spring boot——配置文件——配置绑定—— @PropertySource 注解

@PropertySource

如果将所有的配置都集中到 application.properties 或 application.yml 中，那么这个配置文件会十分的臃肿且难以维护，

因此我们通常会将与 Spring Boot 无关的配置（例如自定义配置）提取出来，写在一个单独的配置文件中，并在对应的 JavaBean 上使用 @PropertySource 注解指向该配置文件。

1. 以 helloworld 为例，将与 person 相关的自定义配置移动到 src/main/resources 下的 person.properties 中（注意，必须把 application.properties 或 application.yml 中的相关配置删除），如下图。

person.properties 的配置如下。

person.last-name=李四
person.age=12
person.birth=2000/12/15
person.boss=false
person.maps.k1=v1
person.maps.k2=14
person.lists=a,b,c
person.dog.name=dog
person.dog.age=2

2. 在 Person 使用 @PropertySource 注解指向 person.properties，代码如下。

100

101

102

103

104

105

106

107

108

109

110

111

112

113

package net.biancheng.www.bean;
 
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 java.util.Date;
import java.util.List;
import java.util.Map;
 
@PropertySource(value = "classpath:person.properties")//指向对应的配置文件
@Component
@ConfigurationProperties(prefix = "person")
public class Person {
 
    private String lastName;
 
    private Integer age;
 
    private Boolean boss;
 
    private Date birth;
 
    private Map<String, Object> maps;
 
    private List<Object> lists;
 
    private Dog dog;
 
    public Person() {
 
    }
 
    public String getLastName() {
        return lastName;
    }
 
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
 
    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 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;
    }
 
    public Person(String lastName, Integer age, Boolean boss, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) {
        this.lastName = lastName;
        this.age = age;
        this.boss = boss;
        this.birth = birth;
        this.maps = maps;
        this.lists = lists;
        this.dog = dog;
    }
 
    @Override
    public String toString() {
        return "Person{" +
                "lastName='" + lastName + '\'' +
                ", age=" + age +
                ", boss=" + boss +
                ", birth=" + birth +
                ", maps=" + maps +
                ", lists=" + lists +
                ", dog=" + dog +
                '}';
    }
}