我想用一个文本文件mycount.txt做一个计数器，请给源码！

Question

送你一个
    /**
     * 功能:读取计数器文件
     * @param request
     * JSP内部对象
     * @param config
     * JSP内部对象
     * @return
     * 计数器文件中的数字字符串
     */
    public String getArithmometer(HttpServletRequest request, ServletConfig config)
    {
        String count_str = "1";
        try
        {
            CommFileIO myfile = new CommFileIO();//读文本文件的类
            String path = config.getServletContext().getRealPath(request.getRequestURI());
            File tempfile = new File(path);
            path = tempfile.getParent();
            File file = new File(String.valueOf(String.valueOf(path)).concat("/arithmometer.cut"));
            if(!file.exists())
            {
                file.createNewFile();
                count_str = "1";
            } else
            {
                myfile.init(String.valueOf(String.valueOf(path)).concat("/arithmometer.cut"));
                int filecount = myfile.getReadFileRowCount();
                if(filecount == 0)
                    count_str = "1";
                else
                    count_str = myfile.getReadFileLineValue(1);
            }
        }
        catch(Exception exception) { }
        if(count_str == null || count_str.trim().equals(""))
            count_str = "1";
        return count_str;
    }
    /**
     * 功能:设置计数器的值
     * @param request
     * JSP内部对象
     * @param config
     * JSP内部对象
     * @param count
     * 写入计数器的值
     */
    public void setArithmometer(HttpServletRequest request, ServletConfig config, int count)
    {
        try
        {
            String client_ip = request.getRemoteAddr();
            HttpSession session = request.getSession();
            String old_client_ip = (String)session.getAttribute("Arithmometer_client_ip");
            if(old_client_ip == null || client_ip == null || !client_ip.trim().equals(old_client_ip.trim()))
            {
                session.setAttribute("Arithmometer_client_ip", client_ip.trim());
                String path = config.getServletContext().getRealPath(request.getRequestURI());
                File tempfile = new File(path);
                path = tempfile.getParent();
                File file = new File(String.valueOf(String.valueOf(path)).concat("/arithmometer.cut"));
                if(!file.exists())
                    file.createNewFile();
                FileWriter fw = new FileWriter(String.valueOf(String.valueOf(path)).concat("/arithmometer.cut"), false);
                PrintWriter pw = new PrintWriter(fw);
                pw.println(count);
                pw.flush();
                pw.close();
                fw.close();
            }
        }
        catch(Exception exception) { }
    }
    /**
     * 功能:取得计数器的值,并使计数器值加一
     * @param request
     * JSP内部对象
     * @param config
     * JSP内部对象
     * @return
     * 计数器值字符串
     */
    public String getArithmometerNumber(HttpServletRequest request, ServletConfig config)
    {
        String count_str = getArithmometer(request, config);
        count_str = count_str.trim();
        try
        {
            int count = (new Integer(count_str)).intValue();
            setArithmometer(request, config, count + 1);
        }
        catch(Exception exception) { }
        return count_str;
    }