文件上传无论在软件还是在网站上都十分常见,我今天再把它拿出来,讲一下,主要讲一下它的设计思想和实现技术,为了它的通用性,我把它做在了WEB.Service项目里,即它是针对服务器的,它的结构是关联UI(WEB)层与Service层(BLL)的桥梁.
结构
上传基类:
上传文件的接口规范:
接口的实现:
UI层调用WEB.Service层的上传功能:(附代码)
public class FileUploadController : Controller
{
WEB.Services.IFileUpload iFileUpload = null;
public FileUploadController()
{
iFileUpload = new WEB.Services.FileUpload();
}
#region 文件上传
public ActionResult uploadheadpic()
{
return View();
}
[HttpPost]
public ActionResult uploadheadpic(FormCollection formcollection)
{
if (Request.Files.Count > 0)
{
HttpPostedFileBase file = Request.Files[0];
Entity.Commons.VMessage vm = iFileUpload.Image(WEB.Services.UpLoadType.DownloadUrl, file);
if (vm.IsComplete)
TempData["PicUrl"] = "{result:true,msg:"" + vm[0].Replace(""", "") + ""}";
else
TempData["PicUrl"] = "{result:false,msg:"" + vm[0].Replace(""", "") + ""}";
}
return View();
}
#endregion
}
下面公布一下上传的基类代码:(如果有设计不合理的地方,欢迎大家留言)
namespace WEB.Services
{
#region 所需枚举
/// <summary>
/// 文件上传类型
/// </summary>
public enum UpLoadType
{
/// <summary>
/// 下载地址
/// </summary>
DownloadUrl = 0,
/// <summary>
/// 文件地址
/// </summary>
FileUrl = 1,
}
/// <summary>
/// 上传错误信息列举
/// </summary>
public enum WarnEnum
{
ImgContentType,
ImgContentLength,
ImgExtension,
}
#endregion
#region 文件上传基本服务类
/// <summary>
/// 文件上传基本服务类
/// </summary>
public abstract class FileUploadBase
{
/// <summary>
/// 图片MIME
/// </summary>
protected static List<string> imgMIME = new List<string>
{
"application/x-zip-compressed",
"application/octet-stream",
"application/x-compressed",
"application/x-rar-compressed",
"application/zip",
"application/vnd.ms-excel",
"application/vnd.ms-powerpoint",
"application/msword",
"image/jpeg",
"image/gif",
"audio/x-mpeg",
"audio/x-wma",
"application/x-shockwave-flash",
"video/x-ms-wmv",
"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"application/vnd.openxmlformats-officedocument.presentationml.presentation",
};
/// <summary>
/// 验证消息字典
/// </summary>
protected static Dictionary<WarnEnum, string> msgDIC = new Dictionary<WarnEnum, string>
{
{WarnEnum.ImgContentType ,"只能上传指定类型的文件！" },
{WarnEnum.ImgContentLength ,"只能上传文件大小为{0}以下！" },
{WarnEnum.ImgExtension , "文件的扩展文件不正确"}
};
/// <summary>
/// 相对地址字典
/// </summary>
protected static Dictionary<UpLoadType, string> relativePathDic = new Dictionary<UpLoadType, string>
{
{UpLoadType.DownloadUrl ,@"DownLoad/" },
{UpLoadType.FileUrl ,@"FileUpload/" },
};
/// <summary>
/// 图片后缀
/// </summary>
protected static string[] imgExtension = { "xls", "doc", "zip", "rar", "ppt", "docx", "xlsx", "pptx",
"mp3", "wma", "swf", "jpg", "jpeg", "gif" };
}
#endregion
}
文件上传实现类:
public class FileUpload : FileUploadBase, IFileUpload
{
#region 文件上级WWW服务器及图像服务器
public Entity.Commons.VMessage Image(UpLoadType type, HttpPostedFileBase hpf)
{
HttpRequest Request = HttpContext.Current.Request;
Entity.Commons.VMessage vmsg = new Entity.Commons.VMessage();
if (this.IsIamgeVaild(type, hpf))
{
string relativePath = string.Format(VConfig.BaseConfigers.LocationUploadPath, relativePathDic[type]);
string path = HttpContext.Current.Server.MapPath(relativePath);
#region 建立路径
DirectoryInfo di = new DirectoryInfo(path);
if (!di.Exists)
{
di.Create();
}
#endregion
string guid = Guid.NewGuid().ToString();
string fileName = string.Format("{0}{1}", guid, new FileInfo(hpf.FileName).Extension);//上传文件的名称
hpf.SaveAs(string.Format("{0}{1}", path, fileName));
vmsg.Clear();
vmsg.AddItem(string.Format("{0}://{1}{2}{3}",
Request.Url.Scheme,
Request.Url.Authority,
relativePath.Replace('\', '/'),
fileName
)
);
vmsg.AddItem(guid);
vmsg.IsComplete = true;
}
else
{
vmsg.AddItemRange(this.GetRuleViolations(type, hpf));
vmsg.IsComplete = false;
}
return vmsg;
}
public Entity.Commons.VMessage ImageToServer(string url)
{
Entity.Commons.VMessage vmsg = new Entity.Commons.VMessage();
Uri uri = new Uri(url);
string fileName = uri.Segments[uri.Segments.Length - 1];
string typeStr = uri.Segments[uri.Segments.Length - 2];
VCommons.Utils.FileUpLoad(
string.Format(BaseConfigers.DefaultUploadUri, typeStr.TrimEnd('/')),
HttpContext.Current.Server.MapPath(uri.LocalPath)
);
vmsg.IsComplete = true;
vmsg.AddItem(
string.Format("{0}://{1}/upload/{2}{3}",
HttpContext.Current.Request.Url.Scheme,
BaseConfigers.ImageServerHost,
typeStr,
fileName
)
);
return vmsg;
}
#endregion
#region 验证文件
internal bool IsIamgeVaild(UpLoadType type, HttpPostedFileBase hpf)
{
return this.GetRuleViolations(type, hpf).Count() == 0;
}
/// <summary>
/// 验证文件
/// </summary>
/// <param name="hpf"></param>
/// <returns></returns>
internal IEnumerable<string> GetRuleViolations(UpLoadType type, HttpPostedFileBase hpf)
{
if (!imgMIME.Contains(hpf.ContentType))// MIME
yield return msgDIC[WarnEnum.ImgContentType];
int contentLength = this.GetContentLengthByType(type);//文件大小
if (hpf.ContentLength > contentLength)
yield return string.Format(msgDIC[WarnEnum.ImgContentLength], contentLength / 1024);
if (!imgExtension.Contains(hpf.FileName.Substring(hpf.FileName.LastIndexOf('.') + 1)))//文件后缀
yield return msgDIC[WarnEnum.ImgExtension];
yield break;
}
#endregion
#region 根据 FileUpLoadContentLengthType 类型 获取相应的大小
/// <summary>
/// 根据 FileUpLoadContentLengthType 类型 获取相应的大小
/// </summary>
/// <param name="type">文件上传大小枚举值</param>
/// <returns>返回</returns>
int GetContentLengthByType(UpLoadType type)
{
switch (type)
{
case UpLoadType.DownloadUrl:
return 200000; //200M
case UpLoadType.FileUrl:
return 200000;
default:
throw new Exception("可能有错误");
}
}
#endregion
}