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Most people do not understand the knowledge points of this article "what are the knowledge points of servlet and tomcat", so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this article, "what are the knowledge points of servlet and tomcat?"

What is servlet?

In order to make the web server cooperate with the two different software systems of web application, a set of standard interface is needed, and servlet is the most important one.

Stipulate that:

The web server can access classes that implement the servlet interface in any web application.

The program code used to be dynamically called by the web server in the web application is located in the implementation class of the servlet interface.

Sun (now acquired by oracle... ) A series of standard java interfaces (collectively referred to as java servlet api) that web applies to web servers for collaboration are developed.

Sun has also stipulated some details about the release and running of web applications on web servers. Sun calls this series of standard java interfaces and protocols servlet specifications.

Servlet is a small plug-in that runs on the server.

What is the servlet container?

In the servlet specification, the web server that can publish and run javaweb applications is called servlet container, and its main special name is to dynamically execute the program code in the servlet implementation class of javaweb applications.

What is tomcat?

Tomcat is both a servlet container and a lightweight web server.

Apache server, microsoft iis, apache tomcat are all web servers.

When tomcat is a web server, it is mainly responsible for the implementation of http transmission and other work.

When tomcat is used as a servlet container, it is mainly responsible for parsing request, generating servletrequest and servletresponse, passing them to the corresponding servlet (calling the service () method), and then returning the corresponding results of servlet.

Tomcat composition and structure

Server, which represents the entire servlet container component, is the top-level element of tomcat. It can contain one or more service

Service, which contains an engine and one or more connector

Connector, which represents the component that actually interacts with the client program, is responsible for receiving customer requests and returning response results to the customer

Engine, which processes all customer requests received by connector in the same service

Host, which can contain multiple host in engine, each host defines a virtual host, which can contain one or more web applications

Context, a host can contain multiple context, and each context represents a single web application running on a virtual host.

These fields are configured in conf/server.xml. Here is a default server.xml for apache tomcat 6.0.36:

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