zhywebcore/learun.core/learun.util/FileHelper.cs

using System.IO;

namespace learun.util
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.09.18
	/// 描 述：文件帮助类
	/// </summary>
	public static class FileHelper
	{
		/// <summary>
		/// 读取根目录下面的文件
		/// </summary>
		/// <param name="filePath">文件路径</param>
		/// <returns></returns>
		public static byte[] ReadRoot(string filePath)
		{
			string rootPath = ConfigHelper.GetValue<string>("baseDir") + "/wwwroot";
			string path = rootPath + filePath;
			return File.ReadAllBytes(path);
		}

		/// <summary>
		/// 读取缓存文件
		/// </summary>
		/// <param name="fileName">文件路径</param>
		/// <returns></returns>
		public static byte[] ReadCache(string fileName)
		{
			string rootPath = ConfigHelper.GetValue<string>("baseDir") + "/cache/";
			string path = rootPath + fileName;
			return File.ReadAllBytes(path);
		}

		/// <summary>
		/// 读取缓存文件
		/// </summary>
		/// <param name="fileName">文件路径</param>
		/// <param name="buffer">文件数据</param>
		/// <returns></returns>
		public static void WriteCache(string fileName, byte[] buffer)
		{
			string rootPath = ConfigHelper.GetValue<string>("baseDir") + "/cache/";
			if (!Directory.Exists(rootPath))
			{
				Directory.CreateDirectory(rootPath);
			}
			string path = rootPath + fileName;
			FileInfo file = new FileInfo(path);

			FileStream fs = file.Create();
			fs.Write(buffer, 0, buffer.Length);
			fs.Close();
		}

		/// <summary>
		/// 读取缓存文件
		/// </summary>
		/// <param name="fileName">文件路径</param>
		/// <returns></returns>
		public static void RemoveCache(string fileName)
		{
			string rootPath = ConfigHelper.GetValue<string>("baseDir") + "/cache/";
			string path = rootPath + fileName;
			File.Delete(path);
		}

		/// <summary>
		/// 读取文件
		/// </summary>
		/// <param name="filePath">文件绝对路径</param>
		/// <returns></returns>
		public static byte[] Read(string filePath)
		{
			return File.ReadAllBytes(filePath);
		}

		/// <summary>
		/// 获取文件的传输类型
		/// </summary>
		/// <param name="fileExt">文件扩展名</param>
		/// <returns></returns>
		public static string getContentType(string fileExt)
		{
			string contentType = "";
			switch (fileExt?.ToLower())
			{
				case "jpg":
				case "jpeg":
				case "gif":
				case "png":
				case "webp":
					contentType = "image/" + fileExt.ToLower();
					break;

				case "bmp":
					contentType = "application/x-bmp";
					break;

				case "pdf":
					contentType = "application/" + fileExt.ToLower();
					break;

				case "txt":
					contentType = "text/plain";
					break;

				case "csv":
					contentType = "";
					break;

				case "html":
					contentType = "text/html";
					break;

				default:
					contentType = "application/octet-stream";
					break;
			}

			return contentType;
		}
	}
}