How to convert Java files and Base64

/**
  * File to Base64
  * @param filePath
  * @return
  */
public static String convertFileToBase64(String filePath) {
    try {
        // Read the file as a byte array        byte[] fileBytes = ((filePath));

        // Convert byte array to Base64 encoded string        String base64EncodedString = ().encodeToString(fileBytes);

        return base64EncodedString;
    } catch (Exception e) {
        ();
        return null;
    }
}

/**
  * Base64 to file
  * @param base64String Base64 string
  * @param filePath The output file path
  * @param mimeType
  * MIME type:
  * Video video/mp4
  * PNG: image/png
  * JPEG: image/jpeg
  * GIF: image/gif
  * BMP: image/bmp
  * WebP: image/webp
  * @return
  */
public static boolean convertBase64ToFile(String base64String, String filePath, String mimeType) {
    try {
        // Convert Base64 encoded string to byte array        byte[] fileBytes = ().decode(base64String);
        // Create file header information        String header = "data:" + mimeType + ";base64,";
        byte[] headerBytes = ();
        // Merge file header and file content        byte[] combinedBytes = new byte[ + ];
        (headerBytes, 0, combinedBytes, 0, );
        (fileBytes, 0, combinedBytes, , );
        // Write byte array to file        ((filePath), fileBytes);
        return true;
    } catch (Exception e) {
        ();
        return false;
    }
}

package ;

import ;
import ;
import .*;

public class FileToBase64Converter {
    /**
      * File to Base64
      * @param filePath
      * @return
      */
    public static String convertFileToBase64(String filePath) {
        try {
            // Read the file as a byte array            byte[] fileBytes = ((filePath));

            // Convert byte array to Base64 encoded string            String base64EncodedString = ().encodeToString(fileBytes);

            return base64EncodedString;
        } catch (Exception e) {
            ();
            return null;
        }
    }

    /**
      * File to Base64 process
      */
    public static List<Map<String, String>> fileToBase64() {
        List<Map<String, String>> dataList = new ArrayList<>();
        // The image path to be read        String filePath = "D:\\repo\\java_base_test\\static\\img\\";
        // Read video path        String videoPath = "D:\\repo\\java_base_test\\static\\video\\cs.mp4";

        String fileToBase64 = convertFileToBase64(filePath);
        String videoToBase64 = convertFileToBase64(videoPath);

        if (fileToBase64 != null) {
            ("Picture conversion is successful");
            (new HashMap<String, String>() {{
                put("outPath", ("D:\\repo\\java_base_test\\static\\img\\GcJcSbJkBjVo_%", new Date().getTime()));
                put("base64Str", fileToBase64);
                put("mimeType", "image/png");
            }});
        } else {
            ("Picture conversion failed");
        }

        if (videoToBase64 != null) {
            ("Video conversion is successful");
            (new HashMap<String, String>() {{
                put("outPath", ("D:\\repo\\java_base_test\\static\\video\\cs_%s.mp4", new Date().getTime()));
                put("base64Str", videoToBase64);
                put("mimeType", "video/mp4");
            }});
        } else {
            ("Video conversion failed");
        }

        return dataList;
    }

    /**
      * Base64 to file
      * @param base64String Base64 string
      * @param filePath The output file path
      * @param mimeType
      * MIME type:
      * Video video/mp4
      * PNG: image/png
      * JPEG: image/jpeg
      * GIF: image/gif
      * BMP: image/bmp
      * WebP: image/webp
      * @return
      */
    public static boolean convertBase64ToFile(String base64String, String filePath, String mimeType) {
        try {
            // Convert Base64 encoded string to byte array            byte[] fileBytes = ().decode(base64String);
            // Create file header information            String header = "data:" + mimeType + ";base64,";
            byte[] headerBytes = ();
            // Merge file header and file content            byte[] combinedBytes = new byte[ + ];
            (headerBytes, 0, combinedBytes, 0, );
            (fileBytes, 0, combinedBytes, , );
            // Write byte array to file            ((filePath), fileBytes);
            return true;
        } catch (Exception e) {
            ();
            return false;
        }
    }

    /**
      * Base64 file conversion process
      * @param base64String
      * @param filePath
      */
    public static void base64ToFile(List<Map<String, String>> dataList) {
        for (Map<String, String> resMap : dataList) {
            boolean flag = convertBase64ToFile(("base64Str"), ("outPath"), ("mimeType"));
            if (flag) {
                (("outPath") + "Conversion successful");
            } else {
                (("outPath") + "Conversion failed");
            }
        }
    }

    public static void main(String[] args) {
        // File to Base64        List<Map<String, String>> dataList = fileToBase64();
        // Base64 to file        base64ToFile(dataList);
    }
}