资源文件：file-upload-dev.properties

file.imageUserFaceLocation=D:\\Environment\\apache-tomcat-9.0.46\\webapps\\foodie\\faces

类映射

package com.shiers.resource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
/**
 * Demo class
 *
 * @author shierS
 * @date 2021/6/6
 */
@Component  //组件标识，被spring扫描
@ConfigurationProperties(prefix = "file") //读取配置文件 prefix 指定属性的前缀
@PropertySource("classpath:file-upload-dev.properties") //配置对应配置文件的地址
public class FileUpload {
    private  String imageUserFaceLocation;
    public String getImageUserFaceLocation() {
        return imageUserFaceLocation;
    }
    public void setImageUserFaceLocation(String imageUserFaceLocation) {
        this.imageUserFaceLocation = imageUserFaceLocation;
    }
}

使用

@Autowired
private FileUpload fileUpload;
String fileSpace = fileUpload.getImageUserFaceLocation();