java 在java中将StreamWriter转换为OutputStream？
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Convert a StreamWriter to an OutputStream in java?
提问by Yuval Adam
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?
我正在尝试使用 System.setOut 将 System.out 重定向到一个字符串，它需要一个 PrintStream。有什么方法可以将 StringWriter 转换为 Stream 以便我可以将其传递给 setOut？
回答by Yuval Adam
You can't do that exactly, since StringWriteris a Writer, not a Stream. But you can do this:
你不能完全那样做，因为StringWriter是 a Writer，而不是 a Stream。但是你可以这样做：
// 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();
