Spring Boot的yml、properties配置文件自动注入详解

骑猪看日落 2021-11-05 13:22 583阅读 0赞

**Spring Boot的yml、properties配置文件自动注入详解**  
**1.pom.xml文件导入相关组件**

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

**2.创建yml、properties配置文件**  
*这边我们是使用IDEA快捷搭建SpringBoot项目，会自动生成一个application.properties配置文件。然后我们自己再新建一个application.yml、person.properties两个配置文件用于后续的功能实现及对比。*![新建配置文件][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjI4OTM4Mw_size_16_color_FFFFFF_t_70]  
**2.创建Person、Dog两个实体类，后续使用配置文件自动注入实体类的数据**

1.  Person实体类

package com.cd.springboot02config.beanT;
    
    
    import java.util.Date;
    import java.util.List;
    import java.util.Map;
    
    /**
     * @Author: Chendc
     * @Date: 2019/8/7 9:17
     */
    @Component
    @ConfigurationProperties(prefix = "person")
    public class Person {
    
        /**
         * 基本类型数据
         */
        private String name;
        private Integer age;
        private Boolean isMan;
        private Date birth;
        /**
         * 复杂类型数据
         */
        private Map<String,Object> maps;
        private List<Object> lists;
        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 getMan() {
            return isMan;
        }
    
        public void setMan(Boolean man) {
            isMan = man;
        }
    
        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 +
                    ", isMan=" + isMan +
                    ", birth=" + birth +
                    ", maps=" + maps +
                    ", lists=" + lists +
                    ", dog=" + dog +
                    '}';
        }
    }

1.  Dog实体类

package com.cd.springboot02config.beanT;
    
    /**
     * @Author: Chendc
     * @Date: 2019/8/7 9:20
     */
    public class Dog {
        private String name;
        private Integer 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 +
                    '}';
        }
    }

**3.实现配置文件自动注入需要用到的注解**  
@Component、@ConfigurationProperties、@Autowired、@PropertySource  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjI4OTM4Mw_size_16_color_FFFFFF_t_70 1]  
**3.编写配置文件需要注入的数据**

1.  application.properties

#配置person的值
    person.name=王五application
    person.age=24
    person.birth=2012/13/14
    person.isMan=false
    person.maps.k1=v1
    person.maps.k2=v2
    person.lists=a1,b2,c3
    person.dog.name=dog
    person.dog.age=2

2.application.yml

person:
       name: 张三yml
       age: 18
       isMan: true
       birth: 2012/12/12
       maps: {k1: v1,k2: v2}
       lists:
         - lisi
         - zhaoliu
       dog:
           name: 小狗
           age: 2

3.person.properties

#配置person的值
    person.name=张飞person
    person.age=24
    person.birth=2012/13/14
    person.isMan=false
    person.maps.k1=v1
    person.maps.k2=v2
    person.lists=a1,b2,c3
    person.dog.name=dog
    person.dog.age=2

**4.使用SpringBoot提供的单元测试类，进行测试**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjI4OTM4Mw_size_16_color_FFFFFF_t_70 2]

1.  测试一：三个配置文件都存在Person数据，不去指明读取哪个配置文件，测试配置文件的优先级。  
    测试结果：多个配置文件在同个目录下优先注入application.properties数据  
    如图所示：![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjI4OTM4Mw_size_16_color_FFFFFF_t_70 3]  
    2.测试二：注释掉application.properties文件，测试application.yml和自定义.properties文件优先级。  
    测试结果：application.yml大于自定义.properties文件的优先级  
    如图所示：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjI4OTM4Mw_size_16_color_FFFFFF_t_70 4]  
    3.测试三：使用@PropertySource(value = \{“classpath:person.properties”\})注解指定读取配置文件数据注入。  
    如图所示：![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjI4OTM4Mw_size_16_color_FFFFFF_t_70 5]  
    **以上就是一些简单的探索了，要是大家有啥高端玩法记得评论、私信我鸭，一起进步！**

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