获取YML文件中的值

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web:
  uploadPath: ${web.upload_path}
  platformUrl: ${web.platform_url}

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@Value("${web.uploadPath}")
private String uploadpath;

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org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'yssCoursePortalController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'web.uploadpath' in string value "${web.uploadpath}"

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'web.uploadpath' in string value "${web.uploadpath}"

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package com.xinlianpu.village.utils;


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


import java.util.ArrayList;
import java.util.Collections;
import java.util.List;


@Component
@ConfigurationProperties(prefix = "web")
public class YmlValueUtil {
    private String uploadPath;
    private String platformUrl;

    private final Security security = new Security();

    public String getUploadPath() {
        return uploadPath;
    }

    public void setUploadPath(String uploadPath) {
        this.uploadPath = uploadPath;
    }

    public String getPlatformUrl() {
        return platformUrl;
    }

    public void setPlatformUrl(String platformUrl) {
        this.platformUrl = platformUrl;
    }

    public Security getSecurity() {
        return security;
    }

    public static class Security{
        private String userName;
        private List<String> roles = new ArrayList<>(Collections.singleton("USER"));
        public String getUserName() {
            return userName;
        }
        public void setUserName(String userName) {
            this.userName = userName;
        }
        public List<String> getRoles() {
            return roles;
        }
        public void setRoles(List<String> roles) {
            this.roles = roles;
        }
    }
}

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@Autowired
private YmlValueUtil ymlValueUtil;

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File file = new File(ymlValueUtil.getUploadPath() +  "/course" + course.getId() + ".html");