java_network_programming_4th/src/LookupTask.java at master · cristobalc/java_network_programming_4th

26 lines (21 loc) · 589 Bytes

import java.net.*;

import java.util.concurrent.Callable;

public class LookupTask implements Callable<String> {

private String line;

public LookupTask(String line) {

this.line = line;

}

@Override

public String call() {

try {

// separate out the IP address

int index = line.indexOf(' ');

String address = line.substring(0, index);

String theRest = line.substring(index);

String hostname = InetAddress.getByName(address).getHostName();

return hostname + " " + theRest;

} catch (Exception ex) {

return line;

}

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