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Dependency Injection In Spring Framework

Spring » On Aug 4, 2011 | { 15 Comments }

Guys, its very important concept in spring read it carefully

Dependency injection:

In this IOC, consider when our class object need to get any primitive values or it need  to access any other class objects or it may need  any collection type to access then, some external person will provide the required things (primitive values or objects or collections) to our class object.

Actually In IOC, our class is not responsible to get all these collaborating (required things like primitive values, collections bla bla) values explicitly, I mean it doesn’t perform any lookup operations for the things to access.

Come to Spring framework, here one external person who will provide [Injects] all the required things to our spring bean class is the spring ioc container

Types of dependency injections

For injecting the required things to the current spring class (spring bean) , spring ioc container will do this in different ways…

  • Setter injection
  • Construction injection
  • Interface injection

But in spring we have only setter, constructor injections but not interface injection,  In spring 2.x we have interface injection

Setter Injection

In this type of injection, the spring container uses setter method in the dependent (our) class for injecting its dependencies (primitive values..Or any).

Spring container knows whether to perform setter or constructor injection by reading the information from an external file called spring configuration file

In case of setter injection, the class must contain a setter method to get dependencies other wise spring container doesn’t inject the dependencies to dependent object

In spring we call each class as spring bean, this bean is no way related with the java bean

Spring bean and java bean both are not same because a java bean needs definitely a public default constructor but in spring bean, some time we include default constructor or sometimes we do not.

First Consider Our spring bean having the dependency in the form of primitive values, I mean our class need some primitive values…

And let us see an example on setter injection with primitive values in the next session[ before that check how to install spring framework ]

 

What you are thinkig....

15 Responses to “Dependency Injection In Spring Framework”
  1. kumar says:

    Hi,
    I think this tutorial regarding about Spring 2.X.
    Before we learn spring 3,should we learn spring 2.X?
    Can we learn Spring 3 without referring Spring 2.X?

    What is better way to learn Spring ?
    Please Advice.Thank You

  2. Java4s says:

    @kumar

    You can learn spring 3.x directly with out knowing the knowledge of 2.x. there is no much difference.

    In 3.x you can learn little more :-) but all concepts are same, refer this blog while you are in the course.

    Enjoy spring, cheers ;)

  3. shyam says:

    present content of spring is just basics….it’s very good for freshers actually we need real time concepts like SPRING MVC 3.0 , Spring with hibernate,spring with ejb 3.0 and transaction management of spring , and mainly mixing of all modules of spring one project explanation….we hope you provide this content ASAP

  4. Java4s says:

    @Shyam

    I agree :-) we will provide these real time application ASAP, thank you.

  5. Vishal says:

    Hi Java4s,
    I am the new in spring.can you please tell me the exact role of the AOP in spring.

    Vishal Singh

  6. Vishal says:

    Thanks

  7. surendra says:

    one of best Web site that I haven’t seen till now with clear examples and explanation. Keep it up guys

  8. Nagendra says:

    What a site this is,even the person who doesn’t know anything about Sping,he also can learn easily by visiting this site..FLAWLESS,AWESOME..KEEP IT UP

  9. Muthu says:

    Thanks for this tutorial. Could you explain with some sample code. Then really it will helps me.

  10. Sri says:

    Hi Sivateja,
    Good to see your tutorials.
    it is very lucid.
    can you please come up with any one of the real time project explanation with any combination.
    Hope you understood the requirement.
    Thanks in advance

  11. It is very useful for basic spring learners.
    Thankful to providing …………….

  12. Azhark says:

    HI,

    i am following your tutorials since i am in to JAVA , really good Explanation , Thanks for sharing your knowledge .

  13. surya says:

    All things described here are to the point… Keep going !!!

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