syntax from C, Java and Perl languages, and couples PHP's own features to enable WEB developers to quickly write dynamically generated pages. It supports most current databases. Another point is that PHP is completely free. You don’t need to spend money. You can download it freely from the PHP official website. And you have unrestricted access to the source code, and you can even add the features you need.

JSP is a new generation of website development language launched by Sun Company. Sun Company uses its extraordinary achievements in Java to separate Java from Java applications and Java Applets, and has new achievements, which is JSP. Java Server Page. JSP can complete powerful site programs with the support of Serverlet and JavaBean.

All three provide the ability to mix certain program code in HTML code and have the language engine interpret and execute the program code. However, the JSP code is compiled into a Servlet and interpreted and executed by the Java virtual machine. This compilation operation only occurs on the first request for the JSP page. In ASP, PHP, and JSP environments, HTML code is mainly responsible for describing the display style of information, while program code is used to describe processing logic.

2. ASP

1. Use VBScript, JScript and other simple and easy-to-understand scripting languages, combined with HTML code, to quickly complete the website application.

2. No need to compile, easy to write, and can be executed directly on the server side.

3. Use an ordinary text editor, such as Windows Notepad, to edit and design.

4. Browser Independence, the client can browse the web content designed by Active Server Pages as long as it uses a browser that can execute HTML code. The script languages ​​(VBScript, Jscript) used by Active ServerPages are executed on the WEB server, and the client's browser does not need to be able to execute these script languages.

3. PHP

Database connection

PHP can be compiled into functions that connect to many databases. PHP and MySQL are an excellent combination right now. You can also write your own peripheral functions to access the database indirectly. In this way, when you change the database you use, you can easily modify the coding to adapt to such changes.

PHPLIB is the most commonly used series of base libraries that can provide general transaction needs. However, the database interface support provided by PHP is not unified with each other. For example, the interfaces to Oracle, MySQL, and Sybase are different from each other. This is also a weakness of PHP.

4. JSP

1. Separate content generation and display

Use JSP technology for Web page development Personnel can use HTML or XML markup to design and format the final page. Use JSP tags or scripts to generate dynamic content on the page.

On the server side, the JSP engine interprets the JSP tag, generates the requested content (for example, by accessing JavaBeans group components, using JDBC technology to access the database), and displays the results as an HTML (or XML) page The form is sent back to the browser. This helps authors protect their code while ensuring full usability with any HTML-based web browser.

2. Emphasis on reusable group components

Most JSP pages rely on reusable and cross-platform components (such as JavaBeans or Enterprise JavaBeans). Perform more complex processing required by the application. Developers can share and exchange components that perform common operations or make these components available to a larger number of users or groups of users. The component-based approach accelerates the overall development process and allows various groups of organizations to leverage their existing skills and development efforts to optimize results.

3. Use logos to simplify page development

Not all Web page developers are programmers who are familiar with scripting languages. JavaServer Page technology encapsulates many of the features needed for dynamic content generation in easy-to-use, JSP-related XML tags. Standard JSP tags can access and instantiate JavaBeans components, set or retrieve group component properties, download applets, and perform functions that are more difficult to code and time-consuming in other ways.

JSP technology can be expanded by developing customized logo libraries. In the future, third-party developers and others can build their own libraries of tags for commonly used functions. This allows Web page developers to work with familiar tools and components like markup that perform specific functions.

5. Application scope

ASP is a dynamic web page language developed by Microsoft. It also inherits the tradition of Microsoft products. It can only be executed on Microsoft's server products, IIS (Internet Information Server) (windows NT) and PWS (Personal Web Server) (windows 98). )superior. There are also ChiliSoft components under Unix to support ASP, but the functions of ASP itself are limited and must be expanded through the combination of ASP + COM. It is very difficult to implement COM under Unix.

PHP3 can be executed normally on Windows, Unix, and Linux web servers. It also supports general web servers such as IIS and Apache. When users change platforms, there is no need to change the PHP3 code and it can be used right away.

JSP is similar to PHP3 and can be executed on almost all platforms. Such as Win NT, Linux, Unix. Under NT, IIS can support JSP through an external server, such as JRUN or ServletExec.

6. Prospect Analysis

Currently PHP is the most widely used in China. With the upgrade of PHP version, PHP can be used in large sites or small and medium-sized sites. Both can perform well, but asp has slowly withdrawn from the market due to its own limitations.

In short, ASP, PHP, and JSP all have a considerable number of supporters, and it can be seen that each of the three has its own strengths. Friends who are learning or using dynamic pages can choose a language that suits them based on the characteristics of the three.

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