ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
Resource[] resources = resolver.getResources("data/layout/hahahhahahah.txt");
Resource resource = resources[0];
//获得文件流，在jar文件中，不能直接通过文件资源路径拿到文件，但可以在jar包中拿到文件流
InputStream inputStream = resource.getInputStream();
String json = TxtFileUtils.read(inputStream, "GBK");

package com.ruoyi.common.utils.txt;
import java.io.*;
import java.nio.charset.Charset;
public class TxtFileUtils {
    public static String read(InputStream fstream, String charset) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(fstream, Charset.forName(charset)));
            String s = br.readLine();
            return s;
        } finally {
            try {
                fstream.close();
            } catch (Exception e) {
            }
        }
    }
    public static String read(File f, String charset) throws Exception {
        FileInputStream fstream = new FileInputStream(f);
        try {
            int fileSize = (int) f.length();
            byte[] buffer = new byte[fileSize];
            fstream.read(buffer);
            return new String(buffer, charset);
        } finally {
            try {
                fstream.close();
            } catch (Exception e) {
            }
        }
    }
    public static void write(File f, String text, String charset) throws Exception {
        FileOutputStream fstream = new FileOutputStream(f);
        try {
            fstream.write(text.getBytes(charset));
        } finally {
            fstream.close();
        }
    }
}