Spring annotation-driven development (a) - Project to build

I. Introduction

　　"Spring annotation-driven development" series is a Spring-based version 4.3.11.RELEASE, develop presentations by way of comment.

Second, the project to build

1. The reference dependencies

　　Create a maven project, the introduction of related libraries. We rely on the principle of a minimum reference only spring-context and junit package.

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.11.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

2. Fill the container Spring

/ ** 
 * @Configuration tell the Spring container This is a configuration file 
 * / 
@Configuration 
public  class MainConfig { 

    / ** 
     * @Bean inject a Bean, the default name for the method name, type of return value 
     * You can also name through the @Bean Bean injection property specifies the name 
     * / 
    @Bean (name = "Person" )
     public the Person Person () {
         return  new new the Person ( "Joe Smith", 13 ); 
    } 

}

　　Spring container above code is a simple method of assembly injection.

• @Configuration used to tell the Spring container This is a configuration file
• @Bean inject a Bean. By default, the name of the method name, type of return value. Bean can also specify the name of the injection by the name attribute of @Bean

3.Junit test

      Read by AnnotationConfigApplicationContext annotation configuration and component configuration register into Spring container, and then get the object from the container and used.

public  class MainConfigTest { 

    @Test 
    public  void Test () {
         // embodiment annotated by refreshing the container, the container needs to specify and register configuration class 
        the ApplicationContext applicationContext = new new AnnotationConfigApplicationContext (MainConfig. class );
         // get the object from the container 
        Person person = to applicationContext.getBean (the Person. class ); 
        Assert.assertNotNull (Person); 
        Assert.assertEquals (person.getName (), "Joe Smith" ); 
        Assert.assertEquals (person.getAge (), 13 is ); 
    } 

}

Third, the link 

"Spring annotation-driven development (a) - Project to build"

"Spring annotation-driven development (b) - Component injection"