I use the java.util.logging Logger class, and
I would like to capture all messages on the console (not just the logs) and put them in a string (that I use later elsewhere). I did find a class that captures the println-s from System.out, but the logs go to System.err so I have to include those as well somehow. I have tried to capture both of them, but I didn't find a way.
I also tried to use handlers but I couldn't figure them out.
How can I solve this problem? Is there a way to capture every console output into a single string?
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1sounds like an XY problem, what exactly are you trying to achieve by doing this? It might be that there is a solution for that, instead of a solution for the problem cause by the other problem.AlexT– AlexT2021-01-26 16:55:40 +00:00Commented Jan 26, 2021 at 16:55
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I have to put everything from the console into a json log file, and the class that creates it uses that string. Since then I was asked to let it go and now I am setting up Logback and slf4j. Thank you for your answer :)asd– asd2021-02-03 10:08:57 +00:00Commented Feb 3, 2021 at 10:08
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1 Answer
Use System.setOut(PrintStream ps) method, like in this example:
public class Main{
public static StringBuffer sb;
public static void main(String[] args) {
sb = new StringBuffer();
PrintStream console = System.out;
System.setOut(new PrintStream(new OutputStream() {
@Override
public void write(int b) throws IOException {
Main.sb.append((char)b);
}
}));
System.out.println("Hello World!!!");//Go to the StringBuffer
System.out.println("Hello World!!!");//Go to the StringBuffer
console.println("Output is:\n" + sb);
}
}
The output is:
Output is:
Hello World!!!
Hello World!!!
