springboot read resoures file

FileReaderHelper.java

import org.springframework.stereotype.Component;
import org.springframework.util.ResourceUtils;

import java.io.*;

@Component
public class FileReaderHelper {

    public String readToString(String fileName) {
        String encoding = "UTF-8";
        try {
            File file = ResourceUtils.getFile(ResourceUtils.CLASSPATH_URL_PREFIX + fileName);
            //File file = new File(fileName);
            Long fileLength = file.length();
            byte[] fileContent = new byte[fileLength.intValue()];

            FileInputStream in = new FileInputStream(file);
            in.read(fileContent);
            in.close();

            return new String(fileContent, encoding);
        } catch (FileNotFoundException e) {
            e.printStackTrace();


        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }
}