ServletContext can be one of the warningsSeparated interfaces available in javax.servlet.*; The incontinence ServletContext object is accessible via the web approach. The ServletContext object is simply created by the container when we deploy each of our web applications.

Suppose there is a web application with two servlet classes and they need to know some technical values ​​from the web.xml, in this case the ServletContext concept would be great, I mean all the servlets that are in the current web application , can do this sort of accessing context values ​​from their web.xml, but this is not the case during ServletConfig, in particular, only a servlet has the ability to access values. Since web.xml is often specified, which is located in , I hope you remember that you had your suspicions? Just check Sample ServletConfig

How Can We Help You Include A ServletContext Object In Our Servlet Class

In servlet programming, there are several approaches to getting the object associated with the ServletContext configuration interface

What is servlet context in Java?

What is a servlet context. ServletContext is the best configuration object to create when starting a web application. It consists of various initialization options that can be configured specifically in the web.xml file.

ServletConfig = getServletConfig();
Context ServletContext = conf.getServletContext();

• First get another object from the ServletConfig interface
• ServletConfig interface Includes an Instruct method to get the context object, getServletContext();

< /ul>

Direct approach, just call the getServletContext() method commercially available in GenericServlet [predefined]. I usually just extend our class with HttpServlet, but we know that HttpServlet is a special subclass of GenericServlet.

Java4s public class extends HttpServlet

avoid public doGet/doPost(-,-)

//….

ServletContext ctx = getServletContext() ;

We will definitely get the ServletContext object after using the HttpServletRequest object if I have a direct method in the HttpServletRequest interface.

Java4s public class extends HttpServlet

empty public doGet/doPost(HttpServletRequest req,-)

ServletContext ctx = req.getServletContext();

< /p>

Get Data From The Provide Object Of The ServletConfig Interface



servletcontext these 2 forms to get records from web..xml [In web.xml we have write tag to provide specific values ​​and this should write on it outside < tag servlet> as a context must be available to all servlet programs ].

In general, database-bound properties are meant to be written in situations where you want eachthe other servlet was just accessing the same data.

• public String getInitParameter(“parameter name”);
• public Enumeration getInitParameterNames();

I won’t explain these methods further, they are similar to Get Client Input Data Servlet, but here we are definitely getting values ​​from web.xml, that’s all.

ServletContext Example

Directory Structure

Required Files

• index.html
• OnServletContext.java
• web.xml

Index.html

   
       Servlet context example
           

OnServletContext.java

java4s package;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;Public class OnServletContext extends HttpServletProtected invalid doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException                     PrintWriter pw=res.getWriter();res.setContentType("text/html");// I use the second way to create a context objectServlet context    context=getServletContext(); s1=context.getInitParameter("n1");s2=context.getInitParameter("n2");pw.println("valuese n1 is " +s1+", so n2 " +s2);pw.close();   

What is difference between ServletConfig and servlet context?

ServletConfig is only used by dual servlets to get configuration information from the web. xml while ServletContext has several objects trying to get layout information from XML files.

Enjoy a faster

Exempel Pa Servletkontext
Przyklad Kontekstu Serwletu
Primer Konteksta Servleta
Exemplo De Contexto De Servlet
Servlet Context Voorbeeld
Ejemplo De Contexto De Servlet
Esempio Di Contesto Servlet
Beispiel Fur Einen Servlet Kontext
서블릿 컨텍스트 예제
Exemple De Contexte De Servlet



Carl Royal

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