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Index ‹ java-programmer
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- 1
- Encryption & DecryptionHi all
I've been asked to look into the encryption and decryption of attachments
sent in emails. The specific scenario is as follows:
- a file is created
- the file is to be encrypted
- the file is attached to an email and sent to a recipient
- once received, the file should be decrypted
- the file is read
At first glance, I think I should be reading up on the JCA (Java
Cryptography Architecture) and use a public key encrypt and a private key to
decrypt. Is this right?
Are there any online implementations or tutorials that you would suggest I
read to learn more about this?
--
Rogue Chameleon...
- 2
- Array iteration question/*Can i calculate the page totals, column totals, and rowtotals in one pass
through the array instead of the three passes i have coded? I have already
added an outer for loop to combine the three seperate iterations into one
but it still loops through the array multiple times and i would like to have
it loop through only once*/
import java.io.*;
import java.util.*;
import java.text.NumberFormat;
class P3
{
static PrintWriter screen = new PrintWriter (System.out,true);
public static void main (String [] args) throws IOException
{
final int COLLEGES = 4;
final int GENDERS = 2;
final int LANGS = 4;
int langAccum, genderAccum, collegeAccum, totalAccum = 0;
float percentage;
StringTokenizer data;
File file = new File ("p3input.txt");
FileReader inputFile = new FileReader (file);
BufferedReader inFile = new BufferedReader(inputFile);
String [] languageNames = {"C++" , "Cobol" , "Java" , "VB"};
String [] collegeNames = {"CCSU", "ECSU", "SCSU", "WCSU"};
String [] genderNames = {"Male", "Female"};
int [][][] enrollment = new int[COLLEGES][GENDERS][LANGS];
NumberFormat percent = NumberFormat.getPercentInstance();
// load array with values from file
for (int college = 0; college < COLLEGES; college++)
{
data = new StringTokenizer (inFile.readLine());
for (int gender = 0; gender < GENDERS; gender++)
for (int lang = 0; lang < LANGS; lang++)
{
enrollment[college][gender][lang] = new Integer
(data.nextToken()).intValue();
totalAccum += enrollment[college][gender][lang];
}
}
screen.println ("\nStudent Enrollment Survey Results:\n");
// first iteration to calculate percentage by language
screen.println ("Language\tPercentage");
for (int lang = 0; lang < LANGS; lang++)
{
langAccum = 0;
for (int college = 0; college < COLLEGES; college++)
for (int gender = 0; gender < GENDERS; gender++)
langAccum += enrollment [college][gender][lang];
percentage = (float) langAccum / totalAccum;
screen.println(languageNames[lang] + "\t\t" + percent.format(percentage));
}
screen.println("\n");
// next iteration to calculate gender percentage
screen.println("Gender\t\tPercentage");
for (int gender = 0; gender < GENDERS; gender++)
{
genderAccum = 0;
for (int college = 0; college < COLLEGES; college++)
for (int lang = 0; lang < LANGS; lang++)
genderAccum += enrollment [college][gender][lang];
percentage = (float) genderAccum / totalAccum;
screen.println(genderNames[gender] + "\t\t" + percent.format(percentage));
}
screen.println("\n");
// last iteration to calculate college percentage
screen.println("Colleges\tPercentage");
for (int college = 0; college < COLLEGES; college++)
{
collegeAccum = 0;
for (int lang = 0; lang < LANGS; lang++)
for (int gender = 0; gender < GENDERS; gender++)
collegeAccum += enrollment [college][gender][lang];
percentage = (float) collegeAccum / totalAccum;
screen.println(collegeNames[college] + "\t\t" +
percent.format(percentage));
}
inputFile.close();
}
}
- 3
- 3
- Displaying error values with Struts Validator FrameworkHi,
I'm using the struts validator framework to validate an email address
in a form.
If the user enters an invalid email address (ie
invalidEmailAddress.com) I'd like to display the following error
message:-
"invalidEmailAddress.com is an invalid e-mail address"
However all I seem to be able to do with the validator framework is
output the following:-
"Email address is an invalid e-mail address"
with messageResources.properties and validator.xml set as follows:-
validator.xml:-
<form name="addressForm">
<field property="emailAddress"
depends="email">
<msg name="email" key="errors.email" />
<arg name="email" key="form.address.label.emailAddress" />
</field>
</form>
messageResources.properties:-
errors.email={0} is an invalid e-mail address.
form.address.label.emailAddress=Email address
I'm using <html:errors /> to output the error list in a jsp.
Is there any way to substitute the actual entered value into the
errors.email message using the struts validator framework? I know it
can be done in the validate() method of the ValidatorForm class but
it there method of simply using the validator framework?
Thanks in advance for your help.
smrimell.
- 4
- How Do I Configure a Tomcat Server for Production?Hello,
I am pretty new to Tomcat. I am wondering if there are any standard
configurations that need to be added/modified as part of a Production
deployment aside from database URLs and those types of values.
Currently, we have mostly the same configuration for Production as we
do for development.
As the load increases are there any obvious values that we should be
changing?
Thanks, Jesse
- 8
- Design question: business delegate or not?L.S.,
We're in the process of developing an application using JSF, Hibernate and Spring and we're facing a design question on which we would like your ideas.
The application has it's own database, which is accessed using Hibernate, for most of it's entities (e.g. Problem), but it also has to work with data from a legacy system.
The legacy data is accessed through a set of Spring components (<bean/>s), which use JMS to exchange XML messages with the legacy system. These services provide us with e.g. Article instances.
The Problem instances, which are retrieved using Hibernate, should hold a reference to an Article. Since Hibernate does not know about the Article class, we have added an articleId property to the Problem class and whenever we retrieve a Problem using our ProblemService class, the ProblemService will look at this property and retrieves the corresponding Article instance.
This process happens for a couple of entities (Article, Supplier, TracingInformation, ...)
This approach however has a number of drawbacks:
1) our Problem class contains several 'duplicate' properties: articleId/article, supplierId/supplier,... leading to confusion
2) resolving the correct Article, Supplier, ... instances happens for every Problem ever instantiated in the ProblemService, causing overhead whever the information is not required by the JSF web client (especially for lists of data)
3) whenever someone adds functionality to the ProblemService, we have to be careful to always fill in the missing entities when a new Problem instance is created
We have thought of two possible solutions so far:
1) creating a Hibernate UserType to convert the article id stored in the database to an Article instance and visa versa
- This approach would solve drawbacks 1 and 3, but doesn't help us much with drawback 2.
- There is another issue with this approach: we need Spring's ApplicationContext in our UserType (<type .../> declaration in Hibernate mapping), but this would require rebuilding the ApplicationContext or having some kind of singleton to obtain the ApplicationContext (it is now created by a web application listener) (unless there is a Spring way of doing this, e.g. using a TypeDefinitionBean)
2) creating a business delegate for the Problem class
- This would solve all drawbacks, since the business delegate could quite easily use the Spring components already available to retrieve an Article instance on the fly when needed
- The business delegate should only have to expose the article property and the object sent to our DAO should only contain the articleId
- The business delegate solve the resolving of the Article, Supplier, ... entities once and for all, so nobody can forget to add these to their newly created Problem instance
The 'Business Delegate' solution seems the most appropriate, but wouldn't it add a considerable amount of extra coding for the features it provides?
Which solution would you recommend? Do you see an easier solution for the problem?
Thank you in advance for any feedback,
Gert Vanthienen
email***@***.com
- 9
- Accessing a Java COM component from .NET.NET framework 1.2
Hello.
We've been accessing a Java COM component from classic ASP for a while now,
which works fine. We now need to access it from .NET, but we have no idea
how to reference this component as we can't find the .dll (or whatever type
of file Java COM components compile to). We do know a couple of things
about the component:
CLSID: {E7DEFE93-E26E-11d2-B3A0-0000E8512796}
Component name: PaymentClient.com.COMClient
Searching the registry for either string yields results, but the only DLL
referenced is msjava.dll which is obviously not what we're looking for.
Can someone give us any hints on how to access this object from .NET.
Thanks,
Mike
- 9
- Focusing a JPanel?Is there a way to give a JPanel focus on a mouse click besides explicitly
saying "panel.requestFocus()"? I tried "panel.setFocusable(true)", but it
had no discernable effect. Using J2SE 1.4.2.
--
Ryan Stewart, A1C USAF
805 CSPTS/SCBE
- 10
- Export ApplicationHello.
I am using Netbeans 3.5 IDE and have created several applications which is
fine and dandy. The only thing I cannot do is work out how to export these
apps to another PC i.e. to run them on a machine without having the IDE
installed. I believe this would be via a JAR file but cannot seem to get
these to work. Any help in this area would be great as I am going round in
circles. Also, how do I encrypt the code ?
Regards
Stephen Gray
(Apologies if this is the wrong forum)
- 11
- Eclipse Runtime ErrorI am running Eclipse 3.1.1. I created a project, called PizzaShop.
Inside pizza shop, I have src\ lib\ and build\classes\ folders. Inside
src\, I have a pizza folder for the pizza package. That too is mirrored
in build\classes\pizza.
When I go to debug as ->debug, Eclipse tells me:
java.lang.NoClassDefFoundError: pizza/SystemTest
Exception in thread "main"
What does that mean and how do you tell Eclipse which main to run? I
think I tell it that when it pops open the configuration menu, and I
tell it "pizza.TakeOrder" for the main class to run. But, obviously, it
cannot find the main, and there is a public main() in the TakeOrder
file.
So confused, Scott
- 12
- Java server accessI have a javaApplet that needs to access a directory on the server, list
the files in directory, then access the selected file. My first idea
was to use a servlet on the server then I found out that the server that
this needs to work with doesn't support servlets or Tomcat. The server
supports PHP and CGI and the hosting company does not want to add java
support.
Can anyone give me an idea on how to go about this?
David Miller
- 12
- adjusting boundries of JPanels in JPanel in JFrameHi, I tried searching through the google groups, but am obviously using the
wrong search words.
I have a JFrame with a JPanel in it. The JPanel is using the following
layout:
new BoxLayout (parentPanel, BoxLayout.LINE_AXIS)
Then I added two JPanels to the parentPanel.
But then I would like to click and drag the separator between the two panels
to change the size of the two JPanels.
Any hints?
Thanks,
Novice
- 15
- 16
- identical JPanels, repetitive
I need to make a tabbed pane with four tabs, each pane shows text and
images from a List<Room> collection.
I can manually create the four tabs from the netbeans GUI builder, and
maybe use some copy paste so that the four tabs are similar if not
identical.
Staying within the GUI builder, how would four identical JPanel's, which
make up the tabs for a JTabbedPane, get created?
Could I somehow make a JList show as tabs?
thanks,
Thufir
- 16
- Suspending threads by ThreadPoolExecutorHi all,
Does ThreadPoolExecutor may suspend idle threads ?
I wonder wether suspended threads eat less resources than active ?
I imagine the solution when ThreadPoolExecutore suspends each idle
threat after idleness of 60 seconds and after next 60 seconds of being
suspend the thread got killed ?
Is it reasonable ?
Regards,
Maciej
|
| Author |
Message |
webuser
|
 Posted: 2003-12-23 6:45:00 |
Top |
java-programmer, command line memory profiler tool
Hello,
I'm looking for a simple command line tool (no windows) to help find a
memory leak in a large amount of old java code. Need to keep the test
machine identical to the production box, which is without xwindows.
Thanks for your help,
Erik
|
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| |
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Joe Fischer
|
| Posted: 2003-12-23 8:54:00 |
Top |
java-programmer >> command line memory profiler tool
On 22 Dec 2003 14:45:09 -0800, email***@***.com (Erik) wrote:
>Hello,
>
>I'm looking for a simple command line tool (no windows) to help find a
>memory leak in a large amount of old java code. Need to keep the test
>machine identical to the production box, which is without xwindows.
>
>Thanks for your help,
>Erik
You could try the -Xrunhprof option on the java command that
you use to run the Java application. This is documented at
http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/java.html ; you
can also run java -Xrunhprof:help at the command prompt. The dump is
not very easy to read. There are some other tools that try to
summarize the data. I've tried a couple from IBM and HP (I don't have
the URLs handy). They are AWT/Swing, though.
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Index ‹ java-programmer |
- Next
- 1
- Learning ArraysHi, I am just learning arrays and I am trying to get this 2D array to print
out like this:
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6
but insteads it prints out like this: 0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 1 2 3 4
5 6 0 1 2 3 4 5 6 0 1 2 3 4 5 6
I can get it to work with system.out.println but I need to use a
JOptionPane.showMessageDialog box as I have attempted to do. Any ideas?
(my code is below) Thanks!!!!!!!!!!
import javax.swing.*;
public class array5by7{
public static void main (String args[]){
String outputString = "";
int table[][] = new int [5][7];
for (int row=0; row<table.length; row++)
{
for (int col = 0; col <table[row].length; col++)
table[row][col] = 0 + col;
}
for (int row=0; row<table.length; row++)
{
for (int col = 0; col<table[row].length; col++)
outputString += (table[row][col] + " ");
}
JOptionPane.showMessageDialog (null, outputString + "\n");
}
}
- 2
- Problem with deploytool.I am trying to build a web service starting from hand-written wsdl using
JAX-RPC and wscompile tool from Sun Java System Application Server 8.0.
I don't want any data binding, so i invoke wscompile tool with -f
nodatabinding option with deploytool I create war, and I try to deploy it.
And deployment fails!
Reading server log I have found that reason for this failure is ejbc:
[#|2004-09-29T21:09:41.174+0200|INFO|sun-appserver-pe8.0.0_01|javax.enterprise.system.stream.out|_ThreadID=11;|
error: [failed to localize] unable to find member rodzajProblemu in
jaxrpcmapping meta for exception whose wsdl message is:
{http://www.eAdministracja.gov.pl/wsdl/ZDGUsluga}problemPrzetwarzania|#]
Message refers to part of my schema cited below:
<schema
xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:ug="http://www.eAdministracja.gov.pl/UrzadGminy/typy"
targetNamespace="http://www.eAdministracja.gov.pl/UrzadGminy/typy">
<complexType name="ProblemPrzetwarzania">
<sequence>
<element name="rodzajProblemu">
<simpleType>
<restriction base="string">
<enumeration value="Merytoryczny"/>
<enumeration value="Systemowy"/>
</restriction>
</simpleType>
</element>
<element name="oznaczenieProblemu" minOccurs="0" type="string"/>
<element name="opisProblemu" type="string"/>
</sequence>
</complexType>
<element name="problemPrzetwarzania" type="ug:ProblemPrzetwarzania"/>
</schema>
Identifiers are polish words, so don't bother with making up what do
they mean.
I have checked mapping.xml generated by wscompile, and ejbc is right -
there is nothing about rodzajProblemu, but if there is no class bound to
element problemPrzetwarzania except SOAPElement, there is no mapping,
so deploytool shouldn't try to compile any bean!
Should I consider it to be bug or I am doing sth. wrong?
- 3
- cannot start application server 8 ?installed the Sun Java System Application Server 8 recently. I run the
"asadmin start-domain --verbose domain1" command to try to start it,
however, it didn't happen. i'm using windows 2k server SP$.
thank's!
--
AbdelHalim MIMOUNI
- 4
- web browser plugin problem .... JRE not found?Hello,
I'm trying to load a Java 1.2 applet into IE 5 using the browser plugin.
When I do so, I get an error message telling me that the plugin cannot find
the JRE where in the path specified (ie., the path to which I just installed
the plugin).
What's going on here?
TIA,
- Boyd S.
- 5
- help with image display gui
hi wondered if anyone can help i want to create a dummy gui which looks
like a media player eg transition window buttons etc and have created
them as jpeg can someone help me in understanding how to inport them
into jframes etc and place there positions on the grid,
can gridbag place static images.is there any tutorials to do?
- 6
- javakeyHey Im in a spot of bother I have set the path in my windows xp to point to
java bin dir. and can run javac, but when ever I go to run javakey i gives
me "javakey" is not recognised as an internal or external command....
Im trying to sign some applets so they can open a network connection to
another computer. Im not 100% sure on how to do this or how difficult it
is, so any help would really be greatfully recieved.
Thanking you
niall
- 7
- 8
- GUI Object DesignI am pretty new to Java and I am trying to get my hands around OOD.
In the course of designing a GUI, I am working on breaking down the
components into the necessary objects so that the code will be as
versatile as possible.
As I work through it though, I am confronted with the situation where
I feel that I am over analyzing and creating too many objects.
Let's say that I have a pretty basic window application. It has a
window with a menu bar and three menus, each with a few items.
The main window is an object inherited from JFrame.
Is it best to make the menu a seperate object, inherited from
JMenuBar, and then make each menu a seperate object, inherited from
JMenu, and then make each menu item a seperate object, inherited from
JMenuItem? Or, is a lot of this typically placed within a single,
larger object?
I guess I am wondering where you draw the line. How do I know when I
have gone too far and am creating too many objects unnecessarily?
I imagine a lot of this dicussion is personal preference and some
aspects are open to debate. I am just looking for some guidance as I
learn more about this.
Thanks.
- 9
- Java Applet Parameter LimitHi all,
I would like to know the maximum number of parameters that can be passed
to an applet. While I think there is no theoretical maximum, I believe
there to be a practical limitation for browsers.
I am using winXP, IE6 and firefox1, and jre1.4.2.
I have a graphing applet which works very well except when there are a
large number of parameters i.e. 5000. When I load such an example with
appletviewer the applet opens fine. However when I load the same applet
in either IE6 or firefox1 then nothing happens except the page appears
to be loading but gets no where even if you leave it for hours - in
other words the browsers seem to hang. Java does not appear to load into
memory - the icon does not appear in the system tray which leads me to
believe that it is a browser limitation, rather than a java one.
Does anyone know if there is such a limitation? Do you think it could be
remedied by merging the tags - i.e. having less but longer params? Or is
there another way of passing data to the applet?
Many thanks,
Chris.
- 10
- Application for Nokia 3410 cell 'phone
This should be simple enough! I have a Nokia 3410. I have downloaded the
J2ME Wireless Toolkit. I would like to write some applications for the cell
'phone.
Now, I read that J2ME is a range of standards and applications, not a
platform. Fair enough.
Since this is in Java, I'd like to write my applications so that they run on
all cell 'phones - or all Nokia 'phones at least.
What I'd like to know is the following:
- What steps do I need to take to write and load a 'Hello World'application
into my 3410 and see it run?
If there is a document you can point me to, or a better newsgroup that would
be great!
Later on it would be nice to know how to advertise an cell 'phone
application so other people can download it and pay for it - but that can
wait until I have one fully written. For that I need to know the above!
--
"The pure and simple truth is rarely pure and never simple." - Oscar Wilde
- 11
- Poserpoint slide file (PPS) open with wired characters in jspI included a PPS file as a hyperlink in the jsp file that was
developed in Weblogic 8.1.4 on Windows 2000 platform. However, when I
clicked the file, it opened it with strange characters file contents.
The same file opened correctly under ASP format as a same hyperlink
file. I have never need to specify filetype in ASP. Search couple
hours on Web, could not find any clue, not even a topic talked about
similar subject. Can anyone help? Thanks.
C Chang
- 12
- 13
- Making Form results readableI have coded a simple form that sends the results to an email. The
form works, but when I recieve the data it is all together in one big
line. What kind of coding do I need to do to separate the data and
label it as well. Do I need to create some sort of template in
notepad??? I am a very beginner coder.
Thanks,
Lindsay
- 14
- Runtime.getRuntime().exec causing Windows 16-bit error!Hi there,
I'm trying to do something i've done many times before without problem, even
from signed applets...
trying to run a system command from Java.
I'm doing this:
import java.io.*;
public class SysCommand{
public static void main(Stirng[] args){
try{
Process proc =
Runtime.getRuntime().exec(
new String[]{"command.com",
"/C",
"echo",
"%windir%"});
BufferedReader reader =
new BufferedReader(
new InputStreamReader(
proc.getInputStream()));
System.out.println(reader.readLine());
proc.waitFor();
proc.destroy();
}
catch(Throwable th){
th.printStackTrace();
}
}
}
I'm trying to find out where the Windows directory is (i need to copy some
DLL's into there as part of an installation process).
When i run this, Windows raises a dialog box saying:
_______________________________________________________________
|16 bit MS-DOS Subsystem
|
|
|
| C:\WINNT\system32\ntvdm.exe
|
| Error while setting up environment for the application. Click 'Close'
to terminate |
---------------------------------------------------------------------------
---------
I'm running JDK 1.4.2_02 on a Win2K box.
Any ideas?
Thanks,
Paul
- 15
- How Robots Will Steal Your Jobgoose wrote:
> until AI people can give us something which does not need them to
> "pull the strings to set it into motion", then i think that they
> are only merely playing games.
I think that's the point of neural nets. You just develop a general
mechanism that "learns" from input--similar to how our brains do.
We aren't anywhere near achieving the complexity of the human brain,
yet, but we will get there eventually.
And THEN we'll see if true intelligence is an emergent property of
complexity (possibly) or whether it requires something more than
mere machinary (possibly).
Until then, we're all just guessing. (-:
> no, it only gets emotional when you accuse everyone on the group
> of species vanity. thus far you have twice told an agnostic that
> their "religion" is preventing them from recognising that others
> (creatures) have intelligence. good job!!
The irony is that I believe Mr. Green experienced what most
theologians would call a "conversion experience" (with dolphins)
and now, like many, many of the converted, is something of a
fanatic on the matter. His posts have more a sense of preaching
than of discussing, and--as you note--he is intolerant of the
"non-believers".
[shrug] Which is fine. Takes all types to make a world, and it's
good to have people on the Side of the Animals. As you can see
from the volume, the thread has certainly captured people's interest.
--
|_ CJSonnack <email***@***.com> _____________| How's my programming? |
|_ http://www.Sonnack.com/ ___________________| Call: 1-800-DEV-NULL |
|_____________________________________________|_______________________|
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