93 lines
2.6 KiB
C#
93 lines
2.6 KiB
C#
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using System;
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using System.IO;
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namespace Alipay.AopSdk.Core.Util
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{
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/// <summary>
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/// 文件元数据。
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/// 可以使用以下几种构造方法：
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/// 本地路径：new FileItem("C:/temp.jpg");
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/// 本地文件：new FileItem(new FileInfo("C:/temp.jpg"));
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/// 字节流：new FileItem("abc.jpg", bytes);
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/// </summary>
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public class FileItem
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{
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private byte[] content;
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private readonly FileInfo fileInfo;
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private string fileName;
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private string mimeType;
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/// <summary>
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/// 基于本地文件的构造器。
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/// </summary>
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/// <param name="fileInfo">本地文件</param>
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public FileItem(FileInfo fileInfo)
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{
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if (fileInfo == null || !fileInfo.Exists)
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throw new ArgumentException("fileInfo is null or not exists!");
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this.fileInfo = fileInfo;
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}
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/// <summary>
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/// 基于本地文件全路径的构造器。
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/// </summary>
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/// <param name="filePath">本地文件全路径</param>
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public FileItem(string filePath)
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: this(new FileInfo(filePath))
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{
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}
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/// <summary>
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/// 基于文件名和字节流的构造器。
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/// </summary>
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/// <param name="fileName">文件名称（服务端持久化字节流到磁盘时的文件名）</param>
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/// <param name="content">文件字节流</param>
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public FileItem(string fileName, byte[] content)
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{
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if (string.IsNullOrEmpty(fileName)) throw new ArgumentNullException("fileName");
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if (content == null || content.Length == 0) throw new ArgumentNullException("content");
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this.fileName = fileName;
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this.content = content;
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}
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/// <summary>
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/// 基于文件名、字节流和媒体类型的构造器。
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/// </summary>
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/// <param name="fileName">文件名（服务端持久化字节流到磁盘时的文件名）</param>
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/// <param name="content">文件字节流</param>
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/// <param name="mimeType">媒体类型</param>
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public FileItem(string fileName, byte[] content, string mimeType)
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: this(fileName, content)
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{
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if (string.IsNullOrEmpty(mimeType)) throw new ArgumentNullException("mimeType");
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this.mimeType = mimeType;
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}
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public string GetFileName()
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{
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if (fileName == null && fileInfo != null && fileInfo.Exists)
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fileName = fileInfo.FullName;
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return fileName;
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}
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public string GetMimeType()
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{
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if (mimeType == null)
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mimeType = AopUtils.GetMimeType(GetContent());
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return mimeType;
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}
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public byte[] GetContent()
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{
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if (content == null && fileInfo != null && fileInfo.Exists)
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using (Stream fileStream = fileInfo.OpenRead())
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{
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content = new byte[fileStream.Length];
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fileStream.Read(content, 0, content.Length);
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}
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return content;
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}
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}
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}
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