BeanUtils.copyProperties(dict,excelDictDTO);

As an AI language model, I don't have the full context of your code, but I can explain what this line does in general.

This line of code uses the BeanUtils class from the Apache Commons library to copy the property values of one Java object (dict) to another Java object (excelDictDTO).

The copyProperties method of the BeanUtils class takes two parameters: the source object and the destination object. It then copies the property values from the source object to the destination object using reflection.

In this case, it is assumed that both the source and destination objects have properties with the same names and compatible data types. If there are any differences, the copy operation may fail or produce unexpected results.