配置文件-yml的用法

同以前的 properties 用法，springboot 采用 yml 配置文件。

基本语法

• key: value；kv之间有空格
• 大小写敏感
• 使用缩进表示层级关系
• 缩进不允许使用tab，只允许空格
• 缩进的空格数不重要，只要相同层级的元素左对齐即可
• '#'表示注释
• 字符串无需加引号，如果要加，单引号表示字符串内容会被转义 、双引号表示字符串内容不转义

数据类型

1. 字面量：单个的、不可再分的值。date、boolean、string、number、null

k: v

2. 数组：一组按次序排列的值。array、list、queue

k: [v1,v2,v3]

或者

k:
  - v1
  - v2
  - v3

3. 对象：键值对的集合。map、hash、set、object

k: {k1:v1,k2:v2,k3:v3}

或者

k:
  k1: v1
  k2: v2
  k3: v3

示例

application.yml：

person:userName: zhangsanboss: falsebirth: 2019/12/12 20:12:33age: 18pet:name: tomcatweight: 23.4interests: [篮球,游泳]animal:- jerry- mariosalarys: [3999,4999.98,5999.99]pets: [{name: pet1,weight: 47},{name: pet2,weight: 50}]score:english:first: 30second: 40third: 50math: [131,140,148]chinese: {first: 128,second: 136}allPets:sick:- {name: tom}- {name: jerry,weight: 47}health: [{name: mario,weight: 47}]

配置类Person：

@Data
@Component
@ConfigurationProperties("person")
public class Person {private String userName;private Boolean boss;private Date birth;private Integer age;private Pet pet;private String[] interests;private List<String> animal;private Set<Double> salarys;private List<Pet> pets;private Map<String, Object> score;private Map<String, List<Pet>> allPets;@Overridepublic String toString() {return "Person{" +"userName='" + userName + '\\'' +",\\n boss=" + boss +",\\n birth=" + birth +",\\n age=" + age +",\\n pet=" + pet +",\\n interests=" + Arrays.toString(interests) +",\\n animal=" + animal +",\\n salarys=" + salarys +",\\n pets=" + pets +",\\n score=" + score +",\\n allPets=" + allPets +'}';}
}

依赖类Pet：

@Data
public class Pet {private String name;private Double weight;
}

启动类：

@SpringBootApplication
public class App 
{public static void main(String[] args) {ConfigurableApplicationContext context = SpringApplication.run(App.class, args);Person person = (Person) context.getBean("person");System.out.println(person);}
}

运行结果：

Person{userName='zhangsan',boss=false,birth=Thu Dec 12 20:12:33 CST 2019,age=18,pet=Pet(name=tomcat, weight=23.4),interests=[篮球, 游泳],animal=[jerry, mario],salarys=[3999.0, 4999.98, 5999.99],pets=[Pet(name=pet1, weight=47.0), Pet(name=pet2, weight=50.0)],score={english={first=30, second=40, third=50}, math={0=131, 1=140, 2=148}, chinese={first=128, second=136}},allPets={sick=[Pet(name=tom, weight=null), Pet(name=jerry, weight=47.0)], health=[Pet(name=mario, weight=47.0)]}}