java-tutorials/spring-static-resources/src/main/java/com/baeldung/loadresourceasstring/ResourceReader.java

package com.baeldung.loadresourceasstring;

import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.FileCopyUtils;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UncheckedIOException;

import static java.nio.charset.StandardCharsets.UTF_8;


public class ResourceReader {

    public static String readFileToString(String path) {
        ResourceLoader resourceLoader = new DefaultResourceLoader();
        Resource resource = resourceLoader.getResource(path);
        return asString(resource);
    }

    public static String asString(Resource resource) {
        try (Reader reader = new InputStreamReader(resource.getInputStream(), UTF_8)) {
            return FileCopyUtils.copyToString(reader);
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }
}