java 获取项目下resource路径下文件,在打成jar包后无法获取的问题

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最近在spring boot项目静态类中获取resource路径下文件，在idea中启动都可以获取，但是打包后变成了jar包 就无法获取到。

被获取的文件如下:

package com.niubo.util.ipFilter;

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

/**
 * @Author Xiao  HE
 * @Create Time 2019/9/7 13:52
 **/
@Component
public class DocUtil {

    // 模板文件名称 位于 resource/iptest下面
    private String[] ftlArray = {"ip2region.db"};

    public String createFtlFileByFtlArray() {
        String ftlPath = "iptest/";
        String path = "";
        for (int i = 0; i < ftlArray.length; i++) {
            path = createFtlFile(ftlPath, ftlArray[i]);
            if (null == path) {
            }
        }
        return path;
    }

    private String createFtlFile(String ftlPath, String ftlName) {
        try {
            //获取当前项目所在的绝对路径
            String proFilePath = System.getProperty("user.dir");
            //获取模板下的路径　
            String newFilePath = proFilePath + File.separator + "src" + File.separator + "main" + File.separator + "resources" + File.separator + ftlPath;
            newFilePath = newFilePath.replace("/", File.separator);
//检查项目运行时的src下的对应路径
            File newFile = new File(newFilePath + ftlName);
            if (newFile.isFile() && newFile.exists()) {
                return newFilePath;
            }
//当项目打成jar包会运行下面的代码，并且复制一份到src路径下（具体结构看下面图片）
            InputStream certStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(ftlPath + ftlName);
            byte[] certData = org.apache.commons.io.IOUtils.toByteArray(certStream);
            FileUtils.writeByteArrayToFile(newFile, certData);
            return newFilePath;
        } catch (Exception e) {
        }
        return null;
    }
}

package com.niubo.util.ipFilter;

import javax.servlet.http.HttpServletRequest;

/**
 * @author Drew
 * @title: Ipsettings
 * @projectName ybadmin
 * @description: TODO
 * @date 2019/5/31 13:37
 */

public class Ipsettings {

    //获取用户IP
    public static String getRemoteHost(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

}

package com.niubo.util.ipFilter;

import java.io.File;
import java.lang.reflect.Method;

import org.apache.ibatis.logging.stdout.StdOutImpl;
import org.lionsoul.ip2region.DataBlock;
import org.lionsoul.ip2region.DbConfig;
import org.lionsoul.ip2region.DbSearcher;
import org.lionsoul.ip2region.Util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * @Author Xiao  HE
 * @Create Time 2019/9/7 9:51
 **/
@Component
public class IPUtil {
    @Autowired
    DocUtil docUtil;
    public String getCityInfo(String ip){
        //db
        String dbPath = docUtil.createFtlFileByFtlArray()+"ip2region.db";
        System.out.println(dbPath);
        File file = new File(dbPath);

        if ( file.exists() == false ) {
            System.out.println("Error: Invalid ip2region.db file");
        }

        //查询算法
        int algorithm = DbSearcher.BTREE_ALGORITHM; //B-tree
        //DbSearcher.BINARY_ALGORITHM //Binary
        //DbSearcher.MEMORY_ALGORITYM //Memory
        try {
            DbConfig config = new DbConfig();
            DbSearcher searcher = new DbSearcher(config, dbPath);

            //define the method
            Method method = null;
            switch ( algorithm )
            {
                case DbSearcher.BTREE_ALGORITHM:
                    method = searcher.getClass().getMethod("btreeSearch", String.class);
                    break;
                case DbSearcher.BINARY_ALGORITHM:
                    method = searcher.getClass().getMethod("binarySearch", String.class);
                    break;
                case DbSearcher.MEMORY_ALGORITYM:
                    method = searcher.getClass().getMethod("memorySearch", String.class);
                    break;
            }

            DataBlock dataBlock = null;
            if ( Util.isIpAddress(ip) == false ) {
                System.out.println("Error: Invalid ip address");
            }

            dataBlock  = (DataBlock) method.invoke(searcher, ip);

            return dataBlock.getRegion();

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

        return null;
    }

}

  @Autowired
    IPUtil ipUtil;
    @RequestMapping(value = "/loginTest", method = RequestMethod.POST)
    public ResponseObj getIpTest(HttpServletRequest request){

        String remoteHost = getRemoteHost(request);

        String cityInfo = ipUtil.getCityInfo(remoteHost);

        return ResponseObj.createSuccessResponse(cityInfo);
    }

被获取文件路径: