JAVA把InputStream 转 字节数组(byte[])

  byte[] bytes = IOUtils.toByteArray(inputStream);

   <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>