《重学Java设计模式》之 工厂方法模式

《重学Java设计模式》之 建造者模式

模拟发奖多种商品

工程结构

奖品发放接口

package com.yys.mes.design.factory.store;public interface ICommodity {/*** @Author Sherry* @Date 14:20 2024/11/6**/void sendCommodity(String uId, String commodityId, String bizId);
}

购物卡发放实现类

package com.yys.mes.design.factory.store.impl;import com.yys.mes.design.factory.store.ICommodity;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;@Service
@Slf4j
public class CardCommodityService implements ICommodity {@Overridepublic void sendCommodity(String uId, String commodityId, String bizId) {//购物卡log.info("购物卡发放成功！");}
}

优惠券发放实现类

package com.yys.mes.design.factory.store.impl;import com.yys.mes.design.factory.store.ICommodity;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;import java.util.Map;@Service
@Slf4j
public class CouponCommodityService implements ICommodity {@Overridepublic void sendCommodity(String uId, String commodityId, String bizId) {//优惠券发放log.info("优惠券发放成功！");}
}

实物发放实现类

package com.yys.mes.design.factory.store.impl;import com.yys.mes.design.factory.store.ICommodity;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;@Service
@Slf4j
public class GoodsCommodityService implements ICommodity {@Overridepublic void sendCommodity(String uId, String commodityId, String bizId) {//实物商品log.info("实物商品发放成功！");}
}

奖品类型工厂

通过 Map<String, ICommodity> 来存储所有的实现类。Spring 会自动将所有实现了 ICommodity 接口的 Bean 注入到这个 Map 中。我们可以通过传入类型（例如 "card"）来获取对应的实现类。

package com.yys.mes.design.factory.config;import com.yys.mes.design.factory.store.ICommodity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import java.util.Map;@Component
public class CommodityFactory {private final Map<String, ICommodity> commodityServices;@Autowiredpublic CommodityFactory(Map<String, ICommodity> commodityServices) {this.commodityServices = commodityServices;}// 根据类型返回对应的ICommodity实现public ICommodity getCommodityService(String type) {ICommodity commodityService = commodityServices.get(type + "CommodityService");if (commodityService == null) {throw new IllegalArgumentException("未知的奖品类型: " + type);}return commodityService;}
}

调用工厂

package com.yys.mes.design.factory.config;import com.yys.mes.design.factory.store.ICommodity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;@Component
public class StoreFactory {private final CommodityFactory commodityFactory;@Autowiredpublic StoreFactory(CommodityFactory commodityFactory) {this.commodityFactory = commodityFactory;}public void distributeCommodity(String type, String uId, String commodityId, String bizId) {// 通过工厂获取对应的ICommodity实现ICommodity commodityService = commodityFactory.getCommodityService(type);commodityService.sendCommodity(uId, commodityId, bizId);}
}

测试验证

package com.yys.mes.design.factory.Controller;import com.yys.mes.design.factory.config.StoreFactory;
import jakarta.annotation.Resource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/send")
public class ExampleController {@Resourceprivate StoreFactory storeFactory;@GetMapping("/distribute")public String distributeCommodity(@RequestParam String type, @RequestParam String uId,@RequestParam String commodityId, @RequestParam String bizId) {storeFactory.distributeCommodity(type, uId, commodityId, bizId);return "奖品发放成功!";}
}