前言

字节是二进制数据的单位，1字节(Byte)=8位(bit)，byte数组一般用来处理文件流的操作

方式

InputStream is = new FileInputStream(new File("D://a.txt")); 
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int temp;
while ((temp = is.read(bytes)) != -1) {
     outputStream.write(bytes, 0, temp);
//转换后的byte[]
byte[] finalBytes = outputStream.toByteArray();

二、通过IOUtils

ObsObject obsObject = obsClient.getObject(bucketName, objectName);
        InputStream inputStream = obsObject.getObjectContent();
        byte[] bytes = null;
        try {
            bytes = IOUtils.toByteArray(inputStream);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            inputStream.close();
        return bytes;

这种方式更加快速 位于的包：package org.apache.commons.compress.utils;

场景

文件下载

  InputStream input = obsObject.getObjectContent();
        // 读取对象内容
        byte[] b = new byte[1024];
        OutputStream bos = response.getOutputStream();
        int len;