官方介绍
HSSF is the POI Project's pure Java implementation of the Excel '97(-2007) file format. XSSF is the POI Project's pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.
从官方文档中了解到：POI提供的HSSF包用于操作 Excel '97(-2007)的.xls文件，而XSSF包则用于操作Excel2007之后的.xslx文件。
需要的jar包
POI官网上下载包并解压获取java操作excel文件必须的jar包：
其中dom4j-1.6.1.jar和xbean.jar（下载地址：http://mirror.bjtu.edu.cn/apache/xmlbeans/binaries/ 网站：http://xmlbeans.apache.org
并不包含在POI提供的jar包中，需要单独下载，否则程序会抛出异常：java.lang.ClassNotFoundException:org.apache.xmlbeans.XmlOptions。
具体代码
在Eclipse中创建一个java project，将上面列出来的jar包都加入到工程的classpath中，否则引用不到jar包会报错。
直接上代码（代码基本框架来自Apache POI官方网站，自行调整部分）：
创建excel文件并写入内容：
public static void createWorkbook() throws IOException { Workbook wb = new HSSFWorkbook(); String safeName1 = WorkbookUtil.createSafeSheetName("[O'sheet1]"); Sheet sheet1 = wb.createSheet(safeName1); CreationHelper createHelper = wb.getCreationHelper(); // Create a row and put some cells in it. Rows are 0 based. Row row = sheet1.createRow((short) 0); // Create a cell and put a value in it. Cell cell = row.createCell(0); cell.setCellValue(1234); // Or do it on one line. row.createCell(2).setCellValue( createHelper.createRichTextString("This is a string")); row.createCell(3).setCellValue(true); // we style the second cell as a date (and time). It is important to // create a new cell style from the workbook otherwise you can end up // modifying the built in style and effecting not only this cell but // other cells. CellStyle cellStyle = wb.createCellStyle(); cellStyle.setDataFormat(createHelper.createDataFormat().getFormat( "m/d/yy h:mm")); cell = row.createCell(1); cell.setCellValue(new Date()); cell.setCellStyle(cellStyle); // you can also set date as java.util.Calendar CellStyle cellStyle1 = wb.createCellStyle(); cellStyle1.setDataFormat(createHelper.createDataFormat().getFormat( "yyyyMMdd HH:mm:ss")); cellStyle1.setBorderBottom(CellStyle.BORDER_THIN); cellStyle1.setBottomBorderColor(IndexedColors.BLACK.getIndex()); cellStyle1.setBorderLeft(CellStyle.BORDER_THIN); cellStyle1.setLeftBorderColor(IndexedColors.GREEN.getIndex()); cellStyle1.setBorderRight(CellStyle.BORDER_THIN); cellStyle1.setRightBorderColor(IndexedColors.BLUE.getIndex()); cellStyle1.setBorderTop(CellStyle.BORDER_MEDIUM_DASHED); cellStyle1.setTopBorderColor(IndexedColors.BLACK.getIndex()); cell = row.createCell(4); cell.setCellValue(Calendar.getInstance()); cell.setCellStyle(cellStyle1); FileOutputStream fileOut = new FileOutputStream("e:/test/workbook.xls"); wb.write(fileOut); fileOut.close(); } |
