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策略模式的几种方式

1 简单实现

场景：策略模式实现不同类型的付款动作

1.1 创建策略接口

package com.per.strategy;/*** @Title Strategy* @Description TODO* @Author Lee* @Date 2024-01-20*/
public interface PayStrategy {/*** 付款方式** @return*/String getType();/*** 执行策略*/void process();}

1.2 实现付款方式

1.2.1 微信付款

package com.per.strategy.service;import com.per.strategy.PayStrategy;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;/*** @Title WeChatPayService* @Description TODO* @Author Lee* @Date 2024-01-20*/
@Component
@Slf4j
public class WeChatPayService implements PayStrategy {@Overridepublic String getType() {return "weChatPay";}@Overridepublic void process() {log.info("微信付款100元");}
}

1.2.2 支付宝付款

package com.per.strategy.service;import com.per.strategy.PayStrategy;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;/*** @Title AliPayService* @Description TODO* @Author Lee* @Date 2024-01-20*/
@Component
@Slf4j
public class AliPayService implements PayStrategy {@Overridepublic String getType() {return "aliPay";}@Overridepublic void process() {log.info("支付宝付款100元");}
}

1.3 创建策略调度器

package com.per.strategy;/*** @Title PayStrategyHandler* @Description TODO* @Author Lee* @Date 2024-01-20*/
public interface PayStrategyHandler {/*** 执行策略** @param type 付款方式*/void run(String type);
}

1.4 创建配置类

package com.per.strategy.config;import com.per.strategy.PayStrategy;
import com.per.strategy.PayStrategyHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;/*** @Title PayStrategyConfig* @Description TODO* @Author Lee* @Date 2024-01-20*/
@Configuration
public class PayStrategyConfig {/*** 注册策略调度器** @param payStrategies* @return*/@Beanpublic PayStrategyHandler handler(List<PayStrategy> payStrategies) {Map<String, PayStrategy> strategyMaps = payStrategies.stream().collect(Collectors.toMap(PayStrategy::getType, item -> item));
//        return new PayStrategyHandler() {
//            @Override
//            public void run(String type) {
//                strategyMaps.get(type).process();
//            }
//        };return type -> strategyMaps.get(type).process();}
}

实际使用如下：

package com.per.controller;import com.per.strategy.PayStrategyHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;/*** @Title UserController* @ProjectName spring-boot-demo* @Description TODO* @Author Lee* @Date 2024-01-17*/
@RestController
public class UserController {@Autowiredprivate PayStrategyHandler handler;/*** 用户付款** @return*/@RequestMapping(value = "strategy", method = RequestMethod.GET)public String pay() {String type = "weChatPay";handler.run(type);return "付款成功";}
}