yaml方式注入配置文件

1、在springboot项目中的resources目录下新建一个文件 application.yml

2、编写一个实体类 Dog；

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "dog")
public class Dog {


    private String firstName;
    private Integer age;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public Integer getAge() {
        return age;
    }

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

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

    public Dog() {
    }

    @Override
    public String toString() {
        return "Dog{" +
                "firstName='" + firstName + '\'' +
                ", age=" + age +
                '}';
    }
}

3、我们在编写一个复杂一点的实体类：Person 类

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
import org.springframework.validation.annotation.Validated;

import javax.validation.constraints.Email;
import java.util.Date;
import java.util.List;
import java.util.Map;

@Component
@ConfigurationProperties(prefix = "person")
@Validated //数据校验
//加载指定的配置文件
//@PropertySource(value = "classpath:xiaobai.properties")
public class Person {
    //spring的EL表达式
    //@Value("${name}")
    @Email(message = "email geshi error")
    private String name;
    private Integer age;
    private Boolean happy;
    private Date birth;
    private Map<String,Object> maps;
    private List<Object> lists;
    private Dog dog;

    public Person(){
    }

    public Person(String name, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) {
        this.name = name;
        this.age = age;
        this.happy = happy;
        this.birth = birth;
        this.maps = maps;
        this.lists = lists;
        this.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 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 Map<String, Object> getMaps() {
        return maps;
    }

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

    public List<Object> getLists() {
        return lists;
    }

    public void setLists(List<Object> lists) {
        this.lists = lists;
    }

    public Dog getDog() {
        return dog;
    }

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

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

4、我们来使用yaml配置的方式进行注入，大家写的时候注意区别和优势，我们编写一个yaml配置

person:
  name: xiaobai
  age: 3
  happy: true
  birth: 2001/02/03
  maps: {k1: v1,k2: v2}
  lists:
    - code
    - music
    - girl
  dog:
    name: wangcai
    age: 3

dog:
  first-name: xiaohuang
  age: 3

5、IDEA 提示，springboot配置注解处理器没有找到，让我们看文档，我们可以查看文档，找到一个依 赖！

 

 

       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

6、确认以上配置都OK之后，我们去测试类中测试一下：

import com.bai.pojo.Dog;
import com.bai.pojo.Person;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class Springboot03ConfigApplicationTests {

    @Autowired
    private Dog dog;

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

    }

}