策略管理类

//定义策略接口
public interface Strategy<T> {

    /**
     * 策略标识
     *
     * @return
     */
    T strategy();

}

// 定义策略管理器
package com.serviceshare.springboot.strategy;

import com.serviceshare.springboot.SpringContextInitialize;
import org.springframework.stereotype.Component;

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

/**
 * 策略对象管理器
 */
public class StrategyManager {

    private static final Map<Class<?>, Map<String, Object>> TYPE_CACHE = new HashMap<>();
    private static final Map<Class<? extends Strategy>, Map<String, Object>> TYPE_Strategy_CACHE = new HashMap<>();

    public static <T> T byName(Class<T> interfaceZ, String name) {
        Map<String, Object> cacheMap = Optional.ofNullable(TYPE_CACHE.get(interfaceZ)).orElse(new HashMap<>());
        final Object cacheBean = cacheMap.get(name);
        if (cacheBean != null) {
            return (T) cacheBean;
        }
        TYPE_CACHE.putIfAbsent(interfaceZ, cacheMap);
        final Object bean = SpringContextInitialize.context.getBean(name, interfaceZ);
        cacheMap.put(name, bean);
        return (T) bean;
    }

    public static <T> T byStrategy(Class<? extends Strategy> iStrategyClass, String Strategy) {
        Map<String, Object> cacheMap = Optional.ofNullable(TYPE_Strategy_CACHE.get(iStrategyClass)).orElse(new HashMap<>());
        final Object cacheBean = cacheMap.get(Strategy);
        if (cacheBean != null) {
            return (T) cacheBean;
        }

        TYPE_Strategy_CACHE.putIfAbsent(iStrategyClass, cacheMap);
        final Map<String, ? extends Strategy> beans = SpringContextInitialize.context.getBeansOfType(iStrategyClass);
        Strategy bean = null;
        for (Strategy beanX : beans.values()) {
            if (Strategy.equals(beanX.strategy().toString())) {
                bean = beanX;
                break;
            }
        }
        cacheMap.put(Strategy, bean);
        return (T) bean;
    }


}


//使用

BankPayService bankPayService = StrategyManager.byStrategy(BankPayService.class, productSubTypeEnum.toString());
PaymentTransQueryDTO paymentTransQueryDTO = bankPayService.payQuery(orderFlow);