FileUploadUML

DeferredFileOutputStream

[iter.hasNext()]

Loop

item.openStream()

Streams

类

+ threshold:int= defaultValue+ written:long

iter=getItemIterator(ctx);

DiskFileItem

+ repository:File= defaultValue+ dfos:DeferredFileOutputStream+ tempFile:File+fieldName:String+isFormField:boolean

+getOutputStream()

FileUploadBase

new DiskFileItem()

FileItemIterator

FileItem fileItem = fac.createItem()

getStream()=currentOutputStream

checkThreshold(len)

parseRequest(RequestContext ctx)

ByteArrayOutputStream

ThresholdingOutputStream

ServletFileUpload

fileItem.getOutputStream()

OutputStream

thresholdReached()

new DeferredFileOutputStream()

DiskFileItemFactory

fac=getFileItemFactory()

FileItem

+ memoryOutputStream:ByteArrayOutputStream= defaultValue+ currentOutputStream:OutputStream+ outputFile:File+closed:boolean=false