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SevletContextDemoServlet.java
import java.io.IOException; import java.io.PrintWriter; import java.util.Enumeration; 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 SevletContextDemoServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void init() throws ServletException { System.out .println("------------------------------------------------------"); System.out.println(" Init method is called in " + this.getClass().getName()); System.out .println("------------------------------------------------------"); } // Method to handle GET method request. public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); ServletContext context = getServletContext(); out.print("<b>Read specfic initParam using context.getInitParameter" + "(String paramName )</b> <br><br>"); String driverName = context.getInitParameter("drivername"); out.print(driverName + "<br><br>"); out.print("<b>Read All InitParameters using " + "getInitParameterNames() method</b> <br>"); Enumeration<String> initParamNamesEnum = context .getInitParameterNames(); String paramName = ""; while (initParamNamesEnum.hasMoreElements()) { paramName = initParamNamesEnum.nextElement(); String paramValue = context.getInitParameter(paramName); out.print("<br> " + paramName + " : " + paramValue); } } // Method to handle POST method request. public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } public void destroy() { System.out .println("------------------------------------------------------"); System.out.println(" destroy method is called in " + this.getClass().getName()); System.out .println("------------------------------------------------------"); } }
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" metadata-complete="true" version="3.0"> <display-name>ServletContextInitParam</display-name> <description> This is a simple web application with a source code organization based on the recommendations of the Application Developer's Guide. </description> <context-param> <param-name>drivername</param-name> <param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value> </context-param> <context-param> <param-name>username</param-name> <param-value>system</param-value> </context-param> <context-param> <param-name>password</param-name> <param-value>oracle</param-value> </context-param> <servlet> <servlet-name>context</servlet-name> <servlet-class>SevletContextDemoServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>context</servlet-name> <url-pattern>/context</url-pattern> </servlet-mapping> </web-app>
index.html
<!DOCTYPE HTML> <html lang="en"> <head> <meta charset="UTF-8"> <title>Context Test</title> </head> <body> <li><a href="context">Context Test</a></li> </body> </html>
Environment Used
JDK version :1.6.0_30
Tomcat version : 7.0.50
To Download ServletContextInitParamApp Project Click the below link
https://sites.google.com/site/javaee4321/servlets/ServletContextInitParamApp.zip?attredirects=0&d=1
See also:
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