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POSafe Java Pinging
 

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    <p>I have a project that pings all computera on LAN network. First I used <code>InetAddress.isReachable()</code> but sometimes function returns that IP is not reachable() even if IP is reachable(tried with build in function on windows and IP was reachable) . Second i tried with this code:</p> <pre><code>Process proc = new ProcessBuilder("ping", host).start(); int exitValue = proc.waitFor(); System.out.println("Exit Value:" + exitValue); </code></pre> <p>But output is wrong. Then I googled a bit and find out this code:</p> <pre><code>import java.io.*; import java.util.*; public class JavaPingExampleProgram { public static void main(String args[]) throws IOException { // create the ping command as a list of strings JavaPingExampleProgram ping = new JavaPingExampleProgram(); List&lt;String&gt; commands = new ArrayList&lt;String&gt;(); commands.add("ping"); commands.add("-n"); commands.add("1"); commands.add("192.168.1.1"); ping.doCommand(commands); } public void doCommand(List&lt;String&gt; command) throws IOException { String s = null; ProcessBuilder pb = new ProcessBuilder(command); Process process = pb.start(); BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream())); BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream())); // read the output from the command System.out.println("Here is the standard output of the command:\n"); while ((s = stdInput.readLine()) != null) { System.out.println(s); } // read any errors from the attempted command System.out.println("Here is the standard error of the command (if any):\n"); while ((s = stdError.readLine()) != null) { System.out.println(s); } } } </code></pre> <p>This code worked fine but problem is when Windows is on other langauge you can't tell if address is reachable or not. Can you guys share with me a safe method how to ping IP addresses on LAN or VPN network. Thank you.</p>
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    1. COHow is your first snippet wrong? (apart that it could be modified to limit the count)
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    2. COProblem is langauge of OS. Let's say that language is German and you don't know German Language. You can't tell is address is reachable or not....
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    3. COThat should NOT matter, what matters is the return code! And the first extract does exactly that.
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