OutOfMemoryError(When upload a big file)?

HI , everyone:

when i wrote a client to upload a big file use HTTP1.1 by java,i got a OutOfMemoryError,who can help me , i have two questions:

1、After wrote to OutPutStream,i flush the stream,but Why did i got a OutOfMemoryError?Who consume my Memory?

2、I can increase heap size ,but when upload a much bigger file ,it cannot woke fine.How can i reslove it?

THX

[424 byte] By [bluebangbang] at [2007-12-24]