What is Servlet explain its life cycle with example?
A servlet life cycle can be defined as the entire process from its creation till the destruction. The servlet calls service() method to process a client’s request. The servlet is terminated by calling the destroy() method. Finally, servlet is garbage collected by the garbage collector of the JVM.
What is the life cycle of a Servlet?
The Servlet Life Cycle is the entire process of its creation till the destruction. servlet web container maintains the servlet lifecycle. Three methods are central to the life cycle of a servlet. These are init(),service() and destroy().
What is servlets explain with 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 methods in Servlet?
Methods of Servlet interface
| Method | Description |
|---|---|
| public void destroy() | is invoked only once and indicates that servlet is being destroyed. |
| public ServletConfig getServletConfig() | returns the object of ServletConfig. |
| public String getServletInfo() | returns information about servlet such as writer, copyright, version etc. |
What is generic Servlet and HTTP Servlet?
The main difference between GenericServlet and HttpServlet is that the GenericServlet is protocol independent that can be used with any protocol such as HTTP, SMTP, FTP, CGI etc. while HttpServlet is protocol dependent and is only used with HTTP protocol.
Is Java Servlets client or server side?
Java servlets are a key component of server-side Java development. A servlet is a small, pluggable extension to a server that enhances the server’s functionality.
Which is the write order of Servlet life cycle *?
Answer is “init(), service(), destroy()”
What is life cycle of servlet Mcq?
Life Cycle of a Servlet. Servlet class is loaded. Servlet instance is created. init method is invoked. service method is invoked.
What is servlet Mapping?
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.
What is servlet chaining?
What is Servlet Chaining? Taking the request from a browser window and processing that request by using multiple servlets as a chain is called servlet chaining. In servlet chaining, we perform communication between servlet programs to process the request given by a client.
Which are two main methods 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.
What are the two main types of Servlet?
There are two main types of Servlet. They are Generic and HTTP servlets.
How is the Servlet created in the life cycle?
The web container creates the instance of a servlet after loading the servlet class. The servlet instance is created only once in the servlet life cycle. The web container calls the init method only once after creating the servlet instance.
What are the three methods of a servlet?
There are three life cycle methods of a Servlet : 1 init () 2 service () 3 destroy ()
What is the init method of a servlet?
init () method: The Servlet.init () method is called by the Servlet container to indicate that this Servlet instance is instantiated successfully and is about to put into service.
What are the operations of a servlet container?
The Servlet container performs the following operations when the Servlet instance is located to service a request : It creates the ServletRequest and ServletResponse objects.