ServletConfig is used by only single servlet to get configuration information from web. xml whereas ServletContext is used by multiple objects to get configuration information from xml files.
What is ServletContext?
public interface ServletContext. Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file. There is one context per “web application” per Java Virtual Machine.
What is diff between JSP and servlet?
ServletJSPServlet is a java code.JSP is a html based code.Writing code for servlet is harder than JSP as it is html in java.JSP is easy to code as it is java in html.Servlet plays a controller role in MVC approach.JSP is the view in MVC approach for showing output.
What is the use of ServletConfig object?
ServletConfig object is created by web container for each servlet to pass information to a servlet during initialization. This object can be used to get configuration information from web.xml file.How can I get ServletContext and ServletConfig object in a spring bean?
- Implementing Spring *Aware interfaces, for these ServletContextAware and ServletConfigAware interfaces. …
- Using @Autowired annotation with bean variable of type ServletContext and ServletConfig .
How many ServletContext objects are available for?
There is only one ServletContext object per web application. If any information is shared to many servlet, it is better to provide it from the web.
What is the difference between web server and web container?
The main difference between the web containers and application server is that most web containers such as Apache Tomcat implements only basic JSR like Servlet, JSP, JSTL wheres Application servers implements the entire Java EE Specification. Every application server contains web container.
How many ServletContext is available for an entire Web application?
There’s only one ServletContext for an entire web app, and all the parts of the web app share it. But each servlet in the app has its own ServletConfig. The Container makes a ServletContext when a web app is deployed, and makes the context available to each Servlet and JSP (which becomes a servlet) in the web app.Which method can be used to access the ServletConfig?
Use the super. init(ServletConfig) method to pass the ServletConfig object to your servlet. It is necessary because it provides servlets with access to the ServletContext object and initialization parameters.
What is ServletConfig interface?Interface ServletConfig A servlet configuration object used by a servlet container to pass information to a servlet during initialization.
Article first time published onCan we set attributes in ServletConfig?
Attributes in the ServletConfig object cannot be set. We can set the attributes in ServletContext that other servlets can use.
In which package servlet config and ServletContext interfaces are present?
ServletContext is an interface from the javax. servlet package and its object can be obtained from the getServletContext() method of the ServletContext i.e.
What is the difference between HTML and JSP?
JSP is a technology which is used to create dynamic web applications. HTML is a standard markup language which is used to create the structure of web pages. JSP allow to place the custom tag or third party tag. It does not allow to place the custom tag or third party tag.
Is JSP better than PHP?
JSP based web applications are a bit more harder to deploy than PHP based web applications, but you gain the ability of creating Servlets. PHP requires less server administration skills to setup properly and get running, is fast to learn, and allows fast creation of simple applications.
What is difference between Java and JSP?
In short, Java is object oriented computing language which can do almost anything you want to do. JSP is technology based on java, JSP processor generates webpages using java language. Java is a pure object oriented language, by object oriented I mean, we create classes and instantiate objects of those classes.
What is WebApplicationContext in spring?
WebApplicationContext in Spring is web aware ApplicationContext i.e it has Servlet Context information. In single web application there can be multiple WebApplicationContext. That means each DispatcherServlet associated with single WebApplicationContext. … xml will be common for all the servlet configuration files.
What is the use of context loader listener in spring?
ContextLoaderListner is a Servlet listener that loads all the different configuration files (service layer configuration, persistence layer configuration etc) into single spring application context. This helps to split spring configurations across multiple XML files.
How servlet context is implemented in Spring MVC?
- Use below code to autowire ServletContext object in SpringMVC @Autowired ServletContext context; …
- You can get it in your controller like this; private ServletContext context; public void setServletContext(ServletContext servletContext) { this.context = servletContext; }
What are the 4 types of containers in Java?
- Java EE server: The runtime portion of a Java EE product. …
- Enterprise JavaBeans (EJB) container: Manages the execution of enterprise beans for Java EE applications. …
- Web container: Manages the execution of JSP page and servlet components for Java EE applications.
What is the difference between web container and EJB container?
Container Types Enterprise JavaBeans (EJB) container: Manages the execution of enterprise beans for Java EE applications. Enterprise beans and their container run on the Java EE server. Web container: Manages the execution of web pages, servlets, and some EJB components for Java EE applications.
What is difference between Weblogic and Tomcat?
Weblogic is an enterprise and commercial software which requires a license and has a wide variety of features for large-scale industrial applications that eases the life of a developer whereas Tomcat is a lightweight and free open source software which is suitable for small web application or companies where it is cost …
What is the difference between servlet and filter?
Filter provides functionality which can be “attached” to any web resource. Servlet used for performing action which needs for particular request as user login, get response based on user role, interacts with database for getting data, business logic execution, and more.
How many objects you may create for ServletContext?
There can only be one ServletContext object per web application. If there is any need to provide the information that is shared to many servlet it is better to provide using the web. xml file with the <context-param> element.
Why RequestDispatcher is been used?
The RequestDispatcher interface provides the facility of dispatching the request to another resource it may be html, servlet or jsp. This interface can also be used to include the content of another resource also. It is one of the way of servlet collaboration.
How many methods are common in ServletConfig and FilterConfig interfaces?
There are following 4 methods in the FilterConfig interface. public void init(FilterConfig config): init() method is invoked only once it is used to initialize the filter. public String getInitParameter(String parameterName): Returns the parameter value for the specified parameter name.
What are Servlets Mcq?
Explanation: Servlet has various components like container, config, context, filter. Servlet filter provides the dynamic interception of requests and responses to transform the information.
Which method of the HttpServletRequest object is used?
Object of the HttpServletRequest is created by the Servlet container and, then, it is passed to the service method (doGet(), doPost(), etc.) of the Servlet.
What is JSP life cycle?
A JSP life cycle is defined as the process from its creation till the destruction. This is similar to a servlet life cycle with an additional step which is required to compile a JSP into servlet.
What is the use of JSP?
JSPs are usually used to deliver HTML and XML documents, but through the use of OutputStream, they can deliver other types of data as well. The Web container creates JSP implicit objects like request, response, session, application, config, page, pageContext, out and exception.
Which method is called when client request comes?
The web server calls the service() method to handle requests coming from the client( web browsers) and to send response back to the client. This method determines the type of Http request (GET, POST, PUT, DELETE, etc.) . This method also calls various other methods such as doGet(), doPost(), doPut(), doDelete(), etc.
What are the two main types of servlet?
- 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.
