Java 在前端打印servlet变量后，如何擦除这些变量

如何擦除前端显示的servlet变量中的数据

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws 

ServletException, IOException {
    // TODO Auto-generated method stub

    PrintWriter out = response.getWriter();
    String baseUrl = request.getParameter("url");
    String pageValue = request.getParameter("pageValue");
    out.println("Url ="+baseUrl+pageValue);


    JSONObject obj = new JSONObject();
    while(true)
        {
            temp = baseUrl + i;
            System.out.println(temp);
            out.println(temp);
            if(DataFunnel(temp).equals(""))
                {   
                    System.out.println("No More pages to crawl");
                    System.out.println("Stop Page Link = "+temp);
                    System.out.println("byeeeeeeeeeeeeee");
                    break;
                }
            i=i+10;
        }


    try {

        obj.put("Review-Title",  titleList);

        System.out.println(obj.get("Review-Date"));
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }





    out.println(obj);


    out.close();

}

在下面的代码中，数据是obj在多个调用中追加的，如何在打印到前端后清除obj或out

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws 

ServletException, IOException {
    // TODO Auto-generated method stub

    PrintWriter out = response.getWriter();
    String baseUrl = request.getParameter("url");
    String pageValue = request.getParameter("pageValue");
    out.println("Url ="+baseUrl+pageValue);


    JSONObject obj = new JSONObject();
    while(true)
        {
            temp = baseUrl + i;
            System.out.println(temp);
            out.println(temp);
            if(DataFunnel(temp).equals(""))
                {   
                    System.out.println("No More pages to crawl");
                    System.out.println("Stop Page Link = "+temp);
                    System.out.println("byeeeeeeeeeeeeee");
                    break;
                }
            i=i+10;
        }


    try {

        obj.put("Review-Title",  titleList);

        System.out.println(obj.get("Review-Date"));
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }





    out.println(obj);


    out.close();

}

---

您不需要“清除”servlet输出流。 servlet容器将在servlet完成后关闭流。 您也不需要清除obj，这将在doPost完成后由垃圾收集器进行