A brief introduction to the Servlet life cycle and working principle (pictures and text)

The Servlet life cycle refers to the entire process from creation to destruction of a servlet, which can be divided into three stages: 1. Initialization stage, calling the init() method to initialize the Servlet; 2. Running stage (processing requests), the container will Request to create a ServletRequest object representing an HTTP request and a ServletResponse object representing an HTTP response, and then pass them as parameters to the service() method of the Servlet; 3. Destruction phase.

The full name of Servlet is "Java Servlet", which means small service program or service connector in Chinese. It is a program running on a Web server or application server. It serves as a request from a Web browser or other HTTP client and a database on the HTTP server or The middle layer between applications. Servlet has the characteristics of being independent of platform and protocol. Its main function is to browse and generate data interactively and generate dynamic Web content.

There are two ways to implement distributed session management in JavaServlet: 1. Session replication: Copy session data to each server. 2. Session distribution: Use a centralized storage service to store session data and access it from multiple servers. The specific implementation methods are: session replication configures true in the web. session data.

JavaServlet can be used for: 1. Dynamic content generation; 2. Data access and processing; 3. Form processing; 4. File upload; 5. Session management; 6. Filter. Example: Create a FormSubmitServlet to handle form submission, taking name and email as parameters, and redirecting to success.jsp.

JavaWeb development technology stack: Master JavaEE, Servlet, JSP, Spring and other technologies used for Web development. With the rapid development of the Internet, in today's software development field, the development of Web applications has become a very important technical requirement. As a widely used programming language, Java also plays an important role in the field of Web development. The JavaWeb development technology stack involves multiple technologies, such as JavaEE, Servlet, JSP, Spr

The Servlet container is an application that provides the Servlet running environment. It is responsible for managing the life cycle of the Servlet 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. The main functions of the Servlet container are life cycle management: The Servlet container is responsible for managing the life cycle of the 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 pages, etc. Class loading: The Servlet container is responsible for adding

Servlet is a very commonly used technology in Java Web application development. However, some Servlet errors will inevitably occur during the development process. How to solve and avoid Servlet errors has become a top issue for many Java developers. This article will introduce some common Servlet errors and their solutions based on personal experience and related information. ClassNotFoundException When we try to load a class, if the class does not exist or cannot be accessed by the system,

In the world of Java Web development, understanding the HttpSession interface is key to creating dynamic and responsive web applications. In this article, we will explore what the HttpSession interface is, how it works, and why it plays a crucial role in the Servlet specification. What is the HttpSession interface? At its core, the HttpSession interface is a fundamental component of the JavaServlet API, which enables web developers to track a user's session across multiple HTTP requests. When a user accesses a web application for the first time, a unique session is created to represent their interaction. This session allows the application to maintain state between requests and remember information about