Tuesday, November 28, 2017
Monday, November 27, 2017
Different Types of Bean Injection in Spring
1. Overview
In this tutorial, we’re going to take a first look at the Different Types of Bean Injection in Spring.Spring framework is eminent for its implementation of Inversion of Control (IoC) principle that is also called Dependency Injection (DI). It's the best feature is loosely coupled and reusable beans, an object managed by Spring. More specifically, it can be instantiated, configured and otherwise managed by a Spring Framework container. Beans are defined in a Spring configuration file (or by using annotations), instantiated by the Spring container, and then injected into our application.
2. Characteristics of Dependency Injection
i) DI is where a needed dependency is injected by another object.ii) The class being injected has no responsibility in instantiating the object being injected.
iii) Avoid declaring object using [new]
3. Types of Dependency Injections
There are 3 types of dependency injection.i) By Property
ii) By Setter
iii) By Constructor
By Constructor is favored most. It requires the dependency to be injected when the class is instantiated.
By Setter:
The <property> sub-element of <bean> is actually used for setter injection. Here,
i) property element invokes the setter method.
ii) value sub-element of a property will assign the specified value.
By Constructor:
Constructor based injection defines bean dependencies via constructor as one or more constructor arguments, which are injected by the container at the time of bean creation. It can be defined via XML based configuration as the following section:
<bean id="person" class="com.spring.tutorial.Person"> <constructor-arg value="6012" name="id" type="int"> </constructor-arg> <constructor-arg value="Zakir" name="name" type="String"></constructor-arg> <property value="224498" name="nationalId"> </property> <property name="address" ref="address"></property> </bean> <bean id="address" class="com.spring.tutorial.Address"> <constructor-arg name="street" value="1 Jessore Benapole Lane"></constructor-arg> <constructor-arg name="postcode" value="7432"></constructor-arg> </bean>Spring support Dependency Injection against a private property. For this, it requires injecting the dependency using reflection at run-time. However, this is considered a VERY bad practice.
Resource Link:
4. Why we choose constructor Injection?
Oliver Gierke has shown the real cause of choosing constructor Injection in this tutorial: Why field injection is evil?
5. Conclusion
All the code of this article is available over on Github. This is a Maven-based project, so it should be easy to import and run as it is.How to install Kdiff3 in Ubuntu?
Install kdiff3
$ sudo apt-get update
$ sudo apt-get install kdiff3
Then run
$ kdiff3
How to install git in Ubuntu?
Install Git
$ sudo apt-get update
$ sudo apt-get install git
Set Up Git
$ git config --global user.name "Your Name"
$ git config --global user.email "youremail@domain.com"
Install git-gui
$ sudo apt-get update
$ sudo apt-get install git-gui
How to Install Groovy in Ubuntu?
INSTALL JAVA
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer
$ sudo apt-get install oracle-java8-set-default
INSTALL GROOVY
1. open Terminal and write the text
$ sudo apt-get update
$ sudo apt-get install groovy
2.Then check groovy using
Saturday, November 25, 2017
Friday, November 24, 2017
JQuery Learning Step by Step
A silly code of JQuery
Info: This code show how a class rohan and id rita is used for hiding.
<!DOCTYPE html>
<html>
<head>
<script src="jquery-1.9.1.min.js">
</script>
<script>
$(document).ready(function(){
$("p#rita").click(function(){
$(this).hide();
});
$("p.rohan").click(function(){
$(this).hide();
});
});
</script>
</head>
<body>
<p id="rita">If you click on me, I will disappear.</p>
<p class="rohan">Click me away!</p>
<p class="rohan">Click me too!</p>
<div class="rohan">My father</div> //In this case it can not be disappeared bcoz it is
// div#rohan
</body>
</html>
1.First Step
$(document).ready();
2.Second Step
$(document).ready(function(){
});
এই second bracket er moddhe amra function body likhbo
3.Third Step
$(document).ready(function(){
$("p").click(function(){
$(this).hide();
});
});ekhane shokol p te click korle p gulo hide hoye jabe.
Issue1.0:
<p>My name is khan</p>
<button>Click Me</button>
$(“button”).click(function(){
$(“p”).hide();
});
ekhane button ta k click korle p er moddhe thaka(my name is khan) part ta hide hoye jabe.
Info:
$(":button")
Selects all <button> elements and <input> elements of type="button"
এখানে কোলন ব্যবহার করা হয়েছে।যা <button></button> এবং
<input type=”button” value=”Press Me!”>
দুই জায়গাতেই কাজ করতে পারে।
$(this).hide() - hides the current element.
$("p").hide() - hides all <p> elements.
$(".test").hide() - hides all elements with class="test".
$("#test").hide() - hides the element with id="test".
Various type of events are used in jquery are given below:
Mouse Events
|
Keyboard Events
|
Form Events
|
Document/Window Events
|
click
|
keypress
|
submit
|
load
|
dblclick
|
keydown
|
change
|
resize
|
mouseenter
|
keyup
|
focus
|
scroll
|
mouseleave
|
blur
|
unload
|
$("input").focus(function(){
$(this).css("background-color","red");
});
$("input").blur(function(){
$(this).css("background-color","#ffffff");
});
এখানে focus() method টা হল যদি কেউ input এর উপর click করে, তবে red রঙ দেখাবে।আর ওই field ছাড়া অন্য কোথাও click করলে white(#ffffff) show করবে।
hover()
The hover() method takes two functions and is a combination of the mouseenter() and mouseleave() methods.
$("#p1").hover(function(){
alert("You entered p1!");
},
function(){
alert("Bye! You now leave p1!");
});
####################################################
hide() and show() method using speed 1000ms
<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button#hide").click(function(){
$("p").hide(1000);
});
$("button#show").click(function(){
$("p").show(1000);
});
});
</script>
</head>
<body>
<button id="hide">Hide</button>
<button id="show">Show</button>
<p>This is a paragraph with little content.</p>
<p>This is another small paragraph.</p>
</body>
</html>
Output:
Hide Show
This is a paragraph with little content.
This is another small paragraph.
এখানে Hide button e click korle 1000ms somoy niye ei text ta hide hoye jabe..
আবার Show button এ ক্লিক করলে ১০০০মিলিসেকেন্ডের মধ্যে text টা show করবে।
এটা না করে আমরা toggle() method টা ব্যবহার করতে পারি।
$(selector).toggle(speed,callback);
The optional speed parameter can take the following values: "slow", "fast", or milliseconds.
The optional callback parameter is the name of a function to be executed after the toggle() method completes.
ekhane speed ta use hosse koto millisecond dhore kaj ta hobe sheta bujhanor jonno.
ar callback method ta call hosse, j toggle ta 1000 ms dhore hobar pore kon method call hobe ba ki kaj korbe.?
1.$("button").click(function(){
$("p").hide(1000);
});
jQuery has the following fade methods:
- fadeIn()
- fadeOut()
- fadeToggle()
- fadeTo()
********************************************************
<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").fadeIn();
$("#div2").fadeIn("slow");
$("#div3").fadeIn(3000);
});
});
</script>
</head>
<body>
<p>Demonstrate fadeIn() with different parameters.</p>
<button>Click to fade in boxes</button>
<br><br>
<div id="div1" style="width:80px;height:80px;display:none;background-color:red;"></div><br>
<div id="div2" style="width:80px;height:80px;display:none;background-color:green;"></div><br>
<div id="div3" style="width:80px;height:80px;display:none;background-color:blue;"></div>
</body>
</html>
********************************************************
1.$("button").click(function(){
$("#div1").fadeIn();
$("#div2").fadeIn("slow");
$("#div3").fadeIn(3000);
});
2.$("button").click(function(){
$("#div1").fadeOut();
$("#div2").fadeOut("slow");
$("#div3").fadeOut(3000);
});
3.$("button").click(function(){
$("#div1").fadeToggle();
$("#div2").fadeToggle("slow");
$("#div3").fadeToggle(3000);
});
jQuery fadeTo() Method
The jQuery fadeTo() method allows fading to a given opacity (value between 0 and 1).
Syntax:
$(selector).fadeTo(speed,opacity,callback);
The required speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds.
The required opacity parameter in the fadeTo() method specifies fading to a given opacity (value between 0 and 1).
The optional callback parameter is the name of a function to be executed after the function completes.
The following example demonstrates the fadeTo() method with different parameters:
$("button").click(function(){
$("#div1").fadeTo("slow",0.15);
$("#div2").fadeTo("slow",0.4);
$("#div3").fadeTo("slow",0.7);
});
By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!
***************************************************************
$("div").animate({
left:'250px',
opacity:'0.5',
height:'150px',
width:'150px'
});
এখানে animate() এর ভিতরে {} ব্যবহার করা হয়।
{} এর মাঝে
left:’250px’
এই ফরম্যাট এ লেখা হয়।
ending কোন (;) sign ব্যবহার করা হয় না।
**********************************************************
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