图片上传后台代码（图片上传程序）

本篇文章给大家谈谈图片上传后台代码，以及图片上传程序对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

• 1、如何编写上传和下载图片的前台代码和后台代码？？？？
• 2、app怎么上传图片到java后台？java后台处理的具体代码是怎么写的？
• 3、上传图片到服务器如何写代码？

如何编写上传和下载图片的前台代码和后台代码？？？？

";}else{string filepath = FileUpload1.PostedFile.FileName; string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1); string serverpath = Server.MapPath("images/") + filename; FileUpload1.PostedFile.SaveAs(serverpath); this.lb_info.Text = "上传成功！";}}catch (Exception ex){this.lb_info.Text = "上传发生错误！原因是：" + ex.ToString();}}}前台代码：table style="width: 343px"trtd style="width: 100px" 单文件上传/td

app怎么上传图片到java后台？java后台处理的具体代码是怎么写的？

使用一些已有的组件帮助我们实现这种上传功能。常用的上传组件：Apache的CommonsFileUploadJavaZoom的UploadBeanjspSmartUpload以下，以FileUpload为例讲解1、在jsp端要注意enctype="multipart/form-data"然后只需要放置一个file控件，并执行submit操作即可2、web端核心代码如下：publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{request.setCharacterEncoding("UTF-8");DiskFileItemFactoryfactory=newDiskFileItemFactory();ServletFileUploadupload=newServletFileUpload(factory);try{Listitems=upload.parseRequest(request);Iteratoritr=items.iterator();while(itr.hasNext()){FileItemitem=(FileItem)itr.next();if(item.isFormField()){System.out.println("表单参数名:"+item.getFieldName()+"，表单参数值:"+item.getString("UTF-8"));}else{if(item.getName()!=null!item.getName().equals("")){System.out.println("上传文件的大小:"+item.getSize());System.out.println("上传文件的类型:"+item.getContentType());System.out.println("上传文件的名称:"+item.getName());FiletempFile=newFile(item.getName());Filefile=newFile(sc.getRealPath("/")+savePath,tempFile.getName());item.write(file);request.setAttribute("upload.message","上传文件成功！");}else{request.setAttribute("upload.message","没有选择上传文件！");}}}}catch(FileUploadExceptione){e.printStackTrace();}catch(Exceptione){e.printStackTrace();request.setAttribute("upload.message","上传文件失败！");}request.getRequestDispatcher("/uploadResult.jsp").forward(request,response);}

上传图片到服务器如何写代码？

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'/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\'

'\ 建站铺 jzpu.com 2007 7.18 /'

'/ CODE version 4.8 express \'

'\ 请保留信息，以便确认版本区别 /'

'/__________________________________\'

Dim oUpFileStream

Class UpFile_Class

Dim Form, File, Version, Err

Private Sub Class_Initialize

Err = -1

End Sub

Private Sub Class_Terminate

If Err 0 Then

Form.RemoveAll

Set Form = Nothing

File.RemoveAll

Set File = Nothing

oUpFileStream.Close

Set oUpFileStream = Nothing

End If

End Sub

Public Sub GetData(MaxSize)

' --------------------------------------

' 上传组件开关

' 参数：IsOpenUpLoad，1 = 打开，0 = 关闭

Const IsOpenUpLoad = 1

If IsOpenUpLoad 1 Then Exit Sub

' --------------------------------------

Dim RequestBinData, sSpace, bCrLf, sInfo, iInfoStart, iInfoEnd, tStream, iStart, oFileInfo

Dim iFileSize, sFilePath, sFileType, sFormValue, sFileName

Dim iFindStart, iFindEnd

Dim iFormStart, iFormEnd, sFormName

If Request.TotalBytes 1 Then

Err = 1

Exit Sub

End If

If MaxSize 0 Then

If Request.TotalBytes MaxSize Then

Err = 2

'Exit Sub

End If

End If

Set Form = Server.CreateObject("Scripting.Dictionary")

Form.CompareMode = 1

Set File = Server.CreateObject("Scripting.Dictionary")

File.CompareMode = 1

Set tStream = Server.CreateObject("ADODB.Stream")

Set oUpFileStream = Server.CreateObject("ADODB.Stream")

oUpFileStream.Type = 1

oUpFileStream.Mode = 3

oUpFileStream.Open

oUpFileStream.Write Request.BinaryRead(Request.TotalBytes)

oUpFileStream.Position = 0

RequestBinData = oUpFileStream.Read

iFormEnd = oUpFileStream.Size

bCrLf = ChrB(13) ChrB(10)

sSpace = MidB(RequestBinData,1, InStrB(1,RequestBinData,bCrLf)-1)

iStart = LenB(sSpace)

iFormStart = iStart+2

Do

iInfoEnd = InStrB(iFormStart,RequestBinData,bCrLf bCrLf)+3

tStream.Type = 1

tStream.Mode = 3

tStream.Open

oUpFileStream.Position = iFormStart

oUpFileStream.CopyTo tStream,iInfoEnd-iFormStart

tStream.Position = 0

tStream.Type = 2

tStream.CharSet = "utf-8"

sInfo = tStream.ReadText

iFormStart = InStrB(iInfoEnd,RequestBinData,sSpace)-1

iFindStart = InStr(22,sInfo,"name=""",1)+6

iFindEnd = InStr(iFindStart,sInfo,"""",1)

sFormName = Mid(sinfo,iFindStart,iFindEnd-iFindStart)

If InStr(45,sInfo,"filename=""",1) 0 Then

Set oFileInfo = new FileInfo_Class

iFindStart = InStr(iFindEnd,sInfo,"filename=""",1)+10

iFindEnd = InStr(iFindStart,sInfo,"""",1)

sFileName = Mid(sinfo,iFindStart,iFindEnd-iFindStart)

oFileInfo.FileName = Mid(sFileName,InStrRev(sFileName, "\")+1)

oFileInfo.FilePath = Left(sFileName,InStrRev(sFileName, "\"))

oFileInfo.FileExt = Mid(sFileName,InStrRev(sFileName, ".")+1)

iFindStart = InStr(iFindEnd,sInfo,"Content-Type: ",1)+14

iFindEnd = InStr(iFindStart,sInfo,vbCr)

oFileInfo.FileType = Mid(sinfo,iFindStart,iFindEnd-iFindStart)

oFileInfo.FileStart = iInfoEnd

oFileInfo.FileSize = iFormStart -iInfoEnd -2

oFileInfo.FormName = sFormName

file.add sFormName,oFileInfo

else

tStream.Close

tStream.Type = 1

tStream.Mode = 3

tStream.Open

oUpFileStream.Position = iInfoEnd

oUpFileStream.CopyTo tStream,iFormStart-iInfoEnd-2

tStream.Position = 0

tStream.Type = 2

tStream.CharSet = "utf-8"

sFormValue = tStream.ReadText

If Form.Exists(sFormName) Then

Form(sFormName) = Form(sFormName) ", " sFormValue

Else

form.Add sFormName,sFormValue

End If

End If

tStream.Close

iFormStart = iFormStart+iStart+2

Loop Until (iFormStart+2) = iFormEnd

RequestBinData = ""

Set tStream = Nothing

End Sub

End Class

Class FileInfo_Class

Dim FormName, FileName, FilePath, FileSize, FileType, FileStart, FileExt

Public Function SaveToFile(Path)

On Error Resume Next

Dim oFileStream

Set oFileStream = CreateObject("ADODB.Stream")

oFileStream.Type = 1

oFileStream.Mode = 3

oFileStream.Open

oUpFileStream.Position = FileStart

oUpFileStream.CopyTo oFileStream,FileSize

oFileStream.SaveToFile Path,2

oFileStream.Close

Set oFileStream = Nothing

End Function

Public Function FileData

oUpFileStream.Position = FileStart

FileData = oUpFileStream.Read(FileSize)

End Function

End Class

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