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<h1>The Java Developers Almanac 1.4</h1>
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<h3>e54. Redirecting Standard Output, and Error</h3>
This example replaces standard output and error with a print stream
that copies its output to both the console and to a file.
<pre> // All writes to this print stream are copied to two print streams
public class TeeStream extends PrintStream {
PrintStream out;
public TeeStream(PrintStream out1, PrintStream out2) {
super(out1);
this.out = out2;
}
public void write(byte buf[], int off, int len) {
try {
super.write(buf, off, len);
out.write(buf, off, len);
} catch (Exception e) {
}
}
public void flush() {
super.flush();
out.flush();
}
}
</pre>
Here's an example that uses the class:
<pre>
try {
// Tee standard output
PrintStream out = new PrintStream(new FileOutputStream(<font color="#0066ff"><i>"out.log"</i></font>));
PrintStream tee = new TeeStream(System.out, out);
System.setOut(tee);
// Tee standard error
PrintStream err = new PrintStream(new FileOutputStream(<font color="#0066ff"><i>"err.log"</i></font>));
tee = new TeeStream(System.err, err);
System.setErr(tee);
} catch (FileNotFoundException e) {
}
// Write to standard output and error and the log files
System.out.println(<font color="#0066ff"><i>"welcome"</i></font>);
System.err.println(<font color="#0066ff"><i>"error"</i></font>);
</pre>
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<b>Related Examples</b></font></td>
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See also:
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Arrays">
Arrays
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Assertions">
Assertions
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Classes">
Classes
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Commands">
Commands
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Numbers">
Numbers
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Objects">
Objects
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Strings">
Strings
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#System%20Properties">
System Properties
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Threads">
Threads
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