Howto: Change users password in Linux with Java

Question

Hi, how can i write a Java program to change user acounts passwords in linux?

Answer 1

this is how i solved the problem:
Runtime rt = Runtime.getRuntime();
        String[] callAndArgs = { "passwd",
                                 "--stdin",
                                 "ehi" };
        try {
            String line = null;
            Process child = rt.exec(callAndArgs);
            InputStream stdin = child.getInputStream();
            InputStreamReader isr = new InputStreamReader(stdin);
            BufferedReader br = new BufferedReader(isr);
            OutputStream os = child.getOutputStream();
            PrintWriter pw = new PrintWriter(os);
            pw.println ("empty");
            pw.flush();
            if ((line = br.readLine()) != null)
                           System.out.println(line);
            pw.println("password2");
            pw.flush();
            child.waitFor();
            System.out.println("Process exit code is: " + child.exitValue());
        catch(IOException e) {
            System.err.println(
                    "IOException starting process!");
        } catch (InterruptedException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }