How to set the downloaded file name

Hello, I have question for changing the report name.

I was set the file name used by korean and special symbol such as &, _, @.

but It was not working. It seems like filtering to function in Crystalreport java file.

How do I resolve this issue?

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String downFileNm = "한국_제품&사용"

CrystalReportViewer crystalReportViewer = new CrystalReportViewer();

crystalReportViewer.setName(downFileNm);

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crystalReportViewer.getName(); // result -> ""