.

Read XML Taglib and JSTL in JSP

samle.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<weather ver="2.0">
<loc id="INXX0096">
<dnam>New Delhi, India </dnam>
<tm>3:30 PM </tm>
</loc>
<cc>
<tmp>75 </tmp>
<bar>
<r>29.94 </r>
<d>steady </d>
</bar>
</cc>
</weather>

--------------------------------
xml_read.jsp

<%@ page contentType="text/html; charset=iso-8859-1" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>
<c:import url="http://localhost:8080/XML/samle.xml" var="xml"/>
<x:parse xml="${xml}" varDom="dom"/>
<html>
<head>
<title>Read XML through taglib JSTL</title>
</head>

<body>
<x:forEach select="$dom/weather/cc/tmp" var="tmp">
<x:out select="$tmp" />
</x:forEach>

<br>

<x:forEach select="$dom/weather/cc/bar/d" var="d">
<x:out select="$d" />
</x:forEach>
</body>
</html>

How to read XML file in java

books.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<library>
<book>
<name>Head First Java, 2nd Edition</name>
<author>Kathy Sierra and Bert Bates</author>
<publication-date>09-Feb-2005</publication-date>
</book>
<book>
<name>Effective Java</name>
<author>Joshua Bloch</author>
<publication-date>28-May-2008</publication-date>
</book>
<book>
<name>Java How to Program, 7th Edition</name>
<author>Harvey M. Deitel and Paul J. Deitel</author>
<publication-date>6-Jan-2007</publication-date>
</book>
</library>

------------------------------------------------------------
readDOMXML.jsp

<%@ page language="java" %>
<%@ page import="org.w3c.dom.*" %>
<%@ page import="javax.xml.parsers.DocumentBuilder" %>
<%@ page import="javax.xml.parsers.DocumentBuilderFactory" %>
<%
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
DocumentBuilder db =dbf.newDocumentBuilder();
Document doc=db.parse("c:\\books.xml");

NodeList nl = doc.getElementsByTagName("book");

%>
<html>
<head>
<title>How to read XML file in JAVA</title>
</head>
<body>
<%

for(int i=0;i<nl.getLength();i++)
{
NodeList nameNlc= doc.getElementsByTagName("name");
Element nameElements=(Element)nameNlc.item(i);
String nameTagValue=nameElements.getChildNodes().item(0).getNodeValue();

NodeList authorNlc= doc.getElementsByTagName("author");
Element authorElements=(Element)authorNlc.item(i);
String authorTagValue=authorElements.getChildNodes().item(0).getNodeValue();

NodeList dateNlc= doc.getElementsByTagName("publication-date");
Element dateElements=(Element)dateNlc.item(i);
String dateTagValue=dateElements.getChildNodes().item(0).getNodeValue();

out.println("name :"+nameTagValue+"<br>");
out.println("author :"+authorTagValue+"<br>");
out.println("publication-date :"+dateTagValue+"<br><br>");
}

%>

</body>
</html>

getElementsByTagName in javascript

<html>
<head>
<title>getElementsByTagName Javascript</title>
<script>
function getElementFtn()
{
alert(document.getElementsByTagName("p").item(0).innerHTML)
}
</script>
</head>

<body>
<p>this is first tag</p>

<p>this is second</p>

<p id="pID">this is third tag</p>

<p>this is forth tag</p>

<p>this is fifth tag</p>

<a href="javascript:getElementFtn()">check this element</a>
</body>
</html>

Form parameter validation using javascript(username,password,email,number,alphanumeric))

UserName Password validation

<html>
<head>
<title>Required Validation</title>
<script>
function validate()
{
var vUser=trim(document.frm.sUser.value);
var vPwd=trim(document.frm.sPwd.value);

if(vUser=="")
{
alert("User Name Field is Empty");
document.frm.sUser.focus();
return false;
}
else if(vPwd=="")
{
alert("Password Field is Empty");
document.frm.sPwd.focus();
return false;
}
}

function trim(s) {
return s.replace( /^\s*/, "" ).replace( /\s*$/, "" );
}

</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
User Name <input type="text" name="sUser" /><br>
Password <input type="password" name="sPwd" /><br>
<input type="submit" name="goTo" value="Submit"/>
</form>
</body>
</html>

----------------------------------------------------------------
Number or Integer Validation

<html>
<head>
<title>Number Integer Validation</title>
<script>

function validate()
{
var dValidate=document.frm.numberValidate.value;
if(dValidate=="")
{
alert("Number Field is empty")
return false;
}
else if(isDigits(dValidate)==false)
{
alert("Field is not numeric")
return false;
}
}

function isDigits(argvalue) {
argvalue = argvalue.toString();
var validChars = "0123456789";
var startFrom = 0;
if (argvalue.substring(0, 2) == "0x") {
validChars = "0123456789abcdefABCDEF";
startFrom = 2;
} else if (argvalue.charAt(0) == "0") {
validChars = "01234567";
startFrom = 1;
}
for (var n = 0; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1) return false;
}
return true;
}
</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
Number <input type="text" name="numberValidate" />
<input type="submit" name="goTo" value="Number Validate" />
</form>
</body>
</html>

------------------------------------------------------------------
Date Validation

<html>
<head>
<title>Date Validation</title>
<script>
function validate()
{
var dValidate=document.frm.dateValidate.value;
if(dValidate!="")
{
var arDValidate=dValidate.split("/");
if(arDValidate.length==3)
{
if(arDValidate[0].length!=2 || (arDValidate[0]>32))
{
alert("Wrong Date format");
return false;
}
else if(arDValidate[1].length!=2 || (arDValidate[1]>13))
{
alert("Wrong Month format");
return false;
}
else if(arDValidate[2].length!=4 || (arDValidate[2]<1900))
{
alert("Wrong Year format");
return false;
}
else
{
var dateDate=new Date(arDValidate[2],arDValidate[1]-1,arDValidate[0]);
if((arDValidate[0]!=dateDate.getDate()))
{
alert("Wrong Date Enter e.g date month year is not correct 31 feb 2009");
return false;
}
}
}
else
{
alert("Wrong Format");
return false;
}
}
else
{
alert("Date is blank");
return false;
}
}

</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
mm/dd/yyyy <input type="text" name="dateValidate" />
<input type="submit" name="goTo" value="Date Validate" />
</form>
</body>
</html>

-------------------------------------------------------------------
Email Validation

<html>
<head>
<title>Email Validation</title>
<script>
function validate()
{
var dValidate=document.frm.emailValidate.value;
if(dValidate=="")
{
alert("Email Field is empty")
return false;
}
else if(checkEmail(dValidate)==false)
{
alert("Email Format is not correct")
return false;
}
}

function checkEmail(emailStr) {
if (emailStr.length == 0) {
return true;
}
var emailPat=/^(.+)@(.+)$/;
var specialChars="\$\$<>@,;:\\\\\\\"\\.\\[\\]";
var validChars="\[^\\s" + specialChars + "\]";
var quotedUser="(\"[^\"]*\")";
var ipDomainPat=/^(\d{1,3})[.](\d{1,3})[.](\d{1,3})[.](\d{1,3})$/;
var atom=validChars + "+";
var word="(" + atom + "|" + quotedUser + ")";
var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
var domainPat=new RegExp("^" + atom + "(\\." + atom + ")*$");
var matchArray=emailStr.match(emailPat);
if (matchArray == null) {
return false;
}
var user=matchArray[1];
var domain=matchArray[2];
if (user.match(userPat) == null) {
return false;
}
var IPArray = domain.match(ipDomainPat);
if (IPArray != null) {
for (var i = 1; i <= 4; i++) {
if (IPArray[i] > 255) {
return false;
}
}
return true;
}
var domainArray=domain.match(domainPat);
if (domainArray == null) {
return false;
}
var atomPat=new RegExp(atom,"g");
var domArr=domain.match(atomPat);
var len=domArr.length;
if ((domArr[domArr.length-1].length < 2) ||
(domArr[domArr.length-1].length > 3)) {
return false;
}
if (len < 2) {
return false;
}
return true;
}
</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
Email <input type="text" name="emailValidate" />
<input type="submit" name="goTo" value="Email Validate" />
</form>
</body>
</html>

------------------------------------------------------------------
Alpha Character Validation

<html>
<head>
<title>Alpha number Validation</title>
<script>

function validate()
{
var dValidate=document.frm.alphaValidate.value;
if(dValidate=="")
{
alert("Alpha Field is empty")
return false;
}
else if(isAlpha(dValidate)==false)
{
alert("Field is not alpha character")
return false;
}
}

function isAlpha(argvalue) {
argvalue = argvalue.toString();
var validChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

for (var n = 0; n < argvalue.length; n++) {
if (validChars.indexOf(argvalue.substring(n, n+1)) == -1)
return false;
}
return true;
}
</script>
</head>

<body>
<form name="frm" onSubmit="return validate();">
Alpha Character <input type="text" name="alphaValidate" />
<input type="submit" name="goTo" value="Alpha Validate" />
</form>

</body>
</html>

Enable Disable Radio button Text box in JavaScript

<html>
<head>
<title>Enable Disable Radio button Text box in javascript</title>
</head>
<script>
function chMd()
{
// initialize form with empty field
document.forms[0].sTextBox.disabled=false;
document.forms[0].sTextBox.value="";

document.forms[0].eTextBox.disabled=false;
document.forms[0].eTextBox.value="";

document.forms[0].goServer.disabled=false;

for(var i=0;i<document.forms[0].elements.length;i++)
{
if(document.forms[0].elements[i].name=="dOption")
{
if(document.forms[0].elements[i].value=="N")
{
if(document.forms[0].elements[i].checked==true){

document.forms[0].sTextBox.disabled=true;
document.forms[0].eTextBox.disabled=true;

document.forms[0].sRadio[0].disabled=true;
document.forms[0].sRadio[1].disabled=true;
document.forms[0].sRadio[2].disabled=true;

document.forms[0].goServer.disabled=true;
}
}
else if(document.forms[0].elements[i].value=="T")
{
if(document.forms[0].elements[i].checked==true){
document.forms[0].sTextBox.disabled=false;
document.forms[0].eTextBox.disabled=false;

document.forms[0].sRadio[0].disabled=true;
document.forms[0].sRadio[1].disabled=true;
document.forms[0].sRadio[2].disabled=true;

document.forms[0].goServer.disabled=false;
}
}
else if(document.forms[0].elements[i].value=="R")
{
if(document.forms[0].elements[i].checked==true){
document.forms[0].sTextBox.disabled=true;
document.forms[0].eTextBox.disabled=true;

document.forms[0].sRadio[0].disabled=false;
document.forms[0].sRadio[1].disabled=false;
document.forms[0].sRadio[2].disabled=false;

document.forms[0].goServer.disabled=false;
}
}
}
}
}
</script>

<body>
<form name="fRadio">
<input name="dOption" value="N" checked="checked" onClick="chMd()" type="radio">
No Constraints <br />

<input name="dOption" value="T" onClick="chMd()" type="radio"> Text Box

<input name="sTextBox" size="10" disabled="disabled" type="text">
<input name="eTextBox" size="10" disabled="disabled" type="text"> <br/>

<input name="dOption" value="R" onClick="chMd()" type="radio"> Radio Button
Radio A <input name="sRadio" value="A" disabled="disabled" type="radio">
Radio B <input name="sRadio" value="B" disabled="disabled" type="radio">
Radio C <input name="sRadio" value="C" disabled="disabled" type="radio"> <br/>
<input name="goServer" value="Go" disabled="disabled" type="button">
</form>
</body>
</html>

Selecting all checkboxes using javascript

<html>
<head>
<title>JavaScript - Select All checkbox in form</title>
<script>
var fieldName='chkName';

function selectall(){
var i=document.frm.elements.length;
var e=document.frm.elements;
var name=new Array();
var value=new Array();
var j=0;
for(var k=0;k<i;k++)
{
if(document.frm.elements[k].name==fieldName)
{
if(document.frm.elements[k].checked==true){
value[j]=document.frm.elements[k].value;
j++;
}
}
}
checkSelect();
}
function selectCheck(obj)
{
var i=document.frm.elements.length;
for(var k=0;k<i;k++)
{
if(document.frm.elements[k].name==fieldName)
{
document.frm.elements[k].checked=obj;
}
}
selectall();
}

function selectallMe()
{
if(document.frm.allCheck.checked==true)
{
selectCheck(true);
}
else
{
selectCheck(false);
}
}
function checkSelect()
{
var i=document.frm.elements.length;
var berror=true;
for(var k=0;k<i;k++)
{
if(document.frm.elements[k].name==fieldName)
{
if(document.frm.elements[k].checked==false)
{
berror=false;
break;
}
}
}
if(berror==false)
{
document.frm.allCheck.checked=false;
}
else
{
document.frm.allCheck.checked=true;
}
}
</script>
</head>

<body>
<form name="frm">
select all :<input type="checkbox" name="allCheck" onClick="selectallMe()">
<hr><br>
1 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
2 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
3 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
4 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
5 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
6 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
7 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
8 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
9 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
10 :<input type="checkbox" name="chkName" onClick="selectall()"><br>
</form>
</body>
</html>

Get Checkbox Value using javascript

<html>
<head>
<title>JavaScript select checkbox</title>
<script>
function selectCheckBox()
{
var e= document.frm.elements.length;
var cnt=0;

for(cnt=0;cnt<e;cnt++)
{
if(document.frm.elements[cnt].name=="id"){
alert(document.frm.elements[cnt].value)
}
}
}
</script>
</head>

<body>
<form name="frm">
<input type="checkbox" name="id" value="1">
<input type="checkbox" name="id" value="2">
<input type="checkbox" name="id" value="3">
<input type="checkbox" name="id" value="4">
<input type="checkbox" name="id" value="5">
<input type="button" name="goto" onClick="selectCheckBox()" value="Check">
</form>
</body>
</html>

The example is showing how to get value from separate name checkbox in JavaScript.

<html>
<head>
<title>JavaScript select checkbox</title>
<script>
function selectCheckBox()
{
alert(document.frm.id1.value)
alert(document.frm.id2.value)
alert(document.frm.id3.value)
}
</script>
</head>

<body>
<form name="frm">
<input type="checkbox" name="id1" value="1">
<input type="checkbox" name="id2" value="2">
<input type="checkbox" name="id3" value="3">

<input type="button" name="goto" onClick="selectCheckBox()" value="Check">
</form>
</body>
</html>

More than one form in HTML page

Confirm function in Javascript

<html>
<head>
<title>Confirm javascript</title>
<script>
function validate()
{
var confirmMessage="Are you sure to move Yahoo home page!";

if(confirm(confirmMessage)==false)
{
return false;
}
}
</script>
</head>

<body>
<form name="frm" action="http://yahoo.com" onSubmit="return validate()">
<input type="submit" name="goSubmit" value="Submit" />
</form>
</body>
</html>

Calling href using JavaScript

<html>
<head>
<title>Calling JavaScript Href</title>
<script>
function callHref()
{
alert("Function is called from Href");
}
</script>
</head>

<body>
<a href="javascript:callHref()">Calling JavaScript Href </a>
</body>
</html>

How to Submit a Form Using JavaScript

<html>
<head>
<title>Submit form using javascript</title>
<script>
function goSubmit()
{
document.frm.submit();
}
</script>
</head>

<body>
<form name="frm">
<a href="javascript:goSubmit()">Submit form </a>
<br>
<input type="button" name="btn" value="Submit" onClick="goSubmit()">
</form>
</body>
</html>

How to get day month year in date

import java.util.Calendar;

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

Calendar ca1 = Calendar.getInstance();

/// get day month year from set date
ca1.set(2009, 05, 15); // dont set this date if current date is required

int iDay=ca1.get(Calendar.DATE);
int iMonth=ca1.get(Calendar.MONTH); // In Current date Add 1 in month
int iYear=ca1.get(Calendar.YEAR);

System.out.println("Day :"+iDay);
System.out.println("Month :"+iMonth);
System.out.println("Year :"+iYear);
}
}

How to find Week of Year

import java.util.Calendar;

public class WeekOfYear {

public static void main(String[] args) {

Calendar ca1 = Calendar.getInstance();

/*
set(int year, int month, int date)
Jan=0,Feb=1,Mar=2...
*/
ca1.set(2009,4,22);

int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);

System.out.println("WEEK OF YEAR :"+WEEK_OF_YEAR);
}
}

How to get Day of Week in Month

import java.util.Calendar;

public class DayOfWeekInMonth {

public static void main(String[] args) {

Calendar ca1 = Calendar.getInstance();

ca1.set(2009, 6, 22);

int DAY_OF_WEEK_IN_MONTH=ca1.get(Calendar.DAY_OF_WEEK_IN_MONTH);

// More Calendar Date option can check
/*
int DAY_OF_MONTH=ca1.get(Calendar.DAY_OF_MONTH);
int DAY_OF_WEEK=ca1.get(Calendar.DAY_OF_WEEK);
int DAY_OF_YEAR=ca1.get(Calendar.DAY_OF_YEAR);
int WEEK_OF_MONTH=ca1.get(Calendar.WEEK_OF_MONTH);
int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);
*/

System.out.println("DAY OF WEEK IN MONTH :"+DAY_OF_WEEK_IN_MONTH);
}
}

How to Add or Subtract Date

import java.util.Calendar;

public class AddDate {

    public static void main(String[] args) {

    Calendar ca1 = Calendar.getInstance();
    ca1.set(2009,05,25);

    // Addition of date in java        
    ca1.add(Calendar.DATE, 23); // Add 23 days in Dates in Calendar
    //ca1.add(Calendar.MONTH, 2); // Add 2 Month in Date in Calendar
    //ca1.add(Calendar.YEAR, 4); // Add 4 Year in Date in Calendar

    /*
     *  Subtracting Date in Calendar
     *  
     *  ca1.add(Calendar.DATE, -23); // Subtracting 23 days from date
     *  //ca1.add(Calendar.MONTH, -2); // Subtracting 2 Month in Date in Calendar
     *  //ca1.add(Calendar.YEAR, -4); // Subtracting 4 Year in Date in Calendar
     */

    System.out.println("Date :"+ca1.get(Calendar.DATE));
    System.out.println("Month :"+ca1.get(Calendar.MONTH));
    System.out.println("Year :"+ca1.get(Calendar.YEAR));
    }
}

find Week of Month in java

import java.util.Calendar;

public class WeekOfMonth {

public static void main(String[] args) {
Calendar ca1 = Calendar.getInstance();

/*
set(int year, int month, int date)
Jan=0,Feb=1,Mar=2...
*/
ca1.set(2009,4,22);

int WEEK_OF_MONTH=ca1.get(Calendar.WEEK_OF_MONTH);
System.out.println("Week of Month :"+WEEK_OF_MONTH);

// More Calendar Date option can check
/*
int DAY_OF_MONTH=ca1.get(Calendar.DAY_OF_MONTH);
int DAY_OF_WEEK=ca1.get(Calendar.DAY_OF_WEEK);
int DAY_OF_YEAR=ca1.get(Calendar.DAY_OF_YEAR);
int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);
*/
}
}

find Day of Year in Java

import java.util.Calendar;

public class DayOfYear {

public static void main(String[] args) {
Calendar ca1 = Calendar.getInstance();

/*
set(int year, int month, int date)
Jan=0,Feb=1,Mar=2...
*/
ca1.set(2009,4,22);

/*
2 Feb 2009, Day of Year, Jan 31 + 2 Feb =33 day of year
*/

int DAY_OF_YEAR=ca1.get(Calendar.DAY_OF_YEAR);
System.out.println("Day of Year :"+DAY_OF_YEAR);

// More Calendar Date option can check
/*
int DAY_OF_MONTH=ca1.get(Calendar.DAY_OF_MONTH);
int DAY_OF_WEEK=ca1.get(Calendar.DAY_OF_WEEK);
int WEEK_OF_MONTH=ca1.get(Calendar.WEEK_OF_MONTH);
int WEEK_OF_YEAR=ca1.get(Calendar.WEEK_OF_YEAR);
*/
}
}

How to Create file in Java

import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;

public class JavaIOWriteFileExample {

public static void main(String[] args) {

File f=new File("c:\\createNewfile.txt");

try{
FileWriter fstreamCopy = new FileWriter(f);
BufferedWriter outobjCopy = new BufferedWriter(fstreamCopy);
outobjCopy.write("The content write to inside the file");
outobjCopy.close();
}
catch (Exception e){
e.printStackTrace();
}
}
}

SortedSet Example

import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;

public class SortedSetExample {

public static void main(String[] args) {

SortedSet<String> ss=new TreeSet<String>();

ss.add("a");
ss.add("e");
ss.add("g");
ss.add("b");
ss.add("c");

Iterator it=ss.iterator();

while(it.hasNext())
{
String value=(String)it.next();

System.out.println("Value :"+value);
}
}
}

Remove elements from SortedMap

import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

public class SortedMapRemoveExample {

public static void main(String[] args) {

SortedMap<Integer,String> sm=new TreeMap<Integer, String>();

sm.put(new Integer(2), "Two");
sm.put(new Integer(1), "One");
sm.put(new Integer(4), "Four");
sm.put(new Integer(3), "Three");
sm.put(new Integer(5), "Five");

// SortedMap remove object
sm.remove(new Integer(4));

Set s=sm.entrySet();

Iterator i=s.iterator();

while(i.hasNext())
{
Map.Entry m =(Map.Entry)i.next();

int key = (Integer)m.getKey();
String value=(String)m.getValue();

System.out.println("Key :"+key+" value :"+value);
}
}
}

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Read XML Taglib and JSTL in JSP

How to read XML file in java

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