JAVA BY RAMAKRISHNA

Tuesday, 17 September 2013

Spring web.xml with Listener,Without LIstener

Using Two configuration files with Listener

Eventhough we provided the name of applicationContext.xml,It will search for spring-servlet.xml,Here servlet-name is spring

ContextLoaderListener,it will get the configuration file(using contextConfigLocation) and create Spring contatiner object when the project is deployed into the server

Dispatcher servlet creating container object with another configuration file(xxx-servlet.xml)

Here xxx means spring(<servlet-name>spring</servlet-name>)

<web-app>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>

Using only one configuration file with Listener

Here Listener and DispatcherServlet both using spring-servlet.xml

<web-app>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>

Using One Configuration file without Listener

We can use init parameter also for giving configuration file name,this init-param is under DispatcherServlet

we no need to follow particular name(xxx-servlet.xml),we no need to place that configuration file in WEB-INF folder also

but in this way Spring Container object is created when the DispatcherServlet object is created

<web-app>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/Config/Congig.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

Saturday, 7 September 2013

Working with Date class in java,Converting String to Date

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

//This examples are used to take date in string format and stored in date object
public class DateExamples {

public static void main(String[] args) {

System.out.println("+++++++++++++++++++++++++++++++++");
//Just displaying today date in required format
DateFormat df = new SimpleDateFormat("dd/yy/MM");
String formattedDate = df.format(new Date());
System.out.println("TO DAY DATE IS:"+formattedDate);
System.out.println("+++++++++++++++++++++++++++++++++");
System.out.println("+++++++++++++++++++++++++++++++++");
//In this format only we have to give the date
SimpleDateFormat formatter = new SimpleDateFormat
("dd-MMM-yyyy");
String dateInString = "7-Jun-2013";

try {

Date date = formatter.parse(dateInString);
System.out.println(date);
System.out.println(formatter.format(date));

} catch (ParseException e) {
e.printStackTrace();
}
System.out.println("+++++++++++++++++++++++++++++++++");

System.out.println("+++++++++++++++++++++++++++++++++");
//In this format only we have to give the date
SimpleDateFormat formatter1 = new SimpleDateFormat
("dd/MM/yyyy");
String dateInString1 = "07/06/2013";

try {

Date date = formatter1.parse(dateInString1);
System.out.println(date);
System.out.println(formatter1.format(date));

} catch (ParseException e) {
e.printStackTrace();
}
System.out.println("+++++++++++++++++++++++++++++++++");

System.out.println("+++++++++++++++++++++++++++++++++");
//In this format only we have to give the date
SimpleDateFormat formatter2 = new SimpleDateFormat
("MMM dd, yyyy");
String dateInString2 = "Jun 7, 2013";

try {

Date date = formatter2.parse(dateInString2);
System.out.println(date);
System.out.println(formatter2.format(date));

} catch (ParseException e) {
e.printStackTrace();
}
System.out.println("+++++++++++++++++++++++++++++++++");

System.out.println("+++++++++++++++++++++++++++++++++");
//In this format only we have to give the date
SimpleDateFormat formatter3 = new SimpleDateFormat
("E, MMM dd yyyy");
String dateInString3 = "Fri, June 7 2013";

try {

Date date = formatter3.parse(dateInString3);
System.out.println(date);
System.out.println(formatter3.format(date));

} catch (ParseException e) {
e.printStackTrace();
}
System.out.println("+++++++++++++++++++++++++++++++++");

System.out.println("+++++++++++++++++++++++++++++++++");
//In this format only we have to give the date
SimpleDateFormat formatter4 = new SimpleDateFormat
("EEEE, MMM dd, yyyy HH:mm:ss a");
String dateInString4 = "Friday, Jun 7, 2013 12:10:56 PM";

try {

Date date = formatter4.parse(dateInString4);
System.out.println(date);
System.out.println(formatter4.format(date));

} catch (ParseException e) {
e.printStackTrace();
}
System.out.println("+++++++++++++++++++++++++++++++++");

System.out.println("+++++++++++++++++++++++++++++++++");
//In this format only we have to give the time
SimpleDateFormat formatter5 = new SimpleDateFormat
("HH:mm:ss a");
String dateInString5 = "12:10:56 PM";

try {

Date date = formatter5.parse(dateInString5);
//System.out.println(date);
System.out.println(formatter5.format(date));

} catch (ParseException e) {
e.printStackTrace();
}
System.out.println("+++++++++++++++++++++++++++++++++");

System.out.println("+++++++++++++++++++++++++++++++++");
//It just displaying current date and time in required format
SimpleDateFormat formatter6 = new SimpleDateFormat
("yyyy/MM/dd EEE,hh:mm::ss a");
System.out.println(formatter6.format(new Date()));

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

System.out.println("+++++++++++++++++++++++++++++++++");
//It just displaying current date and time in required format
SimpleDateFormat formatter7 = new SimpleDateFormat
("yyyy/MMMM/dd EEE,hh:mm::ss a");
System.out.println(formatter7.format(new Date()));

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

}

}

OUTPUT:

+++++++++++++++++++++++++++++++++
TO DAY DATE IS:07/13/09
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
Fri Jun 07 00:00:00 IST 2013
07-Jun-2013
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
Fri Jun 07 00:00:00 IST 2013
07/06/2013
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
Fri Jun 07 00:00:00 IST 2013
Jun 07, 2013
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
Fri Jun 07 00:00:00 IST 2013
Fri, Jun 07 2013
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
Fri Jun 07 12:10:56 IST 2013
Friday, Jun 07, 2013 12:10:56 PM
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
12:10:56 PM
++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++
2013/09/07 Sat,03:33::32 PM
+++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++
2013/September/07 Sat,03:33::32 PM
+++++++++++++++++++++++++++++++++

Spring MVC working Flow

By using URL/From jsp we are sending request

This request will come to web.xml file and execute DispatcherServlet

It is the responsibility of DispatcherServlet to identify perticular HandlerMappings

By using HandlerMapping DispathcerServlet will search for requested url path matching in spring configuration file/Spring Configuration class

If it is available,DispatcherServlet will call methods in our Controller

Controller process the request,get the data form form,store into pojo class/javabean,if required perform validations

And then Controller returns ModelAndView object with data/errors and jsp name

DispatcherServlet take the ModleAndView object and stored in scoped variables

Based on the jsp name returned by Controller,DispatcherServlet will find out jsp by using ViewResolver(InternalResourceViewResolver)

Finally loginpage/successpage/failure page send to clietnt/jsp/other

By using scoped variables we can display the data/errors

Wednesday, 14 August 2013

JQuery Dropdown List Example

JQuery Dropdown List Example
<html> <head> <script src="jquery.js"></script> <script> $(document).ready(function() { //To clear the selected item from the list $("#bt").click(function() { $("#selId option").attr("selected",false); }); //To get the value of selected item $("#bt1").click(function() { var temp=$("#selId option:selected").val(); alert(temp); }); //To get the text of selected item $("#bt2").click(function() { var temp=$("#selId option:selected").text(); alert(temp); }); //To get the index of selected item $("#bt3").click(function() { var temp=$("#selId option:selected").index(); alert(temp); }); }); </script> </head> <body> <select id="selId"> <option value="">---select---</option> <option value="java">JAVA</option> <option value="c">C</option> <option value="c++">C++</option> <option value="oracle">ORACLE</option> </select> <button id="bt">clear</button> <button id="bt1">selectedValue</button> <button id="bt2">selectedText</button> <button id="bt3">selectedIndex</button> </body> </html>

JQuery Dropdown List Example

<html>
<head>
<script src="jquery.js"></script>
<script>

$(document).ready(function() {
//To clear the selected item from the list
   $("#bt").click(function() {
     $("#selId option").attr("selected",false);
   });

//To get the value of selected item
   $("#bt1").click(function() {
     var temp=$("#selId option:selected").val();
     alert(temp);
   });

//To get the text of selected item
   $("#bt2").click(function() {
     var temp=$("#selId option:selected").text();
     alert(temp);
   });

//To get the index of selected item
   $("#bt3").click(function() {
     var temp=$("#selId option:selected").index();
     alert(temp);
   });

});

</script>
</head>
<body>
<select id="selId">
<option value="">---select---</option>
<option value="java">JAVA</option>
<option value="c">C</option>
<option value="c++">C++</option>
<option value="oracle">ORACLE</option>
</select>
<button id="bt">clear</button>
<button id="bt1">selectedValue</button>
<button id="bt2">selectedText</button>
<button id="bt3">selectedIndex</button>
</body>
</html>

Tuesday, 13 August 2013

JQuery Check box Example

JQuery Checkbox Example
<html> <head> <script src="jquery.js"></script> <script> $(document).ready(function() { $("#selectedValue").click(function() { var values=[]; $("input:checkbox[name=lang]:checked").each(function() { values.push($(this).val()); }); for(i=0;i<values.length;i++) { alert(values[i]); } }); $("#selectedText").click(function() { var values=[]; $("input:checkbox[name=lang]:checked").each(function() { values.push($(this).prev().text()); }); for(i=0;i<values.length;i++) { alert(values[i]); } }); $("#selectedIndex").click(function() { var values=[]; $("input:checkbox[name=lang]:checked").each(function() { values.push($(this).index()); }); for(i=0;i<values.length;i++) { alert(values[i]); } }); }); </script> </head> <body> <div> <label for="telugu">Telugu</label> <input type="checkbox" name="lang" value="telugu"/> <label for="english">English</label> <input type="checkbox" name="lang" value="english"/> <label for="hindi">Hindi</label> <input type="checkbox" name="lang" value="hindi"/> </div> <button id="selectedValue">Selected Value</button> <button id="selectedText">Selected text</button> <button id="selectedIndex">Selected index</button> </body> </html>

JQuery Checkbox Example

<html>
<head>
<script src="jquery.js"></script>
<script>
$(document).ready(function() {

$("#selectedValue").click(function() {
   var values=[];
   $("input:checkbox[name=lang]:checked").each(function() {
      values.push($(this).val());
   });
for(i=0;i<values.length;i++) {
   alert(values[i]);
}
});
$("#selectedText").click(function() {
   var values=[];
   $("input:checkbox[name=lang]:checked").each(function() {
      values.push($(this).prev().text());
   });
for(i=0;i<values.length;i++) {
   alert(values[i]);
}
});
$("#selectedIndex").click(function() {
   var values=[];
   $("input:checkbox[name=lang]:checked").each(function() {
      values.push($(this).index());
   });
for(i=0;i<values.length;i++) {
    alert(values[i]);
}
});
});
</script>
</head>
<body>
<div>
<label for="telugu">Telugu</label>
<input type="checkbox" name="lang" value="telugu"/>
<label for="english">English</label>
<input type="checkbox" name="lang" value="english"/>
<label for="hindi">Hindi</label>
<input type="checkbox" name="lang" value="hindi"/>
</div>
<button id="selectedValue">Selected Value</button>
<button id="selectedText">Selected text</button>
<button id="selectedIndex">Selected index</button>
</body>
</html>

Tuesday, 30 July 2013

JQuery Radio Button

//To uncheck by default checked radio button

$("input:radio[name='radioButtonName']").attr("checked",false);

//To check particular radio button with starting index 0 or 1 or 2

$("input:radio[name='radioButtonName']")[0].checked = true;

//To get the value of selected radio button

$("input:radio[name='radioButtonName']:checked").val();

//To get the text(display text in radio button label) of selected radio button

$("input:radio[name='radioButtonName']:checked").parent().text();

//To get the index of selected radio buttons

var temp = $("input:radio[name='radioButtonName']");

var selectedIndex = temp.index(temp.filter(":checked"));

EXAMPLE PROGRAM

<html>
<head>
<style>

.addSelColor {
color: red;
}

.MyCssClass {
background-color: green;
cursor: pointer;
border: 2px solid yellow;
}

</style>

<script src="jquery.js"></script>
<script>
$(document).ready(function() {

  alert("Jquery is Loaded");

$("input:radio[name=sex]").change(function() {
  alert($(this).val());
  $(".radioClass").parent().removeClass("addSelColor"); //for css
  $(".radioClass:checked").parent().addClass("addSelColor"); //for css
});

$("#ClearButton").click(function() {
  $("input:radio[name=sex]").attr("checked",false);
});

$("#selectMale").click(function() {
  $("input:radio[name=sex]")[0].checked = true;
  $(".radioClass").parent().removeClass('addSelColor'); //for css
  $(".radioClass:checked").parent().addClass('addSelColor'); //for css
});

$("#selectFemale").click(function() {
  $("input:radio[name=sex]")[1].checked = true;

  $(".radioClass").parent().removeClass("addSelColor"); //for css
  $(".radioClass:checked").parent().addClass("addSelColor"); //for css
});

$("#hideButton").click(function() {
  $("#radioDiv").hide();
});

$("#showButton").click(function() {
  $("#radioDiv").show();
});

$("#getVal").click(function() {
  var temp=$("input:radio[name=sex]:checked").val();
  alert(temp);
});

$("#getText").click(function() {
  var temp=$("input:radio[name=sex]:checked").parent().text();
  alert(temp);
});

$("#getIndex").click(function() {
  var temp = $("input:radio[name=sex]");
  var selectedIndex = temp.index(temp.filter(":checked"));
  alert(selectedIndex);
});

$("#acss").click(function() {
  $("label[for=male]").addClass("MyCssClass");
  $("label[for=female]").addClass("MyCssClass");
});

$("#rcss").click(function() {
  $("label[for=male]").removeClass("MyCssClass");
  $("label[for=female]").removeClass("MyCssClass");
});

});
</script>
</head>
<body>
<div id="radioDiv">

<label for="male">
<input type="radio" class="radioClass" name="sex" value="BOY" checked>MALE<input>
</label>
<label for="female">
<input type="radio" class="radioClass" name="sex" value="GIRL">FEMALE</input>
</label>

</div></br>

  <button id="ClearButton">Reset</button></br>
  <button id="selectMale">Male</button></br>
  <button id="selectFemale">FeMale</button> </br>
  <button id="hideButton">Hide Radio Buttons</button></br>
  <button id="showButton">Show Radio Buttons</button></br>
  <button id="getVal">Get Selected Value</button></br>
  <button id="getText">Get Selected Text</button></br>
  <button id="getIndex">Get Selected Index</button></br>
  <button id="acss">ApplyCss</button></br>
  <button id="rcss">RemoveCss</button></br>

</body>
</html>

Saturday, 13 July 2013

Different ways to work with jQuery...

->First we have to download/copy JQuery code(In this blog already link is available).

->Place that code in one text file and save with the extension .js(Ex->jquery.js)

->create one html file and give this jquery.js file path in script tag(<script src="jquery.js"></script>)

->write jquery code in the script tag

->We can use following ways to work with JQuery

$(document).ready(function(){

alert("WELCOME TO JQUERY");
//write JQuery code here

});

jQuery(document).ready(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

window.jQuery(document).ready(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

window.$(document).ready(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

$(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

jQuery(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

//We can use any name instead of $
var ram=$.noConflict();
ram(document).ready(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

var ram=$.noConflict();
ram(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

var ram=$.noConflict();
window.ram(document).ready(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

var ram=$.noConflict();
window.ram(function() {

alert("WELCOME TO JQUERY");
//write JQuery code here

});

EXAMPLE PROGRAM
<html> <head> <script src="jquery.js"> </script> <script> $(document).ready(function() { alert("AFTER LOAD THE PAGE THIS JQUERY CODE IS EXECUTING"); //WRITE ANY JQUERY CODE }); </script> </head> <body> HOW TO WORK WITH JQUERY </body> </html>