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| |
| <div class="section"> |
| <h2><a name="Log4j_IOStreams"></a>Log4j IOStreams</h2> |
| |
| <p> |
| The IOStreams component is a <a href="../log4j-api/index.html">Log4j API</a> extension that provides numerous |
| classes from |
| <a class="javadoc" href="http://docs.oracle.com/javase/6/docs/api/java/io/package-summary.html">java.io</a> |
| that can either write to a |
| <a href="../log4j-api/apidocs/org/apache/logging/log4j/Logger.html" class="javadoc">Logger</a> |
| while writing to another <tt>OutputStream</tt> or <tt>Writer</tt>, or the contents read by an |
| <tt>InputStream</tt> or <tt>Reader</tt> can be |
| <a class="externalLink" href="http://www.eaipatterns.com/WireTap.html">wiretapped</a> by a <tt>Logger</tt>. |
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| |
| <div class="section"> |
| <h2><a name="Requirements"></a>Requirements</h2> |
| |
| <p> |
| The Log4j IOStreams API extension requires the Log4j 2 API. This component was introduced in Log4j 2.1. |
| </p> |
| </div> |
| |
| <div class="section"> |
| <h2><a name="Usage"></a>Usage</h2> |
| |
| <p> |
| The main entry point for the IOStreams module is the builder class |
| <a href="apidocs/org/apache/logging/log4j/io/IoBuilder.html" class="javadoc">IoBuilder</a>, and in particular, |
| the <tt>IoBuilder.forLogger()</tt> methods. One primary usage of this API extension is for setting up |
| loggers in the JDBC API. For example: |
| </p> |
| |
| <div> |
| <pre class="prettyprint linenums"> |
| PrintWriter logger = IoBuilder.forLogger(DriverManager.class) |
| .setLevel(Level.DEBUG) |
| .buildPrintWriter(); |
| DriverManager.setLogWriter(logger); |
| </pre></div> |
| |
| <p> |
| Using the <tt>IoBuilder</tt> class, there are a few more options that can be set. In general, there are six |
| primary classes one can build from it: <tt>Reader</tt>, <tt>Writer</tt>, <tt>PrintWriter</tt>, |
| <tt>InputStream</tt>, <tt>OutputStream</tt>, and <tt>PrintStream</tt>. The input-oriented classes |
| are for wiretapping, and the output-oriented classes are for creating either an output class that solely outputs |
| its lines as log messages, or an output filter class that logs all lines output through it to its delegate |
| output class. |
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