实战重构工厂模式

工厂模式

实战

待优化业务逻辑代码

/**
 * @author sunyang
 * @date 2019/1/30 10:32
 */
public class BizUser {

    public String getShowMoreNum(Long showNumRedis) {
        String  result= String.valueOf(showNumRedis);
        if (showNumRedis >= 10 && showNumRedis <= 99){
            String code = String.valueOf(showNumRedis);
            String first = code.substring(0, 1);
            result = first + "0+";
        }else if (showNumRedis >= 100 && showNumRedis <=999){
            String code = String.valueOf(showNumRedis);
            String first = code.substring(0, 1);
            result = first + "00+";
        }else if (showNumRedis >= 1000 && showNumRedis <=9999){
            String code = String.valueOf(showNumRedis);
            String first = code.substring(0, 1);
            result = first + "000+";
        }else if (showNumRedis > 9999){
            result = "9999+";
        }else{
            result= String.valueOf(showNumRedis);
        }
        return result;
    }
}

分析

从代码看的出来，不同条件下，执行的逻辑是不同的，可以把这种执行逻辑抽象出来，用多态的概念来定义不同的执行方式。

/**
 * 工厂模式
 * 从代码看的出来，不同的条件下，执行的逻辑是不同的，那么可以把这种执行逻辑抽象出来
 * 用多态的概念来定义不同的执行方式
 *
 * @author sunyang
 * @date 2019/1/30 10:51
 */
public abstract class AbstractBizUser2 {

    /**
     * 处理展示
     * @param showNumRedis 展示数量
     * @return
     */
    public abstract String process(Long showNumRedis);

}

/**
 * @author sunyang
 * @date 2019/1/30 10:57
 */
public class ShowOneExecutor extends AbstractBizUser2{

    @Override
    public String process(Long showNumRedis) {
        String result;
        String code = String.valueOf(showNumRedis);
        String first = code.substring(0, 1);
        result = first + "0+";
        return result;
    }
}

/**
 * @author sunyang
 * @date 2019/1/30 11:07
 */
public class ShowTwoExecutor extends AbstractBizUser2 {
    @Override
    public String process(Long showNumRedis) {
        String result;
        String code = String.valueOf(showNumRedis);
        String first = code.substring(0, 1);
        result = first + "00+";
        return result;
    }
}

/**
 * @author sunyang
 * @date 2019/1/30 11:09
 */
public class ShowThreeExecutor extends AbstractBizUser2 {
    @Override
    public String process(Long showNumRedis) {
        String result;
        String code = String.valueOf(showNumRedis);
        String first = code.substring(0, 1);
        result = first + "000+";
        return result;
    }
}

/**
 * @author sunyang
 * @date 2019/1/30 11:09
 */
public class ShowFourExecutor extends AbstractBizUser2 {
    @Override
    public String process(Long showNumRedis) {
        String result;
        result = "9999+";
        return result;
    }
}

/**
 * @author sunyang
 * @date 2019/1/30 11:10
 */
public class ShowOtherExecutor extends AbstractBizUser2 {
    @Override
    public String process(Long showNumRedis) {
        String result;
        result= String.valueOf(showNumRedis);
        return result;
    }
}

/**
 * 定义一个工厂来把需要处理逻辑给包起来
 *
 * @author sunyang
 * @date 2019/1/30 11:21
 */
public class ExecutorFactory {

    public AbstractBizUser2 getExecutor(Long showNumRedis){
        if (showNumRedis >= 10 && showNumRedis <= 99){
            return new ShowOneExecutor();
        }else if (showNumRedis >= 100 && showNumRedis <=999){
            return new ShowTwoExecutor();
        }else if (showNumRedis >= 1000 && showNumRedis <=9999){
            return new ShowThreeExecutor();
        }else if (showNumRedis > 9999){
            return new ShowFourExecutor();
        }else{
            return new ShowOtherExecutor();
        }
    }
}

结论

/**
 * @author sunyang
 * @date 2019/1/30 10:32
 */
public class BizUser {

    public String getShowMoreNum(Long showNumRedis) {
        /*String  result= String.valueOf(showNumRedis);
        if (showNumRedis >= 10 && showNumRedis <= 99){
            String code = String.valueOf(showNumRedis);
            String first = code.substring(0, 1);
            result = first + "0+";
        }else if (showNumRedis >= 100 && showNumRedis <=999){
            String code = String.valueOf(showNumRedis);
            String first = code.substring(0, 1);
            result = first + "00+";
        }else if (showNumRedis >= 1000 && showNumRedis <=9999){
            String code = String.valueOf(showNumRedis);
            String first = code.substring(0, 1);
            result = first + "000+";
        }else if (showNumRedis > 9999){
            result = "9999+";
        }else{
            result= String.valueOf(showNumRedis);
        }
        return result;*/
        ExecutorFactory executorFactory = new ExecutorFactory();
        AbstractBizUser2 bizUser2 = executorFactory.getExecutor(showNumRedis);
        return bizUser2.process(showNumRedis);
    }
}

/**
 * @author sunyang
 * @date 2019/1/30 12:32
 */
public class BizUserDemo {

    public static void main(String[] args) {
        long showNum = 1111;
        BizUser bizUser = new BizUser();
        String result = bizUser.getShowMoreNum(showNum);
        System.out.println("工厂模式实战后的结果 result：" + result);
    }
}

 

题外话

实战中的代码是简单可公开的逻辑代码

举一反三，去改造看不下去的代码