content: package com.ruoyi.common.utils.file;
  
  /**
   * 媒体类型工具类
   * 
   * @author ruoyi
   */
  public class MimeTypeUtils
  {
      public static final String IMAGE_PNG = "image/png";
  
      public static final String IMAGE_JPG = "image/jpg";
  
      public static final String IMAGE_JPEG = "image/jpeg";
  
      public static final String IMAGE_BMP = "image/bmp";
  
      public static final String IMAGE_GIF = "image/gif";
      
      public static final String[] IMAGE_EXTENSION = { "bmp", "gif", "jpg", "jpeg", "png" };
  
      public static final String[] FLASH_EXTENSION = { "swf", "flv" };
  
      public static final String[] MEDIA_EXTENSION = { "swf", "flv", "mp3", "wav", "wma", "wmv", "mid", "avi", "mpg",
              "asf", "rm", "rmvb" };
  
      public static final String[] VIDEO_EXTENSION = { "mp4", "avi", "rmvb" };
  
      public static final String[] DEFAULT_ALLOWED_EXTENSION = {
              // 图片
              "bmp", "gif", "jpg", "jpeg", "png",
              // word excel powerpoint
              "doc", "docx", "xls", "xlsx", "ppt", "pptx", "html", "htm", "txt",
              // 压缩文件
              "rar", "zip", "gz", "bz2",
              // 视频格式
              "mp4", "avi", "rmvb",
              // pdf
              "pdf" };
  
      public static String getExtension(String prefix)
      {
          switch (prefix)
          {
              case IMAGE_PNG:
                  return "png";
              case IMAGE_JPG:
                  return "jpg";
              case IMAGE_JPEG:
                  return "jpeg";
              case IMAGE_BMP:
                  return "bmp";
              case IMAGE_GIF:
                  return "gif";
              default:
                  return "";
          }
      }
  }
  