尝试在JAVA中将数据写入多个工作表时，XLSX文件损坏

I'm new to JAVA. I have a requirement to load multiple files in a specific folder into an excel xlsx (not xls file because the input files have more than 65k records) file different sheets. Below is the code that I wrote. The xlsx file is getting corrupted, it is not opening. Can you please help?I'm new to JAVA. I have a requirement to load m