Springcloud stream3.1版本后的使用加rabbitMQ

3.1之后改用函数式编程，本质是用jdk自己提供的函数来代替了@EnableBinding等注解。

现在有如下三个方法

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;

@Configuration
public class Scs_test {

    @Bean
    public Supplier<String> source(){
        return () -> {
            System.out.println("from source");
            return "hello world";
        };
    }

    @Bean
    public Function<String,String> function(){
        return msg -> {
            System.out.println("from function");
            return "add function + "+msg;
        };
    }

    @Bean
    public Consumer<String> sink(){
        return msg -> {
            System.out.println("from sink");
            System.out.println(msg);
        };