This program scan the local machine to identify available ports. Scanning range is 0-1024 and can be easily changed by giving the
startPort and/or
stopPort a new value.
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66 | import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.*;
import java.util.ArrayList;
import java.util.concurrent.TimeUnit;
import javax.swing.*;
public class PortScanner extends JFrame{
static JTextArea ta=null;
JScrollPane sp=null;
public PortScanner(){
super("Port Scanner");
setSize(400,400);
setLayout(new BorderLayout());
JButton b=new JButton("Start");
b.addActionListener(new ButtonHandler());
add("North",b);
ta=new JTextArea(20,20);
sp=new JScrollPane(ta);
add("Center",sp);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args){
new PortScanner();
}
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
int startPort=0;
int stopPort=1024; //49151 - 65536
CheckPort[] cp=new CheckPort[(stopPort+1)-startPort];
for(int i=startPort;i<=stopPort;i++){
cp[i]=new CheckPort(i);
cp[i].start();
}
}
}
class CheckPort extends Thread{
int curPort=0;
public CheckPort(int x){
curPort=x;
}
public void run(){
try{
Socket sok=new Socket("127.0.0.1",curPort);
PortScanner.ta.append("Port: "+curPort+" (in use)\n");
sleep(1000);
sok.close();
}catch(Exception e){
PortScanner.ta.append("Port: "+curPort+" (not in use)\n");
}
}
}
|
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