Servlet Default Headers Information Project

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package com.cv.servlet.header;



import java.io.IOException;

import java.io.PrintWriter;



import javax.servlet.RequestDispatcher;

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 HeaderServlet

 * 

 * @author Chandra Vardhan

 * 

 */

public class HeaderServlet extends HttpServlet {

  private static final Logger LOGGER = Logger.getLogger(HeaderServlet.class);



  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws IOException, ServletException {

    LOGGER.info("LOGGER : HeaderServlet doGet(HttpServletRequest,HttpServletResponse)");

    doPost(request, response);

  }



  protected void doPost(HttpServletRequest request, HttpServletResponse response)

      throws ServletException, IOException {

    LOGGER.info("LOGGER : HeaderServlet doPost(HttpServletRequest,HttpServletResponse)");

    response.setContentType("text/html");

    RequestDispatcher view = request.getRequestDispatcher("result.jsp");

    view.forward(request, response);

  }

}


 

    
package com.cv.servlet.header;



import java.io.IOException;

import java.io.PrintWriter;



import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletResponse;



import org.apache.log4j.Logger;



/**

 * Servlet Filter implementation class RequestParameterChangeFilter

 * 

 * @author Chandra Vardhan

 * 

 */



public class ResponseChangeFilter implements Filter {



  private static final Logger LOGGER = Logger

      .getLogger(ResponseChangeFilter.class);



  private ServletContext context;



  public void init(FilterConfig fConfig) throws ServletException {

    LOGGER.info("init ... ResponseChangeFilter");

    this.context = fConfig.getServletContext();

    this.context.log("ResponseChangeFilter initialized");

  }



  public void doFilter(ServletRequest request, ServletResponse response,

      FilterChain chain) throws IOException, ServletException {

    LOGGER.info("doFilter ... ResponseChangeFilter BEFORE filter");



    HttpServletResponse httpServletResponse =((HttpServletResponse) response);

    httpServletResponse.setHeader("foo", "bar");

    chain.doFilter(request, httpServletResponse);



    LOGGER.info("AFTER filter, original response: " );

  }



  public void destroy() {

    // we can close resources here

    LOGGER.info("destroy ... RequestParameterChangeFilter");

  }



}



<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">


<title>My JSP 'result.jsp' starting page</title>


<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

</head>

<body>

	<br>

	<br>

	<form action="HeaderServlet" method="POST" id='test'>

		<fieldset>

			<legend> Welcome to the Header Servlet project... Page 1</legend>


			<table align="center">

				<tr>

					<td align="right"><input type="submit" value="Submit" /></td>

				</tr>

			</table>

		</fieldset>

	</form>

</body>

</html>





<%@ page import="java.util.*"%>

<html>

<body>

	<h2 align="center">Headers Information Servlet !!!</h2>

	<p>

		<%

  Enumeration<String> headers = request.getHeaderNames();

  

  while(headers.hasMoreElements()) {

  out.print("<br>header:" + request.getHeader(headers.nextElement()));

  }

  

  %>
	

</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>ServletDefaultHeadersInfoProject</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.filter.response</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>HeaderServlet</servlet-name>
		<servlet-class>com.cv.servlet.header.HeaderServlet</servlet-class>
			<init-param>
			<param-name>n1</param-name>
			<param-value> 100 </param-value>
		</init-param>

         <init-param>
			<param-name>n2</param-name>
			<param-value> 200 </param-value>
		</init-param>
	</servlet>

	<servlet-mapping>
		<servlet-name>HeaderServlet</servlet-name>
		<url-pattern>/HeaderServlet</url-pattern>
	</servlet-mapping>
	<filter>
		<filter-name>TestFilter</filter-name>
		<filter-class>com.cv.servlet.header.ResponseChangeFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>TestFilter</filter-name>
		<url-pattern>/HeaderServlet</url-pattern>
	</filter-mapping>
	
	<welcome-file-list>
		<welcome-file>first.jsp</welcome-file>
	</welcome-file-list>
	
</web-app>













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