The client sends in a request
string. The server reads the request and sends a response based on the request string. Im pasting part of the client and server code. The client code is the method that sends the request to the server(some of the variables may not be defined in this method since they are class variables). The server code is the doPost method of the servlet.
CLIENT
private void doSend(String request,
HttpPosterListener listener)
{
HttpConnection conn = null;
InputStream in = null;
OutputStream out = null;
String responseStr = null;
String errorStr = null;
boolean wasError = false;
try
{
conn = (HttpConnection)Connector.open(url);
}
catch (IOException e)
{
wasError = true;
errorStr = "1."+e.getMessage();
}
try
{
// Set the request method and headers
conn.setRequestMethod(HttpConnection.POST);
conn.setRequestProperty("User-Agent",
"Profile/MIDP-1.0 Configuration/CLDC-1.0 ReverseClient");
conn.setRequestProperty("Content-Language", "en-US");
}
catch (IOException e)
{
wasError = true;
errorStr = "1."+e.getMessage();
}
try
{
// Getting the output stream may flush the headers
out = conn.openOutputStream();
int requestLength = request.length();
for (int i = 0; i < requestLength; ++i)<br /> {<br /> out.write(request.charAt(i));<br /> }<br /> }<br /> catch (IOException e)<br /> {<br /> wasError = true;<br /> errorStr = "2."+e.getMessage();<br /> } <br /> // Opening the InputStream will open the connection<br /> // and read the HTTP headers. They are stored until<br /> // requested.<br /> try<br /> {<br /> in = conn.openInputStream();<br /> if (in == null)<br /> System.out.println("NULL INPUT STREAM");<br /> }<br /> catch (Exception e)<br /> {<br /> wasError = true;<br /> errorStr = "3a."+e.getMessage();<br /> }<br /> try<br /> {<br /> // Get the length and process the data<br /> StringBuffer responseBuf;<br /> long length = conn.getLength();<br /> if (length > 0)
{
responseBuf = new StringBuffer(/*(int)length*/);
}
else
{
responseBuf = new StringBuffer(); // default length
}
int ch;
while ((ch = in.read()) != -1) // THIS IS WHERE THE PROBLEM IS I THINK
{
responseBuf.append((char)ch);
System.out.println("responseBuf="+responseBuf);
}
responseStr = responseBuf.toString();
System.out.println("responseStr="+responseStr);
// support URL rewriting for session handling
String rewrittenUrl = conn.getHeaderField("X-RewrittenURL");
if (rewrittenUrl != null)
{
url = rewrittenUrl; // use this new one in future
}
}
catch (NullPointerException npe) // I CATCH THE EXCEPTION HERE
{
wasError = true;
System.out.println("nulling"+npe.getMessage());
errorStr = "nulling"+npe.getMessage();
}
catch (Exception e)
{
wasError = true;
errorStr = "3b."+e.getMessage();
}
finally
{
if (in != null)
{
try
{
in.close();
}
catch (IOException e)
{
}
}
if (out != null)
{
try
{
out.close();
}
catch (IOException e)
{
}
}
if (conn != null)
{
try
{
conn.close();
}
catch (IOException e)
{
}
}
}
if (wasError)
{
listener.handleHttpError(errorStr);
}
else
{
listener.receiveHttpResponse(responseStr);
}
}
SERVER
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
try
{
// read request
InputStream in = request.getInputStream();
int requestLength = request.getContentLength();
if (requestLength == -1)
{
throw new IOException("Need to know request length");
}
StringBuffer buf = new StringBuffer(requestLength);
for (int i = 0; i < requestLength; ++i)
{
int ch = in.read();
if (ch == -1)
{
break;
}
buf.append((char)ch);
}
in.close();
String requestStr = buf.toString();
// process request, producing response
String responseStr;
if (requestStr.equals("TicketList"))
responseStr = "Praveen's concert\\VPR's concert";
else if (requestStr.equals("TicketTypeList"))
responseStr = "300 SEK\\500 SEK";
else if (requestStr.equals("ConfirmTicket"))
responseStr = "THE TICKET";
else
responseStr = "300 SEK\\500SEK"; // makes sure i always send a response string
// write response
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
out.write(responseStr);
out.close();
}
catch (IOException e)
{
e.printStackTrace();
throw e;
}
catch (Exception e)
{
e.printStackTrace();
throw new ServletException(e.getMessage());
}
}
Well thats the code. any help will be really appreciated. Thanks
Praveen.
