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Thread: displaying dyanamic data on jsp while core engine is writing it on text file

  1. #1
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    Default displaying dyanamic data on jsp while core engine is writing it on text file

    hi i am trying to print data on jsp page in realtime scenario while another core engine is writing data into the file
    this is the jsp script let code code


    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <%@ page import="java.io.*"%>
    <%@ page import="java.util.*"%>
    <%@ page import="java.io.BufferedReader"%> 
    <%@ page import="java.io.FileNotFoundException"%> 
    <%@ page import="java.io.FileReader"%> 
    <%@ page import="java.io.IOException"%> 
    <%@ page import="java.util.ArrayList"%> 
    <%@ page import="java.util.List"%>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Reading File from a Location</title>
    </head>
    <body>
    <form >
     
     
    <%
    List<String> list=new ArrayList<String>();
     
     
    BufferedReader bufferedReader = null;
     
    try {
    String filename= "d:/test.txt";
    //Construct the BufferedReader object
    bufferedReader = new BufferedReader(new FileReader(filename));
     
    String line = null;
     
    while ((line = bufferedReader.readLine()) != null) {
    //Process the data, here we just print it out
     
    try {
    Thread.sleep(3000);//sleep for 1000 ms
    response.flushBuffer();
    System.out.println(line);
    out.println("\n" +line+ "\n");
    list.add(line);
    System.out.println(list);
    //out.println(list);
    list.clear();
     
    } catch (InterruptedException e) {
    // TODO Auto-generated catch block
     
    e.printStackTrace();
    }
     
    }
     
    } catch (FileNotFoundException ex) {
    ex.printStackTrace();
    } catch (IOException ex) {
    ex.printStackTrace();
    } finally {
    //Close the BufferedReader
    try {
    if (bufferedReader != null)
    bufferedReader.close();
    } catch (IOException ex) {
    ex.printStackTrace();
    }
    }
     
    %>
     
     
     
     
     
    </form>
     
     
     
    </body>
    </html>

    this d:/test.text basically is written from core engine after every stipulated time lets say every 3 secs
    while the file is written , this test.txt, i am not able to show the data are written simultaneously in real time scenario, im able to show it after the file is wriiten..

    please advise me, how to show the data on jsp in real time simultaneously when in the back hand , core engine is writing the data simultaneously


  2. #2
    Administrator copeg's Avatar
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    Default Re: displaying dyanamic data on jsp while core engine is writing it on text file

    If you want to update a webpage dynamically - since the page is client side and jsp is server side - you will need to set up some sort of communication, typically through AJAX, which uses javascript to query a servlet/page and update the client side as needed.

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    Default Re: displaying dyanamic data on jsp while core engine is writing it on text file

    can u please provide me with some examples ..in this regard...as im new to ajax. i want to know how do we do it using ajax

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    Default Re: displaying dyanamic data on jsp while core engine is writing it on text file


  5. #5
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    Default Re: displaying dyanamic data on jsp while core engine is writing it on text file

    PLease provide me with a working code...so that i can work directly on it.I am in real need for it

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    Default Re: displaying dyanamic data on jsp while core engine is writing it on text file

    Did you take my advice and do a web search? There are thousands of code snippets, tutorials, and explanations all over the internet. We are not a code service and don't get paid to do this, but we are here to help you along the way...help which shouldn't take the place of making an effort to learn how to accomplish your task.

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