如何获取jar包中resource下的文件

maven工程打jar包，部署到服务器上以后，获取resource下文件的绝对路径是找不到该文件的

只能用流的方式获取，代码如下：

import lombok.extern.slf4j.Slf4j;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by dell on 2019/05/26.
 */
@Slf4j
public class FileTxtHandleUtil {

    public List<String[]> readTxt(String filePath) {
        log.info("txt文件路径:{}", filePath);
        try {
            List<String[]> result = new ArrayList<>();
            InputStream stream = getClass().getClassLoader().getResourceAsStream(filePath);
            BufferedReader br = null;
            try {
                br = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
                String lineTxt = null;
                while ((lineTxt = br.readLine()) != null) {
                    String[] dataStr = lineTxt.split("\t");
                    result.add(dataStr);
                }
                br.close();
            } catch (FileNotFoundException e) {
                log.error("FileNotFoundException:" + e);
            } catch (IOException e) {
                log.error("IOException:" + e);
            } finally {
                if (br != null) {
                    try {
                        br.close();
                    } catch (IOException e) {
                        log.error("close br error:" + e);
                    }
                }
            }
            return result;
        } catch (Exception e) {
            System.out.println("文件读取错误!");
        }
        return null;
    }

}

此工具在使用时只能实例化后调用方法，否则无效，调用方式如下