java spring annotations tutorial

OverviewTransaction management is critical for enterprise applications, and it guarantees data consistency even in the event of an exception.The Spring framework provides a consistent abstraction of transaction management, with the following characteristics: Provides a consistent programming model for different transactional APIs, such as JTA (Java Transaction API), JDBC, Hibernate, JPA (

Starting with spring 2.5, the functionality of a fully annotation-based configuration bean, assembly bean is provided. We can replace the original XML-based configuration with a note-based Spring IoC. Previously done projects using XML configuration to achieve, these days in a small project, the use of SPRINGMVC annotations, to share with you.Using annotationsSpr

$ There are two ways for spring to support caching: annotations-driven cache XML declaration caching enable caching support 。 If we use Java configuration, then one of the configuration classes can beAdd @enablecaching on Package com.lf; Import org.springframework.cache.annotation.EnableCaching; Import org.springframework.context.annotation.Configuration; /**

Before AspectJ5, writing ASPECTJ facets requires learning the extension of a Java language.AspectJ5 introduces key features that use annotations to create facets, and ASPECTJ annotations-oriented models make it very easy to turn any class into a tangent by annotations.1. Defining facets@Aspect Public classaudience{//be

Spring bean dependency injection, bean assembly and related annotations, springbeanDependency Injection Spring provides the following two methods for dependency injection: Property-based Setter method Injection Constructor Injection Setter method Injection Example: public class Communication { private Messaging messaging; /* * DI via Setter

1. Using annotations(1) Component scanSpecify a package path, and spring will automatically scan the packageAnd all the component classes of its sub-packages, when a component class definition is foundA specific annotation tag, the component is included in the springContainer. Equivalent to the Component scanning can override the (2) How to useStep1, in the configuration file, addLets the container scan the

labeling business layer components@Controller for labeling control-layer components, such as action in struts@Repository for labeling data Access Components, DAO components@Component refer to components, we can use this annotation when the component is poorly categorized.[Java]View PlainCopy @Service Public class Ventorserviceimpl implements Iventorservice { } @Repository Public class Ventordaoimpl implements Iventordao {

in which beans are initialized and destroyed@Primary: When multiple bean candidates appear in automatic assembly, the Bean Annotated as @primary will be the preferred one, or an exception will be thrownThe @Autowired is assembled by type by default, and can be used in conjunction with @qualifier annotations if we want to use the assemble by name. As follows:@Autowired @Qualifier ("Persondaobean") exist with multiple instances@PostConstruct initializa

")//DAO Layer//specify the scope of the object@Scope (scopename= "Singleton") Public classUser {PrivateString name; @Value ("18") PrivateInteger age; //@Autowired//Automatic Assembly//problem: If you match multiple types of objects that are consistent. You will not be able to choose which object to inject specifically. //@Qualifier ("Car2")//use @qualifier annotations to tell the spring container which n

-starter-web adds Tomcat and spring MVC, Auto-configuration will assume that you are developing a web app and setting up spring accordingly. Starter POMs and Auto-configuration: The purpose of design auto-configuration is to better use "Starter POMs", but these two concepts are not directly linked. You are free to choose a jar dependency other than starter Poms, and spr