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
image handling or jpeg packages. If necessary you could probably write a simple JNI wrapper to
a native library if it provides the functionality you need.
matfud

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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.

How to read in JPEG file properties

Hello AS Community!
I am wondering if there is some way to do the following:
(1) I have a folder filled with JPEGS with which I can have
my SWF access via XML.
(2) I would like to create two arrays, one filled with the
widths (in pixels) and the other with heights (in pixels) of all of
these JPEGs in the aforementioned folder.
I am not interested in loading/viewing any of the JPEGs from
this folder into my SWF, I really just want the SWF to use each
image's width/height information for something else.
Do you know how when you right-click in Windows and choose
"Properties" of a JPEG image, you can see the width/height values
of said JPEG in pixels? It is these properties that I would like to
load into arrays. I know how to create and load up arrays, so that
is not the topic of this post, but rather how do I read in these
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Any help would be greatly appreciated,
-john

ropeGun wrote:
> Hello AS Community!
>
> I am wondering if there is some way to do the following:
>
> (1) I have a folder filled with JPEGS with which I can
have my SWF access via
> XML.
> (2) I would like to create two arrays, one filled with
the widths (in pixels)
> and the other with heights (in pixels) of all of these
JPEGs in the
> aforementioned folder.
>
> I am not interested in loading/viewing any of the JPEGs
from this folder into
> my SWF, I really just want the SWF to use each image's
width/height information
> for something else.
>
> Do you know how when you right-click in Windows and
choose "Properties" of a
> JPEG image, you can see the width/height values of said
JPEG in pixels? It is
> these properties that I would like to load into arrays.
I know how to create
> and load up arrays, so that is not the topic of this
post, but rather how do I
> read in these Windows "intrinsic" width/height
properties?
>
> Any help would be greatly appreciated,
>
> -john
>
Hi ropeGun,
You're only really going to achieve this with a server side
script
written in PHP, ASP etc. You can then get the script to loop
through the
folder and examine each file and store it's width and height.
How you
then pass this information back to Flash is down to your
personal
preference. You could go the 'name/value' pairs route, but
with a large
directory you run the risk of loading in a rather large
amount of data
in a less than ideal format.
A more concise route would be to use some form of remoting
like AMFPHP
(www.amfphp.org) and just get the PHP to make the Arrays too
and pass
the complex data back all at once. This will save processing
and
mangling once it hits Flash.Leaving you with just hooking up
the arrays.
Obviously if you were loading them in then you could just
grab these
values once loaded, but this isn't your goal as you have
already indicated.
Might I suggest you use a multi-dimensional array to store
these width
and height values in. It will make accessing the values far
easier and
will make sure you only have to contend with one index per
JPG
dimensions. I suspect you were already planning on doing that
anyhoo :D
HTH
regs
m
Mike Jones
FlashGen.Com
w./ www.flashgen.com
e./ forum_postsATflashgenDOTcom
b./ blog.flashgen.com

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
their own favicon files for their site. To allow compatibility with
IE I want to allow for .ico files but I need to determine their
dimensions so that I can limit the size. The restrictions of the
JVM mean that Coldfusion can't read or write .ico files and I was
wondering if anyone had any suggestions.
I'm currently trying to write a function which uses the Java
JIMI library (
JIMI) but it's not
simple and keeps preventing me from deleting images once I've read
them (possibly because I'm using it wrongly).
If anyone can help then that'd be great.

A
posting
on image processing made me have another look at your problem.
I think you should install the
hotfixes.
One of them actually solves the problem whereby
"CFImage and the image functions can leave an image file locked
after an initial write to disk in Adobe ColdFusion 8.0.1."

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.

Reading/Writing Excel Files

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).
please provide some example ,Also,is there some alternative for readind data?
Thanks

See for example XML rlated taglibs in Coldtags suite:
http://www.servletsuite.com/jsp.htm

Reading/Writing JPEG file headers

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