yaml格式，给Java类绑定数据

1、基本语法

# yaml 配置文件写法，代替properties写法
# 严格区分空格

# 内注入到配置类中
server:
  port: 8081

# 对象
student:
  name: jack
  age: 3

# 行内写法 map
student1: {
    
    name: jack, age: 3}

# array or collections
pets:
  - dog
  - cat
  - turtle

pets1: [dog, cat, turtle]

# 还可以写随机数 或者 uuid
uuid: ${
    
    random.uuid}
random: ${
    
    random.int}

2、给java bean注入值

• 核心

@ConfigurationProperties(prefix = "person")
// yaml 里面写person的属性
// 应用：数据源配置..

• application.yaml

# yaml 对象注入
dog:
  name: 八公
  age: 6

person:
  person-name: [email protected] # bitqian_${random.uuid}
  happy: false
  maps: {
    
    k1: v1, k2: v2}
  age: ${
    
    random.int}
  hobbyList:
    - girl
    - code
    - book
  dog:
    name: 拉布拉多
    age: 3

server:
  port:
    8081

# https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config

• 这里以dog，和person实体类对各种数据类型说明
• dog 这里用了properties加载配置，官方推荐ymal

package cn.bitqian.entity;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

/**
 * @author echo lovely
 * @date 2020/9/26 21:45
 */
@Component
// @ConfigurationProperties(prefix = "dog")
@PropertySource(value = "classpath:application.properties")
public class Dog {
    
    

    // value & SPEL 
    @Value("${server.port}")
    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 +
                '}';
    }
}

• person类

package cn.bitqian.entity;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.validation.annotation.Validated;

import javax.validation.constraints.Email;

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

/**
 * @author echo lovely
 * @date 2020/9/26 21:46
 */
@Component
// 对应前缀
@ConfigurationProperties(prefix = "person") // setter/getter 与yaml对应
@Validated // 数据校验
public class Person {
    
    

    @Email(message = "必须是邮箱格式")
    private String personName;
    private Boolean happy;
    private Integer age;

    private Map<String, Object> maps;
    private List<Object> hobbyList;
    private Dog dog;

    public Person() {
    
    }

    public Person(String name, Boolean happy, Integer age,
                  Map<String, Object> maps, List<Object> hobbyList, Dog dog) {
    
    
        this.personName = name;
        this.happy = happy;
        this.age = age;
        this.maps = maps;
        this.hobbyList = hobbyList;
        this.dog = dog;
    }

    public String getPersonName() {
    
    
        return personName;
    }

    public void setPersonName(String personName) {
    
    
        this.personName = personName;
    }

    public Boolean getHappy() {
    
    
        return happy;
    }

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

    public Integer getAge() {
    
    
        return age;
    }

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

    public Map<String, Object> getMaps() {
    
    
        return maps;
    }

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

    public List<Object> getHobbyList() {
    
    
        return hobbyList;
    }

    public void setHobbyList(List<Object> hobbyList) {
    
    
        this.hobbyList = hobbyList;
    }

    public Dog getDog() {
    
    
        return dog;
    }

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

    @Override
    public String toString() {
    
    
        return "Person{" +
                "personName='" + personName + '\'' +
                ", happy=" + happy +
                ", age=" + age +
                ", maps=" + maps +
                ", hobbyList=" + hobbyList +
                ", dog=" + dog +
                '}';
    }
}

3、测试

package cn.bitqian;

import cn.bitqian.entity.Dog;
import cn.bitqian.entity.Person;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;

@SpringBootTest
class Springboot02ApplicationTests {
    
    

    @Resource
    private Dog dog;

    @Autowired
    @Qualifier(value = "person")
    private Person person;

    @Test
    void contextLoads() {
    
    
        System.out.println(dog);
        System.out.println(person);
    }

}

age是随机的int，personName 做了邮箱验证