Презентация 2. Java Spring Core 3. Spring IoC Container онлайн
На нашем сайте вы можете скачать и просмотреть онлайн доклад-презентацию на тему 2. Java Spring Core 3. Spring IoC Container абсолютно бесплатно. Урок-презентация на эту тему содержит всего 74 слайда. Все материалы созданы в программе PowerPoint и имеют формат ppt или же pptx. Материалы и темы для презентаций взяты из открытых источников и загружены их авторами, за качество и достоверность информации в них администрация сайта не отвечает, все права принадлежат их создателям. Если вы нашли то, что искали, отблагодарите авторов - поделитесь ссылкой в социальных сетях, а наш сайт добавьте в закладки.
Оцените презентацию от 1 до 5 баллов!
- Тип файла:ppt / pptx (powerpoint)
- Всего слайдов:74 слайда
- Для класса:1,2,3,4,5,6,7,8,9,10,11
- Размер файла:0.96 MB
- Просмотров:75
- Скачиваний:0
- Автор:неизвестен
Слайды и текст к этой презентации:
№1 слайд
Содержание слайда: 2. Spring Core
3. Spring IoC Container
№2 слайд
Содержание слайда: The Spring Container
The container will:
create the objects
wire them together
configure them
manage their complete lifecycle from creation till destruction.
These objects are called Spring Beans
№3 слайд
Содержание слайда: Dependency Injection
The Spring container uses dependency injection (DI) 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.
№4 слайд
Содержание слайда: DI Implementation
№5 слайд
Содержание слайда: Container’s Metadata
The container gets its instructions on what objects to instantiate, configure, and assemble by reading configuration metadata provided:
by XML
Java annotations
Java code
№6 слайд
Содержание слайда: How Spring Works
№7 слайд
Содержание слайда: Spring Bean Definition
The objects that form the backbone 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
№8 слайд
Содержание слайда: XML Metadata
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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">
<!-- Bean declarations go here -->
</beans>
№9 слайд
Содержание слайда: 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
№10 слайд
Содержание слайда: Bean Definition Attributes
Class attribute is mandatory and specify 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
№11 слайд
Содержание слайда: Spring Tool Suite Installation
Open Eclipse -> Help -> Eclipse Marketplace…
Find = STS -> click Find button -> select STS for Eclipse Luna -> Install button -> Confirm -> I accept -> Finish
Restart Eclipse
№12 слайд
Содержание слайда: 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
№13 слайд
Содержание слайда: 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
№14 слайд
Содержание слайда: 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 (src/test/java) template files ExampleConfigurationTests.java and ExampleServiceTests.java
№15 слайд
Содержание слайда: Example 1. Logging Dependencies
№16 слайд
Содержание слайда: Add Dependencies to the pom.xml File
Open pom.xml -> 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
№17 слайд
Содержание слайда: Further pom.xml Tuning
Select log4j (1.2.14) dependency and click Remove button
Go to pom.xml tag and change 1.5 Java version to 1.8 both in <source> and <target> tags of maven-compiler-plugin artefact
Change Spring version to 4.1.1.RELEASE in <spring.framework.version> tag
Save pom.xml file
№18 слайд
Содержание слайда: Maven clean&install actions
Right click on the project’s name -> 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
№19 слайд
Содержание слайда: 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
№20 слайд
Содержание слайда: Example 1. log4j2.xml in resources
<?xml version="1.0" encoding="UTF-8"?>
<configuration status="WARN">
<appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
%logger{36} - %msg%n"/>
</Console>
</appenders>
<loggers>
<root level="warn">
<appender-ref ref="Console"/>
</root>
</loggers>
</configuration>
№21 слайд
Содержание слайда: 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
№22 слайд
Содержание слайда: E1. GreetingService Interface
package com.bionic.edu;
public interface GreetingService {
void sendGreeting();
}
№23 слайд
Содержание слайда: E1. HelloWorldService Class
package com.bionic.edu;
public class HelloWorldService implements
GreetingService {
public void sendGreeting() {
System.out.println("Hello, world!");
}
}
№24 слайд
Содержание слайда: E1. HelloKittyService Class
package com.bionic.edu;
public class HelloKittyService implements GreetingService {
public void sendGreeting(){
System.out.println("Hello, Kitty!");
}
}
№25 слайд
Содержание слайда: 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
№26 слайд
Содержание слайда: Bean Definition
The <bean> element tells Spring to create 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.
№27 слайд
Содержание слайда: Example 1. Bean Definition
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService" />
№28 слайд
Содержание слайда: Example 1. Configuration File
Right click on src/main/resources -> New -> File
Fill File name with configuration file Id (beans.xml) -> Finish
Create configuration file context (see next slide) -> Save
№29 слайд
Содержание слайда: Example 1. Configuration File
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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">
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService" />
</beans>
№30 слайд
Содержание слайда: 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
№31 слайд
Содержание слайда: Application Context
You can load the Spring application context using the following code:
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
GreetingService service = (GreetingService)ctx.getBean("helloWorldService");
service.sendGreeting();
№32 слайд
Содержание слайда: 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();
}
}
№33 слайд
Содержание слайда: 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
№34 слайд
Содержание слайда: Example 1.
Run application. You will get
Hello, world!
See P211BeanDefinition project for the full text
№35 слайд
Содержание слайда: Injecting through Constructors
A class can be constructed in two different ways:
Using the default constructor
Using a constructor that takes an argument(s)
If no <constructor-arg> are given in a bean definition, the default constructor is used.
A <constructor-arg> with a value attribute leads to the other constructor will be used instead.
№36 слайд
Содержание слайда: 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);
}
}
№37 слайд
Содержание слайда: Example 2. Bean Definition
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService">
<constructor-arg value="I am Victor." />
</bean>
№38 слайд
Содержание слайда: Example 2.
Run application. You will get
Hello, world! I am Victor.
See P212ConstructorInjection project for the full text
№39 слайд
Содержание слайда: Injecting Object References
You should use ref attribute in a <constructor-arg> for passing references to other beans
№40 слайд
Содержание слайда: 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();
} }
№41 слайд
Содержание слайда: Example 3. Bean Definition
<bean id="helloWorldService"
class="com.bionic.edu.HelloWorldService">
<constructor-arg value="I am Victor." />
</bean>
<bean name="application" class="com.bionic.edu.Application">
<constructor-arg ref="helloWorldService" />
</bean>
№42 слайд
Содержание слайда: Example 3 Output
Hello, world! I am Victor.
№43 слайд
Содержание слайда: Example 3. Bean Definition
<bean id="helloWorldService"
class="com.bionic.edu.HelloWorldService">
<constructor-arg value="I am Victor." />
</bean>
<bean id="helloKittyService"
class="com.bionic.edu.HelloKittyService" />
<bean name="application" class="com.bionic.edu.Application">
<constructor-arg ref="helloKittyService" />
</bean>
№44 слайд
Содержание слайда: Example 3 Output
Hello, Kitty!
See P213ConstructorInjection project for the full text
№45 слайд
Содержание слайда: Property Tags
You can use <property> tag to pass the values of different variables used at the time of object creation
<property> is similar to <constructor-arg> in many ways, except that instead of injecting values through a constructor argument, <property>injects by calling a property’s setter method.
№46 слайд
Содержание слайда: Example 4. Simple Value Injection
Add accessor to HelloWorldService class
Change beans.xml as follows
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService">
<property name="message" value="I am Victor." />
</bean>
<bean id="helloKittyService" class="com.bionic.edu.HelloKittyService" />
<bean name="application" class="com.bionic.edu.Application">
<constructor-arg ref="helloWorldService" />
</bean>
№47 слайд
Содержание слайда: Example 4. Output
Hello, world! I am Victor.
See P214PropertySimple project for the full text
№48 слайд
Содержание слайда: Simple Value Injection
<property> isn’t limited to injecting String values
The value attribute can also specify numeric (int, float, java.lang.Double, and so on) values as well as boolean values
№49 слайд
Содержание слайда: 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);
}
}}
№50 слайд
Содержание слайда: Example 5. beans.xml
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService">
<property name="message" value="I am Victor." />
<property name="repeat" value="3" />
</bean>
<bean id="helloKittyService" class="com.bionic.edu.HelloKittyService" />
<bean name="application" class="com.bionic.edu.Application">
<constructor-arg ref="helloWorldService" />
</bean>
№51 слайд
Содержание слайда: Example 5. Output
Hello, world! I am Victor.
Hello, world! I am Victor.
Hello, world! I am Victor.
See P215NumericInjection project for the full text
№52 слайд
Содержание слайда: Object Injection
The real value of DI is found in wiring an application’s collaborating objects together so that they don’t have to wire themselves together
Use ref attribute of <property> tag for this purpose
№53 слайд
Содержание слайда: Example 5. Reference Injection
Add getter&setter for greeting field of Application class
Change beans.xml as follows
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService">
<property name="message" value="I am Victor." />
</bean>
<bean id="helloKittyService" class="com.bionic.edu.HelloKittyService" />
<bean name="application" class="com.bionic.edu.Application">
<property name="greeting" ref="helloKittyService" />
</bean>
№54 слайд
Содержание слайда: Example 5. Output
Hello, Kitty!
№55 слайд
Содержание слайда: Example 5. Bean.xml Changes
<bean id="helloWorldService" class="com.bionic.edu.HelloWorldService">
<property name="message" value="I am Victor." />
</bean>
<bean id="helloKittyService" class="com.bionic.edu.HelloKittyService" />
<bean name="application" class="com.bionic.edu.Application">
<property name="greeting" ref="helloWorldService" />
</bean>
№56 слайд
Содержание слайда: Example 5. Output
Hello, world! I am Victor.
See P216PropertyRef project for the full text
№57 слайд
Содержание слайда: Auto Wiring
In large applications, the number of beans 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
№58 слайд
Содержание слайда: Auto-Wiring based on Annotations
Use the <context:component-scan> tag in 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
№59 слайд
Содержание слайда: The @Inject annotation
The @Inject annotation can be used to qualify:
a member
any method (including setter method) which takes the injected type as argument
№60 слайд
Содержание слайда: Autodiscovery
By default, <context:component-scan>looks for classes that are annotated 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
№61 слайд
Содержание слайда: @Component vs @Named
@Named and @Component annotations are used 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.
№62 слайд
Содержание слайда: Example 6. Annotations
Create Spring project with name P221FirstInject
Tune pom.xml file
Tune beans.xnm file
Create application classes
Run application
№63 слайд
Содержание слайда: Example 6. pom.xml
Add the following dependency to the project’s pom.xml file:
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
№64 слайд
Содержание слайда: Example 6. beans.xml
Create the following beans.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
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">
<context:component-scan base-package="com.bionic.edu" />
</beans>
№65 слайд
Содержание слайда: 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);
}
}
}
№66 слайд
Содержание слайда: 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();
}}
№67 слайд
Содержание слайда: Example 6. Output
Hello, world!
See P221FirstInject project for the full text
№68 слайд
Содержание слайда: Example 7. Autowiring by Name
Annotate HelloKittyService class with @Named:
package com.bionic.edu;
import javax.inject.Named;
@Named
public class HelloKittyService implements GreetingService {
public void sendGreeting(){
System.out.println("Hello, Kitty!");
}
}
№69 слайд
Содержание слайда: 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]
№70 слайд
Содержание слайда: The @Named Annotation
If multiple bean types are 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.
№71 слайд
Содержание слайда: 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();
}
. . . . . . . . . . . . . . . .
№72 слайд
Содержание слайда: Example 7. Output
Hello, world!
№73 слайд
Содержание слайда: Example 7. @Named Annotation
@Named
public class Application {
@Inject
@Named("helloKittyService")
GreetingService greeting = null;
. . . . . . . . . . . . . . . .
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
Application application = (Application)ctx.getBean("application");
application.start();
}
. . . . . . . . . . . . . . . .
№74 слайд
Содержание слайда: Example 7. Output
Hello, Kitty!
See P222InjectByName project for the full text
Скачать все slide презентации 2. Java Spring Core 3. Spring IoC Container одним архивом:
