1. Using init-method and destroy-method attributes
2. Implementing InitializingBean and DisposableBean interfaces
3. Using @PostConstruct and @PreDestroy Annotations (available only in Spring >=2.5)
1. Using init-method and destroy-method attributes
Certain bean methods can designated as initializing and destroying methods using the init-method and destroy-method attributes. Like so:
<bean
id="studentService"
class="initMethod.StudentServiceImpl"
init-method="subscribe"
destroy-method="unsubscribe"/>
2. Implementing InitializingBean and DisposableBean interfaces
The bean can implement these methods InitializingBean.afterPropertiesSet() and DisposableBean.destroy(). Like so:
public class StudentServiceImpl implements StudentService, InitializingBean, DisposableBean {
@Override
public boolean isExists(long studentId) {
// A fake implementation
if ( studentId % 2 == 0 )
{
return true;
}
else
{
return false;
}
}
@Override
public void afterPropertiesSet() throws Exception
{
// subscribe logic goes here
}
@Override
public void destroy() throws Exception
{
// unsubscribe logic goes here
}
}
3. Using @PostConstruct and @PreDestroy Annotations
Note that both of these are JSR-250 annotations (here is a nice introduction to JSR-250 support introduced in spring 2.5).
@PostConstruct
public void subscribe()
{
// subscribe logic goes here
}
@PreDestroy
public void unsubscribe()
{
// unsubscribe logic goes here
}
