Java InputStream 到 ByteBuffer
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Java InputStream to ByteBuffer
提问by elect
I am reading dds textures, but since once built the jar I can't access those textures through urland fileand have to use InputStreaminstead.
我正在阅读 dds 纹理，但是自从构建了 jar 后，我就无法通过这些纹理访问这些纹理url，file而必须InputStream改用。
So I would need to know how I can obtain a java.?nio.ByteBufferfrom an java.io.InputStream.
所以我需要知道如何java.?nio.ByteBuffer从java.io.InputStream.
Ps:no matter through 3rd part libraries, I just need it working
Ps：无论通过第 3 部分库，我只需要它工作
采纳答案by Jordi Castilla
For me the best in this case is Apache commons-ioto handle this and similar tasks.
对我来说，在这种情况下最好的是Apache commons-io来处理这个和类似的任务。
The IOUtilstype has a static method to read an InputStreamand return a byte[].
该IOUtils类型有一个静态方法来读取一个InputStream并返回一个byte[]。
InputStream is;
byte[] bytes = IOUtils.toByteArray(is);
Internally this creates a ByteArrayOutputStreamand copies the bytes to the output, then calls toByteArray().
这会在内部创建 aByteArrayOutputStream并将字节复制到输出，然后调用toByteArray().
UPDATE: as long as you have the byte array, as @Peterpointed, you have to convert to ByteBuffer
更新：只要你有byte array，正如@Peter指出的，你必须转换为ByteBuffer
ByteBuffer.wrap(bytes)
JAVA 9 UPDATE: as stated by @saka1029if you're using java 9+ you can use the default InputStreamAPI which now includes InputStream::readAllBytesfunction, so no external libraries needed
JAVA 9 更新：如@saka1029所述，如果您使用的是 java 9+，则可以使用InputStream现在包含InputStream::readAllBytes函数的默认API ，因此不需要外部库
InputStream is;
byte[] bytes = is.readAllBytes()
