XPATH Java simple example(read the xml file from java)

XPath is used to search any node any element in XML file. ---- very basic defination.

XPath is a fourth generation declarative language for locating nodes in XML documents. This is much more robust than writing the detailed search and navigation code yourself using DOM, SAX, or JDOM. using XPath in a Java program is like using SQL in a Java program. To extract information from a database, you write a SQL statement indicating what information you want and you ask JDBC to fetch it for you. You neither know nor care how JDBC communicates with the database. Similarly with XML, you write an XPath expression indicating what information you want from an XML document and ask the XPath engine to fetch it, without concerning yourself with the exact algorithms used to search the XML document.

1. Suppose I have persons.xml
<?xml version="1.0" ?>
<information>
<person id="1">
<name>Binod</name>
<age>24</age>
<gender>Male</gender>
</person>

<person id="2">
<name>Pramod</name>
<age>22</age>
<gender>Male</gender>
</person>

<person id="3">
<name>Swetha</name>
<age>19</age>
<gender>Female</gender>
</person>
</information>

2. XPathJavaExample.java

import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class XPathJavaExample {
public static void main(String[] args)
throws ParserConfigurationException, SAXException,
IOException, XPathExpressionException {
DocumentBuilderFactory domFactory =
DocumentBuilderFactory.newInstance();
domFactory.setNamespaceAware(true);
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = builder.parse("persons.xml");
XPath xpath = XPathFactory.newInstance().newXPath();
XPathExpression expr = xpath.compile("//person/*/text()");Object result = expr.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
for (int i = 0; i < nodes.getLength(); i++) {
System.out.println(nodes.item(i).getNodeValue());
}
}
}

The output of this xpath query ("//person/*/text()");
Binod
24
Male
Pramod
22
Male
Swetha
19
Female

XPathExpression expr = xpath.compile("//person[last()]/*/text()"); This will be give the last record
Swetha
19
Female

XPathExpression expr = xpath.compile("//person/name/text()"); Here name is mentioned instaed of *. * means all the attribute. The output
Binod
Pramod
Swetha
Only name shows here.

XPathExpression expr = xpath.compile("//person[1]/*/text()"); Retrive first record
Binod
24
Male

XPathExpression expr = xpath.compile("//name/text()"); It will show all the name tag, that would be anywhere in xml. The output
Binod
Pramod
Swetha

XPathExpression expr = xpath.compile("//person[age>20]/*/text()"); Output would be
all age that is greater than 20
Binod
24
Male
Pramod
22
Male

How to insert IMAGE in PDF using iText

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Image;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;

public class Demo {
/**
* @param args
*/
public static void main(String[] args) {
new Demo().createPDF();
}
public void createPDF(){
Document d = new Document (PageSize.A4);
try {
PdfWriter.getInstance(d, new FileOutputStream("sample.pdf"));
d.open ();
d.addCreator("Binod by Demo.java");
d.addAuthor("Binod Suman");
d.addTitle("First PDF By Binod");
Image image = Image.getInstance("Binod_Flex.jpg");
image.scaleAbsolute(300,300);
d.add(image);
d.close ();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
System.out.println(" PDF Created ***");
}
}

You can now check that one PDF generated with specify image.

To change PDF page background color, use this

Rectangle pageSize = new Rectangle(400,400);
pageSize.setBackgroundColor(new java.awt.Color(0xDF,0xCC,0xFF));
Document d = new Document (pageSize);
and remaining same.

Insert table in PDF,

PdfPTable table=new PdfPTable(2);
table.addCell("Student Name");
table.addCell("Roll No.");
table.addCell("Binod");
table.addCell("110");
table.addCell("Pramod");
table.addCell("120");
d.add(table);

Insert Header in table in PDF

PdfPTable table=new PdfPTable(2);
PdfPCell cell = new PdfPCell(new Paragraph("Student Details"));
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
cell.setBackgroundColor(new Color(20,105,160));
cell.setColspan(2);
table.addCell(cell);
table.addCell("Student Name");
table.addCell("Roll No.");
table.addCell("Binod");
table.addCell("110");
table.addCell("Pramod");
table.addCell("120");
d.add(table);

Add Header and Footer to PDF

HeaderAndFooter.java

requried jars

-----------

itext-2.1.6.jar

itext-rtf-2.1.6.jar

import java.io.FileOutputStream;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.Phrase;
import com.lowagie.text.pdf.ColumnText;
import com.lowagie.text.pdf.PdfAction;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfWriter;
public class HeaderAndFooter extends PdfPageEventHelper{

protected Phrase header;
protected PdfPTable footer;

public static void main(String[] args) {
new HeaderAndFooter().createPDF();
System.out.println("** PDF CREATED **");
}
public void createPDF() {
Document document = new Document();
try{
PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream("Header_Footer_Example.pdf"));
writer.setPageEvent(new HeaderAndFooter());
document.open();
for(int i=0;i<1000;i++){
document.add(new Phrase("BINOD KUMAR SUMAN "));
}
document.close();
}catch(Exception e){
}
}
public HeaderAndFooter() {
header = new Phrase("**** THIS IS HEADER PART OF THIS PDF ****");
footer = new PdfPTable(1);
footer.setTotalWidth(300);
footer.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
footer.addCell(new Phrase(new Chunk("**** THIS IS FOOTER PART OF THIS PDF ****")
.setAction(new PdfAction(PdfAction.FIRSTPAGE))));
}
public void onEndPage(PdfWriter writer, Document document) {
PdfContentByte cb = writer.getDirectContent();
ColumnText.showTextAligned(cb, Element.ALIGN_CENTER, header,(document.right() - document.left()) / 2+ document.leftMargin(), document.top() + 10, 0);

footer.writeSelectedRows(0, -1,(document.right() - document.left() - 300) / 2+ document.leftMargin(), document.bottom() - 10, cb);
}
}

Format the date:
--------------------

Date date = new Date();

// Some examples
formatter = new SimpleDateFormat("MM/dd/yy");
String s = formatter.format(date);
// 01/09/02

formatter = new SimpleDateFormat("dd-MMM-yy");
s = formatter.format(date);
// 29-Jan-02

// Examples with date and time; see also
// Formatting the Time Using a Custom Format
formatter = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss");
s = formatter.format(date);
// 2002.01.29.08.36.33

formatter = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss Z");
s = formatter.format(date);
// Tue, 09 Jan 2002 22:14:02 -0500

Merge two Pdf Files
------------------------
required jar files
--------------------
iText-2.1.6.jar
iText-rtf-2.1.6.jar

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.lowagie.text.Document;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;

public class MergePDF {
public static void main(String[] args) {
try {
List<InputStream> pdfs = new ArrayList<InputStream>();
pdfs.add(new FileInputStream("c:\\pdf\\1.pdf"));
pdfs.add(new FileInputStream("c:\\pdf\\2.pdf"));
OutputStream output = new FileOutputStream("c:\\pdf\\merge.pdf");
MergePDF.concatPDFs(pdfs, output, true);
} catch (Exception e) {
e.printStackTrace();
}
}

public static void concatPDFs(List<InputStream> streamOfPDFFiles, OutputStream outputStream, boolean paginate) {

Document document = new Document();
try {
List<InputStream> pdfs = streamOfPDFFiles;
List<PdfReader> readers = new ArrayList<PdfReader>();
int totalPages = 0;
Iterator<InputStream> iteratorPDFs = pdfs.iterator();

// Create Readers for the pdfs.
while (iteratorPDFs.hasNext()) {
InputStream pdf = iteratorPDFs.next();
PdfReader pdfReader = new PdfReader(pdf);
readers.add(pdfReader);
totalPages += pdfReader.getNumberOfPages();
}
// Create a writer for the outputstream
PdfWriter writer = PdfWriter.getInstance(document, outputStream);

document.open();
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
// data

PdfImportedPage page;
int currentPageNumber = 0;
int pageOfCurrentReaderPDF = 0;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();

// Loop through the PDF files and add to the output.
while (iteratorPDFReader.hasNext()) {
PdfReader pdfReader = iteratorPDFReader.next();

// Create a new page in the target for each source page.
while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
document.newPage();
pageOfCurrentReaderPDF++;
currentPageNumber++;
page = writer.getImportedPage(pdfReader, pageOfCurrentReaderPDF);
cb.addTemplate(page, 0, 0);

// Code for pagination.
if (paginate) {
cb.beginText();
cb.setFontAndSize(bf, 9);
cb.showTextAligned(PdfContentByte.ALIGN_CENTER, "" + currentPageNumber + " of " + totalPages, 520, 5, 0);
cb.endText();
}
}
pageOfCurrentReaderPDF = 0;
}
outputStream.flush();
document.close();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (document.isOpen())
document.close();
try {
if (outputStream != null)
outputStream.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
}

Struts and Tiles Integration.

web.xml:
---------

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>Idea Exchange</display-name>

//This is location of the tiles configuration
<context-param>
<param-name>
org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG</param-name>
<param-value>/WEB-INF/ideazExchangeTiles-defs.xml</param-value>
</context-param>

<filter>
<filter-name>ie</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
//Enabling the spring in struts2
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

//Enabling the Tiles in Struts2
<listener>
<listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class>
</listener>
<filter-mapping>
<filter-name>ie</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>Captcha</servlet-name>

<servlet-class>com.asman.servlet.AsmanCaptcha</servlet-class>
<init-param>
<description>passing height</description>
<param-name>height</param-name>
<param-value>30</param-value>
</init-param>
<init-param>
<description>passing height</description>
<param-name>width</param-name>
<param-value>120</param-value>
</init-param>
</servlet>

<servlet-mapping>
<servlet-name>Captcha</servlet-name>
<url-pattern>/Captcha.jpeg</url-pattern>
</servlet-mapping>

<session-config>
<session-timeout>30</session-timeout>
</session-config>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

struts.xml
---------

struts>
<constant name="struts.devMode" value="true" />
<package name="default " namespace="/"
extends="struts-default,json-default">
<result-types>
<result-type name="tiles"
class="org.apache.struts2.views.tiles.TilesResult" />
</result-types>

<action name="ideHome" method="passthru" class="loginAction">
<result name="loginhome" type="tiles">home</result>

</action>
ideazExchangeTiles-defs.xml

<!DOCTYPE tiles-definitions PUBLIC
    "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
    "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">
<tiles-definitions>
 <definition name="helloworld.home" template="/layouts/layout.jsp">
  <put-attribute name="header" value="/layouts/header.jsp" />
  <put-attribute name="home" value="/index.html" />
  <put-attribute name="footer" value="/layouts/footer.jsp" />
 </definition>
</tiles-definitions>

JUNIT TESTING FOR STRUTS2 ACTION CLASSES
/**
*
*/
package com.asman.ide.base.test;
import java.util.HashMap;

import junit.framework.TestCase;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.Dispatcher;
import org.apache.struts2.views.JspSupportServlet;
import org.springframework.context.ApplicationContext;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.mock.web.MockServletConfig;
import org.springframework.mock.web.MockServletContext;
import org.springframework.web.context.ContextLoader;

import com.opensymphony.xwork2.ActionProxy;
import com.opensymphony.xwork2.ActionProxyFactory;
import com.opensymphony.xwork2.ActionSupport;

/**
*
* @author KONDA REDDY. LINGAMDINNE
*/

public abstract class IDEActionBaseTest extends TestCase {

private static final String CONFIG_LOCATIONS ="applicationContext.xml"+",ideazExchangeTiles-defs.xml";

private static ApplicationContext applicationContext;

private Dispatcher dispatcher;

protected ActionProxy proxy;

protected static MockServletContext servletContext;

protected static MockServletConfig servletConfig;

protected MockHttpServletRequest request;

protected MockHttpServletResponse response;

public IDEActionBaseTest(String name) {

super(name);

}

@SuppressWarnings({ "unchecked", "deprecation", "rawtypes" })
protected ActionSupport createAction( String namespace, String name)

throws Exception {

proxy = dispatcher.getContainer().getInstance(ActionProxyFactory.class).createActionProxy(namespace, name, null, true, false);

proxy.getInvocation().getInvocationContext().

setParameters(new HashMap());

proxy.setExecuteResult(true);

ServletActionContext.setContext(

proxy.getInvocation().getInvocationContext());

request = new MockHttpServletRequest();

response = new MockHttpServletResponse();

ServletActionContext.setRequest(request);

ServletActionContext.setResponse(response);

ServletActionContext.setServletContext(servletContext);

return (ActionSupport) proxy.getAction();

}

@SuppressWarnings({ "rawtypes", "unchecked" })
protected void setUp() throws Exception {

if (applicationContext == null) {

servletContext = new MockServletContext();

servletContext.addInitParameter(
ContextLoader.CONFIG_LOCATION_PARAM,

CONFIG_LOCATIONS);

applicationContext = (new ContextLoader())
.initWebApplicationContext(servletContext);

new JspSupportServlet().init(new MockServletConfig(servletContext));

}

HashMap params = new HashMap();

params.put("actionPackages", "com.asman.ie.admin.action");

dispatcher = new Dispatcher(servletContext, params);

dispatcher.init();

Dispatcher.setInstance(dispatcher);

}

}

LoginActionTest
--------------------

package com.asman.ide.base.test;

import com.asman.ie.view.UsersView;
import com.asman.ie.admin.action.LoginAction;

public class LoginActionTest extends IDEActionBaseTest {

public LoginActionTest(String name) {
super(name);
// TODO Auto-generated constructor stub
}

protected void setUp() throws Exception {
super.setUp();
}

protected void tearDown() throws Exception {
super.tearDown();
}

public void testLogin() throws Exception {

LoginAction loginAction = (LoginAction) createAction("/", "login");

UsersView usersView = new UsersView();

loginAction.setUsersView(usersView);

usersView.setLoginId("use");
usersView.setPassword("fuhdsiah");

// loginAction.login();

// System.out.println(loginAction.login());

}

}

------------------------------------------------------------------------

FEB

Log4j Logger for Struts 2 Exception Interceptor

Struts.xml

<package name="default" extends="struts-default">
<interceptor-stack name="defaultStack">
<interceptor-ref name="timer"/>
<interceptor-ref name="logger"/>
<interceptor-ref name="exception">
<param name="logEnabled">true</param>
<param name="logCategory">error.unhandled</param>
<param name="logLevel">WARN</param>
</interceptor-ref>
</interceptor-stack>
</package>

Log4j.xml

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">

    <layout class="org.apache.log4j.PatternLayout">

        <param name="ConversionPattern" value="%p [%c] - %C{1}.%M(%L) | %m%n"/>

    </layout>

</appender>

<logger name="error.unhandled">

    <level value="DEBUG"/>

    <appender-ref ref="CONSOLE" />

</logger>

However, when Struts throws an exception, it is not properly logged by log4j. I know that my log4j.xml is being parsed correctly since I can manually create a java class with a logger called "error.unhandled" and write ERROR level messages directly to it. A colleague also suggested that I should try trapping the log4j.logger.error.unhandled logger but that did not work either.

Which logger does Struts 2 use for the exception interceptor?

Emails Seperator from Text File

<HEAD>

<SCRIPT LANGUAGE="JavaScript">






</script>
</HEAD>



<BODY>

<center>
<form>
<textarea name=comments rows=10 cols=50 onBlur="this.form.email.value=findEmailAddresses(this.value);"></textarea>
<br>
Email: <input type=text name=email>
</form>
</center>

<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

how to use robot class in java

/*Here is another Robot java code for you,with explanation....
this program when you run it writes something for you...mean this program will communicate with you!
Just kidding.
About Robot:
Robot is a class in Java, where it controls mouse, keyboard with the help of its methods.
Lets start with example...*/
//Program starts here


import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
public class RobotExp {

 public static void main(String[] args){

//code to open a notepad
  try{

 ProcessBuilder proc=new ProcessBuilder("notepad.exe","AM-ROBOT");
  proc.start();
   }
  catch(Exception k){
  System.out.println(k);
  }

//code to write message
 try {
  Robot robot = new Robot();
  robot.delay(5000); 
  robot.keyPress(KeyEvent.VK_SPACE);
  robot.keyPress(KeyEvent.VK_I);  
  robot.keyPress(KeyEvent.VK_A);
  robot.keyPress(KeyEvent.VK_M);
  robot.keyPress(KeyEvent.VK_SPACE);
  robot.keyPress(KeyEvent.VK_R);
  robot.keyPress(KeyEvent.VK_O);
  robot.keyPress(KeyEvent.VK_B);
  robot.keyPress(KeyEvent.VK_O);
  robot.keyPress(KeyEvent.VK_SPACE);
  robot.keyPress(KeyEvent.VK_T);
  robot.keyPress(KeyEvent.VK_A);
  robot.keyPress(KeyEvent.VK_L);
  robot.keyPress(KeyEvent.VK_K);
  robot.keyPress(KeyEvent.VK_SPACE);
  robot.keyPress(KeyEvent.VK_T); 
  robot.keyPress(KeyEvent.VK_O);
  robot.keyPress(KeyEvent.VK_SPACE);
  robot.keyPress(KeyEvent.VK_M);
  robot.keyPress(KeyEvent.VK_E);
  } 
  catch (AWTException e) {
                 e.printStackTrace();
   }
  }
}
//program completed

java program to move mouse

A sample application which makes your mouse to move automatically randomly on screen with high speed.

Robot Mouse code:

//Program starts here

import java.awt.Robot;

public class MouseControl

{

public static void main(String[] hj)

{

try

{

//to move mouse with more speed use this for loop

for(int i=0;i<10000;i++){

Robot ro=new Robot();

ro.mouseMove((int)(Math.random()*1024),(int)(Math.random()*786));

}

catch(Exception e)

{

System.out.println(e);

}

How to open notepad using java program

------------------------------------------------------------------------

It is very simple to open a note pad using your java program..

And this is achieved by a class named ProcessBuilder ,
All processes are represented Process class and ProcessBuilder offers more control more over the processes.

ProcessBuilder defines three constructors.

ProcessBuilder(List<String> args)

ProcessBuilder(String.....arg)

Here args are list of arguments that specify the name of the progrm to be executed along with any reqired command line arguments.

Now lets see an example which open notepad..

class ProcessDemo{
public static void main(String[] jfb){
try{
ProcessBuilder proc=new ProcessBuilder("notepad.exe","JBFB");
proc.start();
}catch(Exception hj){
System.out.println("Error not der"+hj);
}
}
}

Front end validations:
--------------------------
driver_validation.js
-------------------

function validate(){

document.getElementById('driver_name_error').innerHTML="";

document.getElementById('driver_licence_error').innerHTML="";
document.getElementById('driver_address_error').innerHTML="";
document.getElementById('driver_contact_error').innerHTML="";

var driver_name=document.forms["driver_register"]["driver_name"].value;
var driver_licence=document.forms["driver_register"]["driver_licence"].value;
var driver_address=document.forms["driver_register"]["driver_address"].value;
var driver_contact=document.forms["driver_register"]["driver_contact"].value;

if (driver_name==null || driver_name=="")
{
document.getElementById('driver_name_error').innerHTML ="Please enter Driver Name.";

}

if(!isNaN(driver_name))
{

document.getElementById('driver_name_error').innerHTML ="Driver Name should be a String.";

}

if (driver_licence==null || driver_licence=="")
{
document.getElementById('driver_licence_error').innerHTML ="Please enter driver licence.";

}

if (driver_address==null || driver_address=="")
{
document.getElementById('driver_address_error').innerHTML ="Please enter driver address.";

}
if (driver_contact==null || driver_contact=="")
{
document.getElementById('driver_contact_error').innerHTML ="Please enter driver contact.";

}
if(driver_contact.length<10){

document.getElementById('driver_contact_error').innerHTML ="Contact Number should contain 10 digits.";

}

if(isNaN(driver_contact))
{

document.getElementById('driver_contact_error').innerHTML ="driver contact should be a integer.";

}

if(driver_name==null || driver_name=="" || !isNaN(driver_name) || driver_licence==null || driver_licence=="" || driver_address==null || driver_address=="" || driver_contact==null || driver_contact=="" || driver_contact.length<10 || isNaN(driver_contact))
{
return false;
}

}

form page:
-----------

<html>
<%@ taglib uri="/struts-tags" prefix="s"%>
<head>
<script type="text/javascript" src="js/driver_validation.js">

</script>
<body bgcolor="#8888cc">
<table>
<s:form action="driverAction" method="driverRegistation" name="driver_register">
<tr><td><s:textfield name="driver_name" id="driver_name"label="Name"></td><td><div id="driver_name_error" style="color: red"></div></s:textfield></td></tr>
<tr><td><s:textfield name="driver_licence" id="driver_licence" label="Licence"></td><td><div id="driver_licence_error" style="color: red"></div></s:textfield></td></tr>
<tr><td><s:textarea name="driver_address" id="driver_address" label="Address"></td><td><div id="driver_address_error" style="color: red"></div></s:textarea></td></tr>
<tr><td><s:textarea name="driver_contact" id="driver_contact" label="contact"></td><td><div id="driver_contact_error" style="color: red"></div></s:textarea></td></tr>
<s:submit value="New Driver" action="driverAction" method="driverRegistation" onclick="return validate();"></s:submit>

</s:form>
</table>
</body>

Data Ecncryption and Decryption in java
-------------------------------------------------
package com.asman.action;

import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.jasypt.util.password.BasicPasswordEncryptor;
import org.jasypt.util.text.BasicTextEncryptor;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
* Handles Encryption of user login credentials.
*
* @author Asman
*/
public class Encryption {
private static final String ALGO = "AES";
private static final byte[] keyValue = new byte[] { 'T', 'h', 'e', 'B',
'e', 's', 't', 'S', 'e', 'c', 'r', 'e', 't', 'K', 'e', 'y' };

/**
* Encryption levelone.
*
* @param data
* @return encryptedValue
* @throws Exception
*/
public static String levelOneEncryption(String data) throws Exception {
Key key = generateKey();
Cipher cipher = Cipher.getInstance(ALGO);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encVal = cipher.doFinal(data.getBytes());
String encryptedValue = new BASE64Encoder().encode(encVal);
return encryptedValue;
}

/**
* Generate Key.
*
* @return
* @throws Exception
*/
private static Key generateKey() throws Exception {
Key key = new SecretKeySpec(keyValue, ALGO);
return key;
}

/**
* String Generation leveltwo.
*
* @param data
* @return
*/
public static String levelTwoEncryption(String data) {

String results;
String userPassword = "PassWord";
BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
textEncryptor.setPassword(userPassword);
results = textEncryptor.encrypt(data);
return results;
}

/**
* Password encryption.
*
* @param password
* @return encryptedpassword
*/
public static String passwordEncryption(String password) {
BasicPasswordEncryptor ps = new BasicPasswordEncryptor();
String encryptedpassword = ps.encryptPassword(password);
return encryptedpassword;
}

/**
* Password decryption.
*
* @param data
* @return decryptdata
*/
public static String decryptTwoLevel(String data) {
String userPassword = "PassWord";
BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
textEncryptor.setPassword(userPassword);
String decryptdata = textEncryptor.decrypt(data);

return decryptdata;
}

/**
* Decryption OneLevel.
*
* @param encryptedData
* @return decryptedValue
* @throws Exception
*/
public static String decryptOneLevel(String encryptedData) throws Exception {
Key key = generateKey();
Cipher cipher = Cipher.getInstance(ALGO);
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);
byte[] decValue = cipher.doFinal(decordedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}

}

Send a mesg to mail:
-------------------------

public class SendMail
{
public static void main (String args[])
{
String SMTPHost = "mail.asmansoft.com";
String from = "lnarayana.mudigondla@asmansoft.com";
String to = forgotpasswordlist.get(0).getEmail();

// Get system properties
Properties props = System.getProperties();

// Setup mail server
Authenticator auth = new PopupAuthenticator();
props.put("mail.smtp.host", SMTPHost);

props.put("mail.smtp.auth", "true");

Session session = Session.getInstance(props, auth);
session.setDebug(true);

MimeMessage message = new MimeMessage(session);

message.setFrom(new InternetAddress(from, "lnarayana.mudigondla@asmansoft.com"));

message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to, "lnarayana.mudigondla@asmansoft.com"));

message.setSubject("gadget password");

message.setText(forgotpasswordlist.get(0).getPassword());

Transport.send(message);
System.out.println("Mail Sent");
return SUCCESS;
}
}

PDF generation in java
------------------------------
required jar files:

Text-2.1.6.jar
iText-rtf-2.1.6.jar
Text-rups-2.1.6.jar

HTMLWritter.java

view plaincopy to clipboardprint?
/** 
 * File Name         :  HTMLWritter.java 
 * Created By        :  Nagaraju v 
 * Created Date      :  Jun 19, 2009 
 * Purpose           :   
 */  
package com.raj.iTextPDF;  
  
import java.awt.Color;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import com.lowagie.text.*;  
import com.lowagie.text.pdf.PdfContentByte;  
import com.lowagie.text.html.HtmlWriter;  
  
/** 
 * @author nagarajuv 
 * 
 */  
public class HTMLWritter {  
  
 /** 
  * @param args 
  */  
 public static void main(String[] args) {  
  System.out.println("--> resulting HTML: HelloWorldHTMLMultiple");  
  // step 1: creation of a document-object  
  Document document = new Document();  
  try {  
   // step 2: we create a writer  
   HtmlWriter.getInstance(document,new FileOutputStream("HelloWorldHTMLMultiple.htm"));  
  
   // step 3: we open the document  
   document.open();  
     
   // step 4: we add a paragraph to the document  
   Font font = new Font(Font.COURIER, 10, Font.BOLD);  
   font.setColor(new Color(0xEE, 0xEE, 0xEE));  
   Chunk fox = new Chunk("HTML Writer", font);  
   float superscript = 8.0f;  
   fox.setTextRise(superscript);  
   fox.setBackground(new Color(0xa5, 0x2a, 0x2a));  
   Chunk jumps = new Chunk(" Example ", new Font());  
   Chunk dog = new Chunk("Nagaraju", new Font(Font.TIMES_ROMAN,  
     14, Font.ITALIC));  
   float subscript = -8.0f;  
   dog.setTextRise(subscript);  
   dog.setUnderline(new Color(0xFF, 0x00, 0x00), 3.0f, 0.0f, -5.0f  
     + subscript, 0.0f, PdfContentByte.LINE_CAP_ROUND);  
   document.add(fox);  
   document.add(jumps);  
   document.add(dog);  
   document.add(new Paragraph(" Paaaaaaaaaaragraph"));  
  } catch (DocumentException de) {  
   System.err.println(de.getMessage());  
  } catch (IOException ioe) {  
   System.err.println(ioe.getMessage());  
  }  
   
  // step 5: we close the document  
  document.close();  
 }  
}  

download from this link http://www.mediafire.com/?jmgmmlxgicn

Country and State drop down list In JavaScript
--------------------------------------------------------------------------

countries.js:
----------

Select Country:<select onchange="print_state(this.selectedIndex);"id="country" name="country">

<s:property value='country' /></option> </select>

<tr><td>State:

<s:property value='userView.state' /></option>

</select><script language="javascript">print_country("country");

How to read Excel File in Java

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.Locale;

import java.util.Set;

import jxl.Cell;

import jxl.DateCell;

import jxl.Sheet;

import jxl.Workbook;

import jxl.WorkbookSettings;

import jxl.read.biff.BiffException;

import p1.Client;

import p1.ClientAddress;

import p1.ContactDetails;

//import p1.MyHelper;

import p1.Technologies;

import p1.Users;

public class ExcelReading {

public void init(String filePath) {

FileInputStream fs = null;

try {

fs = new FileInputStream(new File(filePath));

contentReading(fs);

} catch (IOException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

fs.close();

} catch (IOException e) {

e.printStackTrace();

}

// Returns the Headings used inside the excel sheet

public void getHeadingFromXlsFile(Sheet sheet) {

int columnCount = sheet.getColumns();

System.out.println("NO OF COLUMNS ARE. . . ." + columnCount);

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

System.out.println(sheet.getCell(i, 0).getContents());

}

public void contentReading(InputStream fileInputStream) {

WorkbookSettings ws = null;

Workbook workbook = null;

Sheet s = null;

Cell rowData[] = null;

int rowCount = '0';

int columnCount = '0';

DateCell dc = null;

int totalSheet = 0;

try {

ws = new WorkbookSettings();

ws.setLocale(new Locale("en", "EN"));

workbook = Workbook.getWorkbook(fileInputStream, ws);

totalSheet = workbook.getNumberOfSheets();

if (totalSheet > 0) {

System.out.println("Total Sheet Found:" + totalSheet);

for (int j = 0; j < totalSheet; j++) {

System.out.println("Sheet Name:"

+ workbook.getSheet(j).getName());

}

// Getting Default Sheet i.e. 0

s = workbook.getSheet(0);

// Reading Individual Cell

getHeadingFromXlsFile(s);

// Total Total No Of Rows in Sheet, will return you no of rows that

// are occupied with some data

System.out.println("Total Rows inside Sheet:" + s.getRows());

rowCount = s.getRows();

// Total Total No Of Columns in Sheet

System.out.println("Total Column inside Sheet:" + s.getColumns());

columnCount = s.getColumns();

Client client = null;

DataFeeder dataFeeder = new DataFeeder();

// Reading Individual Row Content

for (int i = 1; i < rowCount; i++) {

// Get Individual Row

rowData = s.getRow(i);

if (rowData[0].getContents().length() != 0) { // the first date

// column must

client = new Client();

client.setClientName(rowData[1].getContents());

Set<ClientAddress> cad = client.getClientAddresses();

ClientAddress cAddress = new ClientAddress();

cAddress.setAddress(rowData[2].getContents());

cAddress.setCity(rowData[3].getContents());

cAddress.setState(rowData[4].getContents());

cAddress.setCountry(rowData[5].getContents());

cAddress.setPhone(rowData[6].getContents());

cAddress.setFax(rowData[7].getContents());

cAddress.setClient(client);

cad.add(cAddress);

client.setDomain(rowData[8].getContents());

Set<ContactDetails> contacts = client.getContactDetailses();

ContactDetails contactDetails = new ContactDetails();

contactDetails.setClient(client);

contactDetails.setName(rowData[10].getContents());

contactDetails.setDesignation(rowData[11].getContents());

contactDetails.setContactNo(rowData[12].getContents());

contactDetails.setMail(rowData[13].getContents());

contacts.add(contactDetails);

client.setWebLink(rowData[14].getContents());

client.setOurscope(rowData[15].getContents());

client.setStatus(rowData[16].getContents());

dataFeeder.saveClient(client);

// not null

* for (int j = 1; j < columnCount; j++) {

* System.out.println("record:" + rowData[j].getContents());

* client.setClientName(rowData[j].getContents());

* }

}

client.toString();

if (client != null) {

* System.out.println(client.getClientName());

* System.out.println(client.getDomain());

* System.out.println(client.getOurscope());

* System.out.println(client.getWebLink());

System.out.println(client.toString());

}

workbook.close();

} catch (IOException e) {

e.printStackTrace();

} catch (BiffException e) {

e.printStackTrace();

}

public static void main(String[] args) {

try {

ExcelReading xlReader = new ExcelReading();

xlReader.init("DataminingTemplate.xls");

} catch (Exception e) {

e.printStackTrace();

}

}

note:You will try to execute above program need jxl jar file

How to read Properties File in Java – XML and Text Example Tutorial

properties file

----------------

jdbc.username=test
jdbc.password=unknown
jdbc.driver=com.mysql.jdbc.Driver

Java class

----------

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;

public class PropertyFileReader {

public static void main(String args[]) throws FileNotFoundException, IOException {

//Reading properties file in Java example
Properties props = new Properties();
FileInputStream fis = new FileInputStream("c:/jdbc.properties");

//loading properites from properties file
props.load(fis);

//reading proeprty
String username = props.getProperty("jdbc.username");
String driver = props.getProperty("jdbc.driver");
System.out.println("jdbc.username: " + username);
System.out.println("jdbc.driver: " + driver);

}
}

Read XML file in Java Using SAX Parser Example

Sample Example of reading XML File – SAX Parser

<?xml version="1.0" encoding="UTF-8"?>

<Bank>

<Name>Jack Robinson</Name>

</Account>

<Name>Sony Corporation</Name>

</Account>

</Bank>

package parser;

public class Account {

private String name;

private int id;

private int amt;

private String type;

public Account() {

}

public Account(String name, int id, int amt, String type) {

this.name = name;

this.amt = amt;

this.id = id;

this.type = type;

}

public int getAmt() {

return amt;

}

public void setAmt(int amt) {

this.amt = amt;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public String toString() {

StringBuffer sb = new StringBuffer();

sb.append("Account Details - ");

sb.append("Name:" + getName());

sb.append(", ");

sb.append("Type:" + getType());

sb.append(", ");

sb.append("Id:" + getId());

sb.append(", ");

sb.append("Age:" + getAmt());

sb.append(".");

return sb.toString();

}

Sample Code for implementing SAX parser in Java

package parser;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

public class ReadXMLFileUsingSaxparser extends DefaultHandler {

private Account acct;

private String temp;

private ArrayList<Account> accList = new ArrayList<Account>();

/** The main method sets things up for parsing */

public static void main(String[] args) throws IOException, SAXException,

ParserConfigurationException {

//Create a "parser factory" for creating SAX parsers

SAXParserFactory spfac = SAXParserFactory.newInstance();

//Now use the parser factory to create a SAXParser object

SAXParser sp = spfac.newSAXParser();

//Create an instance of this class; it defines all the handler methods

ReadXMLFileUsingSaxparser handler = new ReadXMLFileUsingSaxparser();

//Finally, tell the parser to parse the input and notify the handler

sp.parse("bank.xml", handler);

handler.readList();

}

* When the parser encounters plain text (not XML elements),

* it calls(this method, which accumulates them in a string buffer

public void characters(char[] buffer, int start, int length) {

temp = new String(buffer, start, length);

}

* Every time the parser encounters the beginning of a new element,

* it calls this method, which resets the string buffer

public void startElement(String uri, String localName,

String qName, Attributes attributes) throws SAXException {

temp = "";

if (qName.equalsIgnoreCase("Account")) {

acct = new Account();

acct.setType(attributes.getValue("type"));

}

* When the parser encounters the end of an element, it calls this method

public void endElement(String uri, String localName, String qName)

throws SAXException {

if (qName.equalsIgnoreCase("Account")) {

// add it to the list

accList.add(acct);

} else if (qName.equalsIgnoreCase("Name")) {

acct.setName(temp);

} else if (qName.equalsIgnoreCase("Id")) {

acct.setId(Integer.parseInt(temp));

} else if (qName.equalsIgnoreCase("Amt")) {

acct.setAmt(Integer.parseInt(temp));

}

private void readList() {

System.out.println("No of the accounts in bank '" + accList.size() + "'.");

Iterator<Account> it = accList.iterator();

while (it.hasNext()) {

System.out.println(it.next().toString());

}

}

Output:
No of the accounts in bank '2'.
Account Details - Name:Jack Robinson, Type:saving, Id:1001, Age:10000.
Account Details - Name:Sony Corporation, Type:current, Id:1002, Age:1000000.

Code Example of checking duplicate on Array in Java

import java.util.Arrays;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

public class CheckDuplicatesInJavaArray {

public static void main(String args[]) {

String[] withDuplicates = new String[] {"one","two","three","one"};

String[] withoutDuplicates = new String[] {"one","two","three"};

System.out.println("Checking array with duplicate using brute force: " +bruteforce(withDuplicates));

System.out.println("Checking array without any duplicate using brute force: " +bruteforce(withoutDuplicates));

System.out.println("Checking array with duplicate using Set and List: " +checkDuplicateUsingSet(withDuplicates));

System.out.println("Checking array without any duplicate using Set and List: " +checkDuplicateUsingSet(withoutDuplicates));

System.out.println("Checking array with duplicate using Set and List: " +checkDuplicateUsingAdd(withDuplicates));

System.out.println("Checking array without any duplicate using Set and List: " +checkDuplicateUsingAdd(withoutDuplicates));

}

* brute force way of checking if array contains duplicates in Java

* comparing each elements to all other elements of array

* complexity on order of O(n^2) not advised in production

public static boolean bruteforce(String[] input) {

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

for (int j = 0; j < input.length; j++) {

if (input[i].equals(input[j]) && i != j) {

return true;

}

return false;

}

* detect duplicate in array by comparing size of List and Set

* since Set doesn't contain duplicate, size must be less for an array which contains duplicates

public static boolean checkDuplicateUsingSet(String[] input){

List inputList = Arrays.asList(input);

Set inputSet = new HashSet(inputList);

if(inputSet.size()< inputList.size())

return true;

}

return false;

}

* Since Set doesn't allow duplicates add() return false

* if we try to add duplicates into Set and this property

* can be used to check if array contains duplicates in Java

public static boolean checkDuplicateUsingAdd(String[] input) {

Set tempSet = new HashSet();

for (String str : input) {

if (!tempSet.add(str)) {

return true;

}

return false;

}

Output:

Checking array with duplicate using brute force: true

Checking array without any duplicate using brute force: false

Checking array with duplicate using Set and List: true

Checking array without any duplicate using Set and List: false

Checking array with duplicate using Set and List: true

Checking array without any duplicate using Set and List: false

2 comments:

Wright PetterFebruary 27, 2018 at 10:51 PM
Thanks for the post, I am techno savvy. I believe you hit the nail right on the head. I am highly impressed with your blog. It is very nicely explained. Your article adds best knowledge to our Java Online Training from India. or learn thru Java Online Training from India Students.
SurajMay 7, 2021 at 9:08 AM
Хорошая информация здесь, я хотел бы поделиться с вами своим опытом получения ссуды для расширения моего швейного бизнеса здесь, в Малайзии. Это было действительно тяжело для моего бизнеса из-за моей небольшой кратковременной болезни, тогда, когда я выздоровел, мне понадобился фонд, чтобы снова создать его, чтобы начать работу, поэтому я наткнулся на г-на Бенджамина, консультанта по кредитам в Службе финансирования. Он спросил меня моего бизнес-проекта, и я сказал ему, что у меня уже есть One, и мне просто нужна ссуда в размере 200 000,00 долларов США, он дал мне форму для заполнения, и я сделал также, он спросил меня о моем действующем удостоверении личности через несколько дней. Они сделали перевод, и моя ссуда была предоставлена. Я действительно хочу поблагодарить их за усилия, а также постараюсь передать это всем, кто ищет бизнес-ссуды или другие финансовые вопросы. Свяжитесь с господином Бенджамином. Электронная почта: 247officedept@gmail.com. Он также доступен в WhatsApp Contact: + 1-9893943740.

laxman

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