What is the use of init param in servlet?
The init-param sub-element of servlet is used to specify the initialization parameter for a servlet.
What is the use of init param in Web xml?
A web app, that is, a “context”, is made up of one or more servlets. defines a value available to a single specific servlet within a context. defines a value available to all the servlets within a context.
Which API should be used to read init parameters?
Servlet initialization parameters are retrieved by using the ServletConfig object. Following methods in ServletConfig interface can be used to retrieve the initialization parameters: String getInitParameter(String parameter_name) Enumeration getInitParameterNames()
How do we configure init params for JSP?
In JSP, config is an implicit object of type ServletConfig. This object can be used to get initialization parameter for a particular JSP page. The config object is created by the web container for each jsp page. Generally, it is used to get initialization parameter from the web.
What are init parameters?
The init-param element within a filter or servlet definition element contains initialization parameters for that filter or servlet instance. These are distinct from context parameters, discussed in Section 4.7. Each init-param contains a param-name element and a param-value element.
What is ServletConfig and ServletContext with example?
ServletConfig is an object containing some initial parameters or configuration information created by Servlet Container and passed to the servlet during initialization….Below is the table of comparison between the two:
| ServletConfig | ServletContext |
|---|---|
| ServletConfig is servlet specific | ServletContext is for whole application |
How are servlet parameters read?
The ServletRequest interface includes methods that allow you to read the names and values of parameters that are included in a client request. The ServletRequest interface includes methods that allow you to read the names and values of parameters that are included in a client request.
What is init parameter?
What is the difference between context init parameter and servlet init parameter?
Servlet init parameters are for a single servlet only. It is declared inside the tag of Deployment Descriptor, on the other hand context init parameter is for the entire web application. Any servlet or JSP in that web application can access context init parameter.
What is application in JSP?
In JSP, application is an implicit object of type ServletContext. This object can be used to get initialization parameter from configuaration file (web. xml). It can also be used to get, set or remove attribute from the application scope. This initialization parameter can be used by all jsp pages.
What is the difference between servlet and JSP?
Servlet is a java code. Servlet is faster than JSP. JSP is slower than Servlet because the first step in JSP lifecycle is the translation of JSP to java code and then compile.
How are init parameters defined in a servlet?
Init parameters: Init parameters refers to the initialization parameters of a servlet or filter. attribute is used to define a init parameter. attribute has two main sub attributes and . The contains the name of the parameter and contains the value of the parameter.
How to define servlet parameters in web.xml?
As shown above, defining servlet initialization parameters using the “web.xml” file just boils down to using the , and tags. Furthermore, it’s possible to define as many servlet parameters as needed, as long as we stick to the above standard structure.
Where is init Param defined in web.xml?
Consider the below definition in web.xml You can see that init-param is defined inside a servlet element. This means it is only available to the servlet under declaration and not to other parts of the web application.
Which is an example of context and Servlet initialization?
CDI, Spring, Hibernate, to name a few, are glaring examples of this. Nevertheless, there’s nothing inherently wrong with using the “web.xml” file for defining context and servlet initialization parameters.