Does Java still use servlets now?

Java Servlet is a program that runs on a Web server or application server. It serves as an intermediate layer between requests from a Web browser or other HTTP clients and the database or application on the HTTP server. Using Servlets, you can collect user input from web forms, present records from databases or other sources, and dynamically create web pages.

Recently in some forums, people have even said that "servlet technology is obsolete". Is servlet technology really a thing of the past? My answer is no. I think Servlet can respond to any type of request and is still widely used in the field of server development. In order to give everyone a clearer and more intuitive understanding of Servlet, I specially compared it with JSP.

Advantages of JSP:

Write once and run anywhere. No changes need to be made to the code other than the system.

Multi-platform support for the system. Basically, you can develop in any environment on all platforms, deploy the system in any environment, and expand in any environment. Compared with the limitations of ASP, the advantages of JSP are obvious.

Powerful scalability. From just a small Jar file to run Servlet/JSP, to multiple servers for clustering and load balancing, to multiple Applications for transaction processing and message processing, from one server to countless servers, Java has shown a huge vitality.

Diverse and powerful development tool support. This is very similar to ASP. Java already has many excellent development tools, many of which are available for free, and many of which can run smoothly on multiple platforms.

Supports server-side components. Web applications require powerful server-side components to support them, and developers need to use other tools to design components that implement complex functions for web page calls to enhance system performance. JSP can use mature JAVA BEANS components to implement complex business functions.

JSP Disadvantages:

The same as ASP, some of Java's advantages are exactly its fatal problems. It is precisely because of cross-platform functionality and extreme scalability that the complexity of the product is greatly increased.

The running speed of Java is achieved by using class resident memory, so the memory it uses in some cases is indeed the "lowest performance-price ratio" compared to the number of users.

Servlet advantages:

Convenience

Servlet provides a large number of utility routines, such as automatically parsing and decoding HTML form data, reading and setting HTTP headers, handling cookies, tracking session status, etc.

Powerful

In Servlet, many tasks that are difficult to complete using traditional CGI programs can be easily completed. For example, Servlets can interact directly with Web servers, but ordinary CGI programs cannot. Servlets can also share data between various programs, making functions such as database connection pools easy to implement.

Good portability

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

Saving investment

Not only are there many cheap or even free web servers available for personal or small-scale websites, but also for existing servers, if it does not support Servlet, add this Some features are also often free (or require only a minimal investment).

Disadvantages:

Servlet has no graphical interface and runs on the server side.

Servlet is an early and imperfect product. It is good to write the business layer, but it is not ideal to write the presentation layer, and the two layers are mixed.

Finally, let’s make a key point: Servlet will be widely used for a long time in the future, so it is too early to discuss the issue of obsolescence.

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