If you are sending binary data--say because you user is downloading a file, or your servlet is writing a image--you need to open a javax.servlet.ServletOutputStream ( http://download.oracle.com/javaee/6/api/javax/servlet/ServletOutputStream.html ).
On Fri, Jul 15, 2011 at 11:23 AM, Paritosh Patel <xygnu...@gmail.com> wrote: > I apologize in advance if this is not the correct mail list for such a > question, but this is the closest one I could find. > > (I am using Tomcat 6.0.26 but my question is generic in nature) > > I have a Java client that talks to a servlet using several text fields. I > now wanted to add a field that includes binary data (in this case a protocol > buffer byte array). The data gets to the servlet, but the bytes are changed. > Specifically, it appears that the encoding/decoding of bytes > 127 are not > the same as the original bytes. > > The client specified content-type to be "application/x-www-form-urlencoded" > right now, but I have tried several others. Then, for encoding, I have tried > encoding the bytes using URLEncoder > > ByteArrayOutputStream osBytes = new ByteArrayOutputStream(); > byte[] val = "..." // My binary data > String valStr = new String((byte[]) val); > osBytes.write(URLEncoder.encode(valStr, "UTF-8").getBytes()); > > DataOutputStream os = new > DataOutputStream(urlConn.getOutputStream()); > os.write(osBytes.toByteArray()); > > Now, on the servlet side, I do a request.getParameter() to get the field. > It is already decoded (I assume URL decoding) by the servlet container. Do I > have control over the decoding? > > A portion of the byte array at the client is as follows... > 31 12 e 8 ac e2 cb 8c 90 26 10 90 > > There are several variables, that I need to get right at the same time. > 1) content-type... what is the correct content type > 2) encoder... is URLEncoder the correct encoder? > 3) encode string... UTF-8 and US-ASCII do not work. > 4) do I have control over the decoding on the servlet side? > 5) anything else I need to worry about? > > Any help would be greatly appreciated. > > - Tosh > > -- "Hell hath no limits, nor is circumscrib'd In one self-place; but where we are is hell, And where hell is, there must we ever be" --Christopher Marlowe, *Doctor Faustus* (v, 121-24)
