Java：如何将InputStream传递给标准输出？ [英] Java: How do I pipe InputStream to standard out?

问题描述

有一种简单（因此快速）的方法来实现这一目标吗？基本上只需要一些输入流，可能就像socket.getInputStream（），并让流的缓冲区自动重定向到标准输出？

Is there an easy (therefore quick) way to accomplish this? Basically just take some input stream, could be something like a socket.getInputStream(), and have the stream's buffer autmoatically redirect to standard out?

推荐答案

没有简单的方法可以做到这一点，因为 InputStream 有一个拉式接口，当 OutputStream 时有推式的。您需要某种抽取循环来从 InputStream 中提取数据并将它们推入 OutputStream 。像这样的东西（必要时在一个单独的线程中运行）：

There are no easy ways to do it, because InputStream has a pull-style interface, when OutputStream has a push-style one. You need some kind of pumping loop to pull data from InputStream and push them into OutputStream. Something like this (run it in a separate thread if necessary):

int size = 0;
byte[] buffer = new byte[1024];
while ((size = in.read(buffer)) != -1) out.write(buffer, 0, size);

它已经在Apache Commons IO中实现为 IOUtils.copy（）

It's already implemented in Apache Commons IO as IOUtils.copy()

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