Byte转MulitPartFile

1、POM导入

 <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>

2、代码部分

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

MultipartFile转化为byte数组

byte[] bytes= file.getBytes();