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(Java Developers Almanac Example)
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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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Related Examples
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e48. <a class="eglink" href="BasicApp.html?l=rel">
The Quintessential Java Application
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e49. <a class="eglink" href="Exit.html?l=rel">
Terminating the Application
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e50. <a class="eglink" href="ExitHook.html?l=rel">
Determining When the Application Is About to Exit
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e51. <a class="eglink" href="ElapsedTime.html?l=rel">
Computing Elapsed Time
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e52. <a class="eglink" href="LoadNative.html?l=rel">
Loading Native Code
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e53. <a class="eglink" href="Sortable.html?l=rel">
Implementing a Class That Can Be Sorted
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e55. <a class="eglink" href="GetHeapSize.html?l=rel">
Getting the Size of the Heap
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See also:
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Arrays">
Arrays
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Assertions">
Assertions
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Classes">
Classes
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Commands">
Commands
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Numbers">
Numbers
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Objects">
Objects
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Strings">
Strings
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#System%20Properties">
System Properties
</a>
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Threads">
Threads
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