Greetings,
I'm running Tomcat with Apache and I have a problem of "missing bytes".
Let me explain. My applet needs to send binary data to a servlet. It
appears that if I send more than about 1k bytes at once Tomcat throws an
exception. I need to get the applet-servlet communications ASAP, so i
decided to send the data in 1k chunks before trying to trace why the
exception is thrown. As is seen in the code below I'm setting the
Content-Length header in the applet to 1024 but when in the servlet I
check that header it is few bytes short. Can someone explain why?
Applet
------
// data in byte array called "data" is compressed
ByteArrayOutputStream baos = new ByteArrayOutputStream(BUFFSZ);
GZIPOutputStream gos = new GZIPOutputStream(baos);
gos.write(data, 0, data.length);
gos.finish();
byte[] zip = baos.toByteArray();
showStatus("ZIP size: " + zip.length);
url = new URL(...);
int from = 0;
int to = 0;
byte[] buffer = new byte[BUFFSZ];
while (from < zip.length) {
to = Math.min(zip.length, to+BUFFSZ);
System.arraycopy(zip, from, buffer, 0, to-from);
send(buffer);
from = to;
}
.......
private void send(byte[] b) {
try {
URLConnection con = url.openConnection();
con.setUseCaches(false);
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestProperty("Content-Type",
"application/octet-stream");
con.setRequestProperty("Content-Length",
String.valueOf(b.length));
con.getOutputStream().write(b);
con.getOutputStream().flush();
BufferedReader in = new BufferedReader(new
InputStreamReader(connection.getInputStream()));
String s;
while ((s = in.readLine()) != null)
System.out.println(s);
} catch (IOException e) {
e.printStackTrace();
}
..........
Servlet
-------
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
if
(req.getHeader("Content-Type").equals("application/octet-stream")) {
try {
ServletInputStream sis = req.getInputStream();
int n =
Integer.parseInt(req.getHeader("Content-Length"));
FileOutputStream fos = new FileOutputStream(fn, true);
out.println("Received content-length: " + i);
byte[] buffer = new byte[n];
int sent = 0;
while ((n = sis.readLine(buffer, 0, n)) != -1){
fos.write(buffer, 0, n);
sent += n;
}
out.println("Received " + sent + " bytes");
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace(out);
}
......
I have also tried reading a one character at a time from BufferedReader
seems to hang(!)
BufferedReader br = req.getBufferedReader();
for (i = 0; i < Integer/parseInt(req.getHeader("Content-Length"));
i++)
int b = (int) br.read()
I also tried reading Content-Length bytes from ServletInputStream but
that also doesn't work using SertvletInputStream.readLine(buffer, 0,
contlen) but that always reads less that Content-Length.
So, how does one do it with servlets? TIA,
--
Aaron Stromas | "Tick-tick-tick!!!... ja, Pantani is weg..."
Oracle Corp | BRTN commentator
+1 703.708.68.21 | L'Alpe d'Huez
1995 Tour de France
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