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There is a newer version: 4.30.0

package liquibase.util;

import liquibase.Scope;
import liquibase.GlobalConfiguration;

import java.io.*;

public class FileUtil {
    
    private FileUtil() {
        throw new IllegalStateException("This utility class must not be instantiated. Sorry.");
    }

   public static String getContents(File file) throws IOException {
        if (!file.exists()) {
            return null;
        }
        try (
            FileInputStream fileInputStream = new FileInputStream(file);
        ) {
            
            return StreamUtil.readStreamAsString(fileInputStream);
        } catch (FileNotFoundException e) {
            return null;
        }
    }

    public static void write(String contents, File file) throws IOException {
        write(contents, file, false);
    }

    public static void write(String contents, File file, boolean append) throws IOException {
        file.getParentFile().mkdirs();

        try (
                FileOutputStream output = new FileOutputStream(file, append)
        ){
            StreamUtil.copy(new ByteArrayInputStream(contents.getBytes(GlobalConfiguration.OUTPUT_FILE_ENCODING.getCurrentValue())), output);
        }

    }

    public static String getFileNotFoundMessage(String physicalChangeLogLocation) {
        String message = "The file " + physicalChangeLogLocation + " was not found in" + System.lineSeparator();
        for (String location : Scope.getCurrentScope().getResourceAccessor().describeLocations()) {
            message += "    - " + location + System.lineSeparator();
        }
        message += "Specifying files by absolute path was removed in Liquibase 4.0. Please use a relative path or add '/' to the classpath parameter.";

        return message;
    }


}