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<TITLE>Writing Log Records to a Log File
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<B><A HREF="../java.util.logging/pkg.html">java.util.logging</A></B><font color="#666666" SIZE="-2">
[20 examples]
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<h3>
e391.
Writing Log Records to a Log File</h3>
To make a logger write log records to a file, you need to add a
file handler to the logger.
<pre>
try {
// Create a file handler that write log record to a file called my.log
FileHandler handler = new FileHandler(<font color="#0066ff"><i>"my.log"</i></font>);
// Add to the desired logger
Logger logger = Logger.getLogger(<font color="#0066ff"><i>"com.mycompany"</i></font>);
logger.addHandler(handler);
} catch (IOException e) {
}
</pre>
By default, a file handler overwrites the contents of the log file each
time it is created. This example creates a file handler that appends.
<pre>
try {
// Create an appending file handler
boolean append = true;
FileHandler handler = new FileHandler(<font color="#0066ff"><i>"my.log"</i></font>, append);
// Add to the desired logger
Logger logger = Logger.getLogger(<font color="#0066ff"><i>"com.mycompany"</i></font>);
logger.addHandler(handler);
} catch (IOException e) {
}
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Related Examples
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e385. <a class="eglink" href="BasicLogging.html?l=rel">
The Quintessential Logging Program
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e386. <a class="eglink" href="IsLog.html?l=rel">
Determining If a Message Will Be Logged
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e387. <a class="eglink" href="LogMethod.html?l=rel">
Logging a Method Call
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e388. <a class="eglink" href="LogExcept.html?l=rel">
Logging an Exception
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e389. <a class="eglink" href="Minimize.html?l=rel">
Minimizing the Impact of Logging Code
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e390. <a class="eglink" href="NoParent.html?l=rel">
Preventing a Logger from Forwarding Log Records to its Parent
</a>
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e392. <a class="eglink" href="LogConsole.html?l=rel">
Writing Log Records to Standard Error
</a>
<br>
e393. <a class="eglink" href="LogMemory.html?l=rel">
Writing Log Records Only After a Condition Occurs
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e394. <a class="eglink" href="SetFilter.html?l=rel">
Setting a Filter on a Logger Handler
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See also:
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Configuration">
Configuration
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<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#File%20Size">
File Size
</a>
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Formatters">
Formatters
</a>
<a class="eglink" href="/egs/java.util.logging/pkg.html?l=rel#Levels">
Levels
</a>
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