At present, there are several popular solutions for developing Web dynamic information web pages: ASP, PHP, JSP, ISAPI, CGI, etc. These development technologies have their own advantages and disadvantages. Compared with PHP, ASP, ISAPI, and CGI, JSP has quite a few advantages.
At present, there are several popular solutions for developing Web dynamic information web pages: ASP, PHP, JSP, ISAPI, CGI, etc. These development technologies have their own advantages and disadvantages. Compared with PHP, ASP, ISAPI, and CGI, JSP has quite a few advantages. Since the current CGI and ISAPI technologies are far less widely used than the first three, they are not discussed in detail here, and a theoretical comparative analysis of ASP, PHP and JSP is done.
1 ASP, PHP and JSP concepts
ASP (Active Server Pages) is a component of Microsoft Corporation IIS. It provides a server-side Vbscript/JScript script runtime environment. When the script runs on the server side, the web server completes all the work involved in returning the browser's HTML page and returns the corresponding HTML text. ASP directly embeds server-side scripts in HTML files, making the development of dynamic interactive pages a whole, making development and maintenance work simple and fast. At the same time, because it is a server-side script, it cannot be seen by ordinary users, thus effectively ensuring the security of the system and the intellectual property of developers.
PHP (Hypertext Preprocessor) is a cross-platform server-side embedded scripting language introduced by Rasmus Lerdorf. It borrows the syntax of C, Java and Perl language and combines the features of PHP to enable Web developers to quickly compile dynamics. Web page. PHP is completely free, you can download it freely, and you can even get the source code without restrictions, so you can add your own features.
JSP (Java Server Pages) is a Java-based technology and a technology for developing Web daemons. It is a new technology launched by Sun Microsystems in June 1999. It is a Web development technology based on JavaServlet and the entire Java system. The technology is an advanced, secure, open and cross-platform dynamic web technology standard advocated by Sun Microsystems, a company that is involved with companies. The significance of this technology standard is to find a developer and application developer. A development approach that balances portability and ease of use.
2 Performance and characteristics
ASP can be interpreted without compiling and linking. It is integrated into HTML and can be developed using a regular text editor. The ASP program is browser-independent, and the client can browse using a regular browser that can execute HTML code. ASP's scripting language (Vbscript, Jscript) is executed on the server, and the client's browser does not need to execute these scripting languages. ASP can also be extended by the Ac-tiveX server component (ActiveX Server Component). ActiveX Server Component can be implemented in languages ​​such as VB, Java, C++, and COBOL. In addition, ASP technology is compatible with any scripting language. In addition to using Vbscript or Jscript as a scripting language, other scripting languages ​​provided by third parties can also be used through plugins. The ASP source code is not passed to the user's browser and can protect the source. The result of being passed to the client browser is the execution result of the ASP program. But ASP's security is not good, there are more vulnerabilities. On the other hand, although the ASP program is very simple and easy to write, the main scripting language used by ASP is Vbscript, which has limited functions.
PHP is easy to learn, and you can quickly and easily write a powerful Web daemon that runs on Windows, Unix, and Linu platforms. Anyone who uses the GNU treaty can use and change their source code for free. PHP uses embedded scripting code similar to ASP to execute embedded script code to access the backend database and interact with the user. Providing numerous protocol support, such as HTTP, IMAP, POP3, and NNTP, makes PHP perform well across platforms. PHP supports most of the current databases and has many functions that connect to various types of databases. It is a great combination with MYSQL, and you can also write peripheral functions to access the database indirectly. The advantage is that there are many database systems supported, and you can customize the functions of the PHP interpreter yourself, but the database interface support provided by PHP is not uniform. For example, the access interfaces to Oracle, MySQL, Sybase and other databases are different from each other. This is PHP. A disadvantage.
The biggest feature of the JSP program is the separation of the generation and display of web content. Using JSP technology, web page developers can use HTML or 3 differences
3.1 Operating Environment ASP can only run on Microsoft server products. Unix platforms also have plug-ins developed by ChiliSoft to support ASP, but ASP itself has limited functionality and must be extended by a combination of ASP and COM components. COM components under Unix are very difficult to implement. PHP can run on Web servers on Windows and Unix platforms, and can also support general-purpose Web servers such as IIS and Apache, but users need to make major changes when changing platforms. JSP is similar to PHP and runs on almost all platforms. Currently, almost all platforms support Java, and JSP+JavaBeans are accessible on all platforms. Migrating from one platform to another, JSPs and JavaBeans don't even need to be recompiled because Java bytecode is standard and platform-independent.
3.2 Development language and performance comparison ASP uses scripting languages ​​such as Vbscript and Jscript. JSP technology uses Java language as the scripting language. Java is a mature, powerful and easy to expand programming language, which is superior to Basic-based scripting language. For example, Java's executable is better than Vbscript or JScript because they use Java technology and are compiled into Java Servlets. PHP uses HTML code inline scripting language, which mixes C, Java, Perl and its own unique syntax, and mainly comes from C language, such as control flow statement and C is almost exactly the same, the operation between variables Similar to C, function definitions and calls similar to C, etc.
3.3 Operation mode and execution efficiency ASP and PHP interpret the scripting language into HTML language through the server during execution. JSP is first compiled into a Java Servlet engine. Some people have done experiments on performance comparison, and do loop performance testing and access Oracle database testing for these three languages. JSP is the fastest in both loop performance testing and database testing.
3.4 Functions Support JSP programs use the Java language as a scripting language, and are finally compiled into Java class files. This means that any JK library available can be used in a JSP program. At present, Java has more than 20,000 class libraries. There are many classes in the class library. There are many methods in the class. These libraries can be used in JSP programs, and Java libraries are still rich. ASP technology is controlled by Microsoft, and it is difficult for third-party manufacturers to intervene. In the ASP program, it is not possible to directly call the C/C++ function library. Generally, it needs to be encapsulated into the form of ActiveX component, so that it can be applied in the ASP program, and the development difficulty of the ActiveX component is relatively large. PHP
This article originates from: www.news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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