Ping a server jdk1.5

From WikiJava

Since JDK1.5, java.net.InetAddress.isReachable(int) can be used to check if a server is reachable or not.

This example shows how to perform a pseudo ping in Java

the article

isReachable() will use ICMP ECHO REQUESTs if the privilege can be obtained, otherwise it will try to establish a TCP connection on port 7 (Echo) of the destination host. But most Internet sites have disabled the service or blocked the requests (except some university web sites like the example above) .

ReachableTest.java

import java.io.*;
import java.net.*;
 
public class ReachableTest {
 public static void main(String args[]) {
     try {
       InetAddress address = InetAddress.getByName("web.mit.edu");
       System.out.println("Name: " + address.getHostName());
       System.out.println("Addr: " + address.getHostAddress());
       System.out.println("Reach: " + address.isReachable(3000));
     }
     catch (UnknownHostException e) {
       System.err.println("Unable to lookup web.mit.edu");
     }
     catch (IOException e) {
       System.err.println("Unable to reach web.mit.edu");
     }
   }
}

See Also

Ping a server, Real's Java How To

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