'java.lang.System'
class provides setOut, setErr methods to redirect system output and error
messages.
Redirect
out stream messages to debug.log file
PrintStream
outStream = new PrintStream(new FileOutputStream("/Users/krishna/Documents/debug.log",
true));
System.setOut(outStream);
Redirect
err stream messages to error.log file
PrintStream
errStream = new PrintStream(new FileOutputStream("/Users/krishna/Documents/error.log",
true));
System.setErr(errStream);
App.java
package com.sample.app; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.PrintStream; public class App { public static void main(String args[]) throws FileNotFoundException { PrintStream outStream = new PrintStream( new FileOutputStream("/Users/krishna/Documents/debug.log", true)); PrintStream errStream = new PrintStream( new FileOutputStream("/Users/krishna/Documents/error.log", true)); System.setOut(outStream); System.setErr(errStream); System.out.println("Starting the application"); System.err.println("Error Occurred while executing the application"); System.out.println("Exiting the application"); } }
Run
App.java
Open debug.log,
you can see below messages.
Starting
the application
Exiting
the application
Open
error.log, you can see below messages.
Error Occurred
while executing the application
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