yaml语法讲解

YAML 是一个可读性高，用来表达数据序列化的格式。YAML也参考了其他的各种语言，包括：C语言、Python等，并从XML的数据格式中获得灵感。从而创造出的语言格式

$YAML语法$

# K是属性名 v是属性值
k: v
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$YAML表示对象$

people:
  name:kisa
  age:3
# 行内写法
people: {name:kisa,age:3}
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$YAML表示数组$

pets: 
  -cat,
  -dog
 # 行内写法
 pets: [cat,dog]
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$YAML给属性赋值$

$代码实例$

创建Dog实体类

package com.j.po;

import org.springframework.stereotype.Component;

/**
 * Created by jdx on 2022/3/17 上午10:47
 */
@Component
public class Dog {
    private String name;
    private Integer age;

    public Dog() {
    }

    public Dog(String name, Integer age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}
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创建People实体类

package com.j.po;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * Created by jdx on 2022/3/17 上午10:47
 */
//标注一个类为Spring容器的Bean，（把普通pojo实例化到spring容器中，相当于配置文件中的<bean id="" class=""/>）
@Component
//引用yaml文件并set值
@ConfigurationProperties(prefix = "people")
public class People {
    private String name;
    private Integer age;
    private Boolean happy;
    private Date birth;
    private List<Object> list;
    private Dog dog;
    private Map<String, Object> map;
    /*无参构造*/
    public People() {
    }

    /*有参构造*/
    public People(String name, Integer age, Boolean happy, Date birth, List<Object> list, Dog dog, Map<String, Object> map) {
        this.name = name;
        this.age = age;
        this.happy = happy;
        this.birth = birth;
        this.list = list;
        this.dog = dog;
        this.map = map;
    }
    /*get set方法*/

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Boolean getHappy() {
        return happy;
    }

    public void setHappy(Boolean happy) {
        this.happy = happy;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public List<Object> getList() {
        return list;
    }

    public void setList(List<Object> list) {
        this.list = list;
    }

    public Dog getDog() {
        return dog;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }

    public Map<String, Object> getMap() {
        return map;
    }

    public void setMap(Map<String, Object> map) {
        this.map = map;
    }

    /*toString方法*/
    @Override
    public String toString() {
        return "people{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", happy=" + happy +
                ", birth=" + birth +
                ", list=" + list +
                ", dog=" + dog +
                ", map=" + map +
                '}';
    }
}
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$解决SpringBootConfigurationAnnotationProcessornotconfigured$

<!--解决不影响运行的报错依赖：Spring Boot Configuration Annotation Processor not configured-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
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创建set值yaml文件

people:
  name: MJl
  age: 18
  happy: true
  birth: 1999/01/11
  list:
    - code
    - music
    - girl
  dog:
    name: 来福
    age: 3
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创建ApplicationTests测试类

package com.j;

import com.j.po.People;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;

@SpringBootTest
class ApplicationTests {

    @Resource
    private People people;
    @Test
    void contextLoads() {
        System.out.println(people);
    }

}

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$运行结果$

people{name='MJl', age=18, happy=true, birth=Mon Jan 11 00:00:00 CST 1999, list=[code, music, girl], dog=Dog{name='来福', age=3}, map=null}
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以上代码实现逻辑来看yaml是可以作为set注入的一种方式