java 将InputStream转换为字节数组

Posted 2021-05-08

  public static byte[] getBytes(InputStream is) throws IOException {
        if (null == is) {
            return null;
        }

        int len;
        int size = 1024;
        byte[] buf;
        if (is instanceof ByteArrayInputStream) {
            size = is.available();
            buf = new byte[size];
            is.read(buf, 0, size);
        } else {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            buf = new byte[size];
            while ((len = is.read(buf, 0, size)) != -1) {
                bos.write(buf, 0, len);
            }
            buf = bos.toByteArray();
        }
        return buf;
    }