getting binary data from HTTP Request

[Shlomi]

Hi.

i have a servlet that receives a binary data in one of its parameters.
i cannot read this binary data to a byte array for some reason
when i am trying to use servletInputStream.available() i am getting 0.
any suggestions ?
what am i donig wrong ?

here is my code :
(don't look for syntax mistakes, i pasted the relevant code only)

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
throws ServletException, IOException
{
try
{
// get POSTED data
// use servlet input stream
ServletInputStream ins = request.getInputStream();
//count length of data
int len = request.getContentLength();
//allocate bytes buffer
byte[] buf = new byte[len];
int offset = 0;
do
{
int inputLen = ins.read(buf, offset, len - offset);
// MY PROBLEM ----- inputLen always equals -1
if (DEBUG)
System.out.println("POST Input Length = " + inputLen);

if (inputLen <= 0)
{
String msg = "read finished early - read " +
offset + " of " + len + " bytes(contentLength)" ;
throw new IOException(msg);
}
offset += inputLen;
}
}

 

[Michiel Konstapel]

Hi.

i have a servlet that receives a binary data in one of its parameters.
i cannot read this binary data to a byte array for some reason when i am
trying to use servletInputStream.available() i am getting 0. any
suggestions ? what am i donig wrong ?

Don't use available(), just read. available() only tells you how much can
*certainly* be read without blocking, so returning 0 all the time is in
fact a valid implementation. read() will block until some data has been
read; just continue until it returns -1 (end of stream).
However, I see you're actually doing that in the posted code, and I don't
know why that isn't working :-/
Michiel

here is my code : (don't look for syntax mistakes, i pasted the relevant
code only)

public void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
throws ServletException, IOException
{
try
{
// get POSTED data
// use servlet input stream
ServletInputStream ins = request.getInputStream();
//count length of data
int len = request.getContentLength();
//allocate bytes buffer byte[] buf = new byte[len];
int offset = 0;
do
{
int inputLen = ins.read(buf, offset, len - offset);
// MY PROBLEM ----- inputLen always equals -1 if (DEBUG)
System.out.println("POST Input Length = " + inputLen);

if (inputLen <= 0)
{
String msg = "read finished early - read " +
offset + " of " + len + " bytes(contentLength)" ;
throw new IOException(msg);
}
offset += inputLen;
}
}

 

[Igor N. Kolomiyets]

Hi,

how binary data is being passed to the servlet? What is tha value in len
variable (getContentLength())?

Best regards,
Igor.

 

[Shlomi]

Hi,

how binary data is being passed to the servlet? What is tha value in len
variable (getContentLength())?

The len of the variable is somewhere between 300 - 350 bytes.
i am integrating two programs that work on the web, i have another
application that pass the binary data to my servlet.

Thank you so much for your help !
Shlomi

Best regards,
Igor.

Hi.

i have a servlet that receives a binary data in one of its parameters.
i cannot read this binary data to a byte array for some reason
when i am trying to use servletInputStream.available() i am getting 0.
any suggestions ?
what am i donig wrong ?

here is my code :
(don't look for syntax mistakes, i pasted the relevant code only)

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
throws ServletException, IOException
{
try
{
// get POSTED data
// use servlet input stream
ServletInputStream ins = request.getInputStream();
//count length of data
int len = request.getContentLength();
//allocate bytes buffer
byte[] buf = new byte[len];
int offset = 0;
do
{
int inputLen = ins.read(buf, offset, len - offset);
// MY PROBLEM ----- inputLen always equals -1
if (DEBUG)
System.out.println("POST Input Length = " + inputLen);

if (inputLen <= 0)
{
String msg = "read finished early - read " +
offset + " of " + len + " bytes(contentLength)" ;
throw new IOException(msg);
}
offset += inputLen;
}
}

 

[Igor N. Kolomiyets]

Shlomi,

my question was actually what format is your another application sending
data to your servlet? Can you post a sample of the POST request?

Best regards,
Igor.

Hi,

how binary data is being passed to the servlet? What is tha value in len
variable (getContentLength())?

The len of the variable is somewhere between 300 - 350 bytes.
i am integrating two programs that work on the web, i have another
application that pass the binary data to my servlet.

Thank you so much for your help !
Shlomi

Best regards,
Igor.

Hi.

i have a servlet that receives a binary data in one of its parameters.
i cannot read this binary data to a byte array for some reason
when i am trying to use servletInputStream.available() i am getting 0.
any suggestions ?
what am i donig wrong ?

here is my code :
(don't look for syntax mistakes, i pasted the relevant code only)

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
throws ServletException, IOException
{
try
{
// get POSTED data
// use servlet input stream
ServletInputStream ins = request.getInputStream();
//count length of data
int len = request.getContentLength();
//allocate bytes buffer
byte[] buf = new byte[len];
int offset = 0;
do
{
int inputLen = ins.read(buf, offset, len - offset);
// MY PROBLEM ----- inputLen always equals -1
if (DEBUG)
System.out.println("POST Input Length = " + inputLen);

if (inputLen <= 0)
{
String msg = "read finished early - read " +
offset + " of " + len + " bytes(contentLength)" ;
throw new IOException(msg);
}
offset += inputLen;
}
}