servlet diagram

1. What is Servlet and how it works?
2. What is Servlet and why it is used?
3. What is the Servlet life cycle?
4. What is Servlet example?
5. What are the two main types of servlet?
6. Is Servlet a framework?
7. What is HTTP servlet?
8. What is API in Java?
9. What is Servlet Mapping?
10. Which lifecycle method is called once in Servlet life?
11. WHO calls doGet () and doPost () method?
12. Can we have two dispatcher servlet?

What is Servlet and how it works?

Servlets are the Java programs that runs on the Java-enabled web server or application server. They are used to handle the request obtained from the web server, process the request, produce the response, then send response back to the web server. Properties of Servlets : Servlets work on the server-side.

What is Servlet and why it is used?

A servlet is a Java programming language class that is used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers.

What is the Servlet life cycle?

A servlet life cycle can be defined as the entire process from its creation till the destruction. ... The servlet is initialized by calling the init() method. The servlet calls service() method to process a client's request. The servlet is terminated by calling the destroy() method.

What is Servlet example?

Simply put, a Servlet is a class that handles requests, processes them and reply back with a response. For example, we can use a Servlet to collect input from a user through an HTML form, query records from a database, and create web pages dynamically.

What are the two main types of servlet?

There are two main servlet types, generic and HTTP:

• Generic servlets. Extend javax. servlet. GenericServlet. Are protocol independent. ...
• HTTP servlets. Extend javax. servlet. HttpServlet. Have built-in HTTP protocol support and are more useful in a Sun Java System Web Server environment.

Is Servlet a framework?

In contrast, Struts and the Spring MVC Framework are action-oriented frameworks that provide a thinner abstraction layer over the servlet API.
...
At a glance.

What is HTTP servlet?

A servlet is a Java class that runs in a Java-enabled server. An HTTP servlet is a special type of servlet that handles an HTTP request and provides an HTTP response, usually in the form of an HTML page. ... WebLogic Server fully supports HTTP servlets as defined in the Servlet 2.3 specification from Sun Microsystems.

What is API in Java?

The full form of API is Application Programming Interface. It is a document which gives you the list of all the packages, classes, and interfaces, along with their fields and methods. Using these API's, the programmer can know how to use the methods, fields, classes, interfaces provided by Java libraries.

What is Servlet Mapping?

Servlet mapping specifies the web container of which java servlet should be invoked for a url given by client. ... It maps url patterns to servlets. When there is a request from a client, servlet container decides to which application it should forward to.

Which lifecycle method is called once in Servlet life?

Note: The init() method is called only once during the life cycle of servlet. Each time the web server receives a request for servlet, it spawns a new thread that calls service() method.

WHO calls doGet () and doPost () method?

If the HTTP Method is a GET, the service() method calls doGet(). If the HTTP request Method is a POST, the service() method calls doPost(). Yes, there are other HTTP 1.1 Methods besides GET and POST.

Can we have two dispatcher servlet?

You can have as many DispatcherServlets as you want. Basically what you need to do is duplicate the configuration and give the servlet a different name (else it will overwrite the previous one), and have some separate configuration classes (or xml files) for it.