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Презентация на тему 2. Java Spring Core 3. Spring IoC Container

Содержание

2. The Spring ContainerThe container will: create the
3. Dependency InjectionThe Spring container uses dependency injection
4. DI Implementation*Victor Mozharsky
5. Container’s MetadataThe container gets its instructions on
6. How Spring Works*Victor Mozharsky
7. Spring Bean DefinitionThe objects that form the
8. XML Metadata *Victor Mozharsky
9. Spring Bean DefinitionEach bean definition can contain
10. Bean Definition AttributesClass attribute is mandatory and
11. Spring Tool Suite InstallationOpen Eclipse -> Help
12. Example 1. Hello World in SpringCreate Spring
13. Example 1. Create Spring ProjectFile -> New
14. Example 1. Create Spring ProjectRemove from com.bionic.edu
15. Example 1. Logging Dependencies*
16. Add Dependencies to the pom.xml FileOpen pom.xml
17. Further pom.xml TuningSelect log4j (1.2.14) dependency and
18. Maven clean&install actionsRight click on the project’s
19. Example 1. Hello World in SpringCreate Spring
20. Example 1. log4j2.xml in resources
21. Example 1. Hello World in SpringCreate Spring
22. E1. GreetingService Interfacepackage com.bionic.edu; public interface GreetingService { void sendGreeting();}*Victor Mozharsky
23. E1. HelloWorldService Classpackage com.bionic.edu; public class HelloWorldService implements
24. E1. HelloKittyService Classpackage com.bionic.edu; public class HelloKittyService implements
25. Example 1. Hello World in SpringCreate Spring
26. Bean DefinitionThe element tells Spring to create
27. Example 1. Bean Definition*Victor Mozharsky
28. Example 1. Configuration FileRight click on src/main/resources
29. Example 1. Configuration File *Victor Mozharsky
30. Example 1. Hello World in SpringCreate Spring
31. Application Context You can load the Spring
32. Example 1. Application Classpackage com.bionic.edu;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public
33. Example 1. Hello World in SpringCreate Spring
34. Example 1.Run application. You will get Hello, world!See P211BeanDefinition project for the full text*Victor Mozharsky
35. Injecting through ConstructorsA class can be constructed
36. Example 2. HelloWorldService package com.bionic.edu;public class HelloWorldService
37. Example 2. Bean Definition *Victor Mozharsky
38. Example 2.Run application. You will get Hello, world!
39. Injecting Object ReferencesYou should use ref attribute in a for passing references to other beans*Victor Mozharsky
40. Example 3. Application Classpublic class Application {
41. Example 3. Bean Definition *Victor Mozharsky
42. Example 3 OutputHello, world! I am Victor.*Victor Mozharsky
43. Example 3. Bean Definition *Victor Mozharsky
44. Example 3 OutputHello, Kitty!See P213ConstructorInjection project for the full text*Victor Mozharsky
45. Property TagsYou can use tag to pass
46. Example 4. Simple Value InjectionAdd accessor to
47. Example 4. OutputHello, world! I am Victor.See P214PropertySimple project for the full text*Victor Mozharsky
48. Simple Value Injection isn’t limited to injecting
49. Example 5. Numeric Injection public class HelloWorldService
50. Example 5. beans.xml *Victor Mozharsky
51. Example 5. OutputHello, world! I am Victor.Hello,
52. Object InjectionThe real value of DI is
53. Example 5. Reference InjectionAdd getter&setter for greeting
54. Example 5. OutputHello, Kitty!*Victor Mozharsky
55. Example 5. Bean.xml Changes *Victor Mozharsky
56. Example 5. OutputHello, world! I am Victor.See P216PropertyRef project for the full text*Victor Mozharsky
57. Auto WiringIn large applications, the number of
58. Auto-Wiring based on AnnotationsUse the tag in
59. The @Inject annotation The @Inject annotation can
60. AutodiscoveryBy default, looks for classes that are
61. @Component vs @Named@Named and @Component annotations are
62. Example 6. AnnotationsCreate Spring project with name P221FirstInjectTune pom.xml fileTune beans.xnm fileCreate application classesRun application*Victor Mozharsky
63. Example 6. pom.xml Add the following dependency to the project’s pom.xml file: javax.inject javax.inject 1*Victor Mozharsky
64. Example 6. beans.xmlCreate the following beans.xml file: *Victor Mozharsky
65. Example 6. HelloWorldServicepackage com.bionic.edu;import javax.inject.Named;@Namedpublic class HelloWorldService
66. Example 6. Application Class@Namedpublic class Application {
67. Example 6. OutputHello, world! See P221FirstInject project for the full text*Victor Mozharsky
68. Example 7. Autowiring by NameAnnotate HelloKittyService class
69. Example 7. OutputRunning the application leads to
70. The @Named Annotation If multiple bean types
71. Example 7. @Named Annotation@Namedpublic class Application {
72. Example 7. OutputHello, world! *Victor Mozharsky
73. Example 7. @Named Annotation@Namedpublic class Application {
74. Скачать презентацию
75. Похожие презентации

The Spring ContainerThe container will: create the objects wire them together configure them manage their complete lifecycle from creation till destruction. These objects are called Spring Beans *Victor Mozharsky

Dependency InjectionThe Spring container uses dependency injection (DI) to manage the componentsIn

Container’s MetadataThe container gets its instructions on what objects to instantiate, configure,

Spring Bean DefinitionThe objects that form the backbone of your application and

Spring Bean DefinitionEach bean definition can contain a set of the following

Bean Definition AttributesClass attribute is mandatory and specify the bean class to

Spring Tool Suite InstallationOpen Eclipse -> Help -> Eclipse Marketplace…Find = STS

Example 1. Hello World in SpringCreate Spring projectTune project for loggingCreate project

Example 1. Create Spring ProjectFile -> New -> Other.. -> Spring ->

Example 1. Create Spring ProjectRemove from com.bionic.edu package (src/main/java) template files Service.java

Add Dependencies to the pom.xml FileOpen pom.xml -> Dependencies tab -> select

Further pom.xml TuningSelect log4j (1.2.14) dependency and click Remove buttonGo to pom.xml

Maven clean&install actionsRight click on the project’s name -> Maven -> Update

E1. GreetingService Interfacepackage com.bionic.edu; public interface GreetingService { void sendGreeting();}*Victor Mozharsky

E1. HelloWorldService Classpackage com.bionic.edu; public class HelloWorldService implements GreetingService { public

E1. HelloKittyService Classpackage com.bionic.edu; public class HelloKittyService implements GreetingService { public

Bean DefinitionThe element tells Spring to create an object for you. The

Example 1. Bean Definition*Victor Mozharsky

Example 1. Configuration FileRight click on src/main/resources -> New -> FileFill File

Example 1. Configuration File *Victor Mozharsky

Application Context You can load the Spring application context using the following

Example 1. Application Classpackage com.bionic.edu;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Application {

Example 1.Run application. You will get Hello, world!See P211BeanDefinition project for the full text*Victor Mozharsky

Injecting through ConstructorsA class can be constructed in two different ways:Using the

Example 2. HelloWorldService package com.bionic.edu;public class HelloWorldService implements GreetingService {

Example 2. Bean Definition *Victor Mozharsky

Example 2.Run application. You will get Hello, world! I am Victor.See P212ConstructorInjection project

Injecting Object ReferencesYou should use ref attribute in a for passing references to other beans*Victor Mozharsky

Example 3. Application Classpublic class Application { GreetingService greeting =

Example 3. Bean Definition *Victor Mozharsky

Example 3 OutputHello, world! I am Victor.*Victor Mozharsky

Example 3 OutputHello, Kitty!See P213ConstructorInjection project for the full text*Victor Mozharsky

Property TagsYou can use tag to pass the values of different variables

Example 4. Simple Value InjectionAdd accessor to HelloWorldService classChange beans.xml as follows

Example 4. OutputHello, world! I am Victor.See P214PropertySimple project for the full text*Victor Mozharsky

Simple Value Injection isn’t limited to injecting String valuesThe value attribute can

Example 5. Numeric Injection public class HelloWorldService implements GreetingService {

Example 5. OutputHello, world! I am Victor.Hello, world! I am Victor.Hello, world!

Object InjectionThe real value of DI is found in wiring an application’s

Example 5. Reference InjectionAdd getter&setter for greeting field of Application classChange beans.xml

Example 5. OutputHello, Kitty!*Victor Mozharsky

Example 5. Bean.xml Changes *Victor Mozharsky

Example 5. OutputHello, world! I am Victor.See P216PropertyRef project for the full text*Victor Mozharsky

Auto WiringIn large applications, the number of beans will increase and the

Auto-Wiring based on AnnotationsUse the tag in spring-context.xml Use the @Inject annotation

The @Inject annotation The @Inject annotation can be used to qualify: a

AutodiscoveryBy default, looks for classes that are annotated as:@Component - indicates that

@Component vs @Named@Named and @Component annotations are used enabling a class to

Example 6. AnnotationsCreate Spring project with name P221FirstInjectTune pom.xml fileTune beans.xnm fileCreate application classesRun application*Victor Mozharsky

Example 6. pom.xml Add the following dependency to the project’s pom.xml file: javax.inject javax.inject 1*Victor Mozharsky

Example 6. beans.xmlCreate the following beans.xml file: *Victor Mozharsky

Example 6. HelloWorldServicepackage com.bionic.edu;import javax.inject.Named;@Namedpublic class HelloWorldService implements GreetingService { public

Example 6. Application Class@Namedpublic class Application { @Inject GreetingService greeting

Example 6. OutputHello, world! See P221FirstInject project for the full text*Victor Mozharsky

Example 7. Autowiring by NameAnnotate HelloKittyService class with @Named:package com.bionic.edu;import javax.inject.Named;@Namedpublic class

Example 7. OutputRunning the application leads to an exceptionException in thread

The @Named Annotation If multiple bean types are available for injection, then

Example 7. @Named Annotation@Namedpublic class Application { @Inject @Named(

Example 7. OutputHello, world! *Victor Mozharsky

Example 7. OutputHello, Kitty!See P222InjectByName project for the full text *Victor Mozharsky

Слайды презентации

Слайд 2 The Spring Container
The container will:
create the objects

The Spring ContainerThe container will: create the objects wire them together

wire them together
configure them
manage their complete lifecycle

from creation till destruction.
These objects are called Spring Beans

Victor Mozharsky

Слайд 3 Dependency Injection
The Spring container uses dependency injection (DI)

Dependency InjectionThe Spring container uses dependency injection (DI) to manage the

to manage the components
In a complex Java application classes

should be as independent as possible to increase the possibility to reuse these classes and to test them independently
Dependency Injection helps in connecting these classes together and same time keeping them independent.

Victor Mozharsky

Слайд 4 DI Implementation
*
Victor Mozharsky

Слайд 5 Container’s Metadata
The container gets its instructions on what

Container’s MetadataThe container gets its instructions on what objects to instantiate,

objects to instantiate, configure, and assemble by reading configuration

metadata provided:
by XML
Java annotations
Java code

Victor Mozharsky

Слайд 6 How Spring Works

*
Victor Mozharsky

Слайд 7 Spring Bean Definition
The objects that form the backbone

Spring Bean DefinitionThe objects that form the backbone of your application

of your application and that are managed by the

Spring IoC container are called beans
The bean definition contains the information called configuration metadata which is needed for the container to know:
How to create a bean
Bean's lifecycle details
Bean's dependencies

Victor Mozharsky

Слайд 8 XML Metadata

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

Victor Mozharsky

Слайд 9 Spring Bean Definition
Each bean definition can contain a

Spring Bean DefinitionEach bean definition can contain a set of the

set of the following properties:
Class
Name
Scope
constructor-arg
Properties
autowiring mode
lazy-initialization mode
initialization method
destruction method

Victor Mozharsky

Слайд 10 Bean Definition Attributes
Class attribute is mandatory and specify

Bean Definition AttributesClass attribute is mandatory and specify the bean class

the bean class to be used to create the

bean
Name attribute specifies the bean identifier uniquely. In XML-based configuration metadata, you use the id and/or name attributes to specify the bean identifier(s)
Properties is used to inject the dependencies

Victor Mozharsky

Слайд 11 Spring Tool Suite Installation
Open Eclipse -> Help ->

Spring Tool Suite InstallationOpen Eclipse -> Help -> Eclipse Marketplace…Find =

Eclipse Marketplace…
Find = STS -> click Find button ->

select STS for Eclipse Luna -> Install button -> Confirm -> I accept -> Finish
Restart Eclipse

Victor Mozharsky

Слайд 12 Example 1. Hello World in Spring
Create Spring project
Tune

Example 1. Hello World in SpringCreate Spring projectTune project for loggingCreate

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

context
Run application

Victor Mozharsky

Слайд 13 Example 1. Create Spring Project
File -> New ->

Other.. -> Spring -> Spring project -> Next
Project name

= P211BeanDefinition, Templates = Simple Spring Utility Project -> Next
Package = com.bionic.edu -> Finish

Victor Mozharsky

Слайд 14 Example 1. Create Spring Project
Remove from com.bionic.edu package

Example 1. Create Spring ProjectRemove from com.bionic.edu package (src/main/java) template files

(src/main/java) template files Service.java and ExampleService.java
Remove from com.bionic.edu package

(src/test/java) template files ExampleConfigurationTests.java and ExampleServiceTests.java

Victor Mozharsky

Слайд 15 Example 1. Logging Dependencies
*

Слайд 16 Add Dependencies to the pom.xml File
Open pom.xml ->

Add Dependencies to the pom.xml FileOpen pom.xml -> Dependencies tab ->

Dependencies tab -> select junit: 3.8.1[test] -> Properties ->

change version to 4.7 -> Ok
Press Add button -> GroupId = org.slf4j, ArifactId = slf4j-api, Vesion = 1.7.5 -> Ok
Press Add button -> GroupId = org.apache. logging.log4j, ArtifactId = log4j-api, Version = 2.0.2 -> Ok
And so on… Then -> Save

Слайд 17 Further pom.xml Tuning
Select log4j (1.2.14) dependency and click

Further pom.xml TuningSelect log4j (1.2.14) dependency and click Remove buttonGo to

Remove button
Go to pom.xml tag and change 1.5 Java

version to 1.8 both in and tags of maven-compiler-plugin artefact
Change Spring version to 4.1.1.RELEASE in tag
Save pom.xml file

Victor Mozharsky

Слайд 18 Maven clean&install actions
Right click on the project’s name

Maven clean&install actionsRight click on the project’s name -> Maven ->

-> Maven -> Update project -> Ok
Right click on

the project’s name -> Run As… -> Maven clean
Right click on the project’s name -> Run As… -> Maven install

Слайд 19 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

context
Run application

Victor Mozharsky

Слайд 20 Example 1. log4j2.xml in resources

Victor Mozharsky

Слайд 21 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

context
Run application

Victor Mozharsky

Слайд 22 E1. GreetingService Interface
package com.bionic.edu;

public interface GreetingService {
void sendGreeting();
}

*
Victor

Mozharsky

Слайд 23 E1. HelloWorldService Class
package com.bionic.edu;

public class HelloWorldService implements
GreetingService

{
public void sendGreeting() {
System.out.println("Hello, world!");

}
}

Victor Mozharsky

Слайд 24 E1. HelloKittyService Class
package com.bionic.edu;

public class HelloKittyService implements GreetingService

{
public void sendGreeting(){
System.out.println("Hello, Kitty!");

}
}

Victor Mozharsky

Слайд 25 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

context
Run application

Victor Mozharsky

Слайд 26 Bean Definition
The element tells Spring to create

Bean DefinitionThe element tells Spring to create an object for you.

an object for you.
The id attribute gives the

bean a name by which it’ll be referred to in the Spring container.
When the Spring container loads its beans, it’ll instantiate the bean using the default constructor.

Victor Mozharsky

Слайд 27 Example 1. Bean Definition

*
Victor Mozharsky

Слайд 28 Example 1. Configuration File
Right click on src/main/resources ->

Example 1. Configuration FileRight click on src/main/resources -> New -> FileFill

New -> File
Fill File name with configuration file Id

(beans.xml) -> Finish
Create configuration file context (see next slide) -> Save

Victor Mozharsky

Слайд 29 Example 1. Configuration File

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

Victor Mozharsky

Слайд 30 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

context
Run application

Victor Mozharsky

Слайд 31 Application Context
You can load the Spring application

Application Context You can load the Spring application context using the

context using the following code:

ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

GreetingService service = (GreetingService)ctx.getBean("helloWorldService");
service.sendGreeting();

Victor Mozharsky

Слайд 32 Example 1. Application Class
package com.bionic.edu;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class

Application {

public static void main(String[] args)

{
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
GreetingService service =
(GreetingService)ctx.getBean("helloWorldService");
service.sendGreeting();
}
}

Victor Mozharsky

Слайд 33 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

context
Run application

Victor Mozharsky

Слайд 34 Example 1.
Run application. You will get
Hello, world!

See P211BeanDefinition

project for the full text
*
Victor Mozharsky

Слайд 35 Injecting through Constructors
A class can be constructed in

Injecting through ConstructorsA class can be constructed in two different ways:Using

two different ways:
Using the default constructor
Using a constructor that

takes an argument(s)
If no are given in a bean definition, the default constructor is used.
A with a value attribute leads to the other constructor will be used instead.

Victor Mozharsky

Слайд 36 Example 2. HelloWorldService
package com.bionic.edu;
public class HelloWorldService implements

GreetingService {
public String message;

public HelloWorldService(){ message = ""; }
public HelloWorldService(String message){
this.message = message;
}
public void sendGreeting() {
System.out.println("Hello, world! " + message);
}
}

Victor Mozharsky

Слайд 37 Example 2. Bean Definition

class="com.bionic.edu.HelloWorldService">

*
Victor Mozharsky

Слайд 38 Example 2.
Run application. You will get
Hello, world! I

Example 2.Run application. You will get Hello, world! I am Victor.See P212ConstructorInjection

am Victor.

See P212ConstructorInjection project for the full text
*
Victor Mozharsky

Слайд 39 Injecting Object References
You should use ref attribute in

a for passing references to other beans

*
Victor Mozharsky

Слайд 40 Example 3. Application Class
public class Application {

GreetingService greeting = null;
public Application(){}

public Application(GreetingService greeting){ this.greeting = greeting; }

public static void main(String[] args) {
ApplicationContext ctx = new
ClassPathXmlApplicationContext("beans.xml");
Application application = (Application)ctx.getBean("application");
application.start();
}
public void start(){
if (greeting != null) greeting.sendGreeting();
} }

Victor Mozharsky

Слайд 41 Example 3. Bean Definition

Victor Mozharsky

Слайд 42 Example 3 Output
Hello, world! I am Victor.
*
Victor Mozharsky

Слайд 43 Example 3. Bean Definition

class="com.bionic.edu.HelloKittyService" />

Victor Mozharsky

Слайд 44 Example 3 Output
Hello, Kitty!

See P213ConstructorInjection project for the

full text
*
Victor Mozharsky

Слайд 45 Property Tags
You can use tag to pass

Property TagsYou can use tag to pass the values of different

the values of different variables used at the time

of object creation
is similar to in many ways, except that instead of injecting values through a constructor argument, injects by calling a property’s setter method.

Victor Mozharsky

Слайд 46 Example 4. Simple Value Injection
Add accessor to HelloWorldService

Example 4. Simple Value InjectionAdd accessor to HelloWorldService classChange beans.xml as

class
Change beans.xml as follows

value="I am Victor." />

Victor Mozharsky

Слайд 47 Example 4. Output
Hello, world! I am Victor.

See P214PropertySimple

project for the full text

*
Victor Mozharsky

Слайд 48 Simple Value Injection
isn’t limited to injecting String

Simple Value Injection isn’t limited to injecting String valuesThe value attribute

values
The value attribute can also specify numeric (int, float,

java.lang.Double, and so on) values as well as boolean values

Victor Mozharsky

Слайд 49 Example 5. Numeric Injection
public class HelloWorldService implements

GreetingService {
public String message;

public int repeat;

// constructors, getters&setters

public void sendGreeting() {
for (int i = 0; i < repeat; i++){
System.out.println("Hello, world! " + message);
}
}}

Victor Mozharsky

Слайд 50 Example 5. beans.xml

name="message" value="I am Victor." />

value="3" />

Victor Mozharsky

Слайд 51 Example 5. Output
Hello, world! I am Victor.
Hello, world!

Example 5. OutputHello, world! I am Victor.Hello, world! I am Victor.Hello,

I am Victor.
Hello, world! I am Victor.

See P215NumericInjection project

for the full text

Victor Mozharsky

Слайд 52 Object Injection
The real value of DI is found

Object InjectionThe real value of DI is found in wiring an

in wiring an application’s collaborating objects together so that

they don’t have to wire themselves together
Use ref attribute of tag for this purpose

Victor Mozharsky

Слайд 53 Example 5. Reference Injection
Add getter&setter for greeting field

Example 5. Reference InjectionAdd getter&setter for greeting field of Application classChange

of Application class
Change beans.xml as follows

Victor Mozharsky

Слайд 54 Example 5. Output
Hello, Kitty!
*
Victor Mozharsky

Слайд 55 Example 5. Bean.xml Changes

name="application" class="com.bionic.edu.Application">

Victor Mozharsky

Слайд 56 Example 5. Output
Hello, world! I am Victor.

See P216PropertyRef

project for the full text

*
Victor Mozharsky

Слайд 57 Auto Wiring
In large applications, the number of beans

Auto WiringIn large applications, the number of beans will increase and

will increase and the corresponding XML written to configure

the numerous beans will become very large
Spring provides a feature called 'Auto-Wiring' that minimizes the XML to be written provided that certain assumptions are made about the nomenclature of beans and properties
Spring provides auto-wiring based on both XML and Annotations

Victor Mozharsky

Слайд 58 Auto-Wiring based on Annotations
Use the tag in

Auto-Wiring based on AnnotationsUse the tag in spring-context.xml Use the @Inject

spring-context.xml
Use the @Inject annotation to qualify either the

member or a corresponding method (usually the setter method) which takes the injected type as argument

Victor Mozharsky

Слайд 59 The @Inject annotation
The @Inject annotation can be

The @Inject annotation The @Inject annotation can be used to qualify:

used to qualify:
a member
any method (including setter

method) which takes the injected type as argument

Victor Mozharsky

Слайд 60 Autodiscovery
By default, looks for classes that are annotated

AutodiscoveryBy default, looks for classes that are annotated as:@Component - indicates

as:
@Component - indicates that the class is a Spring

component
@Controller - indicates that the class defines a Spring MVC controller
@Repository - the class defines a data repository
@Service - the class defines a service
Any custom annotation that is itself annotated with @Component

Victor Mozharsky

Слайд 61 @Component vs @Named
@Named and @Component annotations are used

@Component vs @Named@Named and @Component annotations are used enabling a class

enabling a class to be auto detected as the

bean definition for spring’s application context
@Named is part of the Java specification JSR-330. It is more recommended since this annotation is not tied to Spring APIs.
@Component is part of the Spring’s annotations library.

Victor Mozharsky

Слайд 62 Example 6. Annotations
Create Spring project with name P221FirstInject
Tune

pom.xml file
Tune beans.xnm file
Create application classes
Run application
*
Victor Mozharsky

Слайд 63 Example 6. pom.xml
Add the following dependency to

the project’s pom.xml file:

javax.inject
javax.inject
1

*
Victor Mozharsky

Слайд 64 Example 6. beans.xml
Create the following beans.xml file:

encoding="UTF-8"?>

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">

Victor Mozharsky

Слайд 65 Example 6. HelloWorldService
package com.bionic.edu;
import javax.inject.Named;
@Named
public class HelloWorldService implements

GreetingService {
public String message;
public int

repeat;
. . . . . . . . . . . . . . . .
public void sendGreeting() {
for (int i = 0; i < repeat; i++){
System.out.println("Hello, world! " + message);
}
}
}

Victor Mozharsky

Слайд 66 Example 6. Application Class
@Named
public class Application {

@Inject
GreetingService greeting = null;
. .

. . . . . . . . . . . . . .
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
Application application = (Application)ctx.getBean("application");
application.start();
}
public void start(){
if (greeting != null) greeting.sendGreeting();
}}

Victor Mozharsky

Слайд 67 Example 6. Output
Hello, world!

See P221FirstInject project for

the full text
*
Victor Mozharsky

Слайд 68 Example 7. Autowiring by Name
Annotate HelloKittyService class with

Example 7. Autowiring by NameAnnotate HelloKittyService class with @Named:package com.bionic.edu;import javax.inject.Named;@Namedpublic

@Named:
package com.bionic.edu;
import javax.inject.Named;
@Named
public class HelloKittyService implements GreetingService {

public void sendGreeting(){
System.out.println("Hello, Kitty!");
}
}

Victor Mozharsky

Слайд 69 Example 7. Output
Running the application leads to an

exception
Exception in thread "main" org.springframework.beans.factory.BeanCreationException:
Error creating bean with

name 'application': Injection of autowired dependencies failed;
. . . . . . . . .
No unique bean of type [com.bionic.edu.GreetingService] is defined:
expected single matching bean but found 2: [helloKittyService, helloWorldService]

Victor Mozharsky

Слайд 70 The @Named Annotation
If multiple bean types are

The @Named Annotation If multiple bean types are available for injection,

available for injection, then Spring will be unable to

make a decision on which bean to inject and will throw an Exception
In such cases, we can use the @Named(name="..") annotation and give the name of the bean that we want Spring to inject.

Victor Mozharsky

Слайд 71 Example 7. @Named Annotation
@Named
public class Application {

@Inject
@Named("helloWorldService")
GreetingService greeting = null;

. . . . . . . . . . . . . . . .
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
Application application = (Application)ctx.getBean("application");
application.start();
}
. . . . . . . . . . . . . . . .

Victor Mozharsky

Слайд 72 Example 7. Output
Hello, world!

*
Victor Mozharsky

Слайд 73 Example 7. @Named Annotation
@Named
public class Application {

@Inject
@Named("helloKittyService")
GreetingService greeting = null;

Victor Mozharsky

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Обратная связь

Презентация на тему 2. Java Spring Core 3. Spring IoC Container

Содержание

Слайд 2 The Spring ContainerThe container will: create the objects

wire them together configure them manage their complete lifecycle

Слайд 3 Dependency InjectionThe Spring container uses dependency injection (DI)

to manage the componentsIn a complex Java application classes

Слайд 4 DI Implementation*Victor Mozharsky

Слайд 5 Container’s MetadataThe container gets its instructions on what

objects to instantiate, configure, and assemble by reading configuration

Слайд 6 How Spring Works*Victor Mozharsky

Слайд 7 Spring Bean DefinitionThe objects that form the backbone

of your application and that are managed by the

Слайд 8 XML Metadata

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

Слайд 9 Spring Bean DefinitionEach bean definition can contain a

set of the following properties:ClassNameScopeconstructor-argPropertiesautowiring modelazy-initialization modeinitialization methoddestruction method

Слайд 10 Bean Definition AttributesClass attribute is mandatory and specify

the bean class to be used to create the

Слайд 11 Spring Tool Suite InstallationOpen Eclipse -> Help ->

Eclipse Marketplace…Find = STS -> click Find button ->

Слайд 12 Example 1. Hello World in SpringCreate Spring projectTune

project for loggingCreate project classes (POJOs)Create Spring metadataCreate application

Слайд 13 Example 1. Create Spring ProjectFile -> New ->

Other.. -> Spring -> Spring project -> NextProject name

Слайд 14 Example 1. Create Spring ProjectRemove from com.bionic.edu package

(src/main/java) template files Service.java and ExampleService.javaRemove from com.bionic.edu package

Слайд 15 Example 1. Logging Dependencies*

Слайд 16 Add Dependencies to the pom.xml FileOpen pom.xml ->

Dependencies tab -> select junit: 3.8.1[test] -> Properties ->

Слайд 17 Further pom.xml TuningSelect log4j (1.2.14) dependency and click

Remove buttonGo to pom.xml tag and change 1.5 Java

Слайд 18 Maven clean&install actionsRight click on the project’s name

-> Maven -> Update project -> OkRight click on

Слайд 19 Example 1. Hello World in SpringCreate Spring projectTune

project for loggingCreate project classes (POJOs)Create Spring metadataCreate application

Слайд 20 Example 1. log4j2.xml in resources

Слайд 21 Example 1. Hello World in SpringCreate Spring projectTune

project for loggingCreate project classes (POJOs)Create Spring metadataCreate application

Слайд 22 E1. GreetingService Interfacepackage com.bionic.edu; public interface GreetingService { void sendGreeting();}*Victor

Mozharsky

Слайд 23 E1. HelloWorldService Classpackage com.bionic.edu; public class HelloWorldService implements GreetingService

{ public void sendGreeting() { System.out.println("Hello, world!");

Слайд 24 E1. HelloKittyService Classpackage com.bionic.edu; public class HelloKittyService implements GreetingService

{ public void sendGreeting(){ System.out.println("Hello, Kitty!");

Слайд 25 Example 1. Hello World in SpringCreate Spring projectTune

project for loggingCreate project classes (POJOs)Create Spring metadataCreate application

Слайд 26 Bean DefinitionThe element tells Spring to create

an object for you. The id attribute gives the

Слайд 27 Example 1. Bean Definition*Victor Mozharsky

Слайд 28 Example 1. Configuration FileRight click on src/main/resources ->

New -> FileFill File name with configuration file Id

Слайд 29 Example 1. Configuration File

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans

Слайд 30 Example 1. Hello World in SpringCreate Spring projectTune

project for loggingCreate project classes (POJOs)Create Spring metadataCreate application

Слайд 31 Application Context You can load the Spring application

context using the following code:ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

Слайд 32 Example 1. Application Classpackage com.bionic.edu;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class

Application { public static void main(String[] args)

Слайд 33 Example 1. Hello World in SpringCreate Spring projectTune

project for loggingCreate project classes (POJOs)Create Spring metadataCreate application

Слайд 34 Example 1.Run application. You will get Hello, world!See P211BeanDefinition

project for the full text*Victor Mozharsky

Слайд 35 Injecting through ConstructorsA class can be constructed in

two different ways:Using the default constructorUsing a constructor that

Слайд 36 Example 2. HelloWorldService package com.bionic.edu;public class HelloWorldService implements

GreetingService { public String message;

Слайд 37 Example 2. Bean Definition

class="com.bionic.edu.HelloWorldService"> *Victor Mozharsky

Слайд 38 Example 2.Run application. You will get Hello, world! I

am Victor.See P212ConstructorInjection project for the full text*Victor Mozharsky

Слайд 39 Injecting Object ReferencesYou should use ref attribute in

a for passing references to other beans*Victor Mozharsky

Слайд 40 Example 3. Application Classpublic class Application {

GreetingService greeting = null; public Application(){}

Слайд 41 Example 3. Bean Definition

Слайд 42 Example 3 OutputHello, world! I am Victor.*Victor Mozharsky

Слайд 43 Example 3. Bean Definition

Слайд 2 The Spring Container
The container will:
create the objects

wire them together
configure them
manage their complete lifecycle

Слайд 3 Dependency Injection
The Spring container uses dependency injection (DI)

to manage the components
In a complex Java application classes

Слайд 4 DI Implementation
*
Victor Mozharsky

Слайд 5 Container’s Metadata
The container gets its instructions on what

Слайд 6 How Spring Works

*
Victor Mozharsky

Слайд 7 Spring Bean Definition
The objects that form the backbone

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

Слайд 9 Spring Bean Definition
Each bean definition can contain a

set of the following properties:
Class
Name
Scope
constructor-arg
Properties
autowiring mode
lazy-initialization mode
initialization method
destruction method

Слайд 10 Bean Definition Attributes
Class attribute is mandatory and specify

Слайд 11 Spring Tool Suite Installation
Open Eclipse -> Help ->

Eclipse Marketplace…
Find = STS -> click Find button ->

Слайд 12 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

Слайд 13 Example 1. Create Spring Project
File -> New ->

Other.. -> Spring -> Spring project -> Next
Project name

Слайд 14 Example 1. Create Spring Project
Remove from com.bionic.edu package

(src/main/java) template files Service.java and ExampleService.java
Remove from com.bionic.edu package

Слайд 15 Example 1. Logging Dependencies
*

Слайд 16 Add Dependencies to the pom.xml File
Open pom.xml ->

Слайд 17 Further pom.xml Tuning
Select log4j (1.2.14) dependency and click

Remove button
Go to pom.xml tag and change 1.5 Java

Слайд 18 Maven clean&install actions
Right click on the project’s name

-> Maven -> Update project -> Ok
Right click on

Слайд 19 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

Слайд 21 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

Слайд 22 E1. GreetingService Interface
package com.bionic.edu;

public interface GreetingService {
void sendGreeting();
}

*
Victor

Слайд 23 E1. HelloWorldService Class
package com.bionic.edu;

public class HelloWorldService implements
GreetingService

{
public void sendGreeting() {
System.out.println("Hello, world!");

Слайд 24 E1. HelloKittyService Class
package com.bionic.edu;

public class HelloKittyService implements GreetingService

{
public void sendGreeting(){
System.out.println("Hello, Kitty!");

Слайд 25 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

Слайд 26 Bean Definition
The element tells Spring to create

an object for you.
The id attribute gives the

Слайд 27 Example 1. Bean Definition

*
Victor Mozharsky

Слайд 28 Example 1. Configuration File
Right click on src/main/resources ->

New -> File
Fill File name with configuration file Id

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans

Слайд 30 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

Слайд 31 Application Context
You can load the Spring application

context using the following code:

ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

Слайд 32 Example 1. Application Class
package com.bionic.edu;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class

Application {

public static void main(String[] args)

Слайд 33 Example 1. Hello World in Spring
Create Spring project
Tune

project for logging
Create project classes (POJOs)
Create Spring metadata
Create application

Слайд 34 Example 1.
Run application. You will get
Hello, world!

See P211BeanDefinition

project for the full text
*
Victor Mozharsky

Слайд 35 Injecting through Constructors
A class can be constructed in

two different ways:
Using the default constructor
Using a constructor that

Слайд 36 Example 2. HelloWorldService
package com.bionic.edu;
public class HelloWorldService implements

GreetingService {
public String message;

class="com.bionic.edu.HelloWorldService">

*
Victor Mozharsky

Слайд 38 Example 2.
Run application. You will get
Hello, world! I

am Victor.

See P212ConstructorInjection project for the full text
*
Victor Mozharsky

Слайд 39 Injecting Object References
You should use ref attribute in

a for passing references to other beans

*
Victor Mozharsky

Слайд 40 Example 3. Application Class
public class Application {

GreetingService greeting = null;
public Application(){}

Слайд 42 Example 3 Output
Hello, world! I am Victor.
*
Victor Mozharsky

Слайд 44 Example 3 Output
Hello, Kitty!

See P213ConstructorInjection project for the

full text
*
Victor Mozharsky

Слайд 45 Property Tags
You can use tag to pass

Слайд 46 Example 4. Simple Value Injection
Add accessor to HelloWorldService

class
Change beans.xml as follows

Слайд 47 Example 4. Output
Hello, world! I am Victor.

See P214PropertySimple

project for the full text

*
Victor Mozharsky

Слайд 48 Simple Value Injection
isn’t limited to injecting String

values
The value attribute can also specify numeric (int, float,

Слайд 49 Example 5. Numeric Injection
public class HelloWorldService implements

GreetingService {
public String message;

Слайд 51 Example 5. Output
Hello, world! I am Victor.
Hello, world!

I am Victor.
Hello, world! I am Victor.

See P215NumericInjection project

Слайд 52 Object Injection
The real value of DI is found

Слайд 53 Example 5. Reference Injection
Add getter&setter for greeting field