Knife4j 2. Solution to the problem of file control without selection when uploading x version files

Key points ：

1. File object usage usage RequestPart annotation
2. dataType = “MultipartFile”,dataTypeClass = MultipartFile.class

@PostMapping("/upload")
@Order(value = 2)
@ApiOperation(value = " A single file File Upload ")
@ApiImplicitParams(
        {
    
                @ApiImplicitParam(name = "file", value = " File object ", required = true,
                        dataType = "MultipartFile",dataTypeClass = MultipartFile.class)
        }
)
public ResultVO<String> uploadFile(@RequestPart MultipartFile file) {
    
    return fileService.upload(file);
}

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