Servlet Container Revealed: A Deeper Understanding of the Servlet Runtime Environment

php editor Baicao reveals the secrets of the Servlet container for you and gives you an in-depth understanding of the Servlet operating environment. The Servlet container is an environment for deploying and running Servlets, and is responsible for managing the Servlet life cycle, request processing, etc. An in-depth understanding of the working principles and mechanisms of Servlet containers is crucial to developing efficient and stable Web applications. Let us explore the mysteries of Servlet containers together and improve our understanding and application of Servlet technology.

Main functions of Servlet container

• Life cycle management: The Servlet container is responsible for managing the life cycle of Servlet, including startup, initialization, service and destruction.
• Web Services: The Servlet container provides web services, such as security, transactions, etc.
• Resource management: Servlet container manages resources, such as Servlet, jsP, html page, etc.
• Class loading: The Servlet container is responsible for loading the Servlet class.
• Deployment: The Servlet container is responsible for deploying Servlets to the web container.

Servlet container deployment demonstration

<!-- web.xml -->
<web-app>
<servlet>
<servlet-name>HelloWorldServlet</servlet-name>
<servlet-class>com.example.HelloWorldServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>

// HelloWorldServlet.java
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.Http.httpservlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "HelloWorldServlet", urlPatterns = "/hello")
public class HelloWorldServlet extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.getWriter().println("Hello World!");
}
}

Common Servlet Containers

• Tomcat: Tomcat is a Servlet container developed by the Apache Software Foundation. It is one of the most popular Servlet containers currently.
• Jetty: Jetty is a Servlet container developed by the Eclipse Foundation. It is known for its lightweight and high performance.
• GlassFish: GlassFish is a Servlet container developed by oracle company. It is a reference implementation of the Java EE standard.
• WildFly: WildFly is a Servlet container developed by Red Hat. It is the open source version of JBoss Application Server.

Summarize

The Servlet container is an application that provides a Servlet running environment. It is responsible for managing the Servlet life cycle and providing necessary web services, such as security, transactions, etc. There are many types of Servlet containers, the most common of which are Tomcat and Jetty.

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