Java

Re: CipherInputStream.read(byte[]) Dropping Final Block

3-Jun-13 17:05

See javadoc for CipherInputStream[^]

This method blocks until input data is available or end of stream is reached or an exception is thrown.

Keep this in mind. The last block is not decrypted and returned, until end of stream is reached. Circumventing this approach MAY LEAD TO DATA CORRUPTION!

Skippums4-Jun-13 4:47

Skippums

4-Jun-13 4:47

Sorry, I must be thick-headed, but I still don't understand. In my case, it seems (to me) that either:

1. Input data is available, or
2. The end of stream is reached

I am still not getting how neither of these is true, regardless of whether it is the final block or not. Can you elaborate on what exactly is happening that is making both of those conditions false? Thanks,

Sounds like somebody's got a case of the Mondays

-Jeff

Re: CipherInputStream.read(byte[]) Dropping Final Block

AlphaDeltaTheta4-Jun-13 5:30

Re: CipherInputStream.read(byte[]) Dropping Final Block

4-Jun-13 5:30

Lets Take an example of network streams,
If socket is not closed and no data is being sent, then stream.available() will return 0, but end of stream is not reached, so the final block is not returned. Similar case can be with memory streams...

Skippums4-Jun-13 6:33

Skippums

4-Jun-13 6:33

Ah, got it. I thought you were commenting on my specific example. So this comment was simply to caution me about specific cases that may break my proposed implementation, but does not explain why my example code in the original post is not returning the final block. Is this correct?

Sounds like somebody's got a case of the Mondays

-Jeff

Re: CipherInputStream.read(byte[]) Dropping Final Block

AlphaDeltaTheta4-Jun-13 6:41

4-Jun-13 6:41

Skippums wrote:
So this comment was simply to caution me about specific cases that may break my
proposed implementation

Yup, the comment was to caution you about the specific cases that may break your implementation.
But your example might also be related. I never tried in on my system!

New in Java

Garde33330-May-13 18:47

Garde333

30-May-13 18:47

I have just started Java I at the UoP and I am totally lost. How do we know what code to enter? Is there a code library? Please HELP! Confused | :confused:

Garde333

AlphaDeltaTheta30-May-13 20:42

30-May-13 20:42

Member 10085678 wrote:
How do we know what code to enter?

How can we say what code to enter... And what do you mean by this line... Doesn't make sense!

Garde33331-May-13 17:57

Garde333

31-May-13 17:57

OOPs! Sorry! I have no idea what that was.... What I meant to say was how do we know what code to enter? I see it like this, if I wanted to learn another language I would buy… for example a French dictionary to learn the words and make my own sentences. I am assuming Java is the same thing we must learn the language to make up our own code to create a program. For instance…
"int payment = salary + bonus " means create a number variable called "payment" I know this because I googled it. How or where do I go to learn these specific codes? How do I learn that I have to put “int” before a code to get a result? And so on? I feel totally lost any help will be greatly appreciated!
Thank you!

dusty_dex30-May-13 20:56

dusty_dex

30-May-13 20:56

If it's a Java course, then obviously you won't know until they teach it to you. Wink | ;)

Richard MacCutchan30-May-13 21:18

30-May-13 21:18

You could start here[^], but, I would assume you have a teacher who is going to explain things to you.

Use the best guess

Garde33331-May-13 17:45

Garde333

31-May-13 17:45

Hello thank you for your help….The thing is that I am taking classes online and you pretty much have to teach yourself by reading. This is the thing I have downloaded the JDK for Java and I have the NetBean running. However this is my question, how do we learn to code? For example if I wanted to know French I would get a French dictionary to learn what each word means and put my own sentences together. Since Java is a computer language how do I write my own code? Is there a library or some sort of Java dictionary that we (beginners) can use to make our own code (Java sentences)? LOL!

Thank you

Richard MacCutchan31-May-13 21:41

31-May-13 21:41

Well I already gave you the link to the Java tutorials, so you should work through them. They contain everything you need to learn the basics of Java programming.

Use the best guess

Pujara Jignesh2-Jun-13 0:12

Pujara Jignesh

2-Jun-13 0:12

Thanks , that was help full to me also. Smile | :)

Jignesh PH

Amarnath S30-May-13 21:43

Amarnath S

30-May-13 21:43

Look at this link ... Java[^]

jiyasharma18-Jun-13 1:48

jiyasharma

18-Jun-13 1:48

You are newbie in java so i want to suggest you a free online java course. The course is totally free. You can use this tutorial to learn at your own place.

https://www.udemy.com/java-basics-for-j2ee-and-android/?couponCode=techdisfree

in jsp

Swamy Kandi30-May-13 2:02

Swamy Kandi

30-May-13 2:02

how to get the select box's selected value of one jsp file in to another jsp file please suggest me with some code samples

Re: in jsp

Richard MacCutchan30-May-13 21:16

30-May-13 21:16

Your question is not clear. Try to explain in more detail.

Use the best guess

jsp form development

Swamy Kandi30-May-13 23:13

Swamy Kandi

30-May-13 23:13

i have 3 select drop down boxes in those,in first box i have to print the district names and in second box i have to print the perticular mondal list based on the first selection boxs district and in third box i have to print the village names that is based on the second select boxs result, and these values that is disrict,mondal and village names are in database table please suggest r explain in jsp

Re: jsp form development

Richard MacCutchan30-May-13 23:25

30-May-13 23:25

Without knowing the structure of your database or your application it's impossible to say more than: Read the first set of items and populate the first listbox. Then when an item is selected in the listbox use its content to read the next list in sequence and populate the next listbox. And do on as each listbox selection changes.

Use the best guess

Store Files in Stack

Sachin k Rajput 30-May-13 1:00

Sachin k Rajput

30-May-13 1:00

I'm receiving files on a TCP server.(one after another or multiple files one by one)
I want to use them in a LIFO order.
How can I store these files and use these files in java?

Re: Store Files in Stack

AlphaDeltaTheta30-May-13 20:39

Developing a Robust and Secure Online Payment System in Java EE

30-May-13 20:39

Store Reference to the files in a Stack/Array... Easy Peasy Big Grin | :-D

teknKAL28-May-13 1:03

teknKAL

28-May-13 1:03

I am an intermediate Java EE developer who wants to develop an online payment system that would work with either a bank or other online payment systems. My problem is because I am inexperienced in this area, the solution I have may not be robust and secure enough, I would like to know what are the issues I have to consider and if possible code samples with explanation to solving this problem.

Re: Developing a Robust and Secure Online Payment System in Java EE

Richard MacCutchan28-May-13 2:33

28-May-13 2:33

teknKAL wrote:
because I am inexperienced in this area, the solution I have may not be robust and secure enough

In which case it would not be a good solution. A much better idea whould be to use the interface from a commercial and professional payment gateway such as PayPal.

Use the best guess

about jsp

Swamy Kandi27-May-13 23:16

Swamy Kandi

27-May-13 23:16

i want to retrieve the database table values as the options of the select box in a jsp form

Re: about jsp

Richard MacCutchan28-May-13 0:21