Briefly describe how tomcat works

The working principle of the tomcat server can be summarized as the following points:

1. Tomcat is a process running in the JVM. It is defined as "middleware", and as the name suggests, it is an intermediate container between the Java project and the JVM.

2. The essence of a Web project is a large number of resource files and methods. The Web project does not have an entry method (ie, main method), which means that the methods in the Web project will not run automatically.

The purpose of deploying the Web project into Tomcat's webapp is very clear, that is, we hope Tomcat will call the written method to return the required resources and data to the client.

3. Tomcat can run and call the written method. Then, Tomcat must have a main method. For Tomcat, it does not know what methods the user will have. These are only determined after the project is deployed into the webapp.

From this, we can see that Tomcat uses Java reflection to implement dynamic loading, instantiation, obtaining methods, and calling methods of classes. However, the Web project deployed to Tomcat must be written according to the prescribed interface in order to be called.

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