What is init-param in servlet?

What is init-param in servlet?

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 init-param in web xml?

init-param. This is an element within the servlet. The optional init-param element contains a name/value pair as an initialization parameter of the servlet. Use a separate set of init-param tags for each parameter. You can access these parameters with the javax.

What is init parameters in Java?

Initialization parameters are stored as key value pairs. They are included in web. xml file inside init-param tags. The key is specified using the param-name tags and value is specified using the param-value tags. Servlet initialization parameters are retrieved by using the ServletConfig object.

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 the use of INIT param and context param?

defines a value available to a single specific servlet within a context. defines a value available to all the servlets within a context.

What is the difference between context init parameter and servlet init parameter?

Servlet init parameters are for a single servlet only. Nothing outside that servlet can access that. 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 Getrequestdispatcher in servlet?

The RequestDispatcher is an Interface that comes under package javax. servlet. Using this interface we get an object in servlet after receiving the request. Using the RequestDispatcher object we send a request to other resources which include (servlet, HTML file, or JSP file).

When init parameters are read by container?

The servlet init parameters are read only ONCE—when the Container initializes the servlet. When the Container makes a servlet, it reads the DD and creates the name/value pairs for the ServletConfig.

What are context initialization parameters?

Context Initialization parameters are the parameter name and value pairs that you can specify in the deployment descriptor file (the web. xml file). Here you can specify the parameters that will be accessible to all the servlets in the web application.

What is the use of request Getrequestdispatcher?

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.

What is difference between SendRedirect and RequestDispatcher?

The RequestDispatcher interface allows you to do a server side forward/include whereas sendRedirect() does a client side redirect. SendRedirect() will search the content between the servers. it is slow because it has to intimate the browser by sending the URL of the content.

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.