ASP.NET中常用的文件上传下载方法 (转)
2008-04-20 21:08
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ASP.NET中常用的文件上传下载方法 文件的上传下载是我们在实际项目开发过程中经常需要用到的技术,这里给出几种常见的方法,本文主要内容包括:
1、如何解决文件上传大小的限制
2、以文件形式保存到服务器
3、转换成二进制字节流保存到数据库以及下载方法
4、上传Internet上的资源
第一部分:
首先我们来说一下如何解决ASP.NET中的文件上传大小限制的问题,我们知道在默认情况下ASP.NET的文件上传大小限制为2M,一般情况下,我们可以采用更改WEB.Config文件来自定义最大文件大小,如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<httpRuntime executionTimeout="300" maxRequestLength="40960" useFullyQualifiedRedirectUrl="false"/>这样上传文件的最大值就变成了4M,但这样并不能让我们无限的扩大MaxRequestLength的值,因为ASP.NET会将全部文件载入内存后,再加以处理。解决的方法是利用隐含的HttpWorkerRequest,用它的GetPreloadedEntityBody和ReadEntityBody方法从IIS为ASP.NET建立的pipe里分块读取数据。实现方法如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
IServiceProviderprovider=(IServiceProvider)HttpContext.Current;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
HttpWorkerRequestwr=(HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
byte[]bs=wr.GetPreloadedEntityBody();
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
.
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
if(!wr.IsEntireEntityBodyIsPreloaded())
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
intn=1024;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
byte[]bs2=newbyte
;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
while(wr.ReadEntityBody(bs2,n)>0)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
..
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}这样就可以解决了大文件的上传问题了。
第二部分:
下面我们来介绍如何以文件形式将客户端的一个文件上传到服务器并返回上传文件的一些基本信息
首先我们定义一个类,用来存储上传的文件的信息(返回时需要)。
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
public class FileUpLoad
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public FileUpLoad()
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 上传文件名称
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string FileName
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = value;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 上传文件路径
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string FilePath
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return filepath;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
filepath = value;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string filepath;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 文件扩展名
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string FileExtension
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileExtension = value;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
另外我们还可以在配置文件中限制上传文件的格式(App.Config):
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<?xml version="1.0" encoding="gb2312" ?>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<Application>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<FileUpLoad>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<Format>.jpg|.gif|.png|.bmp</Format>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
</FileUpLoad>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
</Application>
这样我们就可以开始写我们的上传文件的方法了,如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
public FileUpLoad UpLoadFile(HtmlInputFile InputFile,string filePath,string myfileName,bool isRandom)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
FileUpLoad fp = new FileUpLoad();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileName,fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string saveName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//建立上传对象
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
HttpPostedFile postedFile = InputFile.PostedFile;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = System.IO.Path.GetFileName(postedFile.FileName);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileExtension = System.IO.Path.GetExtension(fileName);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//根据类型确定文件格式
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
AppConfig app = new AppConfig();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string format = app.GetPath("FileUpLoad/Format");
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//如果格式都不符合则返回
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(format.IndexOf(fileExtension)==-1)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
throw new ApplicationException("上传数据格式不合法");
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//根据日期和随机数生成随机的文件名
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(myfileName != string.Empty)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = myfileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(isRandom)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Random objRand = new Random();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.DateTime date = DateTime.Now;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//生成随机文件名
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
saveName = date.Year.ToString() + date.Month.ToString() + date.Day.ToString() + date.Hour.ToString() + date.Minute.ToString()
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
+ date.Second.ToString() + Convert.ToString(objRand.Next(99)*97 + 100);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = saveName + fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string phyPath = HttpContext.Current.Request.MapPath(filePath);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//判断路径是否存在,若不存在则创建路径
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
DirectoryInfo upDir = new DirectoryInfo(phyPath);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(!upDir.Exists)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
upDir.Create();
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//保存文件
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
postedFile.SaveAs(phyPath + fileName);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fp.FilePath = filePath + fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fp.FileExtension = fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fp.FileName = fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
throw new ApplicationException("上传失败!");
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//返回上传文件的信息
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return fp;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
然后我们在上传文件的时候就可以调用这个方法了,将返回的文件信息保存到数据库中,至于下载,就直接打开那个路径就OK了。
第三部分:
这里我们主要说一下如何以二进制的形式上传文件以及下载。首先说上传,方法如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
public byte[] UpLoadFile(HtmlInputFile f_IFile)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//获取由客户端指定的上传文件的访问
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
HttpPostedFile upFile=f_IFile.PostedFile;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//得到上传文件的长度
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int upFileLength=upFile.ContentLength;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//得到上传文件的客户端MIME类型
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string contentType = upFile.ContentType;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
byte[] FileArray=new Byte[upFileLength];
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Stream fileStream=upFile.InputStream;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileStream.Read(FileArray,0,upFileLength);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return FileArray;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
这个方法返回的就是上传的文件的二进制字节流,这样我们就可以将它保存到数据库了。下面说一下这种形式的下载,也许你会想到这种方式的下载就是新建一个aspx页面,然后在它的Page_Load()事件里取出二进制字节流,然后再读出来就可以了,其实这种方法是不可取的,在实际的运用中也许会出现无法打开某站点的错误,我一般采用下面的方法:
首先,在Web.config中加入:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<add verb="*" path="openfile.aspx" type="RuixinOA.Web.BaseClass.OpenFile, RuixinOA.Web"/>
这表示我打开openfile.aspx这个页面时,系统就会自动转到执行RuixinOA.Web.BaseClass.OpenFile 这个类里的方法,具体实现如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Data;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.IO;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using Ruixin.WorkFlowDB;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using RXSuite.Base;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using RXSuite.Component;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using RuixinOA.BusinessFacade;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace RuixinOA.Web.BaseClass
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// NetUFile 的摘要说明。
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class OpenFile : IHttpHandler
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void ProcessRequest(HttpContext context)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//从数据库中取出要下载的文件信息
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
RuixinOA.BusinessFacade.RX_OA_FileManager os = new RX_OA_FileManager();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
EntityData data = os.GetFileDetail(id);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(data != null && data.Tables["RX_OA_File"].Rows.Count > 0)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
DataRow dr = (DataRow)data.Tables["RX_OA_File"].Rows[0];
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.Buffer = true;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.Clear();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.ContentType = dr["CContentType"].ToString();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(dr["CTitle"].ToString()));
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.BinaryWrite((Byte[])dr["CContent"]);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.Flush();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.End();
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public bool IsReusable
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
get
![](http://pw.cnblogs.com/Images/dot.gif)
{ return true;}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
执行上面的方法后,系统会提示用户选择直接打开还是下载。这一部分我们就说到这里。
第四部分:
这一部分主要说如何上传一个Internet上的资源到服务器。前面我们有一篇文章详细介绍了使用方法,这里我不再多说。
1、如何解决文件上传大小的限制
2、以文件形式保存到服务器
3、转换成二进制字节流保存到数据库以及下载方法
4、上传Internet上的资源
第一部分:
首先我们来说一下如何解决ASP.NET中的文件上传大小限制的问题,我们知道在默认情况下ASP.NET的文件上传大小限制为2M,一般情况下,我们可以采用更改WEB.Config文件来自定义最大文件大小,如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<httpRuntime executionTimeout="300" maxRequestLength="40960" useFullyQualifiedRedirectUrl="false"/>这样上传文件的最大值就变成了4M,但这样并不能让我们无限的扩大MaxRequestLength的值,因为ASP.NET会将全部文件载入内存后,再加以处理。解决的方法是利用隐含的HttpWorkerRequest,用它的GetPreloadedEntityBody和ReadEntityBody方法从IIS为ASP.NET建立的pipe里分块读取数据。实现方法如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
IServiceProviderprovider=(IServiceProvider)HttpContext.Current;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
HttpWorkerRequestwr=(HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
byte[]bs=wr.GetPreloadedEntityBody();
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
.
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
if(!wr.IsEntireEntityBodyIsPreloaded())
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
intn=1024;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
byte[]bs2=newbyte
;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
while(wr.ReadEntityBody(bs2,n)>0)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
..
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}这样就可以解决了大文件的上传问题了。
第二部分:
下面我们来介绍如何以文件形式将客户端的一个文件上传到服务器并返回上传文件的一些基本信息
首先我们定义一个类,用来存储上传的文件的信息(返回时需要)。
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
public class FileUpLoad
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public FileUpLoad()
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 上传文件名称
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string FileName
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = value;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 上传文件路径
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string FilePath
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return filepath;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
filepath = value;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string filepath;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// 文件扩展名
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string FileExtension
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
get
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
set
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileExtension = value;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
private string fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
另外我们还可以在配置文件中限制上传文件的格式(App.Config):
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<?xml version="1.0" encoding="gb2312" ?>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<Application>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<FileUpLoad>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<Format>.jpg|.gif|.png|.bmp</Format>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
</FileUpLoad>
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
</Application>
这样我们就可以开始写我们的上传文件的方法了,如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
public FileUpLoad UpLoadFile(HtmlInputFile InputFile,string filePath,string myfileName,bool isRandom)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
FileUpLoad fp = new FileUpLoad();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string fileName,fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string saveName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//建立上传对象
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
HttpPostedFile postedFile = InputFile.PostedFile;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = System.IO.Path.GetFileName(postedFile.FileName);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileExtension = System.IO.Path.GetExtension(fileName);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//根据类型确定文件格式
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
AppConfig app = new AppConfig();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string format = app.GetPath("FileUpLoad/Format");
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//如果格式都不符合则返回
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(format.IndexOf(fileExtension)==-1)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
throw new ApplicationException("上传数据格式不合法");
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//根据日期和随机数生成随机的文件名
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(myfileName != string.Empty)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = myfileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(isRandom)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Random objRand = new Random();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.DateTime date = DateTime.Now;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//生成随机文件名
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
saveName = date.Year.ToString() + date.Month.ToString() + date.Day.ToString() + date.Hour.ToString() + date.Minute.ToString()
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
+ date.Second.ToString() + Convert.ToString(objRand.Next(99)*97 + 100);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileName = saveName + fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string phyPath = HttpContext.Current.Request.MapPath(filePath);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//判断路径是否存在,若不存在则创建路径
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
DirectoryInfo upDir = new DirectoryInfo(phyPath);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(!upDir.Exists)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
upDir.Create();
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//保存文件
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
try
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
postedFile.SaveAs(phyPath + fileName);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fp.FilePath = filePath + fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fp.FileExtension = fileExtension;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fp.FileName = fileName;
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
catch
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
throw new ApplicationException("上传失败!");
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//返回上传文件的信息
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return fp;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
然后我们在上传文件的时候就可以调用这个方法了,将返回的文件信息保存到数据库中,至于下载,就直接打开那个路径就OK了。
第三部分:
这里我们主要说一下如何以二进制的形式上传文件以及下载。首先说上传,方法如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
public byte[] UpLoadFile(HtmlInputFile f_IFile)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
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{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//获取由客户端指定的上传文件的访问
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
HttpPostedFile upFile=f_IFile.PostedFile;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//得到上传文件的长度
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int upFileLength=upFile.ContentLength;
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//得到上传文件的客户端MIME类型
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string contentType = upFile.ContentType;
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byte[] FileArray=new Byte[upFileLength];
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![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Stream fileStream=upFile.InputStream;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
fileStream.Read(FileArray,0,upFileLength);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return FileArray;
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
这个方法返回的就是上传的文件的二进制字节流,这样我们就可以将它保存到数据库了。下面说一下这种形式的下载,也许你会想到这种方式的下载就是新建一个aspx页面,然后在它的Page_Load()事件里取出二进制字节流,然后再读出来就可以了,其实这种方法是不可取的,在实际的运用中也许会出现无法打开某站点的错误,我一般采用下面的方法:
首先,在Web.config中加入:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
<add verb="*" path="openfile.aspx" type="RuixinOA.Web.BaseClass.OpenFile, RuixinOA.Web"/>
这表示我打开openfile.aspx这个页面时,系统就会自动转到执行RuixinOA.Web.BaseClass.OpenFile 这个类里的方法,具体实现如下:
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
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using System.Data;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Web;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.IO;
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using Ruixin.WorkFlowDB;
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using RXSuite.Base;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using RXSuite.Component;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
using RuixinOA.BusinessFacade;
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace RuixinOA.Web.BaseClass
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
/**//// <summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
/// NetUFile 的摘要说明。
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
/// </summary>
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public class OpenFile : IHttpHandler
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void ProcessRequest(HttpContext context)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//从数据库中取出要下载的文件信息
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
RuixinOA.BusinessFacade.RX_OA_FileManager os = new RX_OA_FileManager();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
EntityData data = os.GetFileDetail(id);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if(data != null && data.Tables["RX_OA_File"].Rows.Count > 0)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
DataRow dr = (DataRow)data.Tables["RX_OA_File"].Rows[0];
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.Buffer = true;
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context.Response.Clear();
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context.Response.ContentType = dr["CContentType"].ToString();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(dr["CTitle"].ToString()));
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.BinaryWrite((Byte[])dr["CContent"]);
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.Flush();
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.End();
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public bool IsReusable
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://pw.cnblogs.com/Images/dot.gif)
{
![](http://pw.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://pw.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
get
![](http://pw.cnblogs.com/Images/dot.gif)
{ return true;}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://pw.cnblogs.com/Images/OutliningIndicators/None.gif)
执行上面的方法后,系统会提示用户选择直接打开还是下载。这一部分我们就说到这里。
第四部分:
这一部分主要说如何上传一个Internet上的资源到服务器。前面我们有一篇文章详细介绍了使用方法,这里我不再多说。
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