byte数组(byte[])与MultipartFile相互转化

MultipartFile转化为byte数组

byte[] bytes= file.getBytes();

byte数组转化为MultipartFile

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.5</version>
        </dependency>

 <dependency>
                   <groupId>org.springframework</groupId>
                   <artifactId>spring-test</artifactId>
                   <version>RELEASE</version>
                </dependency>

        byte[] bytes = message.getPacket();
        InputStream inputStream = new ByteArrayInputStream(bytes);
        MultipartFile file = new MockMultipartFile(ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);