Runtime.exec()

i have some java codes in my "tempfile" like;

import java.awt.*; //giris cikis

import javax.swing.*;

public class ikitamsayitoplaSWA extends JApplet

{

int toplam;

public void init()

{

int sayi1,sayi2;

toplam=0;

//

sayi1=Integer.parseInt(JOptionPane.showInputDialog(" Bir tam sayi giriniz : "));

sayi2=Integer.parseInt(JOptionPane.showInputDialog(" Ikinci bir tam sayi giriniz : "));

toplam=sayi1+sayi2;

}

public void paint(Graphics g)

{

g.drawRect(15,10,270,20);

g.drawString("iki sayinin toplami : "+toplam,25,25);

}

}

and i want to compile these codes which in my "tempfile.txt" at runtime with runtime.exec() or another method. but i dont know how i can do it...

aDiGea at 2007-7-9 6:11:14 >

i am building these codes at runtime in my program. for example when user add a radibutton i am adding codes(applet code) for radiobutton in my "tempfile.txt". when user clicked "ok" i want to compile these codes whic is in my "tempfile.txt" and build an applet file.my program is building an applet. user building form and click "ok" then my program compile in "tempfile.txt" codes and create an applet file.

aDiGea at 2007-7-9 6:11:14 >

Arguably you shouldn't be writing something like this until you know more about Java yourself.

But anyway, if you want to compile a class, then put it in a file with the appropriate name (not "tempfile.txt") and then compile it with javac, just like you do when you compile a class yourself, but this time invoked from Runtime.exec. (If you're using an IDE now, then stop it and start using command line tools while you do this project.)

I believe there are ways to hack into the compiler and invoke it directly, not using Runtime.exec, and possibly with more flexibility re: filenames and the like. But that would be a lot more difficult than just following naming conventions.

By the way: be forewarned that if you let others write code, you're opening the door to letting others write malicious code. What are you going to do with these classes once they're compiled?

paulcwa at 2007-7-9 6:11:14 >

i think you didnt understand me clearly, may be it is my fault.. i need explain my problem. i am building a program with java. in my program users add some components on the form(not in java, in my program which is built with java). and when they add a component (radiobutton,checkbox,button) i am building a tempfile ("tempfile.txt") and write that components applet code. after b齣lding form i want to compile these codes in "tempfile.txt". i want to do this in my program which is built with java. and i just need this direction's java code

compile "tempfile.txt" which is located in c:\tempfile.txt

i think i can do it with runtime() method if you know another method which is better it is ok.

i wish you could understand clearly...

aDiGea at 2007-7-9 6:11:14 >

> i think you didnt understand me clearly, may be it is

> my fault.. i need explain my problem. i am building a

> program with java. in my program users add some

> components on the form(not in java, in my program

> which is built with java). and when they add a

> component (radiobutton,checkbox,button) i am building

> a tempfile ("tempfile.txt") and write that components

> applet code.

Yes. I understand that perfectly, and I'm telling you DON'T CALL THE FILE TEMPFILE.TXT.

The only part I don't get (which you haven't explained) is how exactly the user input is selected, interpreted, and converted to Java code.

But that doesn't effect my previous warning: BE CAREFUL ABOUT MALICIOUS CODE INJECTION.

> after b齣lding form i want to compile

> these codes in "tempfile.txt". i want to do this in

> my program which is built with java. and i just need

> this direction's java code

>

> compile "tempfile.txt" which is located in

> c:\tempfile.txt

>

> i think i can do it with runtime() method if you

> know another method which is better it is ok.

>

> i wish you could understand clearly...

I do understand clearly. The problem is that you don't seem to understand my answers.

What part of "don't call the file 'tempfile.txt', give it a name following Java standards, and then use Runtime.exec to invoke javac, the compiler" don't you understand?

paulcwa at 2007-7-9 6:11:14 >

> my problem is not about "tempfile.txt". i can change

> it, it is just a name. i just want to know that how

> can i compile some codes in my "anothername.txt"(it

> is ok, i think).

> > String[] cmd = {"cmd.exe" , "/c" ,"start"

> ,"vbMailer.vbs", email, accountNumber};

>

> Runtime rt =

> Runtime.getRuntime();

> Process proc = rt.exec(cmd);

> int exitVal = proc.waitFor()

> i just need these code's explain.my file is located

> in c:\ and how must i create a string.i dont know

> which parameters i have to use...

> [code]

> String[] cmd = {[u]i think i just need here[/u]};

>

> Runtime rt =

> Runtime.getRuntime();

> Process proc = rt.exec(cmd);

> int exitVal = proc.waitFor()

>

> Message was edited by:

> aDiGe

> was edited by:

>aDiGe

like this you mean?

String[] cmd = {"cmd.exe" , "/c" ,"javac" ,"myfilehere"};

Runtime rt = Runtime.getRuntime();

Process proc = rt.exec(cmd);

int exitVal = proc.waitFor()

kikemellya at 2007-7-21 17:26:13 >

> yes i think but it doesnt work:

> > String[] cmd = {"cmd.exe" , "/c" ,"javac"

> ,"c:\\myfile.txt"};

>

>

> does this code compile "myfile.txt".

>

> i tried but it doesnt work.......

Hint - try compiling a .java file!

What were the symptoms of 'it doesnt work' ?

sabre150a at 2007-7-21 17:26:13 >

ohhhh god!!! i am new on java and i have to admit that my english is not perfect, you can't understand that how it is difficult to explain and solve some problems. i want to write my whole code here, i dont have any error message it just doing nothing...

import java.awt.*;

import java.awt.event.*;

import java.io.IOException;

import javax.swing.*;

public class test extends JFrame implements ActionListener {

public test(){

JButton but=new JButton("click");

Container c=getContentPane();

c.setLayout(new FlowLayout());

but.addActionListener(this);

c.add(but);

}

public void actionPerformed(ActionEvent evt){

String[] cmd = {"cmd.exe" , "/c" ,"javac" ,"C:\\Documents and Settings\\All Users\\test\\exec.java"};

Runtime rt = Runtime.getRuntime();

try{

Process proc = rt.exec(cmd);

try{

int exitVal = proc.waitFor();}

catch(InterruptedException e){}}

catch(IOException e){}

}

public static void main(String[] args) {

test pen=new test();

pen.setSize(300,300);

pen.setVisible(true);

}

}

thanks for all interests.................

aDiGea at 2007-7-21 17:26:13 >