mavenの指定 <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.5-FINAL</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.5-FINAL</version> </dependency> 最新のApache POIを使います。 ExcelPage.html <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.or