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POHow to use java program to run command prompt commands?
 

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  1. POHow to use java program to run command prompt commands?
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    <p>this is my first time posting here, so I'm not really sure what to say/ask. Anyways, I am trying to make a simple java program that runs command prompt commands from the java program, mainly used for ping flood (ping flooding myself).</p> <p>Here is my current code</p> <pre><code>public class Core extends JFrame { JTextField ipTextField; int packets = 0; boolean running = false; public Core() { super("Fatique"); Container container = getContentPane(); JButton bAttack = new JButton("Start Attack"); JButton bStop = new JButton("Stop Attack"); JPanel jPanel = new JPanel(); container.setLayout(new FlowLayout()); ipTextField = new JTextField("IP Address", 30); container.add(ipTextField); bAttack.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String input = ipTextField.getText(); String[] value = input.split(":"); int amountOfPackets = Integer.parseInt(value[1]); exec("cmd /c" + input + " -t -n " + amountOfPackets); running = true; } }); bStop.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { stop(); } }); if(!running) { jPanel.add(bAttack); } else { jPanel.add(bStop); } add(jPanel); } public void exec(String cmd) { try { Process p = Runtime.getRuntime().exec(cmd); System.out.println(getOutput(p) + " - " + getPacketsSent()); } catch (IOException e) { e.printStackTrace(); } } public String getOutput(Process p) { String output = null; try { BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = null; while ((line = in.readLine()) != null) { output = line; packets++; } return output; } catch (IOException e) { System.err.println(e.getStackTrace()); } return null; } public int getPacketsSent() { return packets; } public void stop() { exec("cmd /c break"); running = false; } public static void main(String[] args) { Core c = new Core(); c.setSize(500, 300); c.setVisible(true); c.setResizable(false); c.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); c.setLocationRelativeTo(null); } </code></pre> <p>I'm quite new at java, so that might not do what I want it to do. What I want it to do is I enter an ip address in the textfield, and split it with ":", and after that the amount of packets, for instance</p> <pre><code>127.0.0.1:100 </code></pre> <p>Though now when I try to use that ip and packet amount, it returns "null - 0" (from exec method), and I'm not even sure if it did anything related to ping.</p> <p>What I am trying to accomplish is as I already said, ping flood myself, and then output whatever I get as response, though I have no idea if this code does anything even related to that, I mostly use logic when coding java.</p> <pre><code> public String getOutput(Process p) { String output = null; try { BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = null; while ((line = in.readLine()) != null) { output = line; packets++; } return output; } catch (IOException e) { System.err.println(e.getStackTrace()); } return null; } </code></pre> <p>Could someone explain me why my code code is not working how I want it to work? Please don't judge, as I already said, I'm quite new to java programming.</p> <p>EDIT: Here is a quick "informative" explanation of what I am trying to accomplish.</p> <ol> <li>I type in an ip address and how many packets I want to send. In this explanation, I am using localhost ip, and 5 packets. <img src="https://i.stack.imgur.com/xKXbl.png" alt="About to send 5 packets to localhost ip"></li> <li><p>I start the attack. At this part, I want the program to run cmd prompt command</p> <p>ping 127.0.0.1 -t -n 5</p> <p>127.0.0.1 being the ip that I put in the textfield in my program, and 5 is the amount of packets I put in the textfield.</p></li> <li><p>I started the attack, so this is what should happen in the command prompt: <img src="https://i.stack.imgur.com/SC3wz.png" alt="5 packets sent to locahost"></p> <p>The language is Finnish, but still the same thing.</p> <p>This is the basic explanation of what I am trying to accomplish, hopefully someone understood and can help/tell why my code is not working, or is working but not printing the proper lines in eclipse console.</p></li> </ol>
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    1. COTry printing the raw output of the process' input stream.
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    2. COStill null, though I probably didn't do what you told me to do. System.out.println(in.readLine()); That is what I tried, now it returns "null null - 1"
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