将Java InputStream的内容写入OutputStream的简便方法 [英] Easy way to write contents of a Java InputStream to an OutputStream

问题描述

我很惊讶今天发现我无法找到将 InputStream 的内容写入 OutputStream的任何简单方法。显然，字节缓冲区代码并不难写，但我怀疑我只是遗漏了一些会让我的生活更轻松（代码更清晰）的东西。





因此，在中给出 InputStream 和 OutputStream out ，是否有更简单的方法来编写以下内容？

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




解决方案

正如WMR所提到的，<$来自Apache的c $ c> org.apache.commons.io.IOUtils 有一个名为 copy（InputStream，OutputStream） 这正是您正在寻找的。

所以，你有：

  InputStream in; 
 OutputStream out; 
 IOUtils.copy（in，out）; 
 in.close（）; 
 out.close（）; 
  

...在您的代码中。

你有没有理由避免 IOUtils ？

I was surprised to find today that I couldn't track down any simple way to write the contents of an InputStream to an OutputStream in Java. Obviously, the byte buffer code isn't difficult to write, but I suspect I'm just missing something which would make my life easier (and the code clearer).

So, given an InputStream in and an OutputStream out, is there a simpler way to write the following?

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

解决方案

As WMR mentioned, org.apache.commons.io.IOUtils from Apache has a method called copy(InputStream,OutputStream) which does exactly what you're looking for.

So, you have:

InputStream in;
OutputStream out;
IOUtils.copy(in,out);
in.close();
out.close();

...in your code.

Is there a reason you're avoiding IOUtils?

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