Java:在System.setOut之后写入真正的STDOUT

Question

我试图拦截System.out和System.err,但保持在必要时直接写入原始流的能力.

PrintStream ps = System.out;
System.setOut(new MyMagicPrintStream());
ps.println("foo");

不幸的是,System类实现的细节意味着在我的例子中,"foo"被发送到真正的stdout的MyMagicPrintStream instread.有谁知道如何获得真实/原始OutputStreams的引用.

谢谢!

PS:否则会导致StackOverflowError < - 用于SEO.

Answer 1

试试这个:

PrintStream ps = new PrintStream(new FileOutputStream(FileDescriptor.out))

Answer 2

尝试这样的事情:

  PrintStream original = new PrintStream(System.out);

  // replace the System.out, here I redirect to NUL
  System.setOut(new PrintStream(new FileOutputStream("NUL:")));
  System.out.println("bar");  // no output

  // the original stream is still available 
  original.println("foo");  // output to stdout