How to display a .jpg in a JAR file

I wrote a programe"demo" to display a "001.jpg "
and I made a demo.jar file
D:\0816>jar -tf demo.jar
META-INF/
001.jpg
Demo.class
META-INF/MANIFEST.MF
I notice that 001.jpg is in the the jar file
but the demo.class can not display it. what can I do?
ps:
Manifest.MF
Manifest-Version: 1.0
Created-By: Ant 1.4.1
Main-Class: Demo

Here is a generic code snippet that you should be able to use.
String myImageFile = "image.jpg";
URL myURL;
ImageProducer myImgProd;
Image myImg;
myURL = getClass.getResource(myImageFile);
try {
imgProd = (ImageProducer) myURL.getContent();
} catch (Exception ex) {
System.out.println(ex.getMessage());
myImg = tool.createImage(myImgProd);

Similar Messages

How to extract the contents of the Jar file?

Hello,
Can anyone tell me how to extract the contents of the Jar file?
An example will be highly appreciated.
Thanks.

From command line, or from within a java application?
Kaj
Btw. Why do you need to do it. You do know that you can add jars to the classpath and read resources from them without extracting the file?

How to combine the classes from 2 jar files into 1?

Hi there
I have got 2 jar files with the same name but the classes that they contain are different. So, I want to combine those 2 files into 1. Could anyone please tell me how to add the classes in a jar file to another jar file?
Thanks for your help!
From
Edmund

The jar utility allows you to extract files as well as put them into a jar. This is in the java docs.
You might have to hand modify the manifest file if it was hand modified in the first place. All you should have to do is copy the text from one file to another. The manifest will have the same name so you will have to extract to different dirs so it isn't overwritten.
Steps:
-Create dir1 and dir2
-Extract jar1 into dir1, Extract jar2 into dir2.
-Manually examine manifests and combine if needed.
-Copy files from one dir to another.
-Use jar tool to create new jar.

Creating BOM using BDC :How to display no of records from flat file under

Hi,
      How to display no of records from flat file under one (Alternative BOM) vertically.
    When i execute, the records are replacing one by one.
Here my coding:
report ZBOM1
       no standard page heading line-size 255.
*include bdcrecx1.
DATA: BEGIN OF bdc OCCURS 0,
       matnr(18),
       werks(4),
       stlan(1),
      END OF BDC.
DATA: BEGIN OF BDC1 OCCURS 0,
       idnrk(18),
       MENGE(18),
       MEINS(3),
       postp(1),
      END OF bdc1.
DATA: BEGIN OF BDCDATA OCCURS 0,
         matnr(18),
         werks(4),
         stlan(1),
         idnrk(18),
         MENGE(18),
         MEINS(3),
         postp(1),
         posnr(4),
      END OF BDCDATA.
data: ibdcdata type standard table of bdcdata WITH HEADER LINE.
*start-of-selection.
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
    FILENAME                      = 'C:\Documents and Settings\dilipkumar.b\Desktop\soft.txt'
   FILETYPE                       = 'ASC'
   HAS_FIELD_SEPARATOR            = ','
HEADER_LENGTH                 = 0
READ_BY_LINE                  = 'X'
DAT_MODE                      = ' '
CODEPAGE                      = ' '
IGNORE_CERR                   = ABAP_TRUE
REPLACEMENT                   = '#'
CHECK_BOM                     = ' '
VIRUS_SCAN_PROFILE            =
NO_AUTH_CHECK                 = ' '
IMPORTING
FILELENGTH                     =
HEADER                         =
TABLES
    DATA_TAB                      = BDCDATA
EXCEPTIONS
FILE_OPEN_ERROR               = 1
FILE_READ_ERROR               = 2
NO_BATCH                      = 3
GUI_REFUSE_FILETRANSFER       = 4
INVALID_TYPE                  = 5
NO_AUTHORITY                  = 6
UNKNOWN_ERROR                 = 7
BAD_DATA_FORMAT               = 8
HEADER_NOT_ALLOWED            = 9
SEPARATOR_NOT_ALLOWED         = 10
HEADER_TOO_LONG               = 11
UNKNOWN_DP_ERROR              = 12
ACCESS_DENIED                 = 13
DP_OUT_OF_MEMORY              = 14
DISK_FULL                     = 15
DP_TIMEOUT                    = 16
OTHERS                        = 17
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
*perform open_group.
loop at bdcdata.
perform bdc_dynpro      using 'SAPLCSDI' '0100'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29N-STLAN'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'RC29N-MATNR'
                              'SOFTDRINKS'.
perform bdc_field       using 'RC29N-WERKS'
                              'WIND'.
perform bdc_field       using 'RC29N-STLAN'
                              '1'.
perform bdc_field       using 'RC29N-DATUV'
                              '16.09.2008'.
perform bdc_dynpro      using 'SAPLCSDI' '0110'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'RC29K-BMENG'
                              '1'.
perform bdc_field       using 'RC29K-STLST'
                              '1'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29K-EXSTL'.
perform bdc_dynpro      using 'SAPLCSDI' '0111'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29K-LABOR'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_dynpro      using 'SAPLCSDI' '0140'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-POSTP(01)'.
perform bdc_field       using 'BDC_OKCODE'
                              '=FCBU'.
perform bdc_field       using 'RC29P-IDNRK(01)'
                              BDCDATA-IDNRK.
perform bdc_field       using 'RC29P-MENGE(01)'
                              BDCDATA-MENGE.
perform bdc_field       using 'RC29P-MEINS(01)'
                              BDCDATA-MEINS.
perform bdc_field       using 'RC29P-POSTP(01)'
                              BDCDATA-POSTP.
perform bdc_dynpro      using 'SAPLCSDI' '0130'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-POSNR'.
perform bdc_field       using 'RC29P-POSNR'
                               BDCDATA-POSNR.            "'0010'.
perform bdc_field       using 'RC29P-IDNRK'
                              BDCDATA-IDNRK.             "'15'.
perform bdc_field       using 'RC29P-MENGE'
                              BDCDATA-MENGE.             "'1'.
perform bdc_field       using 'RC29P-MEINS'
                              BDCDATA-MEINS.             "'ml'.
perform bdc_dynpro      using 'SAPLCSDI' '0131'.
perform bdc_field       using 'BDC_OKCODE'
                              '/00'.
perform bdc_field       using 'BDC_CURSOR'
                              'RC29P-POTX1'.
perform bdc_field       using 'RC29P-SANKA'
                              'X'.
*perform bdc_transaction using 'CS01'.
*perform close_group.
CALL TRANSACTION 'CS01' USING IBDCDATA MODE 'A' UPDATE 'S'.
REFRESH IBDCDATA.
endloop.
       Start new screen                                              *
FORM BDC_DYNPRO USING PROGRAM DYNPRO.
CLEAR iBDCDATA.
iBDCDATA-PROGRAM = PROGRAM.
iBDCDATA-DYNPRO   = DYNPRO.
iBDCDATA-DYNBEGIN = 'X'.
APPEND ibDCDATA .
ENDFORM.
       Insert field                                                  *
FORM BDC_FIELD USING FNAM FVAL.
IF FVAL <> NODATA.
    CLEAR iBDCDATA.
    iBDCDATA-FNAM = FNAM.
    iBDCDATA-FVAL = FVAL.
    APPEND iBDCDATA .
ENDIF.
ENDFORM.

Hi,
the BDCDATA structure must be fnam, fval,dynbegin,dynpro,program.
You have to declare like this and pass this in your CALL TRANSACTION statement.
Please give some other table name for BDCDATA you declared for and also for IBDCDATA.

How do I store images in a jar file to be displayed on a jsp?

Afternoon all,
I have created a java component which accepts some parameters and returns a string. The returned string contains html tags to display a table in a webpage when rendered through a browser.
I want to be able to add this component to any java web project to display my table. The problem is that I want to use images in my table to give the appearance of curved corners.
How do I store images in my component and render to a webpage?
Thanks in advance,
Alex

You won't be able to make the install of this library as simple as the installation of a jar file. You can't access the images directly in the jar.
There are a few approaches you can take:
1 - jar file + resources:
Have the install as being a jar and a "resources" directory which you store all the images in. Thus the images become part of the web application/web site and are accessible. Probably need to allow an entry in web.xml to configure where/what this directory is called.
2 - jar file only:
Provide a servlet to access the images, which will load them from the jar file, using the ClassLoader.getResourceAsStream(). Requires declaration of a servlet in the web.xml file. Won't be as efficient as having the images on disk, but will keep them bundled in the jar file.
you would generate code such as <img src="myImgServlet?img=.....">
Cheers,
evnafets

How do I import classes in a jar file?

I have the following directory structure, each directory is a seperate package of the same name as the directory
RPGUniversal
RPGMap
RPGCharacter
RPGCharacter is not done yet so I am ignoring that package for now.
RPGCharacter and RPGMap both depends on classes inside the RPGUniversal Package, but are independant of eachother and RPGUniversal is completely independant.
I want to place each package in it's own .jar file for use as a library in later programs.
I placed all the compiled classes for RPGUniversal inside the proper directory structure, I then used this command to place it in a jar:
jar -cf ./RPGUniversal.jar ./RPGUniversal/*
I then tested the contents with this command:
exodist@Abydos:/stuff/JProject/test$ jar -tf RPGUniversal.jar
META-INF/
META-INF/MANIFEST.MF
RPGUniversal/ADTs/
RPGUniversal/ADTs/t1.jpg
RPGUniversal/ADTs/t2.jpg
RPGUniversal/ADTs/t3.jpg
RPGUniversal/ADTs/t4.jpg
RPGUniversal/ADTs/Coordinates.class
RPGUniversal/ADTs/RPGImage.class
RPGUniversal/ADTs/FrameSet.class
RPGUniversal/ADTs/ImageTester.class
RPGUniversal/Exceptions/
RPGUniversal/Interfaces/
RPGUniversal/Interfaces/RPGCharacter.class
RPGUniversal/Interfaces/RPGItem.class
RPGUniversal/Interfaces/RPGObject.class
RPGUniversal/Interfaces/Trackable.class
RPGUniversal/Interfaces/Tracker.class
RPGUniversal/Interfaces/RPGMapComponent.class
RPGUniversal/Interfaces/RPGMap.class
so far all good, next I delete the RPGUniversal directory leaving the only file in the current directory RPGUniversal.jar
next I create the RPGMap directory and give it the proper .java files and directory tree.
I then run a script to compile every .java file
for i in `find ./ -name "*.java"`; do javac "$i"; done
and I get a ton of dependancy errors:
exodist@Abydos:/stuff/JProject/test$ for i in `find ./ -name "*.java"`; do javac "$i"; done
./RPGMap/BaseClasses/StaticMap.java:13: package RPGUniversal.Interfaces does not exist
import RPGUniversal.Interfaces.*;
^
./RPGMap/BaseClasses/StaticMap.java:20: cannot resolve symbol
symbol : class RPGMap
location: class RPGMap.BaseClasses.StaticMap
public abstract class StaticMap implements RPGMap
^
./RPGMap/ComponentClasses/MapTile.java:9: package RPGUniversal.Interfaces does not exist
import RPGUniversal.Interfaces.*;
^
./RPGMap/ComponentClasses/MapTile.java:10: package RPGUniversal.ADTs does not exist
import RPGUniversal.ADTs.*;
^
./RPGMap/ComponentClasses/MapTile.java:16: cannot resolve symbol
symbol : class RPGObject
location: class RPGMap.ComponentClasses.MapTile
public class MapTile implements RPGObject
^
./RPGMap/ComponentClasses/MapTile.java:19: cannot resolve symbol
symbol : class RPGImage
location: class RPGMap.ComponentClasses.MapTile
private RPGImage MyImage;
^
./RPGMap/ComponentClasses/MapTile.java:31: cannot resolve symbol
symbol : class Coordinates
location: class RPGMap.ComponentClasses.MapTile
public boolean CheckForCollision(Coordinates C)
....the list goes on........
how do I tell it to look inside the RPGUniversal.jar file to find the required classes?
here is a directory tree so you can see how it is set up:
ls -R1
RPGMap/
RPGUniversal.jar
./RPGMap:
BaseClasses/
ComponentClasses/
ExternalInterfaces/
HigherClasses/
InternalInterfaces/
./RPGMap/BaseClasses:
StaticMap.java
./RPGMap/ComponentClasses:
MapTable.java
MapTile.java
TableList.java
TileSet.java
./RPGMap/ExternalInterfaces:
./RPGMap/HigherClasses:
DynamicMap.java
./RPGMap/InternalInterfaces:

The JAR file needs to be in the compliers classpath : javac -classpath "$CLASSPATH:RPGUniversal.jar" "$i"

How to modify a specific class in jar file ?

I've downloaded a jar file for applet, the jar file works fine... but when I extract a specific class file from the jar file and just recompie it from my IDE (Eclipse) without even making any change and then compress again jar class files including the new modified class file instead of the old one (without any modifications to other classes)... then I get
(NoSuchMethodError ) exception whenever methods of other classes are invoked from within the modified class !!
...The manifist file of the jar file reads the following line
Created-By: 1.4.0_01 (Sun Microsystems Inc.)
I thought it means that jar class files were built using JDK 1.4.0_01 ...I used JDK 1.5.0_01 in my IDE...
I thought JRE incompatiblity was the reason of the problem so I downloaded JRE 1.4.0_01 and used it to build this class file... but i got the same exception..
so what is the main reason of the problem ? ...should I make changes to IDX files accompanying applet jar files ??
If no, then how can I overcome this problem and be able to change and rebuild a specific class from this jar file ?
(I cannot rebuild all classes in jar because there are errors I cannot resolve !!)

Could you please clarify: do you want to run your project or a project from an independent jar?
In the first case just select Run Project from the project context menu or select a class with main method and click Run File in the class context menu.
Regarding the second case:
- I don't think there is such a feature in the IDE (running third party jars is not an IDE function). Could you explain why you need this?

How to package an application as a JAR file?

I want to package an executed JAR file,how to do?
"jar cvf jar_name class_name"? But it can't run,:( help me.
Thanks in advance.

Suppose your main class call MyMainClass. You need to create a file called "mymanifest". In the mymanifest file, you need to include following line:
Main-Class: MyMainClass
Then you need to jar your jarfiles by:
jar cvfm classes.jar mymanifest -C foo/ .
After this, you can run your jar file by java -jar classes.jar.

How can I reference more than one jar file

hi, In an applet, I use
Archive = "foo.jar" to reference this jar file.
But how can I reference more than one file?
Thanks.

Suggestion: spend a few minutes reading the tutorials.
http://java.sun.com/docs/books/tutorial/applet/appletsonly/html.html
You can specify multiple archive files by separating them with commas:
<APPLET CODE="myapplet.class" ARCHIVE="file1, file2" WIDTH=anInt HEIGHT=anInt>
</APPLET>

How to create package and import from jar file?

Hi all,
I am writing a software and I am not sure how to create a package for the classes.
Say I have two classes in the same directory as follows:
testA.java
==========
package AB;
public class testA
public static void main(String[] args){
     testB myB = new testB();
     System.out.println("A test");
testB.java
===========
package AB;
public class testB
public testB(){
     System.out.println("B constructor");
both file compile without the package heading;
both file compile using: javac -classpath .\ *.java
Question 1:
I cannot run testA by: java -classpath .\ testA
I think it is a syntax error. What is the correct one?
If I run testA by: java testA
The only output I get is: A test
But I am expecting: B constructor /n A test
What went wrong?
Question 2:
I need to use APIs of another software. I have downloaded a .jar file (xxx.jar) with all the classes in it. And I have put "import xxx.*;" in my source file. But the compiler complains about the importing. What is the right way to copmile it?
I have read a couple of tutorials but they don't answer my question.
(I am using windows2000 and don't have the classpath variable.)
Hope some one can help.
Thanks a lot

Try moving testA out of the package and importing 'AB.*;'
If you have:
./testA.class
./AB/testb.class
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How to add empty folder in a jar file ?

Well
I know how to add files in a jar file but I cannot add empty folder.
I would like to do this so that when I get back the jar file I can have all the structure of the save main folder.
I also test that it is possible to do that on line with the "jar" command.
Does any of you know how to do this programacticaly ?
Thanks in advance

     JarOutputStream jos = // ...
     jos.putNextEntry(new JarEntry("directory/"));
     jos.closeEntry();
     jos.finish();
     jos.close();on the command line:
jar -tf <your_jar_file.jar>

How to create a java card library (jar file to be used in other programs)

Hi all,
I am working on JCOP and writing quite a bit of applets for the java card . Now i have lots of code that could be reusable for example sending SMS, encryption routine, etc.. So this part of the code i want to put into a utility class and create a package out of it. This utility package i must be able to import into my programs what i write.
I tried the normal way of creating the jar by renaming the CAP file of the utility class, also tried including the /javacard/* files also into the jar file as indicated by sfarmer(active forum member here). But none seems to work. I tried contacting NXP folks and they indicated that it may be possible only by way of Sharable Objects.
But some how i am not convinced why i should use Sharable object for this. So if any one can throw some light into this regard it will be immensely helpful to me and my project.
Regards
Prakash

Hi,
Well the variable defined are as below
public static byte[] msgdata = new byte[255];
private static final byte[] HEADER_TEMPLATE = {
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               (byte) 0x82, (byte) 0x02, (byte) 0x81, (byte) 0x02, // Device Identities tag
               (byte) 0x8D, // Text String tag
               (byte) 0x00, // length
               (byte) 0x04, // Text String tag
the msgdata is declared public so that i can access this as a Class member in my other program doing Utilities.msgdata. But the problem is now that if i dont declare it as final then the compiler gives me the below error
"library has initialized array for non-final, non-static field Utilities, msgdata, [B, attr jc-field: tok 0, public static"
If i make it final then i cannot change it... So now i am stuck..
Any help will be highly appreciated...
Regards
Prakash

How to bundle java help class into jar file ?

Hi, all,
I have some package in my project, with which I have a java help jar file as classpath, when I run my project, I need the jh.jar file in directory /jar/jh.jar.
Now, I bundled all my class packages into a jar file, my.jar, together with the /jar directory. When i run my jar file with command:
java -jar my.jar
It tells me couldn't find javahelp class.
What shall I do? How can I create my jar file with the jh.jar?
Thanks in advance.

I think you'd be better off just adding the jh.jar as
a classpath argument and running it like that:
java -classpath /myjavalibdir/jh.jar -jar myjar.jar
...otherwise you're stepping into redistribution of
binary issues licensing-wise. That won't work either; when you run java with the -jar option, it ignores both the -classpath option and the CLASSPATH environment variable. However, it will see jh.jar automatically if you put it in the <path-to-java>/jre/lib/ext directory. But for distribution purposes, it might be simpler just to combime the contents of jh.jar into myjar.jar (if you use Ant, its <jar> task makes that very easy). Or, you can just run it this way:java -classpath myjar.jar;jar/jh.jar MyMainClassBTW, I don't think redistribution is a problem; otherwise how anyone even use JavaHelp?

How do I install a JAD & associated JAR file on a ...

Hi all,
I have a Nokia 6288 which I would like to install a signed application in the form of a signed JAD and accompanying JAR file.
I need the JAD because it is a signed application, and I need the phone to recognise this because the application accesses user data from the memory card.
I have tried:
1. Using PC Suite. It does not recognise JAD files.
2. Copying the signed JAD & the JAR file onto my memory card. The phone does not recognise JAD files. I can use the JAR file fine but it isn't fully functional.
3. Installing the JAD file from a WAP service by pointing my phones web browser directly to the JAD file online. It downloads and installs, but again, fails to be fully functional.
So at the moment I am stuck as although I can install the JAR by itself, the application is then not signed, and will not work because it cannot access the memory card.
Basically, how would I install a signed application (JAD & JAR) onto my Series 40 handset?

Since my last post I have been discussing this issue with commercial application developers and have been experimenting with various applications.
Firstly, let's make the JAR/JAD situation absolutely clear. Some, but not all, applications unquestionably require the JAD file as a part of the installation process. If the application is a "signed" application then the security authorisation is contained within the JAD file, not the JAR file. The JAD file is created from the JAR file and contains security verification information that is separate from the JAR file and which enables the application to signed as kosher.
The Nokia PC Suite Application Installer does not need to show you the JAD file. The JAR file is sufficient. If you install the application from a folder on your PC that contains both the matching JAR and JAD files then Application Installer will correctly install the application from both the JAR and JAD files. If the folder ONLY contains the JAR file then it will only install from the JAR file. I have proved this.
So, if you cannot get the application to work then the reason is not the installation process. The reason is far more likely to be that you are trying to install the application on a branded handset rather than on a standard Nokia handset. Some service providers heavily modify the base standard software that Nokia installs on its vanilla handsets and these modifications may well include changes to security authorisation rules that will prevent many applications working on handsets that they sell.
I am in dispute with one such as we speak. I will not name them right now but if I am unable to achieve a satisfactory outcome then be assured I will let EVERYONE know. Thank God for YouTube.

How to determine the path of the jar file cache of javawebstart?

Hello, I need to know how to determine where the java web start application
file jar cache is stored on windows system hard drive.
I would have launch of the inner processes
I have need to know the path of file jar .
example if my application is myAppliation.jar
in code generic class of myAppliation.jar i have the command runtime
String strCmd =
System.getProperties().getProperty("java.home") + "\\bin\\java" +
     " -cp " +
     System.getProperties().getProperty("java.class.path") + ";"
     + " anotherClass.class ";
Runtime.getRuntime().exec(strCmd);
the anotherClass.class has need
of the contained library in myAppliation.jar.

Thanks i have tried this metod and function
java.net.URL resource = classLoader.getResource("myResource");
if (resource != null) {
String s = resource.toString();
if (s.startsWith("jar:")) {
int index = s.indexOf("!");
if (index > 4) {
String fileurl = s.substring(4, index);
if (fileurl.startsWith("file:")) {
String path = fileurl.substring(5);
// now path is the path to the jar file in the cache containing the resource
System.out.println("file jar: "+path);
}

How to display a .jpg in a JAR file

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