在 Java 中,如何将 InputStream 转换为字节数组 (byte[])?
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In Java, how can I convert an InputStream into a byte array (byte[])?
提问by Lee Warner
My background is .net, I'm fairly new to Java. I'm doing some work for our company's java team and the architect needs me to implement a method that takes an InputStream (java.io) object. In order to fulfill the method's purpose I need to convert that into a byte array. Is there an easy way to do this?
我的背景是 .net,我对 Java 还很陌生。我正在为我们公司的 Java 团队做一些工作,架构师需要我实现一个采用 InputStream (java.io) 对象的方法。为了实现该方法的目的,我需要将其转换为字节数组。是否有捷径可寻?
采纳答案by Jon Skeet
The simplest way is to create a new ByteArrayOutputStream
, copy the bytes to that, and then call toByteArray
:
最简单的方法是创建一个 new ByteArrayOutputStream
,将字节复制到那个,然后调用toByteArray
:
public static byte[] readFully(InputStream input) throws IOException
{
byte[] buffer = new byte[8192];
int bytesRead;
ByteArrayOutputStream output = new ByteArrayOutputStream();
while ((bytesRead = input.read(buffer)) != -1)
{
output.write(buffer, 0, bytesRead);
}
return output.toByteArray();
}
回答by tangens
A simple way would be to use org.apache.commons.io.IOUtils.toByteArray( inputStream )
, see apache commons io.
一个简单的方法是使用org.apache.commons.io.IOUtils.toByteArray( inputStream )
,请参阅apache commons io。