Help java file manipulation.....

[jeffbroodwar]

Hi everyone,

Please help me accomplish the following :

1. how can i copy a file in java then paste it in a desired location

2. how can i run a .jar file run by just double clicking on it....

I need to know the answer asap... please reply asap... thanks.


Regards,
Jeff

[jeffbroodwar]

hey i found how to run the .jar by double clicking on it.... i noticed that there are 2 files that are recommended to open it.... Java(TM)2 SE Binary and Java(TM) SE Binary. i chose the Java(TM) SE Binary and it worked.... guess i need to clean my machine and try to make a clean install of Java. 1 down....how to copy and paste a file is left.... please help...

[r035198x]

Hi everyone,

Please help me accomplish the following :

1. how can i copy a file in java then paste it in a desired location

2. how can i run a .jar file run by just double clicking on it....

I need to know the answer asap... please reply asap... thanks.


Regards,
Jeff

To copy files, you must read the source file and write it to the destination file. You can use a BufferedInputSt ream and BufferedOutputS tream for that. N.B To move files, you can simply use the renameTo method in java.io.File class.

For number 2, read the jar file tutorial from sun.

[jeffbroodwar]

will this work if for example i want to put sample.war in c:\Jeffbroodwar folder from C:\ .I know this is gonna be spoon feeding... but can you help me with this, i mean can you give me a working code? cause i really need to finish this before i lose my job..... ^^; besides, i'm not that type....... i.e. if you dont mind r035198x Thanks,


Best Regards,
Jeff

[r035198x]

will this work if for example i want to put sample.war in c:\Jeffbroodwar folder from C:\ .I know this is gonna be spoon feeding... but can you help me with this, i mean can you give me a working code? cause i really need to finish this before i lose my job..... ^^; besides, i'm not that type....... i.e. if you dont mind r035198x Thanks,


Best Regards,
Jeff

If you don't want to lose your job you might as well start to write that program now. The code will just be about 15 or so lines anyway. Read the file from its current location and write it to the new location. It really is just as easy as that.

[jeffbroodwar]

ooow... a bit rude... thanks anyway. gudluck to me. ^^;

[JosAH]

Also note that if the file contains binary data (non-characters) it's better to use
streams instead of Readers and Writers; the latter apply character encoding and
deconding while streams read and write byte values as they are.

kind regards,

Jos

[r035198x]

ooow... a bit rude... thanks anyway. gudluck to me. ^^;

Remember that we are waiting here to see what you come up with. Don't make us wait too long. If you open the specs for those streams, this shouldn't take you 10 minutes.

[jeffbroodwar]

i was able to read the file and print its contents :


[CODE=java] //READ A FILE
try
{
FileInputStream fin = new FileInputStream ("SampleWebServ ice.war");
BufferedInputSt ream bin = new BufferedInputSt ream(fin);
int ch=0;
while((ch=bin.r ead())> -1)
{
StringBuffer buf = new StringBuffer();
buf.append((cha r)ch);
System.out.prin t(buf.toString( ));
saveVariable = String.valueOf( buf);
}

}
catch(IOExcepti on ex)
{
System.out.prin tln(ex.getMessa ge());
}[/CODE]


the only problem is how can i write it....to a new file....example putting it inside
the folder DestinationFold er...

hope you guys can help me...

Regards,
Jeff

[r035198x]

1.)Put the logic in a static method with the following signature
[CODE=java]public static void boolean(String fromPath, String toPath) {[/CODE]

2.) Use while [CODE=java]while(ch != -1) {[/CODE] what if the value read is 0?
3.)Close those streams after using them.

[jeffbroodwar]

how can i write it? i mean after placing it inside... where's my buffer output stream? i tried this code :

//WRITE FILE
try
{

FileOutputStrea m fos = new FileOutputStrea m("Sample.war") ;

BufferedOutputS tream bos = new BufferedOutputS tream(fos);

bos.write(Byte. parseByte(saveV ariable));


}
catch (Exception e)
{
System.out.prin tln("Exception: " + e);
}


errrr..... but it gave me 0 bytes when i tried to look at it in the directory. the original file is 6 bytes.....

[jeffbroodwar]

Please help me with this one... i can make a code that will put the files in its desired location later. what i need now is how to write a new file after reading the original one... and placing it in other directory / even just renaming the new file and placing it in the same directory

[JosAH]

Please help me with this one... i can make a code that will put the files in its desired location later. what i need now is how to write a new file after reading the original one... and placing it in other directory / even just renaming the new file and placing it in the same directory

properly close() your BufferedOutputS tream (it will close the FileOutputStrea m
for you too), when you're done with it.

kind regards,

Jos

[r035198x]

You can simply use

[CODE=java]
int val = bis.read();
while(val != -1) {
bos.write(val);
val = bis.read();
}[/CODE]
For the reading and writing.

[jeffbroodwar]

Still.... it creates 0kb file..... ^^; eheheh i know it's easy for you guys.... sorry. i'm still new in java i guess....