Java InputStream到ByteBuffer [英] Java InputStream to ByteBuffer

问题描述

我正在阅读dds纹理，但是一旦构建了jar，我无法通过 url 和文件并且必须使用 InputStream 。

I am reading dds textures, but since once built the jar I can't access those textures through url and file and have to use InputStream instead.

所以我需要知道如何获得 java.nio.ByteBuffer 来自 java.io.InputStream 。

So I would need to know how I can obtain a java.​nio.ByteBuffer from an java.io.InputStream.

Ps：无论通过第三方库，我只需要它工作

Ps: no matter through 3rd part libraries, I just need it working

推荐答案

在这种情况下，我最好的是 Apache commons-io 来处理这个和类似的任务。

For me the best in this case is Apache commons-io to handle this and similar tasks.

IOUtils 类型有一个静态方法来读取 InputStream 和返回 byte [] 。

The IOUtils type has a static method to read an InputStream and return a byte[].

InputStream is;
byte[] bytes = IOUtils.toByteArray(is);

在内部创建 ByteArrayOutputStream 并复制字节到输出，然后调用 toByteArray（）。

Internally this creates a ByteArrayOutputStream and copies the bytes to the output, then calls toByteArray().

UPDATE ：只要你有字节数组，就像 @Peter 指出，你必须转换为 ByteBuffer

UPDATE: as long as you have the byte array, as @Peter pointed, you have to convert to ByteBuffer

ByteBuffer.wrap(bytes)

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JAVA 9更新：如所述@ saka1029 如果您使用的是java 9+，则可以使用默认的 InputStream API，现在包含 InputStream :: readAllBytes 函数，所以不需要外部库

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JAVA 9 UPDATE: as stated by @saka1029 if you're using java 9+ you can use the default InputStream API which now includes InputStream::readAllBytes function, so no external libraries needed

InputStream is;
byte[] bytes = is.readAllBytes()

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