springboot讀取配置文件中的集合對象

配置文件以下：

food-category.properties

static-food-categories[0].static-food-category-value.id=1
static-food-categories[0].static-food-category-value.key=MEAT
static-food-categories[0].static-food-category-value.name=肉類
static-food-categories[0].sub-categories[0].id=2
static-food-categories[0].sub-categories[0].key=PORK
static-food-categories[0].sub-categories[0].name=豬肉
static-food-categories[0].sub-categories[1].id=3
static-food-categories[0].sub-categories[1].key=BEEF
static-food-categories[0].sub-categories[1].name=牛肉
static-food-categories[1].static-food-category-value.id=4
static-food-categories[1].static-food-category-value.key=FRUITS
static-food-categories[1].static-food-category-value.name=水果
static-food-categories[1].sub-categories[0].id=5
static-food-categories[1].sub-categories[0].key=APPLE
static-food-categories[1].sub-categories[0].name=蘋果
static-food-categories[1].sub-categories[1].id=6
static-food-categories[1].sub-categories[1].key=ORANGE
static-food-categories[1].sub-categories[1].name=橘子

不難看出，配置文件中是多個對象集合，咱們只有要創建對應的類進行讀取便可。

1.建立對應的實體類，創建映射並讀取配置配置文件中的信息，使用時經過@Autowired註解注入便可

import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * <p>
 *  讀取food-category.properties配置文件中的類型信息
 * </p>
 *
 * @className FoodCategory
 * @author Sue
 * @create 2020/9/30 
 **/
@Data
@NoArgsConstructor
@Component
@ConfigurationProperties(prefix = "")
//不使用這個註解默認讀取application.yml
@PropertySource(value = "classpath:food-category.properties")
public class FoodCategory {

    private List<StaticFoodCategories> staticFoodCategories;

    @Data
    static class StaticFoodCategories {
        private StaticFoodCategoryValue staticFoodCategoryValue;
        private List<SubCategories> subCategories;
    }

    @Data
    static class StaticFoodCategoryValue {
        private String id;
        private String key;
        private String name;
    }

    @Data
    static class SubCategories {
        private String id;
        private String key;
        private String name;
    }

}

2.測試

@RunWith(SpringRunner.class)
@SpringBootTest
public class MyApplicationTests {

    @Autowired
    FoodCategory foodCategory;

    @Test
    public void contextLoads() {
        System.out.println(foodCategory);
    }
}