在Java中将StreamWriter转换为OutputStream？ [英] Convert a StreamWriter to an OutputStream in java?

问题描述

我正在尝试使用System.setOut将System.out重定向到一个String，它接受一个PrintStream。有没有办法将StringWriter转换为Stream，以便我可以将它传递给setOut？

I am trying to redirect System.out into a String using System.setOut, which takes a PrintStream. Is there any way to convert a StringWriter into a Stream so that I can pass it to setOut?

推荐答案

你做不到确切地说，因为 StringWriter 是 Writer ，而不是 Stream 。但是你可以这样做：

You can't do that exactly, since StringWriter is a Writer, not a Stream. But you can do this:

// create a ByteArray stream, which will be wrapped by a PrintStream
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
System.setOut(ps);

// print whatever you got
String result = baos.toString();

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