Servlet Context Attribute Solution project

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package com.cv.servlet.context.attribute;



import java.io.IOException;

import java.io.PrintWriter;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.log4j.Logger;



/**

 * Servlet implementation class ContextAttributeServlet

 * 

 * @author Chandra Vardhan

 *

 */



public class ContextAttributeServlet extends HttpServlet {



  private static final Logger LOGGER = Logger

      .getLogger(ContextAttributeServlet.class);



  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws IOException, ServletException {

    LOGGER.info("Entered into doGet(HttpServletRequest, HttpServletResponse) of ContextAttributeServlet class... ");

    doPost(request, response);

  }



  protected void doPost(HttpServletRequest req, HttpServletResponse res)

      throws ServletException, IOException {

    LOGGER.info("Entered into doPost(HttpServletRequest, HttpServletResponse) of ContextAttributeServlet class... ");

    PrintWriter pw = res.getWriter();

    res.setContentType("text/html");

    synchronized (getServletContext()) {

      getServletContext().setAttribute("fooo", "chandra");

      getServletContext().setAttribute("bar", "Budwiser");

      try {

        Thread.sleep(5000);

      } catch (InterruptedException e) {

        e.printStackTrace();

      }

      LOGGER.info("If you see fooo : 'chandra' and bar : 'Budwiser' then it is correct...");

      String foooVal = (String) getServletContext().getAttribute("fooo");

      if (foooVal != null && foooVal.equalsIgnoreCase("chandra")) {

        LOGGER.info("fooo : 'chandra' and bar : 'Budwiser' you set here and those you got as output...");

        pw.print("<font color='GREEN'>fooo : 'chandra' and bar : 'Budwiser' you set here and those you got as output...</font><br/>");

      } else {

        LOGGER.info("fooo : 'Vardhan' and bar : 'Calsberg' you set in ContextAttributeServlet2 program and those you got as output...");

        pw.print("<font color='RED'>fooo : 'Vardhan' and bar : 'Calsberg' you set in ContextAttributeServlet2 program and THIS IS WRONG output...</font><br/>");



      }

      pw.print("fooo attribute value is : " + foooVal + "<br/>");

      pw.print("bar attribute value is : "

          + getServletContext().getAttribute("bar"));

    }

    pw.close();

  }

}


 

    
package com.cv.servlet.context.attribute;



import java.io.IOException;

import java.io.PrintWriter;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.log4j.Logger;



/**

 * Servlet implementation class ContextAttributeServlet2

 * 

 * 

 * @author Chandra Vardhan

 *

 */

public class ContextAttributeServlet2 extends HttpServlet {

  private static final Logger LOGGER = Logger

      .getLogger(ContextAttributeServlet2.class);



  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws IOException, ServletException {

    LOGGER.info("Entered into doGet(HttpServletRequest, HttpServletResponse) of ContextAttributeServlet2 class... ");

    doPost(request, response);

  }



  protected void doPost(HttpServletRequest req, HttpServletResponse res)

      throws ServletException, IOException {

    LOGGER.info("Entered into doPost(HttpServletRequest, HttpServletResponse) of ContextAttributeServlet2 class... ");

    PrintWriter pw = res.getWriter();

    res.setContentType("text/html");

    synchronized (getServletContext()) {

    getServletContext().setAttribute("fooo", "Vardhan");

    getServletContext().setAttribute("bar", "Calsberg");



    pw.print("fooo attribute value is : " + getServletContext().getAttribute("fooo")+"<br/>");

    pw.print("bar attribute value is : "

        + getServletContext().getAttribute("bar"));

    }

    pw.close();

  }

}



<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Context Attribute Servlet</title>

</head>

<body>

<br>

	<br>

	<center>

		<form action="ContextAttributeServlet" method="GET" target="f1">

			<input type="submit" value="First Click here...">

		</form>

	</center>

	<br>

	<br>

	<center>

		<form action="ContextAttributeServlet2" method="GET" target="f2">

			<input type="submit" value="Immediately Click here...">

		</form>

	</center>

</body>

</html>

















#By default enabling Console appender

# Root logger option

log4j.rootLogger=INFO, stdout



# Redirect log messages to console

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target=System.out

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n



# Redirect log messages to a log file

#log4j.appender.file=org.apache.log4j.RollingFileAppender

#log4j.appender.file.File=C:\\servlet-application.log

#log4j.appender.file.MaxFileSize=5MB

#log4j.appender.file.MaxBackupIndex=10

#log4j.appender.file.layout=org.apache.log4j.PatternLayout

#log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
















<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <artifactId>ServletContextAttributeSolution</artifactId>
  <version>1.0</version>
  <packaging>war</packaging>
   <properties>
		<log4j.version>1.2.16</log4j.version>
		<java.version>1.8</java.version>
	</properties>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>${java.version}</source>
					<target>${java.version}</target>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.6</version>
				<configuration>
					<warSourceDirectory>WebContent</warSourceDirectory>
					<failOnMissingWebXml>false</failOnMissingWebXml>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>3.0-alpha-1</version>
		</dependency>
		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.0</version>
		</dependency>
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>
	</dependencies>
	<groupId>com.cv.servlet.context.attribute</groupId>
</project>
















 
<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee  http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"   version="3.1">

  <servlet>
    <servlet-name>ContextAttributeServlet</servlet-name>
    <servlet-class>com.cv.servlet.context.attribute.ContextAttributeServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ContextAttributeServlet</servlet-name>
    <url-pattern>/ContextAttributeServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>ContextAttributeServlet2</servlet-name>
    <servlet-class>com.cv.servlet.context.attribute.ContextAttributeServlet2</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ContextAttributeServlet2</servlet-name>
    <url-pattern>/ContextAttributeServlet2</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>input.html</welcome-file>
  </welcome-file-list>
</web-app>













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