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POHow to extract IP addresses from a single long String in Java
 

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  1. POHow to extract IP addresses from a single long String in Java
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    <p>I am writing an android app to do a traceroute command.</p> <p>Right now when the traceroute executes it puts the console output into a very long single string. This is done by the following code:</p> <pre><code> public void runAsRoot(String[] cmds) throws Exception { Process p = Runtime.getRuntime().exec("su"); DataOutputStream os = new DataOutputStream(p.getOutputStream()); InputStream is = p.getInputStream(); for (String tmpCmd : cmds) { os.writeBytes(tmpCmd+"\n"); int readed = 0; byte[] buff = new byte[4096]; // if cmd requires an output // due to the blocking behaviour of read(...) boolean cmdRequiresAnOutput = true; if (cmdRequiresAnOutput) { while( is.available() &lt;= 0) { try { Thread.sleep(10000); } catch(Exception ex) {} //timeout.. gotta watch this carefully. } while( is.available() &gt; 0) { readed = is.read(buff); if ( readed &lt;= 0 ) break; String seg = new String(buff,0,readed); System.out.println("#&gt; "+seg); ListofIPs = seg; } } } os.writeBytes("exit\n"); os.flush(); } </code></pre> <p>The output of this strings looks like this: <img src="https://i.stack.imgur.com/XZMeg.png" alt="logcat output after printing the string"></p> <p>What I want to do is take this output and extract only the IP addresses and put them in order into an array. This is where I am at a loss of even where to begin. I'm thinking some type of String manipulation but don't know where to start.</p> <p>If anyone has any idea or pointers I would greatly appreciate it.</p> <p>Thanks in advance.</p>
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    1. USCheesegraterr
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    1. COLook at the `.split()` method of the `String` class.
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    2. COAre you familiar with regular expressions? If not, check here, it is just what you need: http://en.wikipedia.org/wiki/Regex
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    3. CORead line by line..use `.split(" ")` and second element would be IP address.
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      1. USShivam
 

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