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How to read servlet init parameter?

When configuring a servlet in the web.xml file we can define some init parameter in the servlet configuration section. This init parameter can be used for instance where a configuration file of our application is stored. This simple servlet show how to obtains these parameters value.

package com.javacoderanch.example.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class InitParameterServlet extends javax.servlet.http.HttpServlet
	implements javax.servlet.Servlet {
    
    protected void doGet(HttpServletRequest request,
	    HttpServletResponse response) throws ServletException, IOException {
	doPost(request, response);	
    }

    protected void doPost(HttpServletRequest request,
	    HttpServletResponse response) throws ServletException, IOException {

	//
	// Get application configuration path
	//
	String configPath = getInitParameter("configPath");

	System.out.println("Configuration Path: " + configPath);
    }
}