How to get Current Time based on Time Zone using java

4:09 PM No Comments

 import java.util.*; import java.text.*;  public class time_Zone {     public static void main(String[] args) {         TimeZone tz = Calendar.getInstance().getTimeZone();         System.out.println("TimeZone: "+tz.getDisplayName());         System.out.println("ID: "+tz.getID());        final Date currentTime = new Date();        final SimpleDateFormat...

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Advantage and disadvantage of servlet

4:08 PM No Comments

Servlet Advantage Servlets provide a way to generate dynamic documents that is both easier to write and faster to run. provide all the powerful features of JAVA, such as Exception handling and garbage collection. Servlet enables easy portability across Web Servers. Servlet can communicate with different servlet and servers. Since all web applications are stateless protocol, servlet uses its own API to maintain  session Servlet Disadvantage Designing in servlet is difficult and slows down the application. Writing complex business logic...

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XPATH Java simple example

7:19 PM No Comments

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...

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How to backup of your blogger blog

7:19 PM No Comments

There are many ways to take your blog backup. Even some tools are also available in market. But here I explain two ways: 1. Write one simple java program and take many blog backup together with timestamp. 2. Use Export and Import facility of blogger 1. Write one simple java code (BlogBackup.java) import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.URL; import...

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How to generate PDF report from Java

7:17 PM No Comments

1. Download iText-2.1.5.jar (You can google and get it)2. Demo.javaimport java.io.FileNotFoundException;import java.io.FileOutputStream;import com.lowagie.text.Document;import com.lowagie.text.DocumentException;import com.lowagie.text.PageSize;import com.lowagie.text.Paragraph;import com.lowagie.text.pdf.PdfWriter;public class Demo {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 ();Paragraph...

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How to insert IMAGE in PDF using iText

7:16 PM No Comments

On assuming that you should have one jpg image in the same folder. In this example I kept Binod_Flex.jpg in the same folder where this java file present.Demo.javaimport 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...

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Add Header and Footer to PDF

7:15 PM No Comments

Before start to work out on this topic. I want to give some concept regarding iText PDF. 1. onStartPage() : It is auto triggerd method when new page started. If pdf has 10 page then it would be execute 10 times. Used this method to initializing variable or setting parameter. But it is not right place add Header and Footer. 2. onEndPage() : It is also auto triggered method during before starting a new page. This is right place to add Header and Footer. To use these method, class should be extended by com.lowagie.text.pdf.PdfPageEventHelper; ...

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Parse XML response in JavaSript

7:13 PM No Comments

Some time we get response from server as xml.This blog will show that how you can handle or parse xml in javascript.1. Suppose you have xml response like this<Students><Student><Name>Binod Kumar Suman</Name><Hostel>Ganga</Hostel><Contact>999999999</Contact></Student></Students>2. In JavaScript functionfunction showResult(){if(request.readyState == 4){var response = request.responseXML;var students = response.getElementsByTagName("Student");document.getElementById("NamelH1").innerHTML...

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Get start with Ajax, Ajax simple example with Servlet, Ajax programming with Servlet

7:12 PM No Comments

I am writing here a very simple ajax program. That will take roll number from jsp page, hit serlvlet, come back with result as XML, parse in javascript and will show on jsp page.1. ShowStudentInfo.jsp<html><head><title>Binod Java Solution AJAX </title><script type="text/javascript">var request; function getName(){var roll = document.getElementById("roll").value;var url = "http://localhost:8080/blog_demo/StudentInfo?roll="+roll;if(window.ActiveXObject){ request = new ActiveXObject("Microsoft.XMLHTTP"); }else if(window.XMLHttpRequest){...

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Parse XML file in JavaScript

7:10 PM No Comments

As one of reader asked about how to handle XML respone if we get more than records or if your XML file have many child nodes.I gave here one complete example with XML file and JavaScript in JSP.1. abc.xml<Students><Student><Name>Binod Kumar Suman</Name><Hostel>Ganga</Hostel><Contact>999999999</Contact></Student><Student> <Name>Pramod Kumar Modi</Name><Hostel>Godawari</Hostel><Contact>88888888</Contact></Student><Student><Name>Sanjay...

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JSON an easy example, get start with JSON, how to use JSON

7:10 PM No Comments

JSON : JavaScript Ojbect Notation.It contains name/value pairs, array and other object for passing aroung ojbect in java script. It is subset of JavaScript and can be used as object in javascript.You can use JSON to store name/value pair and array of ojbect.It has eval() method to assign value to variable.In below example, I have put all things together.Just make one html file and you can start your practice on it.How to use this tutorial:1. Make one file JSONDemo.html2. And paste below code<html><head><body><script language="javascript">eval("var...

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How to setup JNDI for Postgres SQL Database in RAD (Rational Application Development)

7:09 PM No Comments

How to setup JNDI in RAD (Rational Application Development)1. Start the server2. Run Administrative console3. Resource -> JDBC Provider -> Select the database type (User-defined) -> Select the provider type (User-defined JDBC Provider) -> Select the implementation type (User-defined)4. Name : jndipostgresql5. Class path: c:\jar\postgresql-8.1dev-403.jdbc2ee.jar6. Native library path : c:\jar\postgresql-8.1dev-403.jdbc2ee.jar7. Implementation class name : org.postgresql.jdbc2.optional.ConnectionPoolApply8. Click on Data sources,...

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How to get client and server IP address in JSP page

7:08 PM 2 Comments

Some time we have to show the server IP address on JSP page and some time we need to store client IP address to next visit purpose.Using very few lines of code, you can get both server side and client side (browsing) IP address.GetIPAddress.jsp<h3> Server Side IP Address </h3><br><%@page import="java.net.InetAddress;" %><%String ip = "";InetAddress inetAddress = InetAddress.getLocalHost();ip = inetAddress.getHostAddress();out.println("Server Host Name :: "+inetAddress.getHostName());%><br><%out.println("Server...

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Get Current Server Time on Client JSP Page using Ajax

7:08 PM No Comments

Using AJAX, you can show the server current time on client page. Time would be update on every second. Even you can set the interval of fetching time from server.For example I am showing one jsp page and servlet.To use this tutorial, no need to download any jar file or extra files.Just make one dynamic web project and use this jps and servlet file.1. ShowServerTime.jsp<html><head><title>Binod Java Solution AJAX </title><script type="text/javascript">var request;function init(){window.setInterval("getTime()",1000);}function...

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How to show Image on Pop Up Window using Servlet

7:05 PM 1 Comment

When you want to show the image on pop up using JSP from your local drive, then you will feel the problem. Actually you can not show any file from local drive in pop up due to security reason. Then you have the servlet option to show the image on pop up window from local drive location.I am giving step by step solution:1. create one servlet MyServletImage.javaimport java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.OutputStream;import javax.servlet.Servlet;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import...

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How to make servlet for dowload image option

7:05 PM No Comments

Suppose you have to write one serlvet, who would be give the download the image as save or open option.This servelt should pick up the image as per the URL parameter from local drive and give the option of save or option image on your disk.1. Make one Servlet SendImageimport javax.servlet.RequestDispatcher;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class SendImage extends javax.servlet.http.HttpServlet...

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How to get Height and Widht of an Image using JavaScript

7:00 PM No Comments

I got one problem during my project development. When I click on thumbnails to show image in pop up window, it does not appear in first click but on the second click it works. It only does work when the image exist is browser cache. And we had to show image on sigle click as per the client requirement. I got the solution and want to share with all of you. :)Second requirement is that if image aspect ration is greater than 500 then reduce to 500.<script type="text/javascript" language="javascript1.2">var imgHeight;var imgWidth;function...

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How to read Excel file using Java (.xls extension)

6:59 PM 1 Comment

This tutorial will work only for Excel .xls (MS 2003) extension ** 1. Download jexcelapi jxl.jar from here. This download contain full project, just take the jxl.jar file and put in your workspace.2. Create one excel file say Binod.xls and put some data.3. Write ExcelReader.java and put ExcelReader.java and Binod.xls both file is same folder.ExcelReader.javaimport java.io.File;import java.io.IOException;import jxl.Cell;import jxl.CellType;import jxl.Sheet;import jxl.Workbook;import jxl.read.biff.BiffException;public class ExcelReader {public static...

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How to read Excel file in Java using HSSF Jakarta POI

6:58 PM 1 Comment

There are many way to read excel files in java1. Using jexcelapi API that explained in previous post. (Only for .xls extenstion)2. Using HSSF Jakarta POI, that will explain in this posting. (Only for .xls extenstion)STEP1: Download poi-3.0-FINAL.jar from jakarta site or here.SETP2: Write one Excel file say Binod2.xlsSETP3: Write ReadExcelFile.javaBoth excel and java file should be in the same folder. Put poi-3.0-FINAL.jar in workspace.ReadExcelFile.javaimport org.apache.poi.hssf.usermodel.*;import java.io.*;import java.util.*;public class ReadExcelFile...

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JMS easy example in RAD, Get started with JMS on RAD

6:55 PM No Comments

This tutorial is based on RAD (Rational Architect Development) that uses the WebShpere Application Server V6.0.1. start the server and go to admin console2. Service Integration -> Buses -> New -> Give Name: BinodBus -> Apply -> save -> save3. click on BinodBus -> In Additional Properties Section, click on Bus Member -> Next -> Finsh -> Save -> save4. Again click on BinodBus -> In Additional Properties Section, click on Destination -> check Queue Type present or not. Ifnot present then click on New ->...

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JMS easy example, Get start with JMS, JMS tutorial, JMS easy code

6:55 PM 1 Comment

JMS : Java Messaging Service I was searching an easy and running example on JMS, but could not. I saw in many tutorial they explained in very hard manner to how to setup the administrative object to run the JSM example. But in real it is very easy. Here I am using IBM Rational Software Architect (RSA) as Java IDE and WebSphere Application Server V6.1 that comes with RSA. [ Image Source ] NOTE : If you want to execute this tutorial on RAD [IBM Rational Architect Developer] IDE then plesae click...

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How to run java class using ant script, getting started with ANT, ANT easy example with java

6:51 PM No Comments

It is very easy to compile and run any java file using ANT Script.1. Write one build.xml (Ant Sciprt)2. Write one java file First.java3. Ant jar file should in classpath4. Java compiler should also in classpathFirst.java (C:\AntExample\src\First.java)public class First {public static void main(String[] args) {System.out.println("Fist Data :: "+args[0]);System.out.println("Second Data :: "+args[1]);}}build.xml (C:\AntExample\build.xml)<?xml version="1.0" encoding="UTF-8"?><project name="check" basedir="." default="execute"><property...

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How to parse XML file in ANT Script, read xml file in Ant, how to use

6:50 PM No Comments

Some time we need to parse xml file using Ant script to run the java file or read some property value and more like this.It is very easy, we can do this with tag called <xmlproperty>. This tag loads the xml file and it convert all the values of xml file in ant property value internally and we can use those value as ant property. For example :<root><properties><foo>bar</foo></properties></root>is roughly equivalent to this into ant script file as:<property name="root.properties.foo" value="bar"/>...

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How to read an XML file and extract values for the attributes using ANT script, XML Manipulation using XMLTask, XMLTASK example, Parse XML file in ANT

6:49 PM No Comments

Parse XML file in ANT using XMLTASK1. Write one ant script (xmlRead.xml)2. Write one xml fiel (tests2.xml)3. Download jar file (xmltask-v1.15.1.jar) from here and put in lib folder (c:\xmltask\lib)1. xmlRead.xml (c:\xmltask\src)<?xml version="1.0" encoding="UTF-8"?><project name="ReadXML" default="readXML"><path id="build.classpath"><fileset dir="lib"><include name="xmltask-v1.15.1.jar" /></fileset></path><taskdef name="xmltask"classname="com.oopsconsultancy.xmltask.ant.XmlTask"classpathref="build.classpath"...

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AJAX Program for Firefox, Ajax does not work with Firefox, Ajax not working in firefox but works with IE, Ajax for Mozilla

6:48 PM No Comments

There are many questions are floating on internet that AJAX code doesnot work for Mozilla FireFox. And interesting there is no such exact solution for this. Some days back I have also posted one article on my blog regarding one simple tutorial on Ajax and it was very fine with IE. One day I got one comment that my tutorial is not working for Firefox. I asked this question to one of my friend and she gave the solution.Complete Example:[Please follow my prior posting to setup this tutorial]1. ShowStudentInfo.jsp (C:\Ajax_workspace\blog_demo\WebContent\ShowStudentInfo.jsp)2....

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How to make Zip file using Java, Creating a ZIP file in Java

6:39 PM No Comments

To run this tutorial1. Create one folder src2. Put test1.txt and test2.txt in src folder.3. After run this code, you will get myZip.zip file in src folder.import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;public class MakeZip {public static void main(String[] args) {String[] filesToZip = {"src\\test1.txt","src\\test2.txt"};//String[] filesToZip = {"src\\test1.txt"};String ZipedFileName = "src\\myZip.zip";zipConversion(filesToZip, ZipedFileName);}public...

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Get contents of a ZIP file in Java, how to get file names in zip file in java

6:39 PM No Comments

import java.io.File;import java.io.IOException;import java.util.Enumeration;import java.util.zip.ZipFile;public class ZipContents {public static void main(String[] args) {File zipFileName = new File("src\\myZip.zip");getContentsInZip(zipFileName);}public static void getContentsInZip(File zipFileName){try{ ZipFile zipFile = new ZipFile(zipFileName);Enumeration em = zipFile.entries();for (Enumeration enumer = zipFile.entries(); enumer.hasMoreElements();) {System.out.println(enumer.nextElement());}}catch(IOException e){ e.printStackTrace(); }}...

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how to unzip file in java; Java Unzip file,

6:38 PM No Comments

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;public class MakeUnZip {public static void main(String argv[]) {String zipFileName = "src\\myZip.zip";unZip(zipFileName);}public static void unZip(String zipFileName) {int BUFFER = 2048;try {BufferedOutputStream dest = null;FileInputStream fileInputStream = new FileInputStream(zipFileName);ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(fileInputStream));ZipEntry...

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How to get recursively listing all files in directory using Java

6:37 PM No Comments

import java.io.File;import java.io.FileNotFoundException;import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;import java.util.List;public class AllFilesInFolder {public static void main(String[] args) throws FileNotFoundException {String folderName = "C:\\temp";List<String> fileNames = getAllFiles(folderName);System.out.println("All Files :: " + fileNames);}public static List<String> getAllFiles(String folderName) throws FileNotFoundException {File aStartingDir = new File(folderName);List<File> result...

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How to delete recursively empty folder using java, Recursively Delete Empty Folders

6:37 PM No Comments

import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.util.ArrayList;import java.util.Arrays;import java.util.List;public class DeleteEmptyFolder {public static void main(String[] args) throws IOException {deleteEmptyFolders("C:\\temp");}public static void deleteEmptyFolders(String folderName) throws FileNotFoundException {File aStartingDir = new File(folderName);List<File> emptyFolders = new ArrayList<File>();findEmptyFoldersInDir(aStartingDir, emptyFolders);List<String> fileNames =...

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How to convert number to word in java, Number to Word

6:36 PM No Comments

Just use String().subString() method and you can develop java code to convert number to word. Like 12345678 toone Crore twenty three Lakh forty five thousand six hundred seventy eight.import java.text.DecimalFormat;public class NumberToWord {public static void main(String[] args) {System.out.println(convert(12345678));}private static final String[] tensNames = { "", " ten", " twenty", " thirty", " forty", " fifty", " sixty", " seventy", " eighty", " ninety" };private static final String[] numNames = { "", " one", " two", " three", " four", " five",...

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Spring Integration Messaging tutorial, Spring Integration in 10 Minutes

6:35 PM No Comments

There are many things in Spring Integration:1. Messaging2. Routing3. Mediation4. Invocation5. CEP (Complex Event Processing)6. File Transfer7. Shared database8. Remote Procedure callHere I am posting Spring Integration Messaging (Kind of JMS) example here:Create one project in Eclipse say SpringIntegrationDemo and add these below jar file to that project:1. spring-core-3.0.5.RELEASE.jar2. spring-integration-core-2.0.0.BUILD-SNAPSHOT.jar3. jar/commons-logging-1.1.jar4. spring-context-3.0.5.RELEASE.jar5. spring-beans-3.0.5.RELEASE.jar6. spring-asm-3.0.5.RELEASE.jar7....

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Spring RowMapper Example, Use of RowMapper, RowMapper Tutorial, jdbcTemplate Example with RowMapper

6:33 PM No Comments

Interface RowMapper:org.springframework.jdbc.core.RowMapperAn interface used by JdbcTemplate for mapping rows of a ResultSet on a per-row basis. Implementations of this interface perform the actual work of mapping each row to a result object. One very useful thing is that you can collect all the column of one recrod into java collection.public class Student {  private Map data = new HashMap();  int roll;}Means, all the data will be there in map and only one primary column be there outside.Example here:Student.javapackage binod.suman.rowmapper.domain;import...

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