|
Are you sure that you have copied the new servlet to the server correctly?
|
|
|
|
|
Hello friends,
I am new to Java having understanding of the basics. But, I have given a mini project to make the Login Frame on the eclipse platform and to verify the user login details and thereby showing his access rights on the other frame. I have to use Derby database for it.
I am really confused as I have to submit it in next 3 days
It would be kind if anyone can help me.
Thanks
|
|
|
|
|
It is unlikely that any response in this forum would be enough to help you, if you don't understand how to create a simple application such as you describe. For a start you will need to design your database and learn how to access it in Java; take a look at http://docs.oracle.com/javase/tutorial/jdbc/index.html[^]. As for the login screen, that is just a matter of adding a few labels, text boxes and buttons to a JFrame and accessing the information provided by the user. There are many useful samples in http://www.codeproject.com/KB/java/[^].
|
|
|
|
|
thnks Richard
|
|
|
|
|
What have you achieved so far?
The Eclipse IDE is a Eclipse RCP Application.
You can easily exchange the original login and build your thingy as a Eclipse RCP Plugin.
Lars Vogel has a lot of really good tutorials for you:
http://www.vogella.com/tutorials/EclipseRCP/article.html[^]
regards Torsten
I never finish anyth...
|
|
|
|
|
what is interface ?and why it is used?
|
|
|
|
|
|
|
Hello. I am implementing action event in a class 1, database handling in class 2 while all the controls are instantiated in a 3rd class. Heirarchy becomes like this.
class MyDatabase
{
}
class ActionHandler implements ActionListener
{
MyDatabase db = null;
View m_View = null;
public ActionHandler(View view)
{
m_View = view;
db = new MyDatabase();
}
public void actionPerformed(ActionEvent ae){
if(ae.getSource() == MyView.AddButton)
db.AddRecord();
}
}
class View
{
ActionHandler action_handler = null;
public View()
{
action_handler = new ActionHandler(this);
AddButton.addActionListener(action_handler);
}
}
Question is: how do I pass my JTextField values from View class to ActionHandler class ? I don't think passing these values in the constructor of ActionHandler is good idea.
|
|
|
|
|
You have a reference to the View object in your ActionHandler so you can access the view's properties and methods from there. Although I am not sure where MyView.AddButton fits in with the rest of your code.
|
|
|
|
|
YESSS. Thanks. One more question: along with View class object if I pass an object of MyDatabase in ActionListener constrcutor as well...like this
class ActionListenderHandler implements ActionListener
{
MyDatabse MyDB = null; View myView;
public ActionListenerHandler(View view, MyDatabase db)
{
myView = view;
MyDB = db;
}
}
class View
{
MyDatabase db = null;
public View()
{
db = new MyDatabase("...");
actionListener = new ActionListenerHandler(this, db)
db.CloseConnection();
}
}
After calling db.CloseConnection in View class, do I have to call myDB.CloseConnection in ActionListener class explicitly ? Thanks
|
|
|
|
|
No, because MyDB in the ActionListenderHandler and db in the View , both refer to the same object, just by different names, as shown by the line of code:
MyDB = db;
|
|
|
|
|
Hello
I am experimenting with java, I need a tutorial that will help me with creating rights,since different roles will not have access to same areas of the application.
Also what is the best way to encrypt passwords?
Looking forward to your replies.
Thanks
Act as though it were impossible to fail
|
|
|
|
|
Anele Ngqandu wrote: Also what is the best way to encrypt passwords?
You don't - you store a salted hash of the password.
Salted Password Hashing - Doing it Right[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
|
|
|
|
|
Thank you Sir
Act as though it were impossible to fail
|
|
|
|
|
Anele Ngqandu wrote: Also what is the best way to encrypt passwords? Just google for examples of encryption in java and you should find lots of examples.
Also, it is recommended that a password be hashed, as Richard mentions, and then store the hash but there are times where encryption is needed.
There are only 10 types of people in the world, those who understand binary and those who don't.
|
|
|
|
|
Act as though it were impossible to fail
|
|
|
|
|
RyanDev wrote: there are times where encryption is needed.
I can think of two, and "authenticating users" isn't one of them.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
|
|
|
|
|
what are those 2?
Act as though it were impossible to fail
|
|
|
|
|
- You need to store a password to access an external system or service;
- You're writing your own password manager, and need to be able to see the original password;
For the simple case of "validate that the user entered the correct password", encryption is only slightly better than plain text.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
|
|
|
|
|
Richard Deeming wrote: and "authenticating users" isn't one of them. Actually, I've had to do this before. I agree it is not ideal but when interfacing with other systems, sometimes you have to do it this way.
There are only 10 types of people in the world, those who understand binary and those who don't.
|
|
|
|
|
"Authenticating to a remote system" was one of the cases I was thinking of. I was just trying to keep it separate from "validating that the user entered the correct password".
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
|
|
|
|
|
Ahh I see!!Cool thank you
Act as though it were impossible to fail
|
|
|
|
|
Hi...i am very new to data mining,am working on web usage mining currently.can any one suggest me how do i preprocess the web server log file...i am using java programming language...
|
|
|
|
|