root directory

[raghu9198]

Hi all,
MY NEW YEAR GREETINGS:)

I am writing code to search a file for that i need to display the path of the file where it is located
Take a look at my code
DeterminePath.java


import java.io.File.*;
import java.io.*;


public class DeterminePath
{
private static void dirlist(String fname)
{
File fileName = new File(fname);
String fName = fileName.getName();
String parentPath = fileName.getPath();
File parentDir = fileName.getParentFile();
String path = fileName.getAbsolutePath();
File[] root = fileName.listRoots();
String currentdir = System.getProperty("user.dir");
System.out.println("Original Filename = " + fName);
System.out.println("Parent Path = " + parentPath);
System.out.println("Parent Directory = " + parentDir);
System.out.println("Root Dir = " + path);
System.out.println("Currentdir = " + currentdir);
System.out.println("roots are :");
for (int i=0;i<root.length ;i++ )
{
System.out.println("root= " + root[i]);
}

}

public static void main(String args[])throws IOException
{
System.out.println("Enter FileName");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String fname = br.readLine();

dirlist(fname);
}
}


It is retrieving the path of the file DeterminePath.java but i need to retrieve the path of the file stored in the variable fname
how can i do this please help me on this regard
Thanks,
raghu

[mtyoung]

listRoots() is static method, File.listRoots() is ok

i suggest to get the root directory by File.listRoots()
and try to search all folder and compare the file names
after you match the file name and type, you create a File object and get its path

[Eranga]

How about the getAbsolutePath()

[raghu9198]

How about the getAbsolutePath()
__________________
What i did not understand?????

[Eranga]

Using that you can find the complete path of the specified file. That's what you want to find, if I'm correctly get you.

[raghu9198]

exactly!!!!!!
I want to do the same
And now I have one more issue
As I am developing a client server architecture I want run the program from the client on server capture the output and send it to the client
my code is working fine with the first part that is i am able to get the file from the client and then compile and run on server
Now i have to capture the output and send it to the client
how can i do that dynamically
i.e output of every program must be sent to the client
as far as my knowledge goes i am thinking of storing the output in a temp file and then send it to the client is it possible if so how
Please Don't mind i am very much confused as i am new to java

[mtyoung]

if you dont know the location of file, you cant create a correct File instant and getAbsolutePath()

[Eranga]

Yes it's true.

[mtyoung]

so... accounting to my suggestion in above, you may need to loop for all File.listRoots() to find out the file(s),
then create a correct File object

[raghu9198]

Thanks,

Thanks to this forum.Your answers are very much helpful to me
I am able get roots using File.listRoots
now i have another issue in front of me
i am trying to capture the output of a java program generated at the command prompt directly into a temp file for this i am using Dataoutputstream using this i can write the data into a file which is hard coded int the program but how to get the dynamically into the file
Please Help
thanks
raghu

[Eranga]

What you mean by hard coded int? What you want to write into the file?

[raghu9198]

Hi,
hard code in the sense i have directly given the text to be written in the file i.e everytime i run my code the text "hello sir"
will be written into the file but i need to write the text dynamically i.e ,the text generated at the command prompt has to be directly written into the file
Can I do that ???
Thanks,
raghu

[Eranga]

Yes you can. Using scanner read the text from the command prompt and write them into the text file.

[raghu9198]

Thanks,
Can't we do this without using scanner
Pardon my ignorance!!!!!!
i'm just curious to know is there any logic other than using scanner
Thanks,
raghu

[Eranga]

Other than scanner I don't know any way to read the command prompt.

[raghu9198]

ok
sir, thanks for spending your valuable time for me


Thanks
raghu

[mtyoung]

output of a java program generated

output of a java program generated?
is this java program code by you?
if yes, you can modify then program to output thing to System.out and fileWriter...

[raghu9198]

output of a java program generated?
is this java program code by you?
if yes, you can modify then program to output thing to System.out and fileWriter...

actually my code is

import java.io.*;

public class FileOutput
{

public static void main(String[] args)
{

FileOutputStream fos;
DataOutputStream dos;
try
{

File file= new File("D:\\file\\new1.java");
fos = new FileOutputStream(file);
dos=new DataOutputStream(fos);
dos.writeChars("\n Hello sir");

} catch (IOException e)
{
e.printStackTrace();
}

}

}
here i can write the string "Hello sir" into the file but i need to capture the output dynamically


thanks,
raghu

[raghu9198]

Dear Eranga,
As you said i have used scanner but it is not retrieving the file take a look at my code


import java.lang.Compiler;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;
class Server
{

public static void main(String[] args) throws Exception
{
Socket s;
ServerSocket ss=new ServerSocket(3000);
Thread mt;
while(true)
{
System.out.println("server is waiting....");
s=ss.accept();
System.out.println("Client is connected....");
mt=new Thread(new MyThread(s));
mt.start();
System.out.println("Thread started....");
}
}
}
class MyThread extends JFrame implements Runnable,ActionListener
{
Socket s;
Container c=getContentPane();
Container c1=getContentPane();
JLabel l1,l2;
JTextArea text1,text2;
JButton compile,execute;
InputStream is;
DataInputStream dis;
String fname,name;
File f;
FileOutputStream os;
MyThread(Socket s)
{
this.s=s;
}
public void run()
{
this.c1.setLayout(new FlowLayout());
l1 = new JLabel();
l1.setText("you have received a file:");
text1 = new JTextArea(2,20);
//save = new JButton("save");
compile = new JButton("compile");
execute = new JButton("execute");
c1.add(l1);
c1.add(text1);
//c1.add(save);
c1.add(compile);
c1.add(execute);
//save.addActionListener(this);
compile.addActionListener(this);
execute.addActionListener(this);
setSize(400,400);
setVisible(true);
setTitle("File Sharing");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
try
{
is=s.getInputStream();
dis=new DataInputStream(s.getInputStream());
fname=dis.readUTF();
text1.append(fname);
System.out.println("file name received");

// text1.replaceRange(" ",0,fname.length());
f=new File(fname);
name=f.getName();
System.out.println("file name "+name);
f=new File("d:/s/invoke/"+name);
os=new FileOutputStream(f);

int i;
while((i=is.read())!=-1)
{
os.write(i);
}


dis.close();
os.close();

}
catch (Exception e)
{
}
}
public void actionPerformed(ActionEvent ae)
{

if(ae.getActionCommand()=="compile")
{

try
{
String[] commands = {"cmd", "/c", "start", "compile.bat",name};
Runtime.getRuntime().exec(commands);

}
catch(Exception e)
{
System.out.println("Error");
}
System.out.println("compiled");

}
if(ae.getActionCommand()=="execute")
{
String ext =name.substring(0,name.indexOf("."));
System.out.println(ext);

try
{
String[] commands = {"cmd", "/c", "start", "execute.bat",ext};
Runtime.getRuntime().exec(commands);

Scanner sc =new Scanner(System.in);
String s=sc.next();
System.out.println(s);

}
catch(Exception e)
{
System.out.println("Error");
}
System.out.println("executed");
}
}
}


Thanks,
raghu

[mtyoung]

browsing the net, find this
When Runtime.exec() won't - JavaWorld

and you may read the following codes
program get the inputStream of process and output to System.out

public static void main(String args[])
	{
		try
		{
			String[] commands = {"rar", "a", "-agyyyymmdd_hhmm(a)", "-m5", "-msjpg", "f:\\T src"};
			
			Runtime rt = Runtime.getRuntime();
			Process proc = rt.exec(commands);
			InputStream stderr = proc.getInputStream();
			InputStreamReader isr = new InputStreamReader(stderr);
			BufferedReader br = new BufferedReader(isr);
			String line = null;
			System.out.println("<output>");
			while ((line = br.readLine()) != null)
				System.out.println(line);
			System.out.println("</output>");
			int exitVal = proc.waitFor();
			System.out.println("Process exitValue: " + exitVal);
		
		}
		catch (Exception e)
		{
			e.printStackTrace();
			System.out.println("Error");
		}
		System.out.println("compiled");
	}