Redirect stdout to a string in Java

问题:

I know how to redirect the stdout to a file, but I have no idea on how to redirect it to a string.

回答1:

Yes - you can use a ByteArrayOutputStream:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
System.setOut(new PrintStream(baos));

Then you can get the string with baos.toString().

To specify encoding (and not rely on the one defined by the platform), use the PrintStream(stream, autoFlush, encoding) constructor, and baos.toString(encoding)

If you want to revert back to the original stream, use:

System.setOut(new PrintStream(new FileOutputStream(FileDescriptor.out)));