configure ssl for apache tomcat in EC2 server

To launch an AWS/EC2 instance, at first setting up a security group to specify what network traffic is allowed to reach the instance. Then select an AMI and launch an instance from it. And create a volume in the same zone of the instance and attach with it. Format the device and mount it to a directory. After that follow the steps to create SSL for Tomcat: (If any of this command say permission denied , then try to execute command with sudo)

1. For the tomcat we need java, so create a directory to save the Java Binary file.

mkdir /usr/java
cd /usr/java

2. Download jdk binary file (jdk-x-linux-ix.bin) here

Use URL http://www.oracle.com/technetwork/java/archive-139210.html
3. Execute the Binary file

/usr/java/jdk-x-linux-ix.bin


Now we have the Java in our device. Then Download the Tomcat and install it followed by the instructions:-


1. Create a directory to save the tomcat

mkdir /usr/tomcat
cd /usr/tomcat


2. Download tomcat source file (apache-tomcat-x.tar.gz) here 

Use URL http://apache.hoxt.com/tomcat/tomcat-6/v6.0.32/bin/


3. Extract that file

tar -zxvf apache-tomcat-x.tar.gz


4. Edit the catalina.sh file

vim /usr/tomcat/apache-tomcat-x/bin/catalina.sh

#** Add at the top **

JAVA_HOME=/usr/java/jdk1.x.x_x

save and exit


5. Start the tomcat

/usr/tomcat/apache-tomcat-x/bin/startup.sh


6. We can see the logs by using the given command

tail -f /usr/tomcat/apache-tomcat-x/logs/catalina.out


7. Take the browser and enter the URL http://localhost

Now we can see the tomcat index page


8. To stop the tomcat

/usr/tomcat/apache-tomcat-x/bin/shutdown.sh


Now configure the SSL Certificate for tomcat. When you choose to activate SSL on your web server you will be prompted to complete a number of questions about the identity of your website and your company. Your web server then creates two cryptographic keys – a Private Key and a Public Key. The Public Key does not need to be secret and is placed into a Certificate Signing Request (CSR) – a data file also containing your details.
 
Create a self signed certificate authority (CA) and keystore.

1. Make a directory to hold the certs and keystore. This might be something like:

mkdir /usr/tomcat/ssl
cd /usr/tomcat/ssl


2. Generate a private key for the server and remember it for the next steps

openssl genrsa -des3 -out server.key 1024

Generating RSA private key, 1024 bit long modulus

…………………..++++++

…++++++

e is 65537 (0×10001)

Enter pass phrase for server.key:

Verifying – Enter pass phrase for server.key:


3. Generate a CSR (Certificate Signing Request). Give the data after executing this command

openssl req -new -key server.key -out server.csr


Enter pass phrase for server.key:

You are about to be asked to enter information that will be incorporated

into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN.

There are quite a few fields but you can leave some blank

For some fields there will be a default value,

If you enter ‘.’, the field will be left blank.

—–

Country Name (2 letter code) [GB]:

State or Province Name (full name) [Berkshire]:

Locality Name (eg, city) [Newbury]:

Organization Name (eg, company) [My Company Ltd]:

Organizational Unit Name (eg, section) []:

Common Name (eg, your name or your server’s hostname) []:

Email Address []:

Please enter the following ‘extra’ attributes

to be sent with your certificate request

A challenge password []:

An optional company name []:


4. Remove the passphrasse from the key

cp server.key server.key.org

openssl rsa -in server.key.org -out server.key

Enter pass phrase for server.key.org:

writing RSA key


5. Generate the self signed certificate

openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

Signature ok

subject=/C=GB/ST=Berkshire/L=Newbury/O=My Company Ltd

Getting Private key

You should then submit the CSR. During the SSL Certificate application process, the Certification Authority will validate your details and issue an SSL Certificate containing your details and allowing you to use SSL. Typically an SSL Certificate will contain your domain name, your company name, your address, your city, your state and your country. It will also contain the expiration date of the Certificate and details of the Certification Authority responsible for the issuance of the Certificate.

Create a certificate for tomcat and add both to the keystore

1. Change the path to ssl

cd /usr/tomcat/ssl


2. Create a keypair for ‘tomcat’


keytool -genkey -alias tom -keyalg RSA -keystore tom.ks


Enter keystore password:

Re-enter new password:

What is your first and last name?

[Unknown]:

What is the name of your organizational unit?

[Unknown]:

What is the name of your organization?

[Unknown]:

What is the name of your City or Locality?

[Unknown]:

What is the name of your State or Province?

[Unknown]:

What is the two-letter country code for this unit?

[Unknown]:

Is CN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown correct?

[no]: yes

Enter key password for <tom>

(RETURN if same as keystore password):

Re-enter new password:


3. Generate a CSR (Certificate Signing Request) for tomcat

keytool -keystore tom.ks -alias tom -certreq -file tom.csr

Enter keystore password:

4. create unique serial number


echo 02 > serial.txt
(If this say permission denied then, mkfile call serial.txt and chmod of it -> then try)


5. Sign the tomcat CSR


openssl x509 -CA server.crt -CAkey server.key -CAserial serial.txt -req -in tom.csr -out tom.cer -days 365


Signature ok

subject=/C=Unknown/ST=Unknown/L=Unknown/O=Unknown/OU=Unknown/CN=Unknown

Getting CA Private Key


6. Import the server CA certificate into the keystore

keytool -import -alias serverCA -file server.crt -keystore tom.ks


Enter keystore password:

Owner: O=My Company Ltd, L=Newbury, ST=Berkshire, C=GB

Issuer: O=My Company Ltd, L=Newbury, ST=Berkshire, C=GB

Serial number: ee13c90cb351968b

Valid from: Thu May 19 02:12:51 EDT 2011 until: Fri May 18 02:12:51 EDT 2012

Certificate fingerprints:

MD5: EE:F0:69:01:4D:D2:DA:A2:4E:88:EF:DC:A8:3F:A9:00

SHA1: 47:97:72:EF:30:02:F7:82:BE:CD:CA:F5:CE:4E:ED:89:73:23:4E:24

Signature algorithm name: SHA1withRSA

Version: 1

Trust this certificate? [no]: yes

Certificate was added to keystore


7. Add the tomcat certificate to the keystore

keytool -import -alias tom -file tom.cer -keystore tom.ks


Enter keystore password:

Certificate reply was installed in keystore

To configure a secure (SSL) HTTP connector for Tomcat, verify that it is activated in the $TOMCAT_HOME/conf/server.xml file. Edit this file and add the following lines.


Tomcat configuration

1. Edit the given portion of tomcat configuretion file and change the port as 80


vim /usr/tomcat/apache-tomcat-6.0.13/conf/server.xml

“””””” <Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" /> “”””””



<Connector port="80" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />


2. Add the given portion to server.xml and give your password in the password portion


<Connector port="443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
keystoreFile="tom.ks"
keystorePass="password"
clientAuth="false" sslProtocol="TLS" />


When you start the Tomcat Your web server will match your issued SSL Certificate to your Private Key. Your web server will then be able to establish an encrypted link between the website and your customer’s web browser.

Start the tomcat with SSL Certificate


1. Restart tomcat


/usr/tomcat/apache-tomcat-6.0.13/bin/shutdown.sh


/usr/tomcat/apache-tomcat-6.0.13/bin/startup.sh


2. Go to https://Public DNS name:443/

Then your browser shows a security issue. Click the Approve button. Then you can enter to the tomcat with your certificate. When a browser connects to a secure site it will retrieve the site’s SSL Certificate and check that it has not expired, it has been issued by a Certification Authority the browser trusts, and that it is being used by the website for which it has been issued. If it fails on any one of these checks the browser will display a warning to the end user letting them know that the site is not secured by SSL.

You are Done !!!




Refer from: http://www.migrate2cloud.com/blog/ssl-for-tomcat-on-awsec2

How to convert String to Java.sql.date and Java.sql.time

 DateFormat DOB = new SimpleDateFormat("yyyy-MM-dd");
    String date ="\"1234-01-01\"";
    java.sql.Date convertedDate=null;
    try {
        convertedDate = new java.sql.Date(DOB.parse(date.replaceAll("\"","")).getTime());
    } catch (ParseException ex) {
        ex.printStackTrace();
    }
    System.out.println(convertedDate);

split a String by * in java

Let say we have a String something like below.

String sample="abc*123";

We want to split this String by '*'. We can't do this directly.Because in split the * has a special meaning.

This not working,
String spl[]=sample.split("*");

Therefore, we should use something like below.

String spl[]=sample.split("\\*");

execute batch of queries in one time using java and JDBC

Let say we have something like below.

String [] queries = {

    "insert into employee (name, city, phone) values ('A', 'X', '123')",

    "insert into employee (name, city, phone) values ('B', 'Y', '234')",

    "insert into employee (name, city, phone) values ('C', 'Z', '345')",

};

             

Connection connection = new getConnection();

Statement statemenet = connection.createStatement();

             

for (String query : queries) {

    statemenet.execute(query); //execute query one by one

}

statemenet.close();

connection.close();

 

Execute all the queries one by one.This is not a good practice.We can use something like below.Execute all the queries in once.

 

 

 

Connection connection = new getConnection();

Statement statemenet = connection.createStatement();

 

for (String query : queries) {

    statemenet.addBatch(query);

}

statemenet.executeBatch();

statemenet.close();

connection.close();

 

 

 

 

As well as we can avoid sql injection by using something like below.

 

String sql = "insert into employee (name, city, phone) values (?, ?, ?)";

Connection connection = new getConnection();

PreparedStatement ps = connection.prepareStatement(sql);

 

final int batchSize = 1000;

int count = 0;

 

for (Employee employee: employees) {

 

    ps.setString(1, employee.getName());

    ps.setString(2, employee.getCity());

    ps.setString(3, employee.getPhone());

    ps.addBatch();

     

    if(++count % batchSize == 0) {

        ps.executeBatch();

    }

}

ps.executeBatch(); // insert remaining records

ps.close();

connection.close();

 

 

 

Files on flash drive changed to shortcuts fix

If you did not format your flash drive, then check whether the files are in hidden mode. Then follow these steps:

• Click on the link below and download the file "AutorunExterminator":
  • http://en.kioskea.net/download/download-11613-autorun-exterminator
• Extract it: Double-click on "AutorunExterminator"
• Plug your pendrive now
  • This will remove the autorun.inf files from your pendrive and also from the drives
• Click on Start > Run, type cmd and click OK
• Here it is assumed your pendrive letter is G (change as necessary)
• Enter this command.

  • attrib -h -r -s /s /d g:\*.*      

• Press Enter
• Now check for your files in on the pen drive
• Now download the Malwarebytes' Anti-Malware from this link:http://en.kioskea.net/download/download-105-malwarebytes-anti-malware
• Update it and perform a "Full Scan"
  • Note : The default selected option is "Quick Scan"

Configure CAS SSO with mysql database

When i try to configure mysql with CAS There were lots of problem occurred and i cannot find a good tutorials about this.I followed some tutorials but i failed.Finally i found the way.So i decided to write a post about it.I explain this in localhost


Prerequest

Install mysql on the machine and be sure it's working properly.I used the default settings of mysql.If you used different one, change the configuration according to it.(localhost:3306)

Download apache tomcat and configure it to allow SSL connection.( You can follow my previous post)

Download cas server source code package

Install apache maven


How

• Go to CAS source code location -> cas-server-webapp ->src->main->webapp->WEB-INF

• Open deployerConfigContext.xml in a text editor

• Change the bean serviceRegistryDao in deployerConfigContext.xml to something like this

<bean id="serviceRegistryDao" class="org.jasig.cas.services.JpaServiceRegistryDaoImpl"

   p:entityManagerFactory-ref="entityManagerFactory" />

 

<!-- This is the EntityManagerFactory configuration for Hibernate -->

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">

        <property name="dataSource" ref="dataSource"/>

        <property name="jpaVendorAdapter">

            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">

                <property name="generateDdl" value="true"/>

                <property name="showSql" value="true" />

            </bean>

        </property>

        <property name="jpaProperties">

            <props>

                <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>

                <prop key="hibernate.hbm2ddl.auto">update</prop>

            </props>

        </property>

    </bean>

 

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">

        <property name="entityManagerFactory" ref="entityManagerFactory"/>

    </bean>

 

    <tx:annotation-driven transaction-manager="transactionManager"/>

 

   

<!-- change test as your database name, and give username and password of mysql login credential-->
<bean
        id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource"
        p:driverClassName="com.mysql.jdbc.Driver"
        p:url="jdbc:mysql://localhost:3306/test?autoReconnect=true"
        p:password=""
        p:username="root" />

• Change following line

<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>

• Open cas.properties file

database.hibernate.dialect=org.hibernate.dialect.MySQLDialect

• Go to CAS source code location -> cas-server-webapp
• Open pom.xml and add following dependency according to your CAS version

<!--

    Apache Commons DBCP

      for Java 6 (use version 1.3 for Java 5 or lower)

-->

<dependency>

    <groupId>commons-dbcp</groupId>

    <artifactId>commons-dbcp</artifactId>

    <version>1.4</version>

    <scope>runtime</scope>

</dependency>

 

<!--

    Hibernate Core and Entity Manager

      for CAS 3.5.0 and higher

-->

<dependency>

    <groupId>org.hibernate</groupId>

    <artifactId>hibernate-core</artifactId>

    <scope>compile</scope>

</dependency>

 

<dependency>

    <groupId>org.hibernate</groupId>

    <artifactId>hibernate-entitymanager</artifactId>

</dependency>

 

<!--

    Hibernate Entity Manager

      for CAS 3.4.2.1

-->

<dependency>

    <groupId>org.hibernate</groupId>

    <artifactId>hibernate-entitymanager</artifactId>

    <version>3.5.0-CR-2</version>

</dependency>

 

<!-- 

    MySQL Connector

-->

<dependency>

    <groupId>mysql</groupId>

    <artifactId>mysql-connector-java</artifactId>

    <version>5.1.20</version>

</dependency>

 

Configure tomcat for SSL protocol

In this post i will show you how to configure tomcat 7.x for SSL protocol in windows

First we want to generate certificate file using java keytool

1. Open command prompt and go to bin folder of java installation

• CD %JAVA_HOME%\bin

2. type following commands (i used my password as abcd@1234 (This is called keystore password).Please       use your own)

• D:\Program Files\Java\jdk1.6.0\bin>keytool -delete -alias tomcat -keypass abcd@1234        

      Use alias as tomcat.There will be generate .keystore which is hold your key inside C:\key. Please make
      sure there will be a directory called C:\key before type following command ( you can use your own
      directory as well). You will be ask some questions.Please give as localhost when asking Your first 
      and Last Name( Here we give as localhost because we configure it in local machine.If you are           configure tomcat in a server, Then you have to give the server name.For an example: If application hosting @ www.myapp.com then you have to use myapp as the Your First and Last Name).Others can be answered as you want.Type same password you use as
      keystore password.Other wise there will be some error occurred when running tomcat.

• D:\Program Files\Java\jdk1.6.0\bin>keytool -genkey -alias tomcat -keyalg RSA -keystore c:/key/.keystore

      Type following commands as it is.( Change passwords and locations  you use as keystore password
      and .keystore file generated

• keytool -export -alias tomcat -keypass abcd@1234 -file server.crt -keystore c:/key/.keystore
• keytool -import -file server.crt -keypass abcd@1234 -keystore ..\jre\lib\security\cacerts

Now you having .keystore file inside c:\key (if you use the same location as tutorial) and file called cacerts %JAVA_HOME\jre\security . If you have those files that mean you are successfully generate certificate file.

Now lets configure tomcat

1. Go to tomcat install location and go to conf folder (in my case D:\tomcat\conf)

2. Open server.xml file in your favorite text editor

3. Find the commented line and comment out it

Before

<!--
    <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
               maxThreads="150" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

After


 <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
               maxThreads="150" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />


4. Add the following lines in to that and change the bolded lines according to your configurations


<Connector port="8443" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75"  enableLookups="false" disableUploadTimeout="true"
acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS"
keystoreFile="C:\Users\madura\Documents\.keystore"
keystorePass="abcd@1234"
truststoreFile="D:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.22\security\cacerts" 
SSLEnabled="true" protocol="org.apache.coyote.http11.Http11NioProtocol"/>

Now it is time t test this.

• Open command prompt and go to %CATALINA_HOME%\bin
• Type catalina.bat start   (tomcat server will start now)
• Open a web browser and type https://localhost:8443 (If the configurations are ok , you will see the official tomcat server page

Congratulations.....

If not success  please go to from the begining..

How to install tomcat in windows

In tnis tutorial i will explain how configure apache tomcat 7.x for SSL protocol (https://)
I used apache tomcat 7.xx for my configuration

1. download apache tomcat fresh copy from the official web site and extract it some location in your hard disk( i used D:/tomcat)

2. Right click on MyComputer and click on properties-> Advaced System Settings -> Environment Variables (in Advanced Tab)

3. Click on the New button in System variables and add Variable Name as CATALINA_HOME
Variable Value as tomcat installation location (in my case D:/tomcat)

Then click on OK

4. Find the path variable in system variable -> Click on Edit and add the ; at end of the value. Then append it to path to bin folder of tomcat (in my case D:/tomcat/bin). Click OK and exit

Now You are install tomcat in windows successfully.Then test the installation as below.

* Open command prompt
* go to tomcat install location/bin

•  D:
• cd %CATALINA_HOME%
• cd bin

* type catalina.bat start

• There will be new window prompt and tomcat server may start

* open a web browser and go to link localhost:8080

• If tomcat installation successful , then official tomcat page will be loaded.

delete file using javascript

Only work with internet explorer

<script type="text/javascript">
    // initialize ActiveXObject and create an object of Scripting.FileSystemObject.
    var fso = new ActiveXObject("Scripting.FileSystemObject");

    fso.DeleteFile("C:\\Temp\\myFolder\\file.txt", true);

    // OR

    fso.DeleteFile("C:\\Temp\\myFolder\\*.txt", true);

    fso = null;
</script>

create file in local directory using javascript

This is only work with Internet explorer

<html>
<head>
<script language="javascript">
function WriteToFile()
{
var fso = new ActiveXObject("Scripting.FileSystemObject");
var s = fso.CreateTextFile("C:\\Test.txt", true);
s.WriteLine('Hello');
s.Close();
}
</script>
</head>
<body onLoad="WriteToFile()">

</body>
</html>

replace all html tags in a String using java

StringName.replaceAll("\\<.*?\\>", "").replaceAll("(?s)<!--.*?-->", "");

get data between two special character using java

Let say you want to get data between character ' and " of the below string

String str= 21*90'89"

You can do it really easy by using regular expression and java


Pattern pattern = Pattern.compile("'(.*?)\"");
Matcher matcher = pattern.matcher(str);
 if (matcher.find())
{
         System.out.println(matcher.group(1));
 }

get root element in xml using javascript

var xmlDoc= // DOM object
var root = xmlDoc.documentElement;

Google URL shortner

Your website url too long?
 Visit http://goo.gl/ and shorten it.It is a google service.

closing command prompt using java

import java.io.*;
import javax.swing.JOptionPane;
import java.net.BindException;
class Loader
{
    public static void main(String as[])
    {
        try
        {
            System.out.println("Loading application.........");

             //pass the name of your exe in place of my.exe
             Process p = Runtime.getRuntime().exec("my.exe");

             //getting inputstream reader from process
             BufferedReader reader = new BufferedReader
                                     (newInputStreamReader(p.getInputStream()));

             String line = reader.readLine();

              //exit from this class when get "Loaded" from your application
              while (line.equals("Loaded") == false)
               {
                       line = reader.readLine();
               }
                reader.close();
            }
            catch (Exception e)
            {
            }
    }
}

nice tutorial about how to create exe file using bat file

http://renegadetech.blogspot.com/2006/07/how-to-convert-bat-file-or-vbs-file.html

make shortcut for program using vbscript

L_Welcome_MsgBox_Message_Text = _
    "A shortcut to Notepad" & _
    vbcrlf & "will be created on your desktop."
 L_Welcome_MsgBox_Title_Text = _
    "Windows Scripting Host Sample"
 Call Welcome()
 Dim WSHShell
 Set WSHShell = _
    WScript.CreateObject("WScript.Shell")
 Dim MyShortcut, MyDesktop, DesktopPath
 ' Read desktop path using WshSpecialFolders object
 DesktopPath = _
    WSHShell.SpecialFolders("Desktop")
 ' Create a shortcut object on the desktop
 Set MyShortcut = _
    WSHShell.CreateShortcut( _
    DesktopPath & "\Shortcut to notepad.lnk")
 ' Set shortcut object properties and save it
 MyShortcut.TargetPath = _
    WSHShell.ExpandEnvironmentStrings( _
    "%windir%\notepad.exe")
 MyShortcut.WorkingDirectory = _
    WSHShell.ExpandEnvironmentStrings( _
    "%windir%")
 MyShortcut.WindowStyle = 4
 MyShortcut.IconLocation = _
    WSHShell.ExpandEnvironmentStrings( _
    "%windir%\notepad.exe, 0")
 MyShortcut.Save
 WScript.Echo _
    "A shortcut to Notepad now exists on your Desktop."
 Sub Welcome()
    Dim intDoIt
    intDoIt = MsgBox(L_Welcome_MsgBox_Message_Text, _
       vbOKCancel + vbInformation, _
       L_Welcome_MsgBox_Title_Text )
    If intDoIt = vbCancel Then
       WScript.Quit
    End If
 End Sub

Java Call main() method of a class using another class in java

public static void main(String[] args) throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
 
 Class<?> cls = Class.forName("pkg1.pkg2.classname");
   
Method meth = cls.getMethod("main", String[].class);
 
 String[] params = null; // init params accordingly
 
  meth.invoke(null, (Object) params); // static method doesn't have an instance
}

open url in current window using javascript

content.wrappedJSObject.location='http://www.somepage.com'

get substring using javascript

stringName.substring(from, to)

ex:

var mystr="hello";

alert(mystr.substring(0,2));

result:  "hel"

alert(mystr(2));

result: "llo"

get data of a cell in a table using javascript

go to required "td" tag (tdTag)
alert(tdTag.innerHTML);

xpath creater from node using javascript

function createXPathFromElement(elm) {
    var allNodes = document.getElementsByTagName('*');
    for (segs = []; elm && elm.nodeType == 1; elm = elm.parentNode)
    {
        if (elm.hasAttribute('id')) {
                var uniqueIdCount = 0;
                for (var n=0;n < allNodes.length;n++) {
                    if (allNodes[n].hasAttribute('id') && allNodes[n].id == elm.id) uniqueIdCount++;
                    if (uniqueIdCount > 1) break;
                };
                if ( uniqueIdCount == 1) {
                    segs.unshift('id("' + elm.getAttribute('id') + '")');
                    return segs.join('/');
                } else {
                    segs.unshift(elm.localName.toLowerCase() + '[@id="' + elm.getAttribute('id') + '"]');
                }
        } else if (elm.hasAttribute('class')) {
            segs.unshift(elm.localName.toLowerCase() + '[@class="' + elm.getAttribute('class') + '"]');
        } else {
            for (i = 1, sib = elm.previousSibling; sib; sib = sib.previousSibling) {
                if (sib.localName == elm.localName)  i++; };
                segs.unshift(elm.localName.toLowerCase() + '[' + i + ']');
        };
    };
    return segs.length ? '/' + segs.join('/') : null;
};

function lookupElementByXPath(path) {
    var evaluator = new XPathEvaluator();
    var result = evaluator.evaluate(path, document.documentElement, null,XPathResult.FIRST_ORDERED_NODE_TYPE, null);
    return  result.singleNodeValue;
}

remove directory using bat file

rmdir /s /q "C:\PGP Corporation" 

how to make a zip file using windows default zipping in bat file

This will create someArchive.zip file which included english.txt


 set FILETOZIP=c:\english.txt


    set TEMPDIR=C:\temp738
    rmdir %TEMPDIR%
    mkdir %TEMPDIR%
    copy %FILETOZIP% %TEMPDIR%

    echo Set objArgs = WScript.Arguments > _zipIt.vbs
    echo InputFolder = objArgs(0) >> _zipIt.vbs
    echo ZipFile = objArgs(1) >> _zipIt.vbs
    echo CreateObject("Scripting.FileSystemObject").CreateTextFile(ZipFile, True).Write "PK" ^& Chr(5) ^& Chr(6) ^& String(18, vbNullChar) >> _zipIt.vbs
    echo Set objShell = CreateObject("Shell.Application") >> _zipIt.vbs
    echo Set source = objShell.NameSpace(InputFolder).Items >> _zipIt.vbs
    echo objShell.NameSpace(ZipFile).CopyHere(source) >> _zipIt.vbs
    echo wScript.Sleep 2000 >> _zipIt.vbs

    CScript  _zipIt.vbs  %TEMPDIR%  C:\someArchive.zip

    pause

how set environment variable using bat file

You can set environment variable using bat file in two different ways.

method 1:
This method is temporary way.It will set environment variable while executing the bat file
let say i want set environment varable MY_HOME as my c://windows drive

set MY_HOME=c://windows


method 2:
This method will set the environment variable permanently to user environment variable category.That mean that variable only valid for that user account.This is use a vb script to set that environment variable.But no need to install vb on your machine.vbscript just like bat commands but different.

write the vb script name in bat file (in my case it's name is demo.vbs)

my bat file:


@echo OFF
demo.vbs


vb script: (in this case inside c://windows folder)

Set objShell = WScript.CreateObject("WScript.Shell")
Set colUsrEnvVars = objShell.Environment("USER")
Set fso = CreateObject("Scripting.FileSystemObject")
colUsrEnvVars("MY_HOME") = fso.GetParentFolderName(wscript.ScriptFullName) 

Remeber:  This vbscript should be in the directory c://windows folder.Because it's add the system variable as the path where it's included.

**remember to restart the machine after run this bat.

delete a file using java

This delete the file f1

File f1 = new File(file);
  boolean success = f1.delete();
  if (!success){
  System.out.println("Deletion failed.");
  System.exit(0);
  }else{
  System.out.println("File deleted.");
    }

Writing a DOM Document to an XML File

// This method writes a DOM document to a file
public static void writeXmlFile(Document doc, String filename) {
    try {
        // Prepare the DOM document for writing
        Source source = new DOMSource(doc);

        // Prepare the output file
        File file = new File(filename);
        Result result = new StreamResult(file);

        // Write the DOM document to the file
        Transformer xformer = TransformerFactory.newInstance().newTransformer();
        xformer.transform(source, result);
    } catch (TransformerConfigurationException e) {
    } catch (TransformerException e) {
    }
}

get an input from user using java popup

This will ask input from the user and store it in name variable

String name = JOptionPane.showInputDialog ( "String input text" ); 


demo:

open default web browser using java in widows

This method will open your default web browser in windows and open the url "www.google.lk"

String url="www.google.lk";  //add required url here
 try {
             String osName = System.getProperty("os.name");
                    if (osName.startsWith("Windows"))
                           Runtime.getRuntime().exec(
                                "rundll32 url.dll,FileProtocolHandler " + url);
} catch (Exception ex) {
}

java swing :Adding and Removing an Item in a JList Component

The default model for a list does not allow the addition and removal of items. The list must be created with a DefaultListModel.

// Create a list that allows adds and removes
DefaultListModel model = new DefaultListModel();
JList list = new JList(model);

// Initialize the list with items
String[] items = {"A", "B", "C", "D"};
for (int i=0; i<items.length; i++) {
    model.add(i, items[i]);
}

// Append an item
int pos = list.getModel().getSize();
model.add(pos, "E");

// Insert an item at the beginning
pos = 0;
model.add(pos, "a");

This method replaces an item:

// Replace the 2nd item 

pos = 1; 

model.set(pos, "b");

These methods are used to remove items:

// Remove the first item
pos = 0;
model.remove(pos);

// Remove the last item
pos = model.getSize()-1;
if (pos >= 0) {
    model.remove(pos);
}

// Remove all items
model.clear();


refferd from: 
http://www.exampledepot.com/egs/javax.swing/list_listaddrem.html

java swing : Getting the Selected Items in a JList Component

The following methods return the indices of the selected items:


// To create a list, see Creating a JList Component

// Get the index of all the selected items
int[] selectedIx = list.getSelectedIndices();

// Get all the selected items using the indices
for (int i=0; i<selectedIx.length; i++) {
    Object sel = list.getModel().getElementAt(selectedIx[i]);
}

// Get the index of the first selected item
int firstSelIx = list.getSelectedIndex();

// Get the index of the last selected item
int lastSelIx = list.getMaxSelectionIndex();

// Determine if the third item is selected
int index = 2;
boolean isSel = list.isSelectedIndex(index);

// Determine if there are any selected items
boolean anySelected = !list.isSelectionEmpty();

how to read xml file using java

This is a really good blog which explain clearly how to read xml file using java.

http://gardiary.wordpress.com/2011/03/10/read-xml-file-in-java-using-sax-parser/

what is firebug

        Firebug is a nice tool basically developed as firefox extension.Although it is a firefox extension now it also developed as a google chrome extension.Firebug using for debug the web applications.It is help to find the errors in web pages.It shows the html codes and other web page related stuff itself.So user can edit the code and see the results in real time.
     
        Many of web developers use this extension because of the easyness of usage.Also quality assurance people also use this to find element xpath and other related details for testing purposes.So it is really need to having some basic knowledge about this usefull tool.In this post i will give a basic introduction about it.

First of all let's install firebug in firefox.

1.Open firefox browser

2.Go to below link and click install firebug button
     http://getfirebug.com/

when install it some popup will come and ask to allow the program.So you have to allow it.After installing firefox asks to restart.So click restart to restart the firefox.

3.After firefox restarting, see the right hand bottom corner of the fire fox.you will see an icon like below.

4.click on that icon.Then firebug will open.

5.Open a any web page and click on the firebug icon.Then firebug window will open.After that right click on an any element of the web page and click inspect element option from the popup menu.

   Then all the details about that element will show in the firebug window.Such as element id,name etc..
Also you can edit the html code and see the changes in the webpage in real time.

This is only a basic introduction.If you really interest you can go through some tutorials in the internet.I hope to post another post about how to develop our own extension for firefox and firebug.

sony new phones

There are new phones will remove within next few weeks from sony.

Sony xperia tipo, sony xperia tipo dual

Sony xperia dual has dual sim facility with android 4.0. This is the first dual sim phone made by sony.

SPECIFICATIONS

for xperia tipo dual: http://www.sonymobile.com/global-en/products/phones/xperia-tipo-dual/ 

for xperia tipo: http://www.sonymobile.com/global-en/products/phones/xperia-tipo/specifications/#black

set java home using putty

set jdk home ("/opt/jdk_1.6/" is the path of java installation in server which i use)

export JAVA_HOME=/opt/jdk_1.6/

set jre home

export JRE_HOME=/opt/jdk_1.6/jre

get time stamp using java

class:

package com.mkyong.common;

import java.sql.Timestamp;
import java.util.Date;

public class GetCurrentTimeStamp
{
    public static void main( String[] args )
    {
java.util.Date date= new java.util.Date();
System.out.println(new Timestamp(date.getTime()));
    }
}



output

2010-03-08 14:59:30.252

Project Euler Problem 25 in Java

PROBLEM


The Fibonacci sequence is defined by the recurrence relation:

Fn = Fn1 + Fn2, where F1 = 1 and F2 = 1.
Hence the first 12 terms will be:

F1 = 1
F2 = 1
F3 = 2
F4 = 3
F5 = 5
F6 = 8
F7 = 13
F8 = 21
F9 = 34
F10 = 55
F11 = 89
F12 = 144
The 12th term, F12, is the first term to contain three digits.

What is the first term in the Fibonacci sequence to contain 1000 digits?


ANSWER

4782

JAVACODE

import java.math.BigInteger;

public class Problem25 {
public static void main(String[]args){
int term=3;
BigInteger pr=new BigInteger("1");
BigInteger in=new BigInteger("2");
for (; in.toString().length()<1000; ) {
BigInteger tm=pr;
pr=in;
in=in.add(tm);
term++;
}
System.out.println(term);
}
}

Project Euler Problem 16 in Java

PROBLEM


215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.

What is the sum of the digits of the number 21000?

ANSWER


1366

JAVA CODE

import java.math.BigInteger;

public class Problem16 {

public static void main(String[]args){

BigInteger mul=new BigInteger("1");

BigInteger bg=new BigInteger("2");

for (int i = 0; i < 1000; i++) {

mul=mul.multiply(bg);

}

int sum=0;

String text=mul.toString();

for (int i = 0; i < text.length(); i++) {

sum+=Integer.parseInt(new Character(text.charAt(i)).toString());

}

System.out.println(sum);

}

}

Project Euler Problem 9 in Java

PROBLEM


A Pythagorean triplet is a set of three natural numbers, a  b  c, for which,

a2 + b2 = c2
For example, 32 + 42 = 9 + 16 = 25 = 52.

There exists exactly one Pythagorean triplet for which a + b + c = 1000.
Find the product abc.

ANSWER

31875000

JAVA CODE


public class Problem9 {
public static void main(String[]args){
int a=3;
int b=4;
int c=1000-(b+a);
int ans=0;
boolean find=false;
for (int i = 4; i < 496; i++) {

for (int j = 5; j < 499; j++) {

if((Math.pow(a,2)+Math.pow(b,2))==Math.pow(c,2)){
ans=a*b*c;
System.out.println("a="+a+"b="+b+"c="+c);
find=true;
break;
}
b=j;
c=1000-(b+a);
}

a=i;
if(find)
break;
}


System.out.println(ans);

}
}

java code for eular project problem 20

PROBLEM


n! means n  (n  1)  ...  3  2  1

For example, 10! = 10  9  ...  3  2  1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.

Find the sum of the digits in the number 100!

ANSWER

648

JAVA CODE


public class Problem20 {
public static void main(String[]args){
int ans=0;
BigInteger val=getNum(100);
String data=val.toString();
for (int i = 0; i < data.length(); i++) {
ans+=Integer.parseInt(new Character(data.charAt(i)).toString());
}
System.out.println(ans);
}

private static BigInteger getNum(int i) {
BigInteger ret=new BigInteger("1");
for (int j = 1; j <= i; j++) {
ret=ret.multiply(new BigInteger(Integer.toString(j)));
}
return ret;
}
}

answer java code for eular problem 10

PROBLEM


The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.

Find the sum of all the primes below two million.

ANSWER



142913828922

JAVA CODE

public class Problem10 {

public static void main(String[]args){

primeGenerator();

}

private static void primeGenerator() {

int max=2000000;

BigInteger bg=new BigInteger("0");

for (int j = 2; j < max; j++) {

boolean prime=true;

for (int i = 2; i <= (int)Math.sqrt(j); i++) {

if(j%i==0 )

prime=false;

}

if(prime){

BigInteger add=new BigInteger(Integer.toString(j));

bg=bg.add(add);

}

}

System.out.println("ans="+bg);

}

}

java code for eular project problem5

PROBLEM


2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.

What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?

ANSWER


232792560

JAVA CODE


public class Problem5 {
public static void main(String[]args){
int ans=0;
for (int i = 100000000; i <1000000000; i++) {
boolean state=true;
for (int j = 3; j <21; j++) {
ans=i;
if(i%j!=0||i==9999999){
//ans=-1;
state=false;
break;
}

}

if(state){
break;
}
}
System.out.println(ans);
}
}

java answer for eular project problem 7

PROBLEM 7



By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.

What is the 10 001st prime number?

ANSWER

104743

JAVA CODE


public class Problem7 {
public static void main(String[]args){


primeGenerator();
}

private static void primeGenerator() {

int max=775146;
int primeCount=0;
int ans=0;
for (int j = 2; j < max; j++) {
boolean prime=true;

for (int i = 2; i <= (int)Math.sqrt(j); i++) {
if(j%i==0 )
prime=false;

}


if(prime){
primeCount++;
ans=j;
}

if(primeCount>=10001)
break;

}
System.out.println("ans="+ans);
}
}

eular project-problem6

PROBLEM 6
The sum of the squares of the first ten natural numbers is,

12 + 22 + ... + 102 = 385
The square of the sum of the first ten natural numbers is,

(1 + 2 + ... + 10)2 = 552 = 3025
Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025  385 = 2640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

ANSWER


25164150

JAVA CODE


public class Problem6 {
public static void main(String[]args){
int sumOfTheSquares=0;
int squareOfTheSum=0;
for (int i = 0; i <101; i++) {
sumOfTheSquares+=(int)Math.pow(i, 2);
squareOfTheSum+=i;
}
System.out.println((int)Math.pow(squareOfTheSum,2)-sumOfTheSquares);
}
}

answer for eular project-problem4

PROBLEM


A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91  99.

Find the largest palindrome made from the product of two 3-digit numbers.

ANSWER
906609

JAVA CODE



public class Palindrome {
public static void main(String[]args){

int palindrome=0;
for (int i = 999; i >0; i--) {
for (int j = 999; j>0; j--) {
int prod=i*j;
String forward=Integer.toString(prod);
String reverse=new StringBuffer(forward).reverse().toString();
//System.out.println(forward+"back="+reverse);
if(forward.equalsIgnoreCase(reverse)&&prod>palindrome){

palindrome=i*j;

break;
}
}

}
System.out.println(palindrome);
}
}

answer for eula project- problem3

PROBLEM
The prime factors of 13195 are 5, 7, 13 and 29.

What is the largest prime factor of the number 600851475143 ?

ANSWER

6857

JAVA CODE

import java.math.BigInteger;

public class PrimeFactor {

public static void main(String[]args){

BigInteger req=new BigInteger("600851475143");

primeGenerator(req);

}

private static void primeGenerator(BigInteger req) {

int max=775146;//sqrt of 600851475143

int ans=0;

for (int j = 2; j < max; j++) {

boolean prime=true;

for (int i = 2; i <= (int)Math.sqrt(j); i++) {

if(j%i==0 )

prime=false;

}

if(prime){

BigInteger bi=new BigInteger(Integer.toString(j));

BigInteger mode=new BigInteger("0");

if(req.mod(bi).equals(mode) &&ans<j){

ans=j;

}

}

}

System.out.println("ans="+ans);

}

}