Solved

writing to a file every 1 Minute!!

Posted on 2004-09-15
7
205 Views
Last Modified: 2010-03-31
how can i solve the problem in java: java-program that write to file every 1 minute?? can u please help?? please submit a sample code if u can??


 
 

0
Comment
Question by:aimueller
7 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063373
Use java.util.Timer
0
 
LVL 21

Expert Comment

by:MogalManic
ID: 12063644
More specificaly:

MyTimerTask task=new MyTimerTask();
Timer t=new Timer();
t.schedule(task, startTime, 1000*60) ;
...

Class MyTimerTask extends TimerTask
{
  public void run()
  {
...Scheduled activity...
  }
}


The java.util.Timer class is new to JDK 1.4.  If you are using an older JDK you will have to write something using Threads.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12063662
>>The java.util.Timer class is new to JDK 1.4.  

1.3 actually
0
Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

 
LVL 37

Expert Comment

by:zzynx
ID: 12064016
>> please submit a sample code if u can

This appends a line of text in the file log.txt at directory C:\dir1\dir2 every minute:

/*
 * TimerDemo.java
 *
 */

import java.util.*;
import java.io.*;

/**
 *
 * @author  zzynx
 */
public class TimerDemo {
   
    public TimerDemo() {
        new Timer().schedule(new TimerTask() {
            public void run() {
                File f = new File("c:/dir1/dir2/log.txt");
                try {
                    FileWriter writer = new FileWriter(f, true);
                    writer.write(new Date().toString() + " Another line written");
                    writer.write(10);
                    writer.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }, new Date(), 1000*60);
    }
   
    public static void main (String args[]) {
        new TimerDemo();
    }
}

The file looks like:

Wed Sep 15 14:57:34 CEST 2004 Another line written
Wed Sep 15 14:58:34 CEST 2004 Another line written
Wed Sep 15 14:59:34 CEST 2004 Another line written
Wed Sep 15 15:00:34 CEST 2004 Another line written
Wed Sep 15 15:01:34 CEST 2004 Another line written
Wed Sep 15 15:02:34 CEST 2004 Another line written
0
 

Author Comment

by:aimueller
ID: 12072515
thank u zzynx. In this case the file "log.txt" is opened and closed every minute. can u change the code, that the run() method work on a filestream (writer) may be as global variable??

thank u

andy
0
 
LVL 37

Accepted Solution

by:
zzynx earned 50 total points
ID: 12072561
Like this?

/*
 * TimerDemo.java
 *
 */

import java.util.*;
import java.io.*;
/**
 *
 * @author  zzynx
 */
public class TimerDemo {
   
    private FileWriter writer = null;
   
    public TimerDemo() {
        File f = new File("c:/gd/swap/log.txt");
        try {
            writer = new FileWriter(f, true);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
       
        new Timer().schedule(new TimerTask() {
            public void run() {
                try {
                    writer.write(new Date().toString() + " Another line written");
                    writer.write(10);
                    writer.flush();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }, new Date(), 1000*15);
    }
   
    public static void main (String args[]) {
        new TimerDemo();
    }
}
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12074135
Thanks for accepting.

PS. For my future comments: can you explain me what you've wanted more to award me with an A-grade?
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Java Jpanels and Jframe 8 33
tomcat not starting 6 45
hibernate jars 4 32
How to convert from xls to xlsx using java 7 40
Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question