Main features of JSP
Web applications developed by JSP technology are based on Java. It has the cross-platform characteristics of the Java language, as well as business code separation, component reuse, and basic Java Servlet functions and pre-compilation features.
1. Cross-platform
Since JSP is based on Java language, it can use Java API, So it is also cross-platform and can be applied in different systems, such as Windows, Linux, Mac and Solaris. This also broadens the range of web servers that JSP can use. In addition, databases applied to different operating systems can also serve JSP. JSP uses JDBC technology to operate the database, thus avoiding code modification problems when changing databases due to code migration.
It is precisely because of the cross-platform characteristics that projects developed using JSP technology can be applied to any different platforms without modification. This also fulfills the "write once, run anywhere" characteristic of the Java language. .
2. Business code separation
Projects developed using JSP technology usually use HTML language to design and format the content of static pages, while using JSP tags and Java Code snippets to implement the dynamic part. Program developers can put all the business processing code into JavaBeans, or hand over the business processing code to other business control layers such as Servlet and Struts to separate the business code from the view layer. In this way, the JSP page is only responsible for displaying data. When the business code needs to be modified, the code of the JSP page will not be affected.
3. Component reuse
You can use JavaBean to write business components in JSP, that is, use a JavaBean class to encapsulate business processing code or as a data storage model, in JSP This JavaBean can be reused throughout the page or even the entire project. JavaBeans can also be applied to other Java applications, including desktop applications.
4. Inherit Java Servlet functions
Servlet was the main Java Web processing technology before the emergence of JSP. It accepts user requests, writes all Java and HTML code in the Servlet class, and then returns the resulting page to the browser through the output stream. The disadvantage is that writing HTML code in a class is very inconvenient and difficult to read. After using JSP technology, developing Web applications has become relatively simple and fast, and JSP must eventually be compiled into a Servlet to handle user requests. Therefore, we say that JSP has all the functions and characteristics of a Servlet.
5. Pre-compilation
Pre-compilation means that when the user accesses the JSP page through the browser for the first time, the server will compile the JSP page code and only execute it Compile once. The compiled code will be saved, and the compiled code will be executed directly the next time the user visits. This not only saves the server's CPU resources, but also greatly improves the client's access speed.
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