在 Java 中，如何将 InputStream 转换为字节数组 (byte[])?

2022-01-13 00:00:00 type-conversion java inputstream

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.有没有简单的方法可以做到这一点?

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?

推荐答案

最简单的方法是新建一个ByteArrayOutputStream，将字节复制到那个，然后调用toByteArray:

The simplest way is to create a new ByteArrayOutputStream, copy the bytes to that, and then call 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();
}

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