@Component//声明为spring组件

public class CopyFileUtil{

    @Autowired

    private DataFileManager dataFileManager;//注入service层

    private static CopyFileUtil copyFileUtil;//在spring初始化之前初始化一个静态类

    public void setDataFileManager(DataFileManager dataFileManager) {//service类的set方法

        this.dataFileManager = dataFileManager;

    }

    @PostConstruct//通过@PostConstruct方法实现Bean初始化之前和销毁之前的自定义操作

    public void init(){

        copyFileUtil=this;

        copyFileUtil.dataFileManager=this.dataFileManager;

    }

}

public String getNewFileName(String oldName)throws Exception{

        String fileName=copyFileUtil.dataFileManager.getFileName(oldName);

        if(null!=fileName){

            return fileName;

        }

        return null;

    }