An Introduction to Java Servlets

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Java Servlets are small programs that run on a Java-enabled web server and can be used to create dynamic content for webpages. They are written in the Java language and have access to all of the features of the Java platform, including networking, multithreading, and more. They provide an efficient way for developers to create interactive websites by handling requests from clients (browsers) and responding with appropriate responses. Servlets can also save data related to a particular user session so that the same results can be returned each time a user visits the website. This makes them ideal for creating personalized experiences for users on a website or application.

The Servlet Run-time Environment

(SRE) is the environment in which Servlets are executed. It consists of all the components necessary to execute a servlet, including a Java-enabled web server and a Java Runtime Environment (JRE). The SRE also includes other libraries and frameworks that can be used to create dynamic content for webpages, such as Java Server Pages (JSP) and JavaServer Faces (JSF).

Servlet Interface and Life Cycle

The life cycle of a Servlet is managed by the web container, which is part of the SRE. When a request for a page is received by the web server, it invokes the web container to load and initialize the requested servlet. The servlet processes the request and generates an appropriate response. Finally, the response is sent back to the requesting client.

Servlets are often used in applications that require user authentication or session tracking. For example, when a user logs in to an application, a session is created for that user so that their information can be tracked between requests. Other uses for servlets include creating custom search engines and dynamic content management systems.

Request and Response Objects

Servlets are designed to process HTTP requests and generate appropriate responses. To achieve this, the servlet API provides two objects -ttpServletResponse object. The request object contains information about the request sent by the client, while the response object is used to send back a response to the client.

The Servlet an important concept when developing web applications with servlets as it defines and responses should be handled within your application. It states that each incoming request should be handled in its own thread and that each request should have its own unique response. This ensures that requests from different clients do not interfere with each other, resulting in a more efficient and secure application.

Servlet Classes and Packages

The javax.servlet package contains all the classes needed to create servlets. The main class is HttpServlet, which provides methods for handling HTTP requests and generating responses. There are also other packages that provide additional functionality such as authentication, session management, and more.

Persistent and Shared Data

Servlets can also be used to store and share data between requests. This is done through the use of servlet context, which allows multiple servlets to access a common set of data. This can be useful for creating customized experiences for users or sharing information between different parts of an application.

Java Servlets provide an efficient way for developers to create interactive websites by processing HTTP requests and generating appropriate responses. They have access to all the features of the Java platform, including networking, multithreading, and more. Additionally, they can save data related to user that the same results are returned each time a user visits the website. With these capabilities in mind, it’s easy to see why Servlets are such a popular

**References**
https://beginnersbook.com/2014/04/genericservlet-class/
https://beginnersbook.com/2013/05/servlet-api/
https://www.studocu.com/in/document/kurukshetra-university/consumer-behaviour/awt-unit-3-lecture-notes-2/20762987
https://www.edureka.co/blog/java-servlets
https://www.digitalocean.com/community/tutorials/how-to-implement-caching-in-node-js-using-redis
https://docs.parseplatform.org/cloudcode/guide/

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