Java by examples

Before we start tutorial about creating cookie free or cookie less domain in java. You'll need to setup sub domain. To setup sub domain in java + tomcat7 read the article : http://www.javaquery.com/2013/05/how-to-configure-subdomain-in-tomcat-7.html

Why should i create cookie free or cookie less sub domain for static content? 
    Below image helps you to understand the real time scenario. Lets say you set your cookie's domain ".domain.com". Browser use this cookies when you request content from static.domain.com and creates network traffic. Read more about cookie free domain : http://developer.yahoo.com/performance/rules.html#cookie_free

Cookies

Solution: To get over this problem you must set domain of cookie like www.domain.com .We can forcefully insert www in URL. If URL contains www then cookies will created for domain "www.domain.com".

Scenario: I'll demonstrate the example where i forcefully insert WWW for home page. So on each login cookies create only for www.domain.com . I'll also demonstrate URL redirect when there is request for webpage don't have WWW in URL (i.e: http://domain.com/message/view.jsp?id=125) and request for cookies.

Insert below code in your index.jsp (i.e: home page) at the start of the page.

// index.jsp
    String referer = request.getParameter("url");

    if (referer == null && !request.getHeader("host").contains("www")) {
        response.sendRedirect("http://www.domain.com");
    } else if (referer!=null && !referer.equals("index.jsp") && (referer.indexOf("www")<0 referer.indexof="" www="">10)) {
        referer = referer.substring(referer.indexOf("//") + 2, referer.length());
        referer = "http://www." + referer;
        response.sendRedirect(referer);
    }

We use the else if code when there is a request come for other page except home page (i.e: http://domain.com/message/view.jsp?id=125). So...

Now we must check each page's URL for WWW in it. Insert below code in every page or create one checkURL.jsp page and include it in every page.

        boolean login = true;
        ...
        ...
        /* Read cookies for www.domain.com
         * if you can read it then okay but you can't then set login = false;
         * It'll be redirected to index.jsp and insert WWW in its URL and redirect to that page again.
         */
        if(!login){ 
        StringBuffer requestURL = request.getRequestURL();
        if (request.getQueryString() != null) {
            requestURL.append("?").append(request.getQueryString());
        }
        String completeURL = requestURL.toString();
        response.sendRedirect("index.jsp?url="+completeURL);
        }

Lets consider you want to insert www in url forcefully for certain reasons. Its easy task you can handle by simple script that I'm gonna give you. Keep in mind you need to change the below code for your domain as per your need.

Scenario: I'm considering the home page domain.com will be redirected to www.domain.com . If you want your page domain.com/forum/view.jsp?thread=124 will be redirect to www.domain.com/forum/view.jsp?thread=124 then you must add this code to every page. Simple idea is make checkURL.jsp and paste the code in this page and include checkURL.jsp in every page.

    StringBuffer requestURL = request.getRequestURL();
    if (request.getQueryString() != null) {
         requestURL.append("?").append(request.getQueryString());
    }
    String completeURL = requestURL.toString();

    if (completeURL.indexOf("www")<0 || completeURL.indexOf("www")>10) {
        String referer = completeURL.substring(referer.indexOf("//") + 2, referer.length());
        referer = "http://www." + referer;
        response.sendRedirect(referer);
    } 

• Configure subdomain in apache tomcat 7.
• Configuring Virtual Hosts.
• Configure subdomain in server.xml
• Configure subdomain in DNS.
• Configure subdomain for java.
• Configure subdomain step by step.
• Configure subdomain on www.eatj.com 

<Host appbase="webapps/ROOT/m" autodeploy="true" name="m.domain.com" unpackwars="true" xmlnamespaceaware="false" xmlvalidation="false">
<Context docbase="/usr/local/software/tomcat7/webapps/ROOT/m" path="" reloadable="true"></Context>
<Context antijarlocking="false" antiresourcelocking="false" docbase="/usr/local/software/tomcat7/webapps/manager" path="/manager" privileged="true" reloadable="true"></Context>
</Host>

• appbase : If you have folder where webapps folder is created then appbase will be just m . If folder is with in webapps then appbase will be webapps/m and so on...
• name : change it with your domain name.
• docbase in first context : Set the location of your folder with absolute path.
• Second context : You can remove if you want or set it the the manager folder for your application.

• Go to List zones.
• Edit your zones.
• Add record.
• Provide name m.domain.com
• Set Type to A
• Set Content to your Server IP Address.
• Set TTL as per your want or 86400.

/*
* javaQueryAPI 7.0 or less
*/
import javaQuery.j2ee.EmbedVideo;
public class Video {
    public static void main(String[] args) {
        String WebVideo = "";
        EmbedVideo em = new EmbedVideo();
        boolean flag = em.EmbedVideo("http://www.youtube.com/watch?v=0N9JxHEoYd4");
        //flag will return true if website/link contains video details in proper format.
        if (flag) {
            System.out.println(EmbedVideo.provider_name);
            System.out.println(EmbedVideo.provider_url);
            System.out.println(EmbedVideo.author_name);
            System.out.println(EmbedVideo.author_url);
            System.out.println(EmbedVideo.title);
            System.out.println(EmbedVideo.description);
            System.out.println(EmbedVideo.html);
            System.out.println(EmbedVideo.width);
            System.out.println(EmbedVideo.height);
            System.out.println(EmbedVideo.thumbnail_url);
            System.out.println(EmbedVideo.video_url);
            System.out.println(EmbedVideo.xml_type);

            WebVideo = "Author:"+EmbedVideo.author_name;
            //Modify the Data as per your requirement like place the video in iframe
        }
    }
}

/*
* javaQueryAPI 8.0 or above
* This code requires additional JSON library. You must include JSON lib to work this API. Its available in javaQueryAPI 8.0/lib folder on sourceforge.net
*/
import javaQuery.importClass.javaQueryBundle;
import javaQuery.j2ee.embedvideo;

public class Demo {
    public static void main(String[] args) {
        embedvideo em = javaQueryBundle.create_embedvideo();
        em.linkTo("http://www.youtube.com/watch?v=SmM0653YvXU");
        System.out.println(em.title);
        System.out.println(em.video_url);
        System.out.println(em.description);
        System.out.println(em.width);
        System.out.println(em.height);
        System.out.println(em.thumbnail_url);
        System.out.println(em.author_name);
        System.out.println(em.author_url);
        System.out.println(em.html);
        System.out.println(em.provider_name);
        System.out.println(em.provider_url);        
    }
}
/*
* output
* Pitbull - Rain Over Me ft. Marc Anthony
* http://www.youtube.com/watch?v=SmM0653YvXU
* Not Available
* 480
* 270
* http://i4.ytimg.com/vi/SmM0653YvXU/hqdefault.jpg
* PitbullVEVO
* http://www.youtube.com/user/PitbullVEVO
* <iframe allowfullscreen="" frameborder="0" height="270" src="http://www.youtube.com/embed/SmM0653YvXU?feature=oembed" width="480"></iframe>
* YouTube
* http://www.youtube.com/
*/

• How to speed up site?
• How to load site faster?
• How to make Java, JSP, Servlet site fast?

I'll give you some tips to do it and you can see the effect its loading way much faster. Some content you ignored but it really matters when user have slow connection speed. Let me show how you made your site and its old idea to do it. Your site currently having this scenario as below.
This is how your site works if you didn't optimized it. Now we'll see how you can optimize if you didn't. Check your site grade using Yslow http://developer.yahoo.com/yslow/ We'll do optimization and after that check your grade you'll see it increased.

Compress StyleSheet, javaScripts
You must compress content to make response faster. So it'll take less time to load. Removing whitespace, unwanted semi colons from the StyleeSheet, javaScript. Use the below online tool to compress it

• StyleeSheet (CSS) - Tool compress css and give you compressed CSS. Compress CSS in .css file as well as data between <style></style>
• Tool : http://www.csscompressor.com/
• Note: This tool compress CSS but some time it made changes according standard CSS rules. If you made any tricks in CSS it'll be omitted. After compression test your CSS and make changes again  for tricky CSS

• javaScrips (JS) - Tool compress js and give you compressed JS. Compress JS in .js file as well as data beetween <script></script>
• Tool: http://closure-compiler.appspot.com/home

Note : Place StyleSheet at the TOP and javaScript before the </body>.

Compress images, Don't scale it.
Compress images using some software, or online so it load faster on client side. Below some sites that helps you to convert and compress images. Secondly don't scale images say image 128x128 and you try to show as a 30x30. Better to make that image 30x30 rather then showing 128x128 image using width = 30.

• .png : http://images.my-addr.com/resize_png_online_tool-free_png_resizer_for_web.php
• .jpg : imageoptimizer.net

Combine static images
Combine all static png images. Say if you have menubar icons so combining all images in one will reduce http requests. http://csssprites.com/

Remove Buffer

This is also required to flush the buffer. Put the below code between </head> <body> <% response.flushBuffer();%>

Few HTTP request

Combine all scripts in one file so it makes less parallel HTTP request. Say browser loads data after DNS look up(Domain Validation). So if you use multiple domain (image, script, etc... from other site) then it make DNS look up for every site. Try to minimize the HTTP request.Make HTTP request between 2-4 if possible. 

Set expire header for the content important task.

Browser it self store data in cache. But if you store data with out expiry. It'll load images, javascripts, stylesheets, etc... any time. Store data with proper expiry so it'll refresh data at that time only. All site have some static content like logo, menu image, script, stylesheet. Store this data at the client side so browse each time use data from cache. Browser doesn't make request for that data on server so server has to response less data. I'll show how you can do it.

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.http.HttpServletResponse;

public class cacheControl implements javax.servlet.Filter {
    FilterConfig filterConfig = null;

    public void init(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }
    public void doFilter(ServletRequest req,
            ServletResponse res,
            FilterChain chain)
            throws IOException, ServletException {
        String sCache = filterConfig.getInitParameter("cache");

        if (sCache != null) {
            ((HttpServletResponse) res).setHeader("Cache-Control", sCache);
        }
        chain.doFilter(req, res);
    }
    public void destroy() {
        this.filterConfig = null;
    }
}

Create servlet using above code. Make an entry in web.xml if you are not using some IDE. Now set filer for what you want to set expiry header. Like *.css, *.js, *.png, etc....Copy paste the below code in web.xml . *.css, *.js, means every css from your domain, Below code have max-age=250000 mean it'll store data round about two days. You can also append *.png, *.jpg, etc... create proper filter.

<filter>
        <filter-name>Cache</filter-name>
        <filter-class>alien.config.cacheControl</filter-class>
        <init-param>
            <param-name>cache</param-name>
            <param-value>public, max-age=250000</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>Cache</filter-name>
        <url-pattern>*.css</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>Cache</filter-name>
        <url-pattern>*.js</url-pattern>
    </filter-mapping>

compression="on"
compressionMinSize="2048"
noCompressionUserAgents="gozilla, traviata"
compressableMimeType="text/html,text/xml,text/plain,text/javascript,text/css"

<Connector URIEncoding="utf-8" connectionTimeout="20000" port="8084" protocol="HTTP/1.1" redirectPort="8443" compression="on" compressionMinSize="2048" noCompressionUserAgents="gozilla, traviata" compressableMimeType="text/html,text/xml,text/plain,text/javascript,text/css"/>

• commons-io-2.0.jar ( http://commons.apache.org/io/download_io.cgi )
• commons-fileupload-1.2.2.jar ( http://commons.apache.org/fileupload/download_fileupload.cgi )

import bean.setNotification;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;

List fileItemsList = null;
float filesize = 0;
String _fileLink;
String _fileName = null;
String _uploadDir = getServletContext().getRealPath("/upload/");
//Change upload with your directory
HttpSession session = request.getSession(true);
try {
 if (ServletFileUpload.isMultipartContent(request)) {
 ServletFileUpload servletFileUpload = new ServletFileUpload(new DiskFileItemFactory());
       try {
        fileItemsList = servletFileUpload.parseRequest(request);
       } catch (FileUploadException ex) {
        Logger.getLogger(FileUploadExample.class.getName()).log(Level.SEVERE, null, ex);
        //Change above line replace FileUploadExample with your file name
           }
           String optionalFileName = "";
           FileItem fileItem = null;

           Iterator it = fileItemsList.iterator();
           while (it.hasNext()) {
           FileItem fileItemTemp = (FileItem) it.next();
            if (fileItemTemp.isFormField()) {
               if (fileItemTemp.getFieldName().equals("filename")) {
                  optionalFileName = fileItemTemp.getString();
               }
             /*
             * If you want to pass some other data from JSP page. You can access then in this way.
             * For each field you have do create if like below.
             * if (fileItemTemp.getFieldName().equals("Name of other field like:Firstname")) {
             * String Firstname = fileItemTemp.getString();
             * }
             */
            } else {
                  fileItem = fileItemTemp;
            }
         }
         if (fileItem != null) {
           long size_long = fileItem.getSize();
           filesize = size_long / 1024;
           filesize = filesize / 1000;
           //If you want to limit the file size. Here 30MB file size is allowed you can change it
           if (filesize > 30.0) {
           //Pass error message in session.
           setNotification _sN = new setNotification();
           _sN.setError("File size can't be more than 30MB");
           session.setAttribute("error", _sN);
           } else {
           _fileName = fileItem.getName();
           if (fileItem.getSize() > 0) {
              if (optionalFileName.trim().equals("")) {
                _fileName = FilenameUtils.getName(_fileName);
              } else {
                _fileName = optionalFileName;
              }
               _fileLink = "../upload/" + _fileName;
               try {
                File file = new File(new File(_uploadDir + "/"), fileItem.getName());
                fileItem.write(file);
               } catch (Exception e) {
                e.printStackTrace();
               }
               setNotification _sN = new setNotification();
               _sN.setError("File Uploaded to : " + _fileLink + "");
               session.setAttribute("error", _sN);
                }
               }
              }
             String referer = request.getHeader("Referer");
            response.sendRedirect(referer);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            out.close();
        }

public class setNotification {
    private String Error="";
    public String getError() {
        return Error;
    }
    public void setError(String Error) {
        this.Error = Error;
    }
}

<%@page import="bean.setNotification"%>
<%
            setNotification _sN = new setNotification();
            if (session.getAttribute("error") != null) {
                _sN = (setNotification) session.getAttribute("error");
            }

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!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>File Upload Example</title>
        <link type="text/css" href="css/bundle.css" rel="StyleSheet"/>
    </head>
    <body>
        <center>
            <div class="signal_box" style="width: 400px;height: 150px">
                <div class="head">File Upload - javaQuery.com</div>
                <form action="FileUploadExample" method="post"  enctype="multipart/form-data">
                <input type="file" name="myFile"/><br/>
                <input type="submit" value="Upload it"/>
                </form>
                <br/>
                <%=_sN.getError()%>
                <%_sN.setError("");%>
            </div>
        </center>
    </body>
</html>

• I know you tried "request.getRemoteAddr()" but its not working and give you 127.0.0.1 as an output.

request.getHeader("VIA");
String ipAddress = request.getHeader("X-FORWARDED-FOR");
       if (ipAddress == null) {
            ipAddress = request.getRemoteAddr();
       }

/*
* javaQueryAPI 7.0 or less
*/
import javaQuery.j2ee.GeoLocation
request.getHeader("VIA");
String ipAddress = request.getHeader("X-FORWARDED-FOR");
       if (ipAddress == null) {
            ipAddress = request.getRemoteAddr();
       }
GeoLocation gl = new GeoLocation();
gl.GetGeoLocationByIP(ipAddress);
String country = gl.Country;

/*
* javaQueryAPI 8.0 or above
*/
import javaQuery.importClass.javaQueryBundle;
import javaQuery.j2ee.GeoLocation;

request.getHeader("VIA");
String ipAddress = request.getHeader("X-FORWARDED-FOR");
       if (ipAddress == null) {
            ipAddress = request.getRemoteAddr();
       }
        GeoLocation $gl = javaQueryBundle.createGeoLocation();
        $gl.MAPTargetByIP("117.204.232.104", "This is Demo. You can set even NULL");
        System.out.println($gl.Latitude);
        System.out.println($gl.Longitude);
        System.out.println($gl.Country);
        System.out.println($gl.City);
        System.out.println($gl.State);
        System.out.println($gl.GoogleMap_URL);
        System.out.println($gl.GoogleMap_URL_Bubble);
   
/*
* output
* 23.0333
* 72.616699
* India
* Ahmedabad
* Gujarat
* http://maps.google.com/maps?q=23.0333,+72.616699+(117.204.232.104)&iwloc=A&hl=en
* http://maps.google.com/maps?q=23.0333,+72.616699+(This is Demo. You can set even NULL)&iwloc=A&hl=en
*/