JavaOriented: November 2013

Tuesday, 26 November 2013

Conversions into Different Formats

Date Conversion:

public Date stringToDate(String dateString) throws ParseException {
        if (dateString.trim() == null || "".equalsIgnoreCase(dateString.trim())) {
            return null;
        } else {
            java.util.Date date = null;
            date = new SimpleDateFormat("MM/DD/yyyy", Locale.ENGLISH)
                    .parse(dateString);
            return new Date(date.getTime());
        }
    }

String to Float Conversion :

    public float stringToFloat(String value) throws ParseException {
        String sValue = value.trim();
        sValue = sValue.replaceAll(",", "");
        float returnValue = 0;
        if (sValue == null || "".equalsIgnoreCase(sValue)) {
            return returnValue;
        } else {
            returnValue = Float.parseFloat(sValue);
            return returnValue;
        }
    }

String to Double Conversion:

public double stringToDouble(String value) throws ParseException {
        String sValue = value.trim();
        sValue = sValue.replaceAll(",", "");
        double returnValue = 0;
        if (sValue == null || "".equalsIgnoreCase(sValue)) {
            return returnValue;
        } else {
            returnValue = Double.parseDouble(sValue);
            return returnValue;
        }
    }

Monday, 25 November 2013

Browser Compatible Issues & Script issues solutions

Z-index:

Adding z-index:

The first example, Stacking without z-index, explains how stacking is arranged by default. If you want to specify a different stacking order, you have to position an element and use the z-index property.

This property is assigned with an integer value (positive or negative), which represents the position of the element along the z-axis. If you are not familiar with the z-axis, imagine the page has several layers one above the other. Each layer is numbered. A layer with a greater number is rendered above layers with smaller numbers.

Warning! z-index only has an effect if an element is positioned.

bottom: furthest from the observer
...
Layer -3
Layer -2
Layer -1
Layer 0 default rendering layer
Layer 1
Layer 2
Layer 3
...
top: closest to the observer

Notes:

When no z-index property is specified, elements are rendered on the default rendering layer 0 (zero).
If several elements share the same z-index value (i.e. they are placed on the same layer), stacking rules explained in the section Stacking without z-index apply.

In the next example, the layers' stacking order is rearranged using z-index. The z-index of DIV#5 has no effect since it is not a positioned element.

Example source code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

div {

opacity: 0.7;

font: 12px Arial;

}

span.bold { font-weight: bold; }

#normdiv {

z-index: 8;

height: 70px;

border: 1px dashed #999966;

background-color: #ffffcc;

margin: 0px 50px 0px 50px;

text-align: center;

}

#reldiv1 {

z-index: 3;

height: 100px;

position: relative;

top: 30px;

border: 1px dashed #669966;

background-color: #ccffcc;

margin: 0px 50px 0px 50px;

text-align: center;

}

#reldiv2 {

z-index: 2;

height: 100px;

position: relative;

top: 15px;

left: 20px;

border: 1px dashed #669966;

background-color: #ccffcc;

margin: 0px 50px 0px 50px;

text-align: center;

}

#absdiv1 {

z-index: 5;

position: absolute;

width: 150px;

height: 350px;

top: 10px;

left: 10px;

border: 1px dashed #990000;

background-color: #ffdddd;

text-align: center;

}

#absdiv2 {

z-index: 1;

position: absolute;

width: 150px;

height: 350px;

top: 10px;

right: 10px;

border: 1px dashed #990000;

background-color: #ffdddd;

text-align: center;

}

</style></head>

<body>

<br />position: absolute;

<br />z-index: 5;

</div>

<br />position: relative;

<br />z-index: 3;

</div>

<br />position: relative;

<br />z-index: 2;

</div>

<br />position: absolute;

<br />z-index: 1;

</div>

<br />no positioning

<br />z-index: 8;

</div>

</body></html>

See also

Stacking without z-index : Default stacking rules
Stacking and float : How floating elements are handled
The stacking context : Notes on the stacking context
Stacking context example 1 : 2-level HTML hierarchy, z-index on the last level
Stacking context example 2 : 2-level HTML hierarchy, z-index on all levels
Stacking context example 3 : 3-level HTML hierarchy, z-index on the second level

Overlay issue:

Close button wont work Some time’s :

We need to change the javascript:parent.close() method to javascript:close();

Then it wont take parent object and it will close.

Print Button Implementation:

1. Take div for header and footer and content and for css also(what ever u want to print) and give id for the div’s.

2. Call the javascript method or Jquery method on keydown event for print, here we need to capture the ctrl+p event also using event key (if Required)

jQuery(document).keydown(function(event) {

//alert('ctrl+p');

if(event.ctrlKey && event.keyCode == 80) {

console.log("Hey! Ctrl+P event captured!");

event.preventDefault();

event.returnValue=false;

printCorePage();

}

});

3. First apply for css and apply for header and apply for content and apply for Footer.(content)

4. Using, document.getElementById(“idname”).innerHTML = content

5. If any content is not required then block the content.

Using, document.getElementById("printmenu").style.display = "none";

UI Tips:

Importing java file into jsp:

<%@page import="com.uboc.banking.bo.UserControl"%>

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

Importing tag-lib into jsp:

<%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles" %>

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

Prototype.js error :

Add jquery conflict code in jquery

$.noConflict();

($ depends upon jquery symbol)

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

Object expected: Script error

Import is missing for that variable, So import the required class

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

Object extected : Script error

Some time need to import the core matric's lib

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

To restrict the Hyperlinks in a page Code:

var div = document.getElementById("printableContentBlock");

var anchorList = div.getElementsByTagName('a');

for(var i = 0; i < anchorList.length; i++) {

anchorList[i].disabled = true;

anchorList[i].onclick = '';

anchorList[i].removeAttribute('href');

}

window.print();

window.close();

}

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

Object expected: script error in IE

ex: firstusageconfirmpayment.do

Solution: need to import the function implementation file

Ex: Tip is not defiend in FF

Solution: Need to import the below js file :

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

Script Error: "actualTitle" is null in FF

Object expected: script error in IE

1. Check the title of landing Page

2. And change the Title div id

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

Detect which browser our script is running

Detect which browser our script is running :

BrowserFinding.html:

<html>
<html>
<head>
<script>
function detectBrowser(){
var val = navigator.userAgent.toLowerCase();
if(val.indexOf("firefox") > -1)
{
alert("This is Firefox. Write Firefox code here........")
}
else if(val.indexOf("chrome") > -1)
{
alert("This is Google Chrome. Write Google Chrome code here.............")
}
else if(val.indexOf("opera") > -1)
{
alert("This is Opera. Write Opera code here..............")
}
else if(val.indexOf("msie") > -1)
{
alert("This is Internet Explorer. Write Internet Explorer code here..........")
}
else if(val.indexOf("safari") > -1)
{
alert("This is Safari. Write Safari code here..........")
}
};
window.onload=detectBrowser();
</script>
</head>
<body>
</body>
</html>

Output:

In IE :
This is Internet Explorer. Write Internet Explorer code here.........
In FF:
This is Firefox. Write Firefox code here.........
In Chrome:
This is Google Chrome. Write Google Chrome code here........

Reading the xml File and Loading into the database

There are so many ways to read the xml file. In that 2 ways here i am going to explain. i.e.
1. Reading the xml files using DOM Parser
2. Reading the xml files using SAX Parser

Difference Between DOM and SAX Parsers:

Parses node by node	Stores the entire XML document into memory before processing
Doesn’t store the XML in memory	Occupies more memory
We cant insert or delete a node	We can insert or delete nodes
Top to bottom traversing	Traverse in any direction.
SAX is an event based parser	DOM is a tree model parser
SAX is a Simple API for XML	Document Object Model (DOM) API
import javax.xml.parsers.; import org.xml.sax.; import org.xml.sax.helpers.*;	import javax.xml.parsers.; import org.w3c.dom.;
doesn’t preserve comments	preserves comments
SAX generally runs a little faster than DOM	SAX generally runs a little faster than DO

SAX Parser:

It’s an event based parsing it contains default handler for handling the events.
SAX parser pareses the xml document and it finds the Start tag “<” and end tag”>” it calls corresponding handler method.
Sample Example of reading XML File – SAX Parser

Advantage:

It is faster than DOM parser because it will not load the XML document into the memory .
Sax is an event based parser.

sample.xml:

<?xml version="1.0" encoding="UTF-8"?>
<Bank>
      <Account type="saving">
            <Id>1001</Id>
            <Name>Jack Robinson</Name>
            <Amt>10000</Amt>
      </Account>
      <Account type="current">
            <Id>1002</Id>
            <Name>Sony Corporation</Name>
            <Amt>1000000</Amt>
      </Account>
</Bank>

SampleVO.java

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

ReadXMLFileUsingSaxparser.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.

Tuesday, 26 November 2013

Conversions into Different Formats

Monday, 25 November 2013

Browser Compatible Issues & Script issues solutions

Detect which browser our script is running

Reading the xml File and Loading into the database

SpringBoot