工厂+模板方法设计模式

有时后经常需要写很多的if判断语句，导致了代码的十分冗余，可读性不高，下面以工厂设计模式+策略设计模式提供一种可替代的写法，简化代码

工厂设计模式：Factory2

import com.google.common.collect.Maps;
import org.springframework.util.StringUtils;

import java.util.Map;

/**
 * 工厂设计模式
 */
public class Factory2 {
    private static Map<String, AbstractHandler> strategyMap = Maps.newHashMap();

    public static AbstractHandler getInvokeStrategy(String str) {
        return strategyMap.get(str);
    }

    public static void register(String str, AbstractHandler handler) {
        if (StringUtils.isEmpty(str) || null == handler) {
            return;
        }
        strategyMap.put(str, handler);
    }
}

 模板方法设计模式 AbstractHandler

/**
 * 模板方法设计模式
 */
public abstract class AbstractHandler implements InitializingBean {

    public void AAA(String name) {
        throw new UnsupportedOperationException();
    }

    public String BBB(String name) {
        throw new UnsupportedOperationException();
    }
}

 模板方式：LiSiHandler2

@Component
public class LiSiHandler2 extends AbstractHandler {

    @Override
    public String BBB(String name) {
        // 业务逻辑B
        return "李四完成任务B";
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Factory2.register("李四", this);
    }
}

  模板方式：TianQiHandler2

import org.springframework.stereotype.Component;

@Component
public class TianQiHandler2 extends AbstractHandler {

    @Override
    public void AAA(String name) {
        // 业务逻辑A
        System.out.println("田七完成任务A");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Factory2.register("田七", this);
    }
}

 模板方式：WangWuHandler2

import org.springframework.stereotype.Component;

@Component
public class WangWuHandler2 extends AbstractHandler {

    @Override
    public String BBB(String name) {
        // 业务逻辑B
        return "王五完成任务B";
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Factory2.register("王五", this);
    }
}