解决方式
response.reset();
response.setContentType("application/octet-stream");
response.setCharacterEncoding("utf-8");
response.setContentLength(Integer.parseInt(documentManager.getFileSize()));
String title = documentManager.getFileName().concat(".").concat(documentManager.getFileType());
response.setHeader("Content-disposition", "attachment;filename=" + new String(title.getBytes("UTF-8"),"iso-8859-1"));
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