使用Map实现Bean的函数式注入【策略模式】

创建接口

package com.nowcoder.community.service;

public interface DemoService {

    void demo();
}

编写两个实现接口

A实现方法

package com.nowcoder.community.service.impl;

import com.nowcoder.community.service.DemoService;
import org.springframework.stereotype.Service;

@Service("A")
public class bService implements DemoService {
    @Override
    public void demo() {
       System.out.println("I am A");
    }
}

B实现方法

package com.nowcoder.community.service.impl;

import com.nowcoder.community.service.DemoService;
import org.springframework.stereotype.Service;

@Service("B")
public class aService implements DemoService {
    @Override
    public void demo() {
     System.out.println("I am B");
    }
}

调用方法

package com.nowcoder.community.controller;

import com.nowcoder.community.service.DemoService;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Map;

@Controller
@RequestMapping("/alpha")
@AllArgsConstructor
public class DemoController {

    private final Map<String, DemoService> demoService;

    @RequestMapping("/hello")
    @ResponseBody
    public String sayHello() {
        demoService.get("A").demo();
        System.out.println("A end");
        demoService.get("B").demo();
        System.out.println("B end");
    }

}