博客

一. File转byte[ ]

	File file = new File("xx");
	byte[] buf = null;
    try
    {
        FileInputStream fis = new FileInputStream(file );
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] byte = new byte[1024];
        int n;
        while ((n = fis.read(byte)) != -1)
        {
            bos.write(byte, 0, n);
        }
        fis.close();
        bos.close();
        buf = bos.toByteArray();
    }catch (FileNotFoundException e){
        e.printStackTrace();
    }catch (IOException e){
        e.printStackTrace();
    }
    return buf ;

一. File转byte[ ] 工具类

	import java.nio.file.Files;//Files引用
	File file = new File("xx");
	Files.readAllBytes(file.toPath());

二. byte[ ]转MultipartFile

public void wxUpload(@RequestBody byte[] bytes){
	InputStream inputStream = new ByteArrayInputStream(bytes);
	MultipartFile file = null;
	try {
        file = new MockMultipartFile("tmp.png" , "tmp.png" , ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);
          //MockMultipartFile方法介绍
        /**
        *  @param name 新文件名称
        *  @param originalFilename	源文件名称
        *	@param contentType 内容类型
        *  @param  contentStream  InputStream流
        */
        // MockMultipartFile(String name, @Nullable String originalFilename, @Nullable String contentType, InputStream contentStream);
        
    } catch (Exception e) {
        e.printStackTrace();
    }
}