Can we define constructor in Servlet class ?
- Yes, we can define constructor in Servlet class.
- Constructor may be a Default Constructor or Parameterised Constructor. If we didn’t write any constructor then the default constructor will be executed. Because, to read init parameters of a servlet we need servlet config object in the life cycle of the servlet.
- Servlet config object is created after the execution of the constructor.
Servlet Constructor
Sample Code
import javax.servlet.http.*;
import java.io.*;
public class ConstructorServlet extends HttpServlet
{
String str1, str2, str3;
public ConstructorServlet()
{
str1 = "Constructor";
}
public void init()
{
str2 = "init() method";
}
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
str3 = " service() method";
out.println("<h3>"+ str1 + "<br>" + str2 + "<br>" + str3 + "</h3>");
out.close();
}
} JavaScript
Output
Constructor
init() method
service() methodJavaScript
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