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Yes, by implementing SingleThreadModel interface
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How does Apache httpd work?
Tomcat is a servlet container, and the following is how a servlet container works The init, service, and destroy methods are the servlet's lifecycle methods. The init method is called once by the servlet container after the servlet class has been instantiated to indicate to the servlet that it being placed into service. The init method must complete successfully before the servlet can receive any requests. A servlet programmer can override this method to write initialization code that needs to run only once, such as loading a database driver, initializing values, and so on. In other cases, this method is normally left blank. The service method is then called by the servlet container to allow the servlet to respond to a request. The servlet container passes a javax.servlet.ServletRequest object and a javax.servlet.ServletResponse object. The ServletRequest object contains the client's HTTP request information and the ServletResponse encapsulates the servlet's response. These two objects enable you to write custom code that determines how the servlet services the client request. The servlet container calls the destroy method before removing a servlet instance from service. This normally happens when the servlet container is shut down or when the servlet container needs some free memory. This method is called only after all threads within the servlet's service method have exited or after a timeout period has passed. After the servlet container calls destroy, it will not call the service method again on this servlet. The destroy method gives the servlet an opportunity to clean up any resources that are being held (for example, memory, file handles, and threads) and make sure that any persistent state is synchronized with the servlet's current state in memory. For Better Picture, Visit below article full of images to clear the concept : http://shivasoft.in/blog/java/servlet/how-container-handles-the-servlet-request/
What is doPost in servlet?
doPost() is the method in the servlet that is used to service the Http requests submitted using the Post option. HTML forms can be submitted in two ways using the Get method and the Post method. You can specify the method while declaring the form itself. So you will have two methods in the servlet doGet() and doPost() each for one of them
Describe the life cycle of servelet?
Each servlet has the same life cycle: * A server loads and initializes the servlet * The servlet handles zero or more client requests * The server removes the servlet (some servers do this step only when they shut down) == When a server loads a servlet, the server runs the servlet's init method. Initialization completes before client requests are handled and before the servlet is destroyed. Even though most servlets are run in multi-threaded servers, servlets have no concurrency issues during servlet initialization. The server calls the init method once, when the server loads the servlet, and will not call the init method again unless the server is reloading the servlet. The server can not reload a servlet until after the server has destroyed the servlet by calling the destroy method. == After initialization, the servlet is able to handle client requests. This part of the servlet life cycle was handled in the previous lesson. == Servlets run until the server are destroys them, for example, at the request of a system administrator. When a server destroys a servlet, the server runs the servlet's destroy method. The method is run once; the server will not run that servlet again until after the server reloads and reinitializes the servlet. When the destroy method runs, another thread might be running a service request. The Handling Service Threads at Servlet Termination lesson shows you how to provide a clean shutdown when there could be long-running threads still running service requests.
What is doGet method in servlet?
The doGet() method is the method inside a servlet that gets called every time a request from a jsp page is submitted. The control first reaches the doGet() method of the servlet and then the servlet decides what functionality to invoke based on the submit request. The get method called when the type of page submission is "GET" There is another way of submitting requests from a jsp page is "POST" and when that happens it calls the doPost() method inside the servlet.
How do you get servlet context instance to servlet?
Through following method we get servetContext instance in servet. We call following method in init(ServetConfig cfg) { ServertContexr = cfg.getServletContext(); }
Which method must to override in Servlet?
There are 3 main types of requests that get processed by a Servlet. They are: • Get • Post • Put Each of them have a corresponding doXXX() method in the Servlet class which would be: • doGet • doPost • doPut You must override either of these methods based on the type of requests that would be processed by your servlet
Why no need of main in servlet?
I think you mean: why isn't there a function required in a servlet like the following? public static void main(String[] args) { } Because the main() method is what the Java VM 'boots up' into...it's the first thing the JVM executes. A servlet, however, is running inside a servlet container (e.g., Tomcat), which is running inside a JVM. *That* JVM gets started with a main() method, but unless you intend to run your servlet from the commandline, there's no explicit need for a main() method.
What use import javaxservlethttpHttpServletRequest in java?
The Http RequestWhen a user hits a URL with a servlet at the other end, the Servlet Container creates an HttpServletRequest object. It passes this object as an argument to the servlet's service methods (doPut(), doGet(), and doPost()). There is a lot of information in this object, including the login details of the user making this request and the name of the HTTP method with which this request was made.
What is anatomy of java servlet?
A Servlets skeleton would look like below: /* * servlet name * * servlet description * All other stuff that is part of a Standard Class comment section */ //package declarations //import statements public class ServletName extends HttpServlet { // Instance Variables /** * Code to Initialize the Servlet */ public void init() throws ServletException { // Servlet Initialization Code goes here } /** * The Service Method * Gets invoked for every request submitted to the Servlet * This method is optional. We mostly use doGet, doPost Methods */ protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // Code for the Service Method goes here } /** * Process a GET request * */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // Code for the doGet() method goes here } /** * Process a POST request * */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // Code for the doPost() method goes here } /** * Process a PUT request * */ protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //Code for the doPut() method goes here } /** * You can have any number of methods for your processing * here. There is no limit as to the number of methods or * any restrictions on what you can name them. * Since this is all java code, you need to keep them * syntactically correct as per Java Coding Standards. */ /** * Clean-Up */ public void destroy() { // clean up activities before the Servlet is put to death } }
Servlet life cycle?
The javax.servlet.Servlet interface defines the three methods known as life-cycle method. public void init(ServletConfig config) throws ServletException public void service( ServletRequest req, ServletResponse res) throws ServletException, IOException public void destroy() First the servlet is constructed, then initialized wih the init() method. Any request from client are handled initially by the service() method before delegating to the doXxx() methods in the case of HttpServlet. There are two more methods..... public abstract String getServletInfo() public abstract ServletConfig getServletConfig()
Generic Servlet and HTTP Servlet?
javax.servlet.GenericServletSignature: public abstract class GenericServlet extends java.lang.Object implements Servlet, ServletConfig, java.io.SerializableGenericServlet defines a generic, protocol-independent servlet.GenericServlet gives a blueprint and makes writing servlet easier.GenericServlet provides simple versions of the lifecycle methods init and destroy and of the methods in the ServletConfig interface.GenericServlet implements the log method, declared in the ServletContext interface.To write a generic servlet, it is sufficient to override the abstract service method.javax.servlet.http.HttpServletSignature: public abstract class HttpServlet extends GenericServlet implements java.io.SerializableHttpServlet defines a HTTP protocol specific servlet.HttpServlet gives a blueprint for Http servlet and makes writing them easier.HttpServlet extends the GenericServlet and hence inherits the properties GenericServlet.
How do you write a servlet?
Servlet SkeletonIf I ask you, what are the components of a Java class, you'll happily tell me that, there are first package statements and then imports and then the class declaration. Within the class brackets, we have constructors, instance variables, methods etc. That was easy, wasn't it?The same way, every Servlet has a certain set of components that are mandatory for its well-being. (I just got carried away a bit) Or I must say, for its proper functioning.A Servlets skeleton would look like below:/** servlet name** servlet description* All other stuff that is part of a Standard Class comment section*///package declarations//import statementspublic class ServletName extends HttpServlet {// Instance Variables/*** Code to Initialize the Servlet*/public void init() throws ServletException{// Servlet Initialization Code goes here}/*** The Service Method* Gets invoked for every request submitted to the Servlet* This method is optional. We mostly use doGet, doPost Methods*/protected void service(HttpServletRequest req,HttpServletResponse resp)throws ServletException, IOException{// Code for the Service Method goes here}/*** Process a GET request**/protected void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException, ServletException{// Code for the doGet() method goes here}/*** Process a POST request**/protected void doPost(HttpServletRequest request,HttpServletResponse response)throws IOException, ServletException{// Code for the doPost() method goes here}/*** Process a PUT request**/protected void doPut(HttpServletRequest req,HttpServletResponse resp)throws ServletException, IOException{//Code for the doPut() method goes here}/*** You can have any number of methods for your processing* here. There is no limit as to the number of methods or* any restrictions on what you can name them.* Since this is all java code, you need to keep them* syntactically correct as per Java Coding Standards.*//*** Clean-Up*/public void destroy(){// clean up activities before the Servlet is put to death}}The above is what a Servlets skeleton would look like
