Spring Boot_关于获取yml配置文件中的值

1 书写javabean

注意：一定要在主类下的子包建立才行，这样才能自动扫描组件。

package com.itrucheng.springboot.bean;

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

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

@Component      //下面的注解依赖于这个注解，必须要将对象放在spring容器中才能使用
@ConfigurationProperties(prefix = "person")     //书写这个是从yml文件中获取名为person的数据
public class Person {

    private String name;
    private Integer age;
    private Boolean boss;
    private Map<String, Object> maps;
    private List<Object> list;
    private Dog dog;

    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 getBoss() {
        return boss;
    }

    public void setBoss(Boolean boss) {
        this.boss = boss;
    }

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

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

    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;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", maps=" + maps +
                ", list=" + list +
                ", dog=" + dog +
                '}';
    }
}

application.yml

person:
  name: zhangsan
  age: 18
  boss: false
  maps: {k1: v1, k2: v2}
  list:
    - lisi
    - wangwu
  dog:
    name: wangcai
    age: 2

2 导入配置处理器依赖

在pom.xml中导入依赖，能够在yml、properties自动提示：

<dependency>
   <groupId>org.springframework.bootgroupId>
   <artifactId>spring-boot-configuration-processorartifactId>
   <optional>trueoptional>
dependency>

3 单元测试

在测试类中书写：

package com.itrucheng.springboot;

import com.itrucheng.springboot.bean.Person;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class SpringBoot02ConfigApplicationTests {


    @Autowired      //从容器中获取该person
    private Person person;

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

}

运行后得到控制台结果：
Person{name=‘zhangsan’, age=18, boss=false, maps={k1=v1, k2=v2}, list=[lisi, wangwu], dog=Dog{name=‘wangcai’, age=2}}