Im trying to implement digital signature on pdf using java applets. I have passed the required jars to the applet
<applet
width="1300"
height="900"
code="HelloWorld.class"
archive="bcpkix-jdk15on-1.47.jar,bcprov-ext-jdk15on-1.47.jar,itextpdf-5.3.5.jar">
</applet>
but failed to run on browser even though it works on applet viewer. When I add these jars in the /jre/lib/ext folder then it runs on the browser as well.
I can't place the jars on the specified folder as the applet runs on client's browser and wont be a good solution to place the jars on the pc of every client.
You cannot just add security providers without permission. You need to sign your code and have the user accept the applet to make changes to do that.
Related
Here's what I know:
When uploading files given by users, we should put them in a folder
outside the deployment folder. Let me call it D:\uploads.
We should (somehow) add that folder (D:\uploads) as a web app context.
Here's what I did:
I upload my files to the folder D:\uploads.
I tried adding the web app context as it's mentionned here by adding the following row to TOMCAT_DIR/conf/server.xml:
<Context docBase="D:\uploads" path="/uploads"/>
But that doesn't have any effect. When consulting http://localhost:8080/uploads/file.png or http://localhost:8080/uploads I get a HTTP Status 404 error.
So what I want to know:
What did I do wrong ? How can I add my upload folder to Tomcat?
Is there any better approach when it comes to uploading files ?
Because I'm wondering what should I change if I want to deploy my
application to another server where there's no D:\uploads.
Change the docBase attribute. Use D:/uploads (with slash) instead of D:\uploads (with backslash).
When dealing with files in Java, you can safely use / (slash, not backslash) on all platforms.
Regarding the differences you mentioned in the comments when starting the Tomcat from the IDE and from bin/startup.bat: It's very likely when you start the Tomcat from the IDE, it is not using the same context.xml your Tomcat is using. Just review the Tomcat settings in the IDE.
How to store uploaded files is a common topic at Stack Overflow. Just look around and you'll get surprised in how this topic is popular.
If you aren't happy enough in storing your files in D:/uploads or you'll have other servers accessing the files, you could consider storing them in some location in your network. Depending on your requirements, you can have one dedicated server to store your files or just share the folder which contains the files in your current server. The right decision will always depend on your requirements.
I currently have an application that runs from the desktop, but I would like to make it deployable from web browsers using JNLP. How do you go about setting up jnlp for an application? Are there any examples that go more in depth then a hello world?
So I ended up following this reference http://www.oracle.com/technetwork/articles/javase/jnlp-142088.html to build my jnlp. On a side note to add more jars etc all you need to do is list more jar tags and tag one as main. Use this to reference the structure and required tages https://docs.oracle.com/javase/tutorial/deployment/deploymentInDepth/jnlpFileSyntax.html#extension
I'm working on a website and right now I am using FileZilla to make changes to it. Every time I make a change, I have to re-upload the file to the website through FTP and then wait for it to update online. I want to just deploy my project to localhost so I can get instant results and then just upload the whole project when it's finished. How do I do this? All I have is a set of directories with the files in them.
You really need to use a web/application server such as IIS/Apache.
For PHP projects go for WampServer/XAMPP.Easy to setup and works very well.
(maybe too obvious)
If you are working only static content based on html/css/js you can just edit and view changes directly by opening the local file in your browser and refresh each time.
Furthermore for css and html you can edit your code "live", directly into browser and see changes immidiately.
Another option is to edit files with an editor that supports ftp like notepad++, you can connect via ftp, open and edit files directly from server (like php,html,css,js) because once you save the editor will automatically upload your changes.
Heres a good explanation about notepad++ and ftp plugin.
Localserver
If you work with php (and even only with html/css) the best choise is to run a local server that rappresents a real environment in which your code will run. As said by others XAMPP is a good choise for begginers because of simple installation and management.
XAMPP download
XAMPP tutorial
Once installed put your folder inside C:/xampp/htdocs/yourCodeFolder
Run the xampp control panel and start the Apache server.
Finally navigate with your browser to: http://localhost/yourCodeFolder/
I have a Java rich client desktop app. that I want to distribute on some computers at work, but I've never done something like this before. People aren't too computer-savy at my workplace and since it is a student job, I won't be there for much longer and I'd like it if I could make my program easy to run by making it runnable when people double-click on it.
I also don't want to have to manually install a JRE to have it run. Basically, what I'd like to know is how to make my java application runnable easily by double-clicking (even if it's only on windows, it's okay). I'm pretty sure I'm going to need to package the correct JRE version alongside, but I don't know what's the correct way of doing this.
I read on some sites that you should not package a JRE along with your program because it makes people have multiple different versions, some of which are outdated, and it causes security issues, but this is not a problem in this case since the computers that are going to run my application are not connected to the internet and are only used to run this program anyway.
Somewhat related question: Since my application is currently an Eclipse project, I get my resources such as icons, images, SQLite database (for read and write), etc. using relative paths (e.g.: img/test.png).
Am I going to have to change any of those paths to have them keep working even while packaged?
What you're looking for is a JAR file. In eclipse, it's quite easy to make a Jar file. Specifically, you'll want to right click on your project, go to Export, and then select "Runnable Jar." Be careful with paths to folders. You may need to keep a resources folder next to the Jar file. You may need to provide some more specifics to get an exact answer on that. Typically, a Resources folder is located in the same spot as the JAR file (in the same folder on your computer).
A better option for easy install of a Java app. with a GUI is to launch it using Java Web Start. For the user, JWS is the 'one click' installation option that can (install & launch the app. then) add desktop shortcuts and menu items. A JWS launch would mean some more work for you, but it is a breeze for the end user.
To ensure a suitable JRE is present to run the app., use deployJava.js (see the JWS link for more details). The script would need to be reconfigured to get the JRE installer from your local network - the default is to get it from Oracle.
Most of the resources should be packaged in Jar files and supplied along with the app., but for the DB, use the JNLP ExtensionInstallerService to call the DB installer.
..Java Web Start is kind of a link (or I can make it a shortcut on the desktop) that the users will click to either install the JRE and run the program if the JRE isn't installed, or just run the program if the JRE is present on the computer.
The way it would work is to have a web page on the local intranet. When the user visits the page, the script checks for a suitable JRE.
If it is present, it writes the link to the launch file.
If there is no JRE, or the version is too low, it will guide the user through installing it (just a matter of them clicking 'OK' when prompted). Then it will put the link to the app.
I can then configure the link to grab the JRE from the server on our network.
That's the part where you need to reconfigure the script. AFAIR the script exposes an URL at which to look for JREs - that can be changed to point to a place on the intranet.
..So "Web" is only just in the name, the computers don't have to be connected to the internet to have this work, right?
Yes. JWS is a great launch technology for Java rich clients, but is a poorly chosen name.
To make the problem run by double clicking it you can distribute it as a jar file or a batch file to call the jar file.
For the installation part you can make a batch file that checks if java is present and then call the installer if it isn't.
Edit:
The batch code:
IF DEFINED JAVA GOTO ok
java-installer.exe
GOTO end
:ok
your-application.jar
:end
If you are finding it tough to implement the above mentioned methods. You can proceed with this simple approach.
Create a folder lib at a location. Place all the jars that your application uses into this. If you are able to create a jar for your application, you can very well place your application.jar into the lib folder too. Create a batch file at the same location that will contain the java command for your main class in it. The text within your batch might look something similiar to this :
set path="\lib\"
java -cp %path% package1.package2.MainClass
If you have any other dependencies, for ex: if you use images in your code under img/icon.jpg. Then you just have to shift the img folder to this location too.
Just zip these files using winrar and share it across. Running the batch file after extracting the zip would launch your java MainClass irrespective of the location in which it is placed in the client system.
PS : If you are unable to create a jar for your application and placing it in lib folder, just copy your bin folder with class files and paste it in the location and change the batch file accordingly to look for classes inside bin.
I want to include the Application Loader process in a software installation, to ensure that users get our software installed on their Blackberry by the time our installer software finishes.
I know this is possible, because Aerize Card Loader (http://aerize.com/blackberry/software/loader/) does this. When you install their software, if your Blackberry is connected the Application Loader will come up and force the .COD file to install to the device.
I can't make it work. Looking at RIM's own documentation, I need to:
Place the ALX and COD files into a subfolder here: C:\Program Files\Common Files\Research In Motion\Shared\Applications\
Add a path to the ALX file in HKCU\Software\Research In Motion\Blackberry\Loader\Packages
Index the application, by executing this at the command line: loader.exe /index
Start the force load, by doing this: loader.exe /defaultUSB /forceload
When I execute that last command, the Application Loader comes up and says that all applications are up to date and nothing needs to be done.
If I execute loader.exe by double-clicking on it (or typing in the command with no parameters), I get the regular Application Loader wizard. It shows my program as listed, but un-checked. If I check it and click next, it will install to the Blackberry. (This is the part that I want to avoid, and that Aerize Card Loader's install process avoids.)
What am I missing? It appears that the Aerize installer is doing something different but I haven't been able to ascertain what.
You can do it easily with the following command:
C:\RIM\JDE_4.7.0\bin\JavaLoader.exe -u load <.cod file>
With this command you don't need an alx at all, just the cod file. Look at JavaLoader usage help to see full options.
JavaLoader.exe can upload one code file. What about two or more cod files?