使用隐式设置器自动装配和ComponentScan将Spring xml转换为Java配置 [英] Converting spring xml to java configuration with implicit setter autowiring and ComponentScan

问题描述

我有两个班级:Vehicle.Tire和vehicle.Car.

I have two classes: vehicle.Tire and vehicle.Car.

package vehicle;
@Named
public class Tire {
    private String age;
}

package vehicle;
@Named
public class Car {
    private Tire tire;

    // Spring calls this setter because default-autowire="byName" of xml configuration
    public void setTire(Tire newTire) {
        this.tire = newTire;
    }

    public Tire getTire() {
        return this.tire;
    }
}

以下spring xml可以正常工作.

The following spring xml works fine.

<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-4.1.xsd
                       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
   default-autowire="byName">

  <context:component-scan base-package="vehicle" />

</beans>

我尝试在上面创建一个Java配置:

I tried to create a java configuration above:

@Configuration
@ComponentScan(basePackages={"vehicle"})
public VehicleConfig {
}

我不在类中使用@Inject或@Autowired注释，但是使用 autowires ，它可以与xml一起使用. 使用java配置，Car的setTire方法不称为:(

I'm not using @Inject nor @Autowired annotations in the classes, but spring autowires and it works with xml. Using java configuration, the method setTire of Car is not called :(

缺少什么?我如何使用组件扫描更改而无需修改汽车和轮胎类? Java中是否有 default-autowire ="byName" xml标记属性等效项?

What is missing? How can I change java configuration using component scan without modifying Car and Tire classes? Is there default-autowire="byName" xml tag attribute equivalent in java?

我使用上面的类来测试Java配置

I used the class above to test java configuration

@Test
public class VehicleConfigTest  {    
    public void testTire() {
        AnnotationConfigApplicationContext applicationContext = 
            new AnnotationConfigApplicationContext();

        applicationContext.register(VehicleConfig.class);

        applicationContext.refresh();

        Car car = applicationContext.getBean(Car.class);
        Assert.assertNotNull(car.getTire());
    }

}

谢谢.

推荐答案

在小枝Java配置中，没有等效于default-autowire ="byName"全局xml标签属性的

There is no equivalent in sprig java configuration to default-autowire="byName" global xml tag attribute.

更多，正确的注入方式是使用cdi的@Inject注释或spring的@Autowired注释.因此，应该修改Car类:

More, the right way to have injection is using @Inject annotation by cdi or @Autowired annotation by spring. So, the class Car should be modified:

package vehicle;

@Named
public class Car {

  @Inject
  private Tire tire;

  public Tire getTire() {
    return this.tire;
  }
}

现在，无论是xml还是java配置都可以使用.

Now, both xml or java configuration works.

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