Reading/Writing multiple files

Hey,
I've got a folder on my computer with 100+ text files. So I'm
trying to make a projector that, once I've chosen a directory, will
go through all the files in that folder looking for a certain
string. I know how to use the FileXtra4 to set the directory, and
I've had programs read and write to files before, but I'm not sure
how to do it on such a large scale.
If anyone can help it would be greatly appreciated.

You can use Director's command getNthFileNameInFolder() to
mke a list of
all the files in a given folder, then use pRegEx to search
through the
text of each one.
A much easier way would be to use BuddyAPI. It has a command
called
baFileList() which will give you the names of all the files
in a folder,
then you can use pRegEx or another xtra to search through
each one. The
same folks who brought us BuddyAPI also make budFile which
can do the
text search in a much easier way than pRegEx (though it will
likely be a
bit slower). Though it is terribly confusing and hard to use
if you are
not familiar with regular expressions, it is by far the
fastest method
of searching text.

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Reading/Writing Multiple Files From/To Socket

I'm have a problem in recognizing end of file in socket.
when I write files one after another using object input stream wrapped on the socket's input stream.
on one side:
while((n = send_file_input_stream[ i ].read(buff)!=-1)
socket_output_stream.write(buff,0,n)
on the other side:
while((n = socket_input_stream.read(buff)!=-1)
recv_file_output_stream[ i ].write(buff,0,n)
this process happens for i=1..N files
1) how can i signal the socket That EOF occures ?
2) how can the recieving socket stream recognize it?
3) Is there a simple mechnism for transffering files in java
from dir to dir from disk to socket ?
like copy(InputStream from,OutputStram to)
Thanks
Joseph

one way is to write something as an end of file marker after each file, say character 255, just make sure you escape any 255's in the file (say by sending two 255's)
The other end then needs to look for the 255's, if it gets one on its own its the end of the file. If it get's two together its a single 255 thats part of the file.
If that seems a bit complicated you could send a header with the count of bytes before each file, the receiving end then just has to count bytes.
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Reading/Writing .xlsx files using Webdynpro for Java

Dear All
I have a requirement to read/write excel files in .xlsx format. I am good in doing it with .xls format using jxl.jar. The jxl.jar doesn't support .xlsx format. Kindly help me in understanding how do I need to proceed on reading/writing .xlsx files using Webdynpro for Java.
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i am using jdk 1.6.22 and IBM WebSphere
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The project was not built since its classpath is incomplete. Cannot find the class
file for java.lang.Iterable. Fix the classpath then try rebuilding this project.
This compilation unit indirectly references the missing type java.lang.Iterable
(typically some required class file is referencing a type outside the classpath)
how can i resolve it
here is the code that i have used
public class HomeAction extends DispatchAction {
     public ActionForward addpage(
                         ActionMapping mapping,
                         ActionForm form,
                         HttpServletRequest request,
                         HttpServletResponse response)
                         throws Exception {
                         String name = "C:/Documents and Settings/bharath/Desktop/Book1.xlsx";
           FileInputStream fis = null;
           try {
               Object workbook = null;
                fis = new FileInputStream(name);
                XSSFWorkbook wb = new XSSFWorkbook(fis);
                XSSFSheet sheet = (XSSFSheet) wb.getSheetAt(0);
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Writing multiple files using UTL_File package

Hi,
I have an requirement where I need to read the flat file and based on the first 3 character in each line which will be compared with the FlagTable, I have to create and move data into different files.
I'm using Oracle 11g in Windows xp platform.
Example:
Content of the FlatFile:
ND1T00XNDCNON0080
[email protected]
XR1 0000000179CONVERSION
PT1006 ON00014
XR195010120391231P0012 19950101 0000000179CONVERSION
ND2995010120391231a000000000000000000
XR2 0000000416PP C941995010120391231PP0012 19950101
GP206 0120391231a000
GP2061231a00000000000000 1231a0000000000000
FlagTable:
Id     Flagtype Flag
1     ND1     Y
2     ND2     Y
3     GP2
4     XR1     Y
5     XR2
6     PT1
Possible output should be (duplicate files should not be created)
BP_ND1.txt
ND1T00XNDCNON0080
ND151995010120391231a0000000000000000000000000000XNDCNON0080
BP_ND2.txt
[email protected]
ND2995010120391231a000000000000000000
BP_XR1.txt
XR1 0000000179CONVERSION
XR195010120391231P0012 19950101 0000000179CONVERSION
BP.txt
PT1006 ON00014
XR2 0000000416PP C941995010120391231PP0012 19950101
GP206 0120391231a000
GP2061231a00000000000000 1231a0000000000000
Please let me know, if more info is required.
Regards,
Lokesh

How your task is related to Oracle?
This better be done with Perl or VB or whatever, but not with using RDBMS.

Reading/writing PDF files using JAVA

how to read/write a PDF file using java,
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how to convert those files to readable format.?
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is there any special class for doin that.?Yes, I'm sure Google knows a few libraries that ca do that.

BPEL reading/writing a file

Hi,
To test my BPEL process, I am using FileAdapter to read from a file/write to a file. It works fine with my localhost as the SOA server. When I deploy to the development server, is there anyway I can put the file inside the project and deploy it as part of the jar file?
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Yes it sounds strange that you want move the file you are reading. This can be done via the ant script although I haven't used the FTP task. Create a pre-build.xml file. this will be called by the build.xml. Have a look at this link http://ant.apache.org/manual/index.html
Otherwise if you just want to change the directory location based on the environment, use the logical path this means you can update the location in the BPEL console.
You can also use a parameter in the properties file. you need a pre-build.xml and post-build.xml
pre-build.xml
<?xml version="1.0"?>
<project name="bpel.pre-build" default="pre-build" basedir="./bpel">
<property name="xxsoa_log_dir_deploy" value="${xxsoaLogDir}"/>
<target name="pre-build">
<bpelc input="${basedir}/bpel.xml" rev="${rev}" deploy="${domain}" force="true">
<customize>
<partnerLinkBinding name="WriteHTMLService">
<property name="wsdlLocation">WriteHTMLService.wsdl</property>
<property name="XXSOA_LOG_DIRECTORY">${xxsoa_log_dir_deploy}</property>
<property name="retryInterval">60</property>
</partnerLinkBinding>
</customize>
</bpelc>
<copy file="bpel.xml" tofile="bpel_orig.xml" overwrite="true"/>
<copy file="_bpel.xml" tofile="bpel.xml" overwrite="true"/>
</target>
</project>
post-build.xml
<?xml version="1.0"?>
<project name="bpel.post-build" default="post-build" basedir="./bpel">
<target name="post-build">
<echo>
| Copying bpel_orig.xml to bpel.xml
</echo>
<copy file="bpel_orig.xml" tofile="bpel.xml" overwrite="true"/>
</target>
</project>

Reading from multiple files

I have a number of text files within a directory and I want to read the contents of all of them so that I can then output the information within them to the screen.
I thought that I could use something like
File foofile = new File("//tmp//foo//");
String []files = foofile.list();
try {
FileReader fr = new FileReader ( files );
BufferedReader in = new BufferedReader( fr );
String line;
while ((line = in.readLine()) != null)
networkPout.write(line);
meaning that I would open the directory and then read in the file names that are within it into an array then i could go through and open the files with the array. But this dosent seem to work anyone got any ideas?

try this:
File foofile = new File("//tmp//foo//");
String []files = foofile.list();
try {
for(int i = 0; i < files.length; i++)
FileReader fr = new FileReader ( files);
BufferedReader in = new BufferedReader( fr );
String line;
while ((line = in.readLine()) != null)
networkPout.write(line);
ARB

Reading & writing to file using ArrayList String incorrectly

Hi Java Experts,
I am running out of ideas on why my findSnomedCodes.java program is filling up the output file (Snomed-Codes.txt) with the
same information ([M44110|T33010, , M92603|T10350, ]) continuously. This program goes through a dummy patient result file
and pickup the 3rd line of each record and insert it into an ArrayList of String before writing it into a Snomed-Codes.txt
file. A followed up method prints out everything from Snomed-Codes.txt.
Below is the source code of findSnomedCodes.java program:
import java.io.*;
import java.io.IOException;
import java.lang.String;
import java.lang.Character;
import java.util.regex.*;
import java.util.ArrayList;
import java.util.List;
public class FindSnomedCode {
static List<String> complete_records = new ArrayList<String>();
static public void getContents(File existingFile) {
StringBuffer contents = new StringBuffer();
BufferedReader input = null;
int line_number = 0;
int number_of_records = 0;
String snomedCodes = null;
try {
input = new BufferedReader( new FileReader(existingFile) );
String current_line = null;
while (( current_line = input.readLine()) != null) {
// Create a pattern to match for the "\"
Pattern p = Pattern.compile("\\\\");
// Create a matcher with an input string
Matcher m = p.matcher(current_line);
boolean beginning_of_record = m.find();
if (beginning_of_record) {
line_number = 0;
number_of_records++;
} else {
line_number++;
if (line_number == 2) {
snomedCodes = current_line;
System.out.println(snomedCodes);
complete_records.add(current_line);
catch (FileNotFoundException ex) {
ex.printStackTrace();
catch (IOException ex){
ex.printStackTrace();
finally {
try {
if (input!= null) {
input.close();
catch (IOException ex) {
ex.printStackTrace();
static public void setContents(File reformatFile, List snomedCodes)
throws FileNotFoundException, IOException {
Writer output = null;
try {
output = new BufferedWriter( new FileWriter(reformatFile) );
while (snomedCodes.iterator().hasNext())
output.write( snomedCodes.toString() );
finally {
if (output != null) output.close();
static public void printContents(File existingFile) {
//...checks on existingFile are elided
StringBuffer contents = new StringBuffer();
BufferedReader input = null;
int line_number = 0;
int number_of_records = 0;
long total_number_of_lines = 0;
String snomedCodes = null;
try {
input = new BufferedReader( new FileReader(existingFile) );
String current_line = null;
while (( current_line = input.readLine()) != null)
System.out.println(current_line);
catch (FileNotFoundException ex) {
ex.printStackTrace();
catch (IOException ex){
ex.printStackTrace();
finally {
try {
if (input!= null) {
input.close();
catch (IOException ex) {
ex.printStackTrace();
public static void main (String args[]) throws IOException {
File currentFile = new File("D:\\AP Data Conversion\\1988\\dummy_test_records.txt");
getContents(currentFile);
File snomedFile = new File( "D:\\AP Data Conversion\\1988\\Snomed-Codes.txt");
setContents(snomedFile, complete_records);
printContents(snomedFile);
The output from Netbeans/Java is as follows:
M44110|T33010
M92603|T10350
Exception in thread "main" java.io.IOException: There is not enough space on the disk
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:260)
at sun.nio.cs.StreamEncoder$CharsetSE.writeBytes(StreamEncoder.java:336)
at sun.nio.cs.StreamEncoder$CharsetSE.implClose(StreamEncoder.java:427)
at sun.nio.cs.StreamEncoder.close(StreamEncoder.java:160)
at java.io.OutputStreamWriter.close(OutputStreamWriter.java:222)
at java.io.BufferedWriter.close(BufferedWriter.java:250)
at FindSnomedCode.setContents(FindSnomedCode.java:90)
at
FindSnomedCode.main(FindSnomedCode.java:134)---------------------------------------------------------------------------------
The content of Snomed-Codes.txt file is filled with continuous lines of [M44110|T33010, , M92603|T10350, ] as follows:
[M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, ,
M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350,
][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, ,
M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350, ][M44110|T33010, , M92603|T10350,
I must have done something wrong with the ArrayList.

while (snomedCodes.iterator().hasNext())
output.write( snomedCodes.toString() );
}Here you have some kind of a list or something (I couldn't stand to read all that unformatted code but I suppose you can find out). It has an iterator which gives you the entries of the list one at a time. You keep asking if it has more entries -- which it does -- but you never get those entries by calling the next() method, so it always has all the entries still available.
And your code inside the loop is independent of the iterator, so it's rather pointless to iterate over the entries and output exactly the same data for each entry. Even if you were iterating correctly.

Reading & writing to file using ArrayList String incorrectly (2)

I have been able to store two strings (M44110|T33010, M92603|T10350) using ArrayList<String>, which represent the result of some patient tests. Nevertheless, the order of these results have been stored correctly.
E.g. currently stored in file Snomed-Codes as -
[M44110|T33010, M92603|T10350][M44110|T33010, M92603|T10350]
Should be stored and printed out as -
M44110|T33010
M92603|T10350
Below is the detail of the source code of this program:
import java.io.*;
import java.io.IOException;
import java.lang.String;
import java.util.regex.*;
import java.util.ArrayList;
public class FindSnomedCode {
    static ArrayList<String> allRecords = new ArrayList<String>();
    static public ArrayList<String> getContents(File existingFile) {
        StringBuffer contents = new StringBuffer();
        BufferedReader input = null;
        int line_number = 0;
        int number_of_records = 0;
        String snomedCodes = null;
        ArrayList<String> complete_records = new ArrayList<String>();
        try {
            input = new BufferedReader( new FileReader(existingFile) );
            String current_line = null;
            while (( current_line = input.readLine()) != null) {
                // Create a pattern to match for the "\"
                Pattern p = Pattern.compile("\\\\");
                // Create a matcher with an input string
                Matcher m = p.matcher(current_line);
                boolean beginning_of_record = m.find();
                if (beginning_of_record) {
                    line_number = 0;
                    number_of_records++;
                } else {
                    line_number++;
                if ( (line_number == 2) && (current_line.length() != 0) ) {
                    snomedCodes = current_line;
                    System.out.println(snomedCodes);
                    complete_records.add(current_line);
        catch (FileNotFoundException ex) {
            ex.printStackTrace();
        catch (IOException ex){
            ex.printStackTrace();
        finally {
            try {
                if (input!= null) {
                    input.close();
            catch (IOException ex) {
                ex.printStackTrace();
        return complete_records;
    static public void setContents(File reformatFile, ArrayList<String> snomedCodes)
                                 throws FileNotFoundException, IOException {
       Writer output = null;
        try {
            output = new BufferedWriter( new FileWriter(reformatFile) );
              for (String index : snomedCodes) {
                  output.write( snomedCodes.toString() );
        finally {
            if (output != null) output.close();
    static public void printContents(File existingFile) {
        StringBuffer contents = new StringBuffer();
        BufferedReader input = null;
        int line_number = 0;
        int number_of_records = 0;
        String snomedCodes = null;
        try {
            input = new BufferedReader( new FileReader(existingFile) );
            String current_line = null;
            while (( current_line = input.readLine()) != null)
                System.out.println(current_line);
        catch (FileNotFoundException ex) {
            ex.printStackTrace();
        catch (IOException ex){
            ex.printStackTrace();
        finally {
            try {
                if (input!= null) {
                    input.close();
            catch (IOException ex) {
                ex.printStackTrace();
    public static void main (String args[]) throws IOException {
        File currentFile = new File("D:\\dummy_patient.txt");
        allRecords = getContents(currentFile);
        File snomedFile = new File( "D:\\Snomed-Codes.txt");
        setContents(snomedFile, allRecords);
        printContents(snomedFile);
}There are 4 patient records in the dummy_patient.txt file but only the 1st (M44110|T33010) & 3rd (M92603|T10350) records have results in them. The 2nd & 4th records have blank results.
Lastly, could someone explain to me the difference between java.util.List & java.util.ArrayList?
I am running Netbeans 5.0, jdk1.5.0_09 on Windows XP, SP2.
Many thanks,
Netbeans Fan.

while (snomedCodes.iterator().hasNext())
output.write( snomedCodes.toString() );
}Here you have some kind of a list or something (I couldn't stand to read all that unformatted code but I suppose you can find out). It has an iterator which gives you the entries of the list one at a time. You keep asking if it has more entries -- which it does -- but you never get those entries by calling the next() method, so it always has all the entries still available.
And your code inside the loop is independent of the iterator, so it's rather pointless to iterate over the entries and output exactly the same data for each entry. Even if you were iterating correctly.

Reading/writing .ico files

I'm working on a coldfusion system where users can upload
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A
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I'm looking for a relatively straightforward way to read data from a .xls file and write out to another one using only standard java facilities, so no open source library suggestions please.

Excel can be accessed via JDBC, have a search for that, can't remember the details - just a JDBC name string. But really your best choice is the Jxl or JExcel (or whatever it's called) library. Apache POI is to be avoided, having the curious distinction of being both bloated and incomplete, as well as shocking performance.

Reading/writing XML files

hi
i want to makeXML based config files for my system,i didn`t example to write/read XML files(parsing).
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Reading/Writing JPEG file headers

Hi,
I am trying to take a JPEG file and read the markers in the file header. I might also want to add/alter markers in the header to alter images. This is the start of a big project managing JPEG files but unfortunately I don't know where to start with the Java in manipulating the JPEG files. Can anyone point me to any examples or tutorials etc.
Thanks a million,
HJ Monkey

If you are just interested in modifying tags in the headers then try the ImageIO (jdk1.4) package.
If this does not provide the functionality you need then try JAI or one of the many freely available
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matfud

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Hello,
I am trying to enable a great amount of files for commenting with Adobe Reader 9. I know how to enable each single file through the comments menu, but doing this for 1000+ files could take me quite a bit of time. Is there any way to automatize this process? Somehow I can't find that option through batch processing... Thanks!

Specifically, NO, with Acrobat. Adobe sell a high end product, once
called LiveCycle Reader Extensions but I've lost track of the name,
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We currently have file corruption problems which we have been able to reproduce on our system which uses WinCE 6.0R3. We have an SDCard in our system which is mounted as the root FS. When multiple files are being written to the file system we occasionally
see file corruption with data destined from one file, ending up in another file, or in another location in the same file. We have already written test SW that we have been able to use to reproduce the problem, and have worked with the SDCard vendor to
check that the memory controller on the card is not the source of the problems.
We know that the data we send to WriteFile() is correct, and that the data which eventually gets sent through the SDCard driver to the SD card is already corrupted.
We believe that the problem is somewhere in the microsoft private sources between the high level filesystem API calls and the low level device calls that get the data onto the HW.
We have confirmed that the cards that get corrupted are all good and this is not a case ofpoor quality flash memory in the cards. The same cards that fail under WinCE 6.0R3 never fail under the same types of testing on Windows, Mac OX, or linux. We
can hammer the cards with single files writes over and over, but as soon as multiple threads are writing multiple files it is only a matter of time before a corruption occurs.
One of the big problems is that we are using the sqlcompact DB for storing some data and this DB uses a cache which get's flushed on it's own schedule. Often the DB gets corrupted because other files are being written when the DB decides to flush.
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Peter

All QFE's have been applied we are building the image so we have some control.
I have build an image which used the debug DLL's of the FATFS and I have enabled all of the DebugZones. The problem is still happening. From the timings in the debug logs and the timestamps in the data which corrupts the test file I have been able
to see that the file is corrupted AFTER the write is complete. Or at least that's how it seems.
We finished writing the file and closed the handle. Then more data is written to other files. When we get around to verifying the file it now contains data from the files that were subsequently written.
What I think I need to do is figure out in detail how the two files were "laid down" onto the SDCard. If the system used the same cluster to write the 2 files then that would explain the issue.

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