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;

ad1
@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);
}
}