spring中传参的问题

Question

package cn.itcast.mq.config;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FanoutConfig {
// itcast.fanout
@Bean
public FanoutExchange fanoutExchange(){
return new FanoutExchange("itcast.fanout");
}

// fanout.queue1
@Bean
public Queue fanoutQueue1(){
    return new Queue("fanout.queue1");
}

// 绑定队列1到交换机
@Bean
public Binding fanoutBinding1(Queue fanoutQueue1, FanoutExchange fanoutExchange){
    return BindingBuilder
            .bind(fanoutQueue1)
            .to(fanoutExchange);
}

// fanout.queue2
@Bean
public Queue fanoutQueue2(){
    return new Queue("fanout.queue2");
}

// 绑定队列2到交换机
@Bean
public Binding fanoutBinding2(Queue fanoutQueue2, FanoutExchange fanoutExchange){
    return BindingBuilder
            .bind(fanoutQueue2)
            .to(fanoutExchange);
}

@Bean
public Queue objectQueue(){
    return new Queue("object.queue");
}

}
请问这里的fanoutBinding方法没有被调用，参数是怎么传进来的？

Answer 1

只是业务代码里没有调用，实际调用是框架做的，框架在程序启动注册bean时就调用了，参数是框架根据自动注入传入的。
在fanoutBinding里打个断点，再启动服务，就能看到被调用了。