springboot根据条件实例化bean

先定义一个接口，然后根据条件实例化接口的实现类。

public interface IMyBean {
    void hello();
}

1.区分环境，实例化bean

public class MyBeanDev implements IMyBean{
    @Override
    public void hello() {
        System.out.println("from dev...");
    }
}

@Bean
@Profile("dev")
public IMyBean myBeanDev(){
    MyBeanDev myBeanDev = new MyBeanDev();
    myBeanDev.hello();
    return myBeanDev;
}

2.实现condition接口，@Override matches方法，自定义生效条件

public class MyBeanMatch implements IMyBean, Condition {
    @Override
    public void hello() {
        System.out.println("up to matches...");
    }

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypemetadata metadata) {
        return "ok".equals(context.getEnvironment().getProperty("mybean.ok"));
    }
}

3.根据自定义配置属性，@ConditionalOnProperty

@Bean
@ConditionalOnProperty(name = {"mybean.ok"}, havingValue = "ok", matchIfMissing = false)
public IMyBean myBeanOK() {
    MyBeanOk myBeanOk = new MyBeanOk();
    myBeanOk.hello();
    return myBeanOk;
}