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POChecking if a message contains a string
 

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  1. POChecking if a message contains a string
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    <p>I have have a class that check id a phrase is contained in a message, I tried to do it with <code>Matcher</code> and <code>Pattern</code> and with <code>String.contains()</code>, but the results returned are odd.</p> <p>Here is the class:</p> <pre><code>public class MotsClesFilter implements EmailFilter { final String NAME = "Filtrage par mots cles"; /*private Pattern chaineSpam; private Matcher chaineCourriel;*/ private int nbOccMotSpam; private byte confidenceLevel; @Override public String getFilterName() { return this.NAME; } @Override public byte checkSpam(MimeMessage message) { analyze(message); if(this.nbOccMotSpam==0) this.confidenceLevel = 1; else if (this.nbOccMotSpam&gt;0 &amp;&amp; this.nbOccMotSpam&lt;2) this.confidenceLevel = CANT_SAY; else if (this.nbOccMotSpam&gt;1 &amp;&amp; this.nbOccMotSpam&lt;3) this.confidenceLevel = 50; else if (this.nbOccMotSpam&gt;3 &amp;&amp; this.nbOccMotSpam&lt;4) this.confidenceLevel = 65; else if (this.nbOccMotSpam&gt;4 &amp;&amp; this.nbOccMotSpam&lt;5) this.confidenceLevel = 85; else this.confidenceLevel = 90; return (getConfidenceLevel()); } public void analyze(MimeMessage message){ try { List&lt;String&gt; listeChaines = new ArrayList&lt;String&gt;(); BufferedReader bis = new BufferedReader(new InputStreamReader(new FileInputStream(new File("SpamWords.txt")))); while(bis.ready()){ String ligne = bis.readLine(); listeChaines.add(ligne); } String mail = ((String.valueOf(message.getContent()))); //System.out.println(mail); for (int j =0; j&lt;listeChaines.size();j++){ //System.out.println(listeChaines.get(j)); Pattern chaineSpam = Pattern.compile(listeChaines.get(j),Pattern.CASE_INSENSITIVE); Matcher chaineCourriel = chaineSpam.matcher(mail); if (chaineCourriel.matches()) this.nbOccMotSpam++; } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (MessagingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public byte getConfidenceLevel() { // TODO Auto-generated method stub return this.confidenceLevel; } @Override public boolean enabled() { // TODO Auto-generated method stub return true; } } </code></pre> <p>The results returned by <code>checkSpam</code> are always 1 if use matches and 90 if I use find, it also returns 90 when I use <code>mail.contains(listeChaines.get(j))</code>.</p>
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    1. USuser2133558
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    1. COBoth methods are valid, you would have to be careful with Pattern and Matcher as you may have non regex compatible characters in the `String`. `Contains` is a better choice. Maybe add some logging and use a debugger to see what's going on. Also the usual idiom for reading from a `BufferedReader` is `if((line = reader.readLine()) != null`.
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      1. POChecking if a message contains a string
      1. USBoris the Spider
    2. COI'd recommend using `switch` statements instead of those `if` statements. Besides, there are two `if` statements that will never be true.
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      1. USLone nebula
    3. COwhich if are never true ? I tried contains but it works like find and it's not giving me the right results.
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      1. USuser2133558
 

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