Reading data from Hashtable in another file

how do i read the data from Hashtable which is created in another file. The file which creates hashtable is continuously running , and i want to read the content of the hash table into another file. Both the file exist in same machine.
Help needed.
Ancitipated Thanks

Then you mean "class" or "object", not "file". Yes, you see the details of these classes in the source code files, and the compiled classes are kept in files, but programmers don't think of the files, they think of the objects running in the JVM. By calling them "files" you're causing confusion.
Anyway, multiple threads can access a hashtable, which is synchronized apparently. So that alone shouldn't be a problem. If you have one object adding to a hashtable while another is reading its contents via an iterator, that could cause ConcurrentModificationExceptions.

Similar Messages

Static lookup lists:read data from a Java *.properties file

Hi
i need to make static lookup lists i am using read data from a Java *.properties file
i am using the Class "PropertyFileBasedLookupViewObjectImpl" that wrote by Steve Muench in ToyStore.
but i need to use the default language for that i update the loadDataFromPropertiesFile()
method to find the correct properties file
String temp=Locale.getDefault().getLanguage();
String propertyFile =
getViewDef().getFullName().replace('.', '/')+"_"+temp+ ".properties";
the problem:
For English(TEST_en.properties) it is good and working
For Arabic(TEST_ar.properties) read from correct file _ar.properties
but the dispaly character is wrong
When Debug
In the File 1=دمشق
In debug 1=/u32423

Depending on your use case you can either use a programmatic VO or directly expose the JV class as a data control.
http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_36/jdtut_11r2_36.html

Best way to browse and read data from a lot of files?

Hi All,
I am trying to read tags from music files. Currently I'm listing all the files and then reading through the tags, as below:
List<File> result = new ArrayList<File>();
FilenameFilter mp3filter = new FilenameFilter() {
     public boolean accept(File dir, String name) {
          return name.endsWith(".mp3");
FilenameFilter wmafilter = new FilenameFilter() {
     public boolean accept(File dir, String name) {
          return name.endsWith(".wma");
FileFilter dirFilter = new FileFilter() {
     public boolean accept(File file) {
          return file.isDirectory();
File[] dirList = aStartingDir.listFiles(dirFilter);
File[] mp3files = aStartingDir.listFiles(mp3filter);
File[] wmafiles = aStartingDir.listFiles(wmafilter);
List<File> filesDirs = Arrays.asList(dirList);
List<File> filesMp3 = Arrays.asList(mp3files);
List<File> filesWma = Arrays.asList(wmafiles);
for (File file : filesMp3) {
     result.add(file);
for (File file : filesWma) {
     result.add(file);
for (File file : filesDirs) {
     List<File> deeperList = getFileListing(file);
     result.addAll(deeperList);
}and then read the files in a for loop through the list.
Is there a better way to do the same?

Well, you could optimize that just a little bit by only calling listFiles once with a filter that would accept directories, wmas, and mp3s all in one go. Then you could iterate through the results and separate them into the three categories after you had the complete recursive directory listing. That may be faster. But your OS will likely cache the results of the directory listing, thus minimizing the effort of your current approach. But honestly, no... you need the headers from every file, so you'll need to find each file and then check the headers.
If you want, you can cache the results somewhere for future reference. Are you concerned about performance or some such?

Reading data from a static excel file

Hi all
I got the answer for attching excel file. But i want to read the contents from the uploaded file and save it in context variables.
How is it done? Please reply soon. Its very urgent.
Thanks & regards
Aparnna

Check this too
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/edc2f3c2-0401-0010-8898-acd5b6a94353
Regards, Anilkumar

How to read data from PDF and HTML file

I have got solution to read text form .txt file but did'nt get code for PDF and HTML.
I dont want to convert PDF to txt.
Please help me ...

ah crap i could have guessed there would be a crosspost only the forum in where the crosspost is made is abit funny
To OP: DO NOT CROSSPOST
http://forum.java.sun.com/thread.jspa?threadID=5267875&tstart=0

Read datas from HTML or XML file in LabView

Hi all,
I need help in the following. I need to read the measurement results from test report into LabView. Test report format is HTML or XML. Please give me some advice on how to do this?
Thank you.
Mik

A quick search through the forums will point you to this thread which has some excellent advice and a effecient parser vi
Jeff

Read lines from more than 1 file of different file extensions, extract the data and output to screen

Hi,
I am trying to read data from more than one file at once. The files are different types e.g. one is a text file one is an xml file like so, StudentInformation.txt, CollegeInformation.xml. The files are all stored in one place, in this case on the D drive of
a local computer. I am trying to locate any files in the D drive with a file extension of .txt or of .xml (there may be more than two of these files in the future, so I'm trying to allow for that). Then I want to open all of these files, extract the information
and output all the information in one display window. I want all the information from these two or more files to be displayed together in the display window.
Here is the code so far. It is throwing up errors.
//Load from txt or xml files
private void btnLoad_Click(object sender, RoutedEventArgs e)
IEnumerable<string> fileContents = Directory.EnumerateFiles("D:\\", "*.*", SearchOption.TopDirectoryOnly)
.Select(x => new FileInfo(x))
.Where(x => x.Extension == ".xml" || x.Extension == ".txt")
.Select(file => ParseFile(file));}
private string ParseFile(FileInfo file)
try
using (StreamReader sr = new StreamReader(file.FullName))
string line;
while ((line = sr.ReadLine()) != null)
//Logic here to determine if this is the correct file and append accordingly
lbDisplay.Items.Add(line);
return line;
catch (Exception ex)
// Let the user know what went wrong
MessageBox.Show("The file could not be read: ");
MessageBox.Show(ex.Message);
The error it throws up is:
Error 1
'BookList.MainWindow.ParseFile(System.IO.FileInfo)': not all code paths return a value

This is the Small Basic programming language so moving to a C# forum.
But you need all paths to return a value, including if an exception is called and it jumps to the catch, perhaps just:
// Let the user know what went wrong
MessageBox.Show("The file could not be read: ");
MessageBox.Show(ex.Message);
return "";

How to read data from a file that is already open by another program

Hey..
I have made IV, where I'm trying to read data from a log file, that is being updated by another program while my IV runs.
To be clear, this program writes data continuously to this file and I want to read from the file in LV at the same time.
The problem is that LV reports an error when I'm trying to read the log file, even if I use to "read only" mode.
I believe that the program that is producing the file, have some kind of lock on the file. I have tryed to copy the file and then reading from the copied file, but LV throws already an error when I try to copy the file.
Has anyone tryed this, and found a solution.?
Additional info: The program that produces the file is STM Studio
Best Regards
Allan

Hi Alha,
when that file is locked by the other program you can't do anything about that - apart from quitting that other program. Probably this isn't an option to you…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

View Object to read data from a java file

Hi,
I am using JDeveloper 11.1.1.4 and ADF-BC in my application.
For one of my view objects , I want the data to be read from a java file which exposes some method to return a collection.
I cannot use a static view object in this case.
Please suggest the best way to implement this requirement.Basically build a view object that should read data from a java file.
Thanks,
Praveen

Depending on your use case you can either use a programmatic VO or directly expose the JV class as a data control.
http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_36/jdtut_11r2_36.html

Read data from a text file, one line at a time.

I need to read data from a text file, and display each line in a String Indicator on Front Panel. It displays each line, but I get Error 4, End Of Line, unless I enter an extra line of data in the file that I don't need. I tried Read From Text File.vi, made by Nat Instr, and it gave the same error.

The Read from Text File.vi reads data from a text file line by line until the user stops the VI manually with the Stop button on the front panel, or until an error (such as "Error 4, End of file") occurs. If an error occurs, the Simple Error Handler.vi pops up a dialog that tells you which error occurred.
The Read from Text File.vi uses a while loop, but if you knew how many lines you wanted to read, you could replace the while loop with a for loop set to read that many lines from the file.
If you need something more dynamic because the number of lines in your files vary, then you could change the code of the Read from Text File.vi to the expect "Error 4, End of file" and handle it appropriately. This would require unbundling the error cluster that comes fro
m the Read File function with the Unbundle By Name function, so that you can expose the individual error "status" and error "code" values stored in the cluster. If the value of the error "code" is 4, then you can change the error "status" from true to false, and you can rebundle the cluster with the Bundle by Name function. Setting the error "status" to false instructs the Simple Error Handler to ignore the error. Otherwise, pass the original error cluster to the Simple Error Handler.vi, so that you can see what the error is.
Of course, if you're not interested in what the errors are, you could just remove the Simple Error Handler.vi, but then you wouldn't see any error messages.
Best of Luck,
Dieter
Dieter Schweiss
Applications Engineer
National Instruments

How to read data from a file in OSB

hi guys,
Recently, I've got a problem with reading file from specific location. I've actually followed this post OSB 11g - Read or Poll File in OSB - Oracle Fusion Middleware Blog, and then
I know how to read a file. However, it does not as expected. Because, I've found no way to read data from the file. Therefore, no chance to manipulate the data like assigning to a variable, or extracting ....
Hence, is there any way to read data from file by using proxy service in OSB ??? No Java code ???
by the way, supposed that there is no way to read data from a file in OSB. So, What purposes will the way in the post above be used for?
Many thanks in advance

http://jakarta.apache.org/poi/hssf/index.html
HSSF stands for Horrible Spreadsheet Format, but it still works!

How to read data from a file that was formatted by excel?

Hi everyone, I'm familiar with java.io and the ability to read from files, can anyone tell me how to read data from a file that was formatted by excel? Or at least give me some web references so that I can learn about it?

http://jakarta.apache.org/poi/hssf/index.html
HSSF stands for Horrible Spreadsheet Format, but it still works!

How to read data from a zipped MS Access file?

How to read data from a zipped MS Access file?

RPJ,
You do not need to use the Close Zip File.vi when you unzip a folder. This VI is used when you are creating a zip folder.
As for examples, I found a couple of ActiveX based MS Access examples. These programs look to be pretty basic. For more in depth example I would search Microsoft Developers Network
http://zone.ni.com/devzone/cda/epd/p/id/2188
http://zone.ni.com/devzone/cda/epd/p/id/1694
Regards,
Jon S.
National Instruments
LabVIEW R&D

Reading Data from a SQL table to a Logical file on R/3 appl. Server

Hi All,
We would like to create Master Data using LSMW (direct Input) with source files from R/3 Application Server.
I have created files in the'/ tmp/' directory however I do not know how to read data from the SQL table and insert it into the logical file on the R/3 application server.
I am new to ABAP , please let me know the steps to be done to acheive this .
Regards
- Ajay

Hi,
You can find lot of information about Datasets in SCN just SEARCH once.
You can check the code snippet for understanding
DATA:
BEGIN OF fs,
carrid TYPE s_carr_id,
connid TYPE s_conn_id,
END OF fs.
DATA:
itab    LIKE
          TABLE OF fs,
w_file TYPE char255 VALUE 'FILE',
w_file2 TYPE char255 VALUE 'FILE2'.
SELECT carrid connid FROM spfli INTO TABLE itab.
OPEN DATASET w_file FOR OUTPUT IN TEXT MODE ENCODING DEFAULT. "Opening a file in Application
                                                        " Server to write data
LOOP AT itab INTO fs.
TRANSFER fs TO w_file. "" Writing the data into the Application server file
ENDLOOP.
CLOSE DATASET w_file.
OPEN DATASET w_file FOR INPUT IN TEXT MODE ENCODING DEFAULT. "Opening a file in Application
                                                      " server to read data
FREE itab.
DO.
READ DATASET w_file INTO fs.
IF sy-subrc EQ 0.
    APPEND fs TO itab.
    OPEN DATASET w_file2 FOR APPENDING IN TEXT MODE ENCODING DEFAULT. "Appending more data to the file in the
                                                       " application server
    TRANSFER fs TO w_file2.
    CLOSE DATASET w_file2.
ELSE.
    EXIT.
ENDIF.
ENDDO.
Regards
Sarves

Reading data from an excel file

Hi,
I want to read data from the excel file and display it in
jsp page. Iam getting the following error:
[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con =
DriverManager.getConnection("jdbc:odbc:mydsn","","");
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("select * from [holidays$]");
Here i have created the dsn with the name "mydsn". I have the
following data in the mydsn.dsn file:
[ODBC]
DRIVER=Microsoft Excel Driver (*.xls)
UID=admin
UserCommitSync=Yes
Threads=3
SafeTransactions=0
ReadOnly=1
PageTimeout=5
MaxScanRows=8
MaxBufferSize=2048
FIL=excel 8.0
DriverId=790
DefaultDir=D:\WorkSpace\Projects\VINET\devl\webroot\jsp
DBQ=D:\WorkSpace\Projects\VINET\devl\webroot\jsp\list_of_holidays_2003.xls
thanks in advance
phani.

You might want to look at the POI project (an open source Jakarta sub-project) that allows you to create/modify/read excel files via Java code. That might be more flexible and easier than what you're currently trying to do.
Cheers

Reading data from Hashtable in another file

Similar Messages

Maybe you are looking for