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How to compare Java Servlet with Applet, CGI and JSP? I believe many inexperienced people are at a loss about this. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Java Servlet is a server-side Java application independent of platform and protocol, which can generate dynamic Web pages.

Java Servlet is a server-side Java application located inside a Web server. Unlike traditional Java applications launched from the command line, Servlet is loaded by a Web server, which must contain a Java virtual machine that supports Servlet.

Comparison of Java Servlet and Applet:

Similarities:

◆ they are not stand-alone applications and there is no main () method.

◆ they are not called by the user or programmer, but by another application (container).

◆ they all have a life cycle, including the init () and destroy () methods.

Differences:

◆ Applet has a good graphical interface (AWT), which runs on the client side together with the browser.

◆ Java Servlet does not have a graphical interface and runs on the server side.

Comparison of Java Servlet and CGI (Common Gateway Interface):

Compared with traditional CGI and many other CGI-like technologies, Java Servlet is more efficient, easier to use, more powerful, better portable, and more cost-effective. In the process of future technological development, Servlet is likely to completely replace CGI.

High efficiency of ◆

In traditional CGI, each request starts a new process. If the execution time of the CGI program itself is short, the cost of starting the process is likely to exceed the actual execution time. In Servlet, each request is handled by a lightweight Java thread (rather than a heavyweight operating system process).

In traditional CGI, if there are N concurrent requests for the same CGI program, the code of the CGI program is repeatedly loaded in memory for N times, while for Java Servlet, the request is handled by N threads, requiring only one copy of Servlet class code. Servlet also has more choices than CGI in terms of performance optimization.

◆ is convenient

Java Servlet provides a large number of utility routines, such as automatically parsing and decoding HTML form data, reading and setting HTTP headers, processing Cookie, tracking session state, and so on.

◆ is powerful.

In Java Servlet, many tasks that are difficult to accomplish with traditional CGI programs can be easily accomplished. For example, Java Servlet can interact directly with a Web server, while a normal CGI program cannot. Servlet can also share data among programs, making it easy to implement functions such as database connection pooling.

◆ has good portability.

Java Servlet is written in Java, and Servlet API has a complete standard. Therefore, Servlet written for IPlanet Enterprise Server can be ported to Apache, Microsoft IIS, or WebStar without any substantial changes. Almost all major servers support Servlet directly or through plug-ins.

◆ saves investment

Not only are there many cheap or even free Web servers available for personal or small-scale websites, but for existing servers, if they don't support Servlet, these features tend to be free (or require very little investment).

Comparison of Java Servlet and JSP (JavaServer Pages):

JavaServer Pages (JSP) is a technology that implements the hybrid coding of ordinary static HTML and dynamic HTML. JSP does not add any functions that cannot be implemented with Servlet in nature. However, it is more convenient to write static HTML in JSP, eliminating the need for println statements to output every line of HTML code. More importantly, with the separation of content and appearance, tasks of a different nature in page production can be easily separated: for example, HTML design by page designers while leaving space for Java Servlet programmers to insert dynamic content.

After reading the above, do you know how to compare Java Servlet with Applet, CGI and JSP? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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