创建一个字节数组列表 [英] create an ArrayList of bytes

问题描述

我想将波形文件中的字节读入数组.由于读取的字节数取决于波形文件的大小，我正在创建一个最大大小为 1000000 的字节数组.但这会导致数组末尾出现空值.所以，我想创建一个动态增加的数组，我发现 ArrayList 是解决方案.但是 AudioInputStream 类的 read() 函数只将字节读取到字节数组中！如何将值传递到 ArrayList 中?

I want to read bytes from a wave file into an array. Since the number of bytes read depends upon the size of the wave file, I'm creating a byte array with a maximum size of 1000000. But this is resulting in empty values at the end of the array. So, I wanted to create a dynamically increasing array and I found that ArrayList is the solution. But the read() function of the AudioInputStream class reads bytes only into a byte array! How do I pass the values into an ArrayList instead?

推荐答案

你可以有一个字节数组，如:

You can have an array of byte like:

List<Byte> arrays = new ArrayList<Byte>();

将其转换回数组

Byte[] soundBytes = arrays.toArray(new Byte[arrays.size()]);

(然后，您必须编写一个转换器将Byte[] 转换为byte[]).

(Then, you will have to write a converter to transform Byte[] to byte[]).

您使用的是List错误，我将向您展示如何简单地使用读取AudioInputStreamByteArrayOutputStream.

You are using List<Byte> wrong, I'll just show you how to read AudioInputStream simply with ByteArrayOutputStream.

AudioInputStream ais = ....;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int read;

while((read = ais.read()) != -1) {
    baos.write(read);
}

byte[] soundBytes = baos.toByteArray();

PS 如果 frameSize 不等于 1，则抛出 IOException.因此使用字节缓冲区来读取数据，如下所示:

PS An IOException is thrown if frameSize is not equal to 1. Hence use a byte buffer to read data, like so:

AudioInputStream ais = ....;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int bytesRead = 0;

while((bytesRead = ais.read(buffer)) != -1) {
    baos.write(buffer, 0, bytesRead);
}

byte[] soundBytes = baos.toByteArray();

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