46 lines
1.3 KiB
Java
46 lines
1.3 KiB
Java
// logging/SimpleFilter.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// {ErrorOutputExpected}
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import java.util.logging.*;
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public class SimpleFilter {
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private static Logger logger =
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Logger.getLogger("SimpleFilter");
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static class Duck {};
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static class Wombat {};
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static void sendLogMessages() {
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logger.log(Level.WARNING,
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"A duck in the house!", new Duck());
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logger.log(Level.WARNING,
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"A Wombat at large!", new Wombat());
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}
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public static void main(String[] args) {
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sendLogMessages();
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logger.setFilter(record -> {
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Object[] params =
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record.getParameters();
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if(params == null)
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return true; // No parameters
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if(record.getParameters()[0]
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instanceof Duck)
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return true; // Only log Ducks
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return false;
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});
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logger.info("After setting filter..");
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sendLogMessages();
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}
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}
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/* Output:
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___[ Error Output ]___
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Jul 22, 2016 11:55:55 AM SimpleFilter sendLogMessages
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WARNING: A duck in the house!
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Jul 22, 2016 11:55:55 AM SimpleFilter sendLogMessages
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WARNING: A Wombat at large!
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Jul 22, 2016 11:55:55 AM SimpleFilter main
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INFO: After setting filter..
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Jul 22, 2016 11:55:55 AM SimpleFilter sendLogMessages
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WARNING: A duck in the house!
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*/
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