java 获取文件后缀及根据文件扩展名判断文件是否图片格式

public class ImageUtil {public static String pngSuffix = "png";public static String jpgSuffix = "jpg";public static String jpegSuffix = "jpeg";public static String bmpSuffix = "bmp";/*** 获取文件后缀* @param fileName 文件名称* @return 文件后缀*/public static String getFileExtension(String fileName) {String extension = fileName.substring(fileName.lastIndexOf(".") + 1);return extension;}/*** 根据文件扩展名判断文件是否图片格式* @param fileName 文件名称* @return 是否是图片*/public static boolean isImage(String fileName) {String extension = getFileExtension(fileName);String[] imageExtension = new String[]{"jpeg", "jpg", "bmp", "png"};for (String e : imageExtension){if (extension.toLowerCase().equals(e)) {return true;}}return false;}}