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1. Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Spring Quick Start
Introducing the Spring Application Context and
Spring’s XML-based configuration language

2. 2
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Topics in this session
• Spring quick start
• Writing bean definitions
– Configuring objects
– Going beyond constructor instantiation
• Creating an application context
• Summary

3. 3
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
How Spring Works
Spring
ApplicationContext
Configuration
Instructions
Your Application Classes (POJOs)
Fully configured
application system
Ready for use
Creates

4. 4
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Your Application Classes
public class TransferServiceImpl implements TransferService {
public TransferServiceImpl(AccountRepository ar) {
this.accountRepository = ar;
}
…
}
public class JdbcAccountRepository implements AccountRepository {
public JdbcAccountRepository(DataSource ds) {
this.dataSource = ds;
}
…
}
Needed to load accounts from the database
Needed to perform money transfers
between accounts

5. 5
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Configuration Instructions
<beans>
<bean id=“transferService” class=“app.impl.TransferServiceImpl”>
<constructor-arg ref=“accountRepository” />
</bean>
<bean id=“accountRepository” class=“app.impl.JdbcAccountRepository”>
<constructor-arg ref=“dataSource” />
</bean>
<bean id=“dataSource” class=“com.oracle.jdbc.pool.OracleDataSource”>
<property name=“URL” value=“jdbc:oracle:thin:@localhost:1521:BANK” />
<property name=“user” value=“moneytransfer-app” />
</bean>
</beans>

6. 6
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Creating and Using the
Application
// Create the application from the configuration
ApplicationContext context =
new ClassPathXmlApplicationContext(“application-config.xml”);
// Look up the application service interface
TransferService service =
(TransferService) context.getBean(“transferService”);
// Use the application
service.transfer(new MonetaryAmount(“300.00”), “1”, “2”);

7. 7
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Inside the Spring Application
Context
// Create the application from the configuration
ApplicationContext context =
new ClassPathXmlApplicationContext(“application-config.xml”);
Application Context
OracleDataSource
dataSource
JdbcAccountRepository
accountRepository
TransferServiceImpl
transferService

8. 8
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Quick Start Summary
• Spring manages the lifecycle of the application
– All beans are fully initialized before they are used
• Beans are always created in the right order
– Based on their dependencies
• Each bean is bound to a unique id
– The id reflects the service the bean provides to clients
• The ApplicationContext works as a container,
encapsulating the bean implementations
chosen for a given deployment
– Conceals implementation details

9. 9
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
Topics in this session
• Spring quick start
• Writing bean definitions
– Configuring objects
– Going beyond constructor instantiation
• Creating an application context
• Summary

10. 10
Copyright 2005-2008 SpringSource. Copying, publishing or distributing without express written permission is prohibit
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