根据不同业务类型动态切换实现类（applicationContext.getBeansOfType实现）

　　本文以获取不同银行账户余额为例，具体实现如下：

　　整体结构：

　　

 

　　IBankService.java

/**
 * 银行接口
 */
public interface IBankService {

    /**
     * 查询账户余额
     */
    void getBalance();
}

　　AbcService.java

import org.springframework.stereotype.Service;

/** 农业银行实现类
 * @description:
 * @author: jack
 * @time: 2022/5/9 15:31
 */
@Service("abcService")
public class AbcService implements IBankService {

    @Override
    public void getBalance() {
        System.out.println("您的农行余额为1000元");
    }
}

　　CcbService.java

import org.springframework.stereotype.Service;

/** 建设银行实现类
 * @description:
 * @author: jack
 * @time: 2022/5/9 15:34
 */
@Service("ccbService")
public class CcbService implements IBankService {
    @Override
    public void getBalance() {
        System.out.println("您的建行余额为2000元");
    }
}

　　BankFactory.java

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;

import java.util.HashMap;
import java.util.Map;

/**
 * @description:
 * @author: jack
 * @time: 2022/5/9 15:24
 */
@Service("bankFactory")
public class BankFactory implements InitializingBean, ApplicationContextAware {

    // 实现接口的实现类集合
    private Map<String,IBankService> bankMap = new HashMap<>();
    // 声明上下文
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public void afterPropertiesSet() throws Exception {

        // 根据上下文获取实现接口的实现类
        Map<String,IBankService> mapBeans = applicationContext.getBeansOfType(IBankService.class);
        // 遍历集合并赋值
        for (String beanName : mapBeans.keySet()) {
            IBankService bean = mapBeans.get(beanName);
            bankMap.put(beanName, bean);
        }
    }

    public IBankService getBankService(String beanName) {
        return bankMap.get(beanName);
    }
}

　　BankTestController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @description:
 * @author: jack
 * @time: 2022/5/9 15:36
 */
@RestController
public class BankTestController {

    @Autowired
    private BankFactory bankFactory;

    @RequestMapping("/getBalance")
    public void getBalance(@RequestParam("bankName")String bankName) {
        IBankService bankService = bankFactory.getBankService(bankName+"Service");
        bankService.getBalance();
    }
}

　　测试调用：

　　http://localhost:8039/getBalance?bankName=abc

　　控制台打印：您的农行余额为1000元

　　http://localhost:8039/getBalance?bankName=ccb

　　控制台打印：您的建行余额为2000元