public static int getBytePosition(int rowNumber,String filePath){
            BufferedReader bufReader = null;
            String lineStr = "";
            StringBuffer nContent = null;
            int byteLength = 0;

            try {
                String lineSeparator = retrieveLineSeparator(new
 
 File(filePath));
                bufReader = new BufferedReader(new FileReader(org.apache.camel.util.FileUtil.normalizePath(filePath)));
                nContent = new StringBuffer();
                for (int i = 0; i < rowNumber; i++) {
                    if((lineStr = bufReader.readLine()) != null
 
){
                        nContent.append(lineStr);
                        if(StringUtil.isNotNullOrNotEmptryString(lineSeparator) && lineSeparator.equals("\n")){
                            byteLength  = nContent.toString().getBytes().length+(rowNumber-1);
                        } else {
                            byteLength  = nContent.toString().getBytes().length+(2
 
*rowNumber-2);
                        }

                    }
                }               
            } catch (Exception e) {
                log.error("[RatingEngine] error occurred: ERROR ", e);
            }finally{
                //Closing stream                 
                try {
                    if(bufReader != null){  
                        bufReader.close();     
                    }
                } catch (IOException e) {
                    log.error("[RatingEngine] error occurred: ERROR ", e);
                }

            }
            return byteLength;

        }
      //add for check Line Separator
      public static String retrieveLineSeparator(File file) throws IOException {
            char current;
            String lineSeparator = "";
            FileInputStream fis = new FileInputStream(file);
            try {
                while (fis.available() > 0) {
                    current = (char) fis.read();
                    if ((current == '\n') || (current == '\r')) {
                        lineSeparator += current;
                        if (fis.available() > 0) {
                            char next = (char) fis.read();
                            if ((next != current)
                                    && ((next == '\r') || (next == '\n'))) {
                                lineSeparator += next;
                            }
                        }
                        return lineSeparator;
                    }
                }
            } finally {
                if (fis!=null) {
                    fis.close();
                }
            }
            return null;
        }



    /* 
     * Insert contents to the specified location  
     * @param fileName File path+File name
     * @param pos Insert position 【the first row is 0】 
     * @param insertContent  Data that needs to be inserted 
     */  
    public static void appendContents(String filename,int pos,String insertContent){ 
        File tmp = null;
        RandomAccessFile raf = null;
        BufferedOutputStream tmpOut = null;
        BufferedInputStream tmpIn = null;
        byte[] buf;
        try {
            tmp = File.createTempFile("tmp", null);  
            raf = new RandomAccessFile(org.apache.camel.util.FileUtil.normalizePath(filename), "rw");  
            tmpOut = new BufferedOutputStream(new FileOutputStream(tmp));  
            tmpIn = new BufferedInputStream(new FileInputStream(tmp));  
            System.out.println(raf.length());  
            raf.seek(pos);
            buf = new byte[64];  
            int hasRead;  
            //System.out.println(raf.read(buf));  
            while((hasRead = raf.read(buf))>0){  
                //Reading and putting the original contents into temporary files 
                tmpOut.write(buf, 0, hasRead);  
            }  
            tmpOut.flush();  
            raf.seek(pos);  
            raf.write(insertContent.getBytes());  
            //Additional temporary file contents
            while((hasRead = tmpIn.read(buf))>0){  
                raf.write(buf,0,hasRead);  
            }  
        } catch (Exception e) {
            log.error("[RatingEngine] error occurred: ERROR ", e);
        }finally{
            //Closing stream                 
            try {
                if(tmpIn != null){  
                    tmpIn.close();     
                }
                if (tmpOut!=null) {
                    tmpOut.close(); 
                }
                if (raf!=null) {
                    raf.close();
                }
                //Deleting temporary files
                if (tmp!=null&&tmp.exists()) {
                    tmp.deleteOnExit();
                }
            } catch (IOException e) {
                log.error("[RatingEngine] error occurred: ERROR ", e);
            }
        }  
    }