What is difference between ServletConfig and ServletContext?
But, the difference lies in the fact that information shared by ServletConfig is for a specific servlet, while information shared by ServletContext is available for all servlets in the web application.
What is ServletContext in Java?
Interface 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 servlet context path?
The context path is the portion of the request URI that is used to select the context of the request. The context path always comes first in a request URI. The path starts with a “/” character but does not end with a “/” character. For servlets in the default (root) context, this method returns “”.
Is ServletContext thread safe?
We can deduce from the Java Servlet Specification, that sharing attributes between servlets via ServletContext#setAttribute and ServletContext#getAttribute is indeed thread-safe.
How many ServletContext objects are available for?
one ServletContext object
There is only one ServletContext object per web application.
How many ServletContext is available for an entire web application?
one ServletContext
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.
What is ServletContext attribute?
ServletContext attributes are attributes at the container[tomcat] level, as per the docs /** * * 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.
What is spring boot ServletContext?
It’s used to wire the configurations from Spring beans together and use them for the application. Use ApplicationContext if you want to retrieve the information of Spring beans. Use ServletContext if you want to get/set attribute those shared to all Servlet.
How do I find context path?
The context path always comes first in a request URI. The path starts with a “/” character but does not end with a “/” character. For servlets in the default (root) context, this method returns “”. The container does not decode this string.
What is context path in URL?
The context path is the path to Confluence relative to the root directory of the webserver. For example, the context path for this site is an empty string, because it is deployed at the root. The context path for a Confluence instance deployed at http://www.example.com/confluence would be /confluence .
How is servlet different from CGI?
In this article, we will understand the difference between the two functionalities in web-based applications namely servlets and CGI.
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Difference between Java Servlet and CGI.
| Basis | Servlet | CGI |
|---|---|---|
| Speed | Its can speed is slower. | It can speed is faster. |
| Platform dependency | It can be Platform dependent | It can be not Platform dependent. |
How many ServletContext objects are available for an interview application?
There is only one ServletContext object per web application.
How can I access servlet initialization parameters?
To retrieve initialization parameters, call the getInitParameter(String name) method from the parent javax. servlet. GenericServlet class. When passed the name of the parameter, this method returns the parameter’s value as a String .
What is ServletContext in spring?
How do I add a context parameter in web xml?
You set each context-param within a single context-param element, using <param-name> and <param-value> elements. You can access these parameters in your code using the javax. servlet.
| Element | Required/ Optional | Description |
|---|---|---|
| <param-name> | Required | The name of a parameter. |
| <param-value> | Required | The value of a parameter. |
What is a context path?
Simply put, the context path is a name with which a web application is accessed. It is the root of the application. By default, Spring Boot serves the content on the root context path (“/”). So, any Boot application with default configuration can be accessed as: http://localhost:8080/
What is context root in URL?
The context root for an application defines the location at which the module can be accessed. The context root is part of the URL you use to connect to the application. A URL reference to an IBM® SPSS® Collaboration and Deployment Services application includes the following elements: URL prefix.
What is the use of context path?
The context path of a web application defines the URL that end users will access the application from. A simple context path like myapp means the web app can be accessed from a URL like http://localhost:8080/myapp.
Is CGI better than servlet?
Servlet is more secure than CGI as it uses Java. The speed, performance and efficiency of the servlet is better than CGI. CGI scripts can be directly processed. On the contrary, the servlet first translates and compile the program then process it.
What are the 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.
How many ServletContext is created for an application?
What is context config location in web xml?
The initialization parameter contextConfigLocation tells Spring where to load configuration files. The <load-on-startup> tag tells the servlet container to load this servlet upon start up with highest priority.
What is the name of the servlet configuration file?
This file is named web. xml , and resides in the app’s WAR under the WEB-INF/ directory. web. xml is part of the servlet standard for web applications.
How can I get ServletContext and ServletConfig objects in a Spring bean?
There are two ways to get Container specific objects in the spring bean:
- Implementing Spring *Aware interfaces, for these ServletContextAware and ServletConfigAware interfaces.
- Using @Autowired annotation with bean variable of type ServletContext and ServletConfig .
Can we have 2 application context in Spring?
We can have multiple application contexts that share a parent-child relationship. A context hierarchy allows multiple child contexts to share beans which reside in the parent context. Each child context can override configuration inherited from the parent context.