1.创建简单excel
public static void main(String[] args) throws Exception { Workbook wb=new HSSFWorkbook(); Sheet s1=wb.createSheet("第一个sheet页");//创建Sheet页 Row row=s1.createRow(0);//创建数据行 Cell cell=row.createCell(0);//创建单元格 cell.setCellValue(1); row.createCell(1).setCellValue(1.2);//单元格可写入不同格式的数据 row.createCell(2).setCellValue("啦啦"); row.createCell(3).setCellValue(false); FileOutputStream file=new FileOutputStream("e://poi_createCell.xls"); wb.write(file); file.close(); wb.close(); }
2.创建指定日期格式
public static void main(String[] args) throws Exception { Workbook wb=new HSSFWorkbook(); Sheet sheet=wb.createSheet("diyigeSheet页"); Row row=sheet.createRow(0); Cell cell=row.createCell(0); cell.setCellValue(new Date());//默认日期类型 42796.89489 CreationHelper creationHelper=wb.getCreationHelper(); CellStyle cellStyle=wb.createCellStyle(); cellStyle.setDataFormat(creationHelper.createDataFormat().getFormat("yy-MM-dd:hh ss")); cell=row.createCell(1);//创建指定日期类型数据 17-03-02:21 39 cell.setCellValue(new Date()); cell.setCellStyle(cellStyle); cell=row.createCell(2);//创建指定日期类型数据（第二种方式） 17-03-02:21 39 cell.setCellValue(Calendar.getInstance()); cell.setCellStyle(cellStyle); FileOutputStream fs=new FileOutputStream("e://poi_createData.xls"); wb.write(fs); fs.close(); wb.close(); }
3.读取excel内容，以文本格式展示
public static void main(String[] args) throws Exception { InputStream is=new FileInputStream("e:\poi_read.xls"); POIFSFileSystem fs=new POIFSFileSystem(is); HSSFWorkbook wb=new HSSFWorkbook(fs); @SuppressWarnings("resource") ExcelExtractor excelExtractor=new ExcelExtractor(wb); excelExtractor.setIncludeSheetNames(false);//控制是否读取sheet页名字 System.out.println(excelExtractor.getText()); }
4.设置excel中单元格内容样式
@SuppressWarnings("deprecation")
public static void main(String[] args) throws IOException {
Workbook wb=new HSSFWorkbook();
Sheet s1=wb.createSheet("第一个sheet页");
Row row=s1.createRow(0);
row.setHeightInPoints(30);
createCell(wb, row, (short)0, HSSFCellStyle.ALIGN_CENTER, HSSFCellStyle.VERTICAL_BOTTOM);//内容底部居中
createCell(wb,row,(short)1,HSSFCellStyle.ALIGN_FILL,HSSFCellStyle.VERTICAL_CENTER);//内容靠左垂直居中
createCell(wb, row, (short)2, HSSFCellStyle.ALIGN_LEFT, HSSFCellStyle.VERTICAL_TOP);//内容左上
createCell(wb,row,(short)3,HSSFCellStyle.ALIGN_RIGHT,HSSFCellStyle.VERTICAL_TOP);//内容右上
FileOutputStream fileOut=new FileOutputStream("e:\demo.xls");
wb.write(fileOut);
fileOut.close();
wb.close();
}
//设置单元格样式
private static void createCell(Workbook wb,Row row,short column,short halign,short valign){
Cell cell=row.createCell(column);//创建单元格
cell.setCellValue(new HSSFRichTextString("Align It"));//设置值
CellStyle cellStyle=wb.createCellStyle();//创建单元格样式
cellStyle.setAlignment(halign);//设置单元格水平方向对齐方式
cellStyle.setVerticalAlignment(valign);//设置单元格垂直方向对齐方式
cell.setCellStyle(cellStyle);//设置单元格样式
}
5.设置excel中单元格样式
@SuppressWarnings("deprecation")
public static void main(String[] args) throws Exception {
Workbook wb=new HSSFWorkbook();
Sheet sheet=wb.createSheet("sheet1");
Row row=sheet.createRow(1);
Cell cell=row.createCell(1);
cell.setCellValue(4);
CellStyle cellStyle=wb.createCellStyle();
cellStyle.setBorderBottom(CellStyle.BORDER_THIN);//底部边框
cellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());//底部边框颜色
cellStyle.setBorderLeft(CellStyle.BORDER_THIN);//左边边框
cellStyle.setLeftBorderColor(IndexedColors.GREEN.getIndex());//左边边框颜色
cellStyle.setBorderRight(CellStyle.BORDER_THIN);//右边边框
cellStyle.setRightBorderColor(IndexedColors.RED.getIndex());//右边边框颜色
cellStyle.setBorderTop(CellStyle.BORDER_THIN);//上边边框
cellStyle.setTopBorderColor(IndexedColors.BLUE.getIndex());//上边边框颜色
cell.setCellStyle(cellStyle);
FileOutputStream fileOut=new FileOutputStream("e:\createExcelDemo08.xls");
wb.write(fileOut);
fileOut.close();
wb.close();
}
6.设置excel中单元格前景色和背景色
public static void main(String[] args) throws Exception { HSSFWorkbook wb=new HSSFWorkbook(); Sheet sheet=wb.createSheet("第一个sheet"); Row row=sheet.createRow(1); Cell cell=row.createCell(1); cell.setCellValue("sjdsk"); CellStyle cellStyle=wb.createCellStyle(); cellStyle.setFillBackgroundColor(IndexedColors.GREEN.getIndex());//设置背景色 cellStyle.setFillPattern(CellStyle.BIG_SPOTS); cell.setCellStyle(cellStyle); Cell cell2=row.createCell(2); cell2.setCellValue("sjdsk"); CellStyle cellStyle2=wb.createCellStyle(); cellStyle2.setFillForegroundColor(IndexedColors.RED.getIndex());//设置前景色 cellStyle2.setFillPattern(CellStyle.SOLID_FOREGROUND); cell2.setCellStyle(cellStyle2); FileOutputStream fileOut=new FileOutputStream("e://createDemo10a.xls"); wb.write(fileOut); fileOut.close(); wb.close(); }
7.设置excel中合并单元格
public static void main(String[] args) throws Exception { Workbook wb=new HSSFWorkbook();//定义一个新的工作簿 Sheet sheet=wb.createSheet("第一个sheet页"); Row row=sheet.createRow(1); Cell cell=row.createCell(1); cell.setCellValue("单元格合并测试"); sheet.addMergedRegion(new CellRangeAddress( 1,//起始行 2,//结束行 1,//起始列 2//结束列 )); FileOutputStream file=new FileOutputStream("e:\createExcelDemo11a.xls"); wb.write(file); file.close(); wb.close(); }
8.设置excel文字样式
public static void main(String[] args) throws Exception { Workbook wb=new HSSFWorkbook(); Sheet sheet=wb.createSheet("第一个sheet页啦"); Row row=sheet.createRow(1); //创建一个字体处理类 Font font=wb.createFont(); font.setFontHeightInPoints((short)24);//设置字体大小 font.setItalic(true);//设置斜体 font.setStrikeout(true);//设置文字是否划线 CellStyle style=wb.createCellStyle(); style.setFont(font); Cell cell=row.createCell(1); cell.setCellValue("there are build a font"); cell.setCellStyle(style); FileOutputStream file=new FileOutputStream("e:\createExcelDemo12.xls"); wb.write(file); file.close(); wb.close(); }
9.设置添加数据到已有的单元格
public static void main(String[] args) throws Exception { InputStream input=new FileInputStream("e:\createExcelDemo12.xls"); POIFSFileSystem fs=new POIFSFileSystem(input); Workbook wb=new HSSFWorkbook(fs); Sheet sheet=wb.getSheetAt(0); Row row=sheet.getRow(1); Cell cell=row.getCell(1); if(cell==null){ cell=row.createCell(3); } cell.setCellType(Cell.CELL_TYPE_STRING); cell.setCellValue("测试POI添加数据到已有"); FileOutputStream fos=new FileOutputStream("e:\createExcelDemo12.xls"); wb.write(fos); fos.close(); wb.close(); }
10.设置excel单元格中可换行
public static void main(String[] args) throws Exception { Workbook wb=new HSSFWorkbook(); Sheet sheet=wb.createSheet("第一个sheet页"); Row row=sheet.createRow(0); Cell cell=row.createCell(0); cell.setCellValue("换个行啦 换了吗？？？"); CellStyle cs=wb.createCellStyle(); //设置可以换行 cs.setWrapText(true); cell.setCellStyle(cs); //调整下行的高度 row.setHeightInPoints(2*sheet.getDefaultRowHeightInPoints()); //调整单元格宽度 sheet.autoSizeColumn(2); FileOutputStream fileOut=new FileOutputStream("e:\createExceDemo14.xls"); wb.write(fileOut); fileOut.close(); wb.close(); }
11.设置excel中单元格数据精度
public static void main(String[] args) throws Exception { Workbook wb=new HSSFWorkbook(); FileOutputStream file=new FileOutputStream("e:\createExcelPOI_DEMO15.xls"); Sheet sheet=wb.createSheet(); CellStyle style; DataFormat format=wb.createDataFormat(); Row row; Cell cell; short rowNum=0; short cellNum=0; row=sheet.createRow(rowNum++); cell=row.createCell(cellNum++); cell.setCellValue(12.908); style=wb.createCellStyle(); style.setDataFormat(format.getFormat("0.0")); cell.setCellStyle(style);//输出12.9 row=sheet.createRow(rowNum++); cell=row.createCell(cellNum); cell.setCellValue(111111111111111.90899); style=wb.createCellStyle(); style.setDataFormat(format.getFormat("#,##0,000")); cell.setCellStyle(style);//输出111,111,111,111,112 wb.write(file); file.close(); wb.close(); }