策略模式的简单使用-优快云博客

此博客介绍Java Spring Boot开发。先定义接口SaleFoodService，其功能为saleFood，接着编写实现类，创建SaleFood类用于调用，最后在Controller层调用，还给出了调用结果。

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首先我们定义一个接口：SaleFoodService，里面的功能位saleFood

public interface SaleFoodService {
    AjaxResult saleFood();
}

然后分别写出实现类：

@Service("Vegetables")
public class VegetablesServiceImpl implements SaleFoodService {
    @Resource
    private FoodMapper foodMapper;
    @Override
    public AjaxResult saleFood() {
        return new AjaxResult(true, foodMapper.findVegetables());
    }
}

@Service("Fruit")
public class FruitServiceImpl implements SaleFoodService {
    @Resource
    private FoodMapper foodMapper;

    @Override
    public AjaxResult saleFood() {
        return new AjaxResult(true, foodMapper.findFruit());
    }
}

创建一个SaleFood类用于调用

public class SaleFood {
    private SaleFoodService saleFoodService;

    public void setSaleFoodService(SaleFoodService saleFoodService) {
        this.saleFoodService = saleFoodService;
    }

    public AjaxResult saleFood(){
        return this.saleFoodService.saleFood();
    }
}

最后在Controller层进行调用即可

@RestController
@RequestMapping("food")
public class SaleFoodController {

    @Resource(name = "Fruit")
    private SaleFoodService FruitService;

    @Resource(name = "Vegetables")
    private SaleFoodService VegetablesService;

    @GetMapping("sale")
    public AjaxResult saleFood(@RequestParam("type") Integer type) {
        SaleFood saleFood = new SaleFood();
        if (type.equals(1)) {
            saleFood.setSaleFoodService(FruitService);
        } else {
            saleFood.setSaleFoodService(VegetablesService);
        }
        return saleFood.saleFood();
    }
}

调用结果：
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