Explain Look for Local Ports?
Submitted by: AdministratorExample 11-1: Look for Local Ports
import java.net.*;
import java.io.*;
public class LocalPortScanner {
public static void main(String[] args) {
for (int port = 1; port <= 65535; port++)
{
try {
// the next line will fail and drop into the
catch block if there is already a server
running on the port//
ServerSocket server = new ServerSocket(port);
}
catch (IOException e) {
System.out.println("There is a server on port
" + port + ".");
} // end try
} // end for
}
}
Here's the output I got when running
LocalPortScanner on my NT workstation:
D:JAVAJNP2examples11>java LocalPortScanner
There is a server on port 135.
There is a server on port 1025.
There is a server on port 1026.
There is a server on port 1027.
There is a server on port 1028.
Submitted by: Administrator
import java.net.*;
import java.io.*;
public class LocalPortScanner {
public static void main(String[] args) {
for (int port = 1; port <= 65535; port++)
{
try {
// the next line will fail and drop into the
catch block if there is already a server
running on the port//
ServerSocket server = new ServerSocket(port);
}
catch (IOException e) {
System.out.println("There is a server on port
" + port + ".");
} // end try
} // end for
}
}
Here's the output I got when running
LocalPortScanner on my NT workstation:
D:JAVAJNP2examples11>java LocalPortScanner
There is a server on port 135.
There is a server on port 1025.
There is a server on port 1026.
There is a server on port 1027.
There is a server on port 1028.
Submitted by: Administrator
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