Write file in servlet

Question

Hi all,
I am developing an application but there is a error in my code i culdnt find so far. Can anyone help?
I want to write to a .xml file in web server with servlet from remote. My code is
private static String message = "Error during Servlet processing";
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
//        response.setContentType("text/html;charset=UTF-8");
        try {
            int len = request.getContentLength();
            byte[] input = new byte[len];
            ServletInputStream sin = request.getInputStream();
            int c, count = 0;
            while ((c = sin.read(input, count, input.length - count)) != -1) {
                count += c;
            sin.close();
            String inString = new String(input);
            int index = inString.indexOf("/n");
            if (index == -1) {
                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
                response.getWriter().print(message);
                response.getWriter().close();
                return;
            String user = inString.substring(0, index);
            String data = inString.substring(index + 2);
            //decode application/x-www-form-urlencoded string
//            String decodedUser = URLDecoder.decode(user, "UTF-8");
//            String decodedData = URLDecoder.decode(data, "UTF-8");
//            int i = decodedData.indexOf("/n");
//            String user = decodedData.substring(0, i);
//            String db = decodedData.substring(i + 2, decodedData.length());
            String result = "no";
//            response.setContentType("text/html");
            String filename = "/WEB-INF/" + user + ".xml";
//            String pathName = getServletContext (  ) .getRealPath ( "/" + filename ) ;
//            String contentType = getServletContext (  ) .getMimeType ( pathName ) ;
//            if  ( contentType != null ) 
//                response.setContentType ( contentType ) ;
//            else
//                response.setContentType ( "application/octet-stream" ) ;
            try {
                OutputStream fcheck = null;
                byte[] buf = data.getBytes();
                fcheck = new FileOutputStream(filename);
                for (int i = 0; i < buf.length; i++) {
                    fcheck.write(buf);
result = "yes";
} catch (IOException ex) {
Logger.getLogger(UpdateDB.class.getName()).log(Level.SEVERE, null, ex);
result = "no";
// ServletContext context = getServletContext();
// set the response code and write the response data
response.setStatus(HttpServletResponse.SC_OK);
OutputStreamWriter writer = new OutputStreamWriter(response.getOutputStream());
writer.write(result);
writer.flush();
writer.close();
} catch (IOException e) {
try {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
response.getWriter().print(e.getMessage());
response.getWriter().close();
} catch (IOException ioe) {
ý am sending data from remote as a string and want to write it in xml. But it is not working. Where am i wrong?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

I fixed it. But now it doesnt write to file and there is no error. So i cant find where am a wrong.
I send a request, it is taking string but it is not writing to file eventhough it is entering the try block.
Why it isnt writing? Is not servlet let it to write to file. My working code is here
private static String message = "Error during Servlet processing";
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try {
            int len = request.getContentLength();
            byte[] input = new byte[len];
            ServletInputStream sin = request.getInputStream();
            int c, count = 0;
            while ((c = sin.read(input, count, input.length - count)) != -1) {
                count += c;
            sin.close();
            String inString = new String(input);
            int index = inString.indexOf("/n");
            if (index == -1) {
                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
                response.getWriter().print(message);
                response.getWriter().close();
                return;
            String user = inString.substring(0, index);
            String data = inString.substring(index + 2);
            //decode application/x-www-form-urlencoded string
//            String decodedUser = URLDecoder.decode(user, "UTF-8");
            String decodedData = URLDecoder.decode(data, "UTF-8");
//            int i = decodedData.indexOf("/n");
//            String user = decodedData.substring(0, i);
//            String db = decodedData.substring(i + 2, decodedData.length());
            String result = "no";
            String filename = user + ".xml";
            try {
                OutputStream fcheck = null;
                byte[] buf = decodedData.getBytes();
                fcheck = new FileOutputStream(filename);
                for (int i = 0; i < buf.length; i++) {
                    fcheck.write(buf);
// char buffer[]=new char[data.length()];
// data.getChars(0, data.length(), buffer, 0);
// FileWriter f0=new FileWriter(filename);
// for(int i=0;i<buffer.length;i++){
// f0.write(buffer[i]);
result = "yes";
} catch (IOException ex) {
Logger.getLogger(UpdateDB.class.getName()).log(Level.SEVERE, null, ex);
result = "no";
// ServletContext context = getServletContext();
// set the response code and write the response data
response.setStatus(HttpServletResponse.SC_OK);
OutputStreamWriter writer = new OutputStreamWriter(response.getOutputStream());
writer.write(result);
writer.flush();
writer.close();
} catch (IOException e) {
try {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
response.getWriter().print(e.getMessage());
response.getWriter().close();
} catch (IOException ioe) {