change « Operation « Java I/O Q&A





1. How to rename a file name without change its type?    stackoverflow.com

I have doubt in renaming java files... My application has to rename the incoming file which is mdb,dbf,xls,xml,etc. format. I used the following source code. eg:

String filename = "D:/sample.mdb";
File filediriden = new ...

2. Java detect changes in filesystem    stackoverflow.com

I have a folder in which continuously new files are being dumped.In Java,what is the best way to detect changes in file-system (ie. a specified folder in which the files are ...

3. Changing java file    stackoverflow.com

Can I change a java file, when I'm running it on JVM, using this file? For example: I run abc.java. In this program I've a textarea and I want to paste ...

4. Rapidly changing Configuration/Status File? JAVA    stackoverflow.com

I need some way to store a configuration/status file that needs to be changed rapidly. The status of each key value pair (key-value) is stored in that file. The status needs ...

5. FileLock changes between java 5 and java 6    stackoverflow.com

In Java 1.5, java.nio.channels.FileLock did not check to see files that were already locked. Referenced Here The snippet states:

The java.nio.channels.FileLock class checks for files ...

6. Why File.renameTo doesn't change where File points to?    stackoverflow.com

File oldFile = new File("old");
if (oldFile.renameTo(new File("new"))){
    System.out.println(oldFile.getName());//this prints "old"
}
I've looked at openJDK source, and there renameTo(File dest) function looks like this:
public class File implements Serializable, Comparable<File> {
 ...

7. how to change files titles with java    stackoverflow.com

i would like to ask if it is possible with a java prog to give a specific path to a folder "Folder1" and then rename all the files in it, changing ...

8. Change the file descriptor offset    stackoverflow.com

Now I'm making a little program in Java which must read a really big file. Due to this thing, I want to access to the file but not read completely each ...

9. File Changes    coderanch.com

Right now in the API's this is the Exception that gets thrown if the file does not exist, or for any reason you can not write to it. Locked, Read Only permissions on the file. If you want, you can in your catch determine what the cause of the exception is. If you want more information, you'll have to create your ...





10. How to identify the changes in a file?    coderanch.com

11. Change file extension (Very urgent)    coderanch.com

Oh yes - if you just recently wrote the file in your program, did you make sure that you closed the FileOutputStream (or whatever you used to write the file)? It's easy to be careless with these - if you forget to close a file, the garbage collector will usually end up closing it for you (eventually), so you often don't ...

12. Listening to changes in a file    coderanch.com

Hi I am trying to solve a problem that needs me to display server logs to client developer using an applet. I've written a logserver that reads the logfile and spits the output to the socket where my applet is constantly listening. The problem I am facing is I don't know how to tell the logserver that there is new stuff ...

13. Change '/' in filename    coderanch.com

Hey Javaranchers I have a problem with my filename when creating a new BufferedWriter. Please view the following codesnippet: String fileName = "c:/temp//LEMVIGBANEN, VEMB-LEMVIG-THYBORN JERNBANE A/S_20030402_1.XML"; Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName),"ISO-8859-1")); In the filename which is "LEMVIGBANEN, VEMB-LEMVIG-THYBORN JERNBANE A/S_20030402_1.XML" there is a '/' which I want the application to ignore as a part of the file path. This ...

14. how to accept a binarydata in net abd change it to string    coderanch.com

below is my code //client import java.net.*; import java.io.*; public class Client{ public static void main(String args[])throws IOException{ Socket s=new Socket("127.0.0.1",1234); OutputStream os=s.getOutputStream(); PrintStream out=new PrintStream(os); out.println("hello"); } } import java.net.*; import java.io.*; public class server{ public static void main(String args[])throws IOException{ ServerSocket s=new ServerSocket(1234); Socket ss=s.accept(); InputStream is=ss.getInputStream(); OutputStream os=ss.getOutputStream(); /*what can i do to accept the data from client"hello" ...

15. Changing file    coderanch.com

Hi all, Got a problem that has been bugging me for days.... i have a text file which looks like this: [Database 2] connection=jdbc:mysql://localhost:3306/gene driver=com.mysql.jdbc.Driver username=admin password= What i'm trying to do is to change the values of the variables. For eg, connection=jdbc:mysql://localhost:3306/gene to connection=jdbc:mysql://172.20.136.50:3306/gene This is my code: import java.io.*; public class GetConfig { public static String fileName; public static ...

16. Spotting changes to a MappedByteBuffer    coderanch.com

I am reading large volumes of data from a file into a charting application. As the source file can be tens of MB and data for a single chart display can be several hundred KB, it makes sense to me to use a MappedByteBuffer (MBB). No problem so far. The data from this MBB then needs to be parsed and converted ...





17. Reading Dynamically Changing Files    coderanch.com

I have a tool which generates log messages. These messages are constantly being appended to a log file. I cannot use this file for further processing. So I want to maintain the copy of this file and get the constant updation also. Please tell me. How can I do it with streams.

18. Changing object without altering Serial ID    coderanch.com

We're trying to patch a serialised object used in a production system, we need to add a new field (a java.lang.Long) We were hoping that making the field transient wouldn't change the serialVersionUID, but it looks like it does. We cannot suddenly add our own serialVersionUID or add custom serialisation, are there any other tricks I should try? The root of ...

19. Getting File Date w/o Changing Access Tag    coderanch.com

We're looking at deleting all files on a unix file system that haven't been used in x amount of time. Here's the code we currently use in our jsp: <%! public String getFileModDate(String fname) { int dd,yyyy; String fdate= "", arrMons[] = { "Jan","Feb","Mar","Apr","May","Jun","Jul", "Aug","Sep","Oct","Nov","Dec"}; File f = new File(fname); if(f == null) return "File Not Found"; if(f.canRead()) { Date dt ...

20. Change TimeZone    coderanch.com

Hi, I have an issue regarding timezone as follows can anyone help me out. suppose my database server is iin MST timezone, my application is to be shared across the globe. I want to show the time according to the respective time zone. Is it possible to have generic method to change time zone by simple passing the offset. Rajesh

21. File Change Notification    coderanch.com

Amit, welcome to JavaRanch. Usually, we don't like it if someone wakes the zombies, but I guess your answer will be useful if anyone is searching for this. But do note that the watch service API is not yet available even in today's version of Java (Java 6); this is a new feature that's going to be available in Java 7, ...

22. download file name changing    coderanch.com

23. Change file name without prompt to save    coderanch.com

24. how to change the content of a file    coderanch.com

I think we need some more details - for example, what is the file name (or would you prefer to specify it on the command line), what is the type of file and its contents (e.g. plain text, XML, binary, compressed archive) and what sort of changes do you need to make?

25. Best way to Listen for file changes    coderanch.com

Hi everyone, My question is as follows: What is the best way to code a listener for file changes on a web application? Should it be a singleton? Should I create a listener? I hear that a standard listener with timer can cause memory issues with some applications.. I am using Quartz to run jobs. I want to fire a Quartz ...

26. Changing the system property java.io.tmpdir    coderanch.com

We are using System.getProperty("java.io.tmpdir") in our application running at Sun solaris box and it returns the value "var/tmp".Is there any way i can change the system property so that System.getProperty("java.io.tmpdir") returns "/tmp". I am looking for an option other than System.setProperty("java.io.tmpdir", "/temp"); Thanks and Regards Biju M [ February 12, 2008: Message edited by: Biju muzhikara ]

27. Java program that changes a file's extension    coderanch.com

The name of a file -including its extension- can be changed by the java.io.File.renameTo method. Your example is strange, though - an .xml extension implies that the file is valid XML, which wouldn't be the case for just any old .txt file. (Changing the file extension does not change the file type or file contents.)

28. How to change File properties    coderanch.com

This problem seems more common lately - I wonder if there's a problem from the migration to a new forum. Shibu: what led you to post your question in a forum titled (perhaps confusingly) "Ranch Office"? What made you think that this particular forum was a good place to post? Were you following a link from elsewhere? Can you show us ...

29. Changing File Name Not Working....    coderanch.com

Hi Everyone, I am trying to write a piece of code which changes the file name and removes all the white spaces in it and deletes "-" if it comes for than once in the file name. I have done all the coding part. But the thing when i enter a folder name, none of the file names in the folder ...

30. Changing filename    coderanch.com

I have a file name 1234_abc_abcd_45678_01-05-2010.rtf which I need to remove everything before the 3rd underscore. This is probably easy but I am trying to teach myself Java and don't come from a programming background. Thanks for the help. var filename = "1234_abc_abcd_45678_01-05-2010.rtf"; for (int i = 0; i < fileName.length(); i++) { if (fileName.charAt(i) == '_') { counter++; } } ...

32. file change notification    coderanch.com

Hi, I'm trying to implement a file change notification. I mean i want to be notifyed when some changes occured in a directory. I can't use java 7 ... I want to use DefaultFileMonitor from Apache common. Here is a sample code which is working : import org.apache.commons.io.FileUtils; import org.apache.commons.vfs.FileChangeEvent; import org.apache.commons.vfs.FileListener; import org.apache.commons.vfs.FileObject; import org.apache.commons.vfs.FileSystemManager; import org.apache.commons.vfs.VFS; import org.apache.commons.vfs.impl.DefaultFileMonitor; import ...

33. Reload a File when changes happen in that file    coderanch.com

That's an interesting question. My first idea would be to set up a thread polling files (or a list of files) for changes, and firing events when such a change was detected. Then you could observe that. (Be sure to put in some sleep time though, so that thread doesn't eat up all of your CPU.) Another approach would be to ...

34. Value changes from "1" to "l" after reading to file    coderanch.com

I have a very confusing situation. In my program, I write an Array to file, then manipulate parts of the array and write it to file again. However, in between some of the identifiers, stored as String, with value 1 turn into an l sometime after writing them to file the first time. Again, this field is a String identifier...it is ...

36. Separate files created upon change in SerialNo. doesnot contain full data.    java-forums.org

Hi I have a query which gives me data related to schools in a county. the data contains information abt ..i am giving sample data below. sno. classname schoolname year 1 class3 KPMG 2010 1 class9 GTNS 2009 1 class4 KAT 2008 2 class2 ABCS 2009 2 class3 DALS 2010 2 class1 DHPS 2010 2 class4 SAMS 2005 2 class6 WQAS ...

37. Problems changing file name    java-forums.org

Hi guys, Im starting to learn java and I'm having a little trouble remaming a file. My program creates the file on the desktop and renames it but when I try to print the name of the file in the console its come up with the original file name. Any help would be great!! thanks! import java.util.Scanner; import java.io.*; import java.util.*; ...

38. Change file attributes    java-forums.org

39. How do you change a java program to a single file executable file?    forums.oracle.com

Hey guys I'm back with another new to java question i would like to have my java program that i made into an executable single file, i currently have my project compressed into a JAR file, and its working fine when i go click on it in the file that its in, it works fine but it has to be in ...

40. changing random filename    forums.oracle.com

41. File Date Change in Java    forums.oracle.com

42. How to modify files (change data in a file)    forums.oracle.com

43. FileListener not catching file change    forums.oracle.com

/** * Class for monitoring changes in disk files. * Usage: * * 1. Implement the FileListener interface. * 2. Create a FileMonitor instance. * 3. Add the file(s)/directory(ies) to listen for. * * fileChanged() will be called when a monitored file is created, * deleted or its modified time changes. */

44. change file location to /URIURL    forums.oracle.com

45. How to change the owner of a file    forums.oracle.com

Hello Guys, I can not find an answer for this anywhere on the net. I am trying to change the user of a file. this is the scenario. joe owns a file. i want java code that will be run under the user martin to change the ownership of the file owned by joe to martin. Is there any method in ...

46. Looking for libraries to change files    forums.oracle.com

My professor who is the project leader on that senior design project encouraged us to use ready code and not do everything from scratch (off course with proper documentation) , but when it comes to conversion all he said is that he would like to convert all files to pdf, now while i do realize it obviously can't be done because ...

47. File IO: waiting for changes to be actually made to the filesystem    forums.oracle.com

Hello. I' ve multiple threads that access concurrently to a file. The operations are: -open the file file1 -copy some lines to a new file file2 -delete the old file file1 -rename file2 into file1 the method is synchronized. The problem is that, even after I close the files and return from the method, changes are not still propagated to file ...

48. compare two file data using and find out changes    forums.oracle.com

Hi Friends, I have one file that contains multiple contact information. one contact info contains name,address,phone number like that. All info is stored in JSON string format ( like key-value pair) Now if somebody changes by modifying person name or phone number, than I want to find what was changed. I found one way to use java.util.property class, - use one ...

49. How can I Listen to the File changes?    forums.oracle.com

Hi all, I am confused in this problem. How can I make my program listen to the changes in a file. File is not opened in java program, but it is a outside file. User is not concerned with java program. User opens a file by double clicking and changes something in file. I want to make my java program listen ...

50. how to change the mode of a file dynamically?    forums.oracle.com

hey don't u know after compilation .java file we get .class file.. & this is java forum & that's y i simply pasted my query.. any ways my problem is.. i m creating one .java file dynamically and after that i m compiling it .. & it is successfully creating .class file... after doing my operations i want to delete that ...

51. Changing the system property java.io.tmpdir    forums.oracle.com

We are using System.getProperty("java.io.tmpdir") in our application running at Sun solaris box and it returns the value "var/tmp" .Is there any way i can change the system property so that System.getProperty("java.io.tmpdir") returns "/tmp" instead of above mentioned. After fe analysis i got the below option to change it. I am looking for options other than this System.setProperty("java.io.tmpdir", "/temp");

52. Changing the system property java.io.tmpdir    forums.oracle.com

We are using System.getProperty("java.io.tmpdir") in our application running at Sun solaris box and it returns the value "var/tmp".Is there any way i can change the system property so that System.getProperty("java.io.tmpdir") returns "/tmp". I am looking for an option other than System.setProperty("java.io.tmpdir", "/temp"); Thanks and Regards Biju M Edited by: itsforme on Feb 12, 2008 12:35 AM

53. Changing of file extension    forums.oracle.com

The Java File class doesn't recognise extensions as such. ".jad" is just seen as a string of four characters that may or may not be present at the end of a file name. (1) Find the files in the directory for example with the File list() method (2) Check whether the file name ends with ".jad" with the String endsWith() method ...

54. automately change many files' propety    forums.oracle.com

hello, I just wonder which area I should look into if I want to create a small program that allows me to change some files property automately. e.g. 10 mp3 songs with different album name, and my program will change all mp3 songs' album name automately to a consistent album name, which I give. Thank you

55. Read a file without changing its access time ?    forums.oracle.com

1) Is it possible to read a file using a fileInputStream but without updating its Last Access Time ? 2) Or maybe someway to first get the Last Access Time, then read the file and then change the access time of that file back to what it was before the read ? 3) Is it possible to do this using any ...

56. File Download and to change the Modified date of the downloaded file    forums.oracle.com

When we download a file then the time Issue is The Original file was created & Modified on say 3 Oct 2007 The downloaded file 's creation date will the date when we do the download operation.The Date of accessed/ Modified also will be the date as of downloaded date & time. I need to change the Modified date attribute during ...

57. Create a new HTML file by changing attributes    forums.oracle.com

58. Changing default file location    forums.oracle.com

Hello, I am reading a string (xxxx.jsp) from an xml file, and I want to check wether this page exists. Now I was trying to accomplish this with the File type. But I cannot get the exact thing I want. I am using Netbeans (5.5) and it takes the bundled apache tomcat bin folder as home for some reason. How do ...