DEBUG] 10:32:41.060 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:54) - info created
[DEBUG] 10:32:41.061 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:60) - Params map created - 0 params
[DEBUG] 10:32:41.062 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:77) - boundary: 
------WebKitFormBoundarymsakWewAiHReUZRf
[DEBUG] 10:32:41.067 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:100) - skip first boundary
[DEBUG] 10:32:41.067 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:111) - Reading...
[DEBUG] 10:32:41.068 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:133) - Upload File info: FilePath=[null],fieldName=[testtime]
[DEBUG] 10:32:41.068 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:214) - Found a param, name=[testtime] value=[2020-06-04 10:25]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:133) - Upload File info: FilePath=[null],fieldName=[testresult]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:214) - Found a param, name=[testresult] value=[0]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:133) - Upload File info: FilePath=[null],fieldName=[rid]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:214) - Found a param, name=[rid] value=[92865,92866]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:133) - Upload File info: FilePath=[null],fieldName=[pic]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:214) - Found a param, name=[pic] value=[[object Object]]
[DEBUG] 10:32:41.069 org.nutz.mvc.upload.FastUploading.parse(FastUploading.java:231) - ...Done 459 bytes readed

上面这段日志是说明后台已经接收到pic文件参数了吧，但是

 @AdaptBy(type = UploadAdaptor.class)
    public Result testResult(String termialtype,String account,@Param("pic")File pic

我这个file文件确是空的，请问这是什么原因呢