Question

我要求网站访问者显示如下：

访客总数
访客当天的总人数。

我已经完成了第一项要求。如何每天实施第二个..？

这里的Servlet代码：

   public class HitCounterServlet extends HttpServlet {

     String fileName = "D://hitcounter.txt";
     long hitCounter;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    readFile();
    updateHitCounterFile();
    HttpSession usersession = request.getSession();
    usersession.setAttribute("HITCOUNTER", hitCounter);
}

private void updateHitCounterFile() throws IOException {

    /**
     * Here I am increasing counter each time this HitCounterServlet is called. 
     * I am updating hitcounter.txt file which store total number of visitors on website.
     * Now I want total number of visitor on per day basis. 
    */

    hitCounter = hitCounter + 1;

    // read and update into file
    File file = new File(fileName);

    // if file doesnt exists, then create it
    if (!file.exists()) {
        file.createNewFile();
    }

    FileWriter fw = new FileWriter(file.getAbsoluteFile());
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write(Long.toString(hitCounter));
    bw.close();
}

public void readFile() {
    BufferedReader br = null;
    String temp = "";
    try {
        br = new BufferedReader(new FileReader(fileName));
        while ((temp = br.readLine()) != null) {
            hitCounter = Long.parseLong(temp);
        }
        System.out.println("HIT Counter : " + hitCounter);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (br != null) {
            try {
                br.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
 }
}

Answer 1

声明一个变量计数器并在JSP中递增它。

当部署JSP并准备好其java文件时，该变量应被视为该java文件中的静态变量。因此，即使您重新加载文件，计数器也会递增。

这仅适用于所有计数器。如果重新部署，则该值将丢失。然后是序列化或数据库选项。

或在web.xml中使用servlet init config参数。我目前没有与JSP联系。它的名字与上面提到的相同。

如何在java和＆amp ;;中每天计算网站hitcounter servlet的..？

1 个答案: