Java POI操作Excel(二)

// Define a few rows 定义几行
for (int rownum = 0; rownum < 30; rownum++) {
r = s.createRow(rownum);
for (int cellnum = 0; cellnum < 10; cellnum += 2) {
c = r.createCell(cellnum);
Cell c2 = r.createCell(cellnum + 1);

c.setCellValue((double) rownum + (cellnum / 10));
c2.setCellValue(createHelper.createRichTextString("Hello! "
+ cellnum));
}
}

// Save 保存
String filename = "d://workbook.xls";
if (wb instanceof XSSFWorkbook) {
filename = filename + "x";
}

FileOutputStream out = new FileOutputStream(filename);
wb.write(out);
out.close();
}

}
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java读取Excel，同时兼容2003及以前版本和2007版本：

public class PoiReadExcel {

public void readExcel(String filePath) {

try {

Workbook workBook = null;
try {
workBook = new XSSFWorkbook(filePath); //支持2007
} catch (Exception ex) {
workBook = new HSSFWorkbook(new FileInputStream(filePath)); //支持2003及以前
}

// 获得Excel中工作表个数
System.out.println("工作表个数 :" + workBook.getNumberOfSheets());

//循环每个工作表
for (int i = 0; i < workBook.getNumberOfSheets(); i++) {
// 创建工作表
Sheet sheet = workBook.getSheetAt(i);

int rows = sheet.getPhysicalNumberOfRows(); // 获得行数
if (rows > 0) {
sheet.getMargin(Sheet.TopMargin);
for (int r = 0; r < rows; r++) { // 行循环
Row row = sheet.getRow(r);
if (row != null) {

int cells = row.getLastCellNum();// 获得列数
for (short c = 0; c < cells; c++) { // 列循环
Cell cell = row.getCell(c);

if (cell != null) {
String value = getValue(cell);
System.out.println("第" + r + "行 " + "第" + c
+ "列：" + value);
}
}
}
}
}

// 查询合并的单元格
for (i = 0; i < sheet.getNumMergedRegions(); i++) {
System.out.println("第" + i + "个合并单元格");
CellRangeAddress region = sheet.getMergedRegion(i);
int row = region.getLastRow() - region.getFirstRow() + 1;
int col = region.getLastColumn() - region.getFirstColumn() + 1;
System.out.println("起始行:" + region.getFirstRow());
System.out.println("起始列:" + region.getFirstColumn());
System.out.println("所占行:" + row);
System.out.println("所占列:" + col);
}
}

} catch (Exception ex) {
ex.printStackTrace();
}
}

public String getValue(Cell cell) {

String value = "";
switch (cell.getCellType()) {

case Cell.CELL_TYPE_NUMERIC: // 数值型
if (DateUtil.isCellDateFormatted(cell)) {
// 如果是date类型则 ，获取该cell的date值
value = DateUtil.getJavaDate(cell.getNumericCellValue()).toString();
} else {// 纯数字
value = String.valueOf(cell.getNumericCellValue());
}
break;
/* 此行表示单元格的内容为string类型 */
case Cell.CELL_TYPE_STRING: // 字符串型
value = cell.getRichStringCellValue().toString();
break;
case Cell.CELL_TYPE_FORMULA:// 公式型
// 读公式计算值
value = String.valueOf(cell.getNumericCellValue());
if (value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串
value = cell.getRichStringCellValue().toString();
}
// cell.getCellFormula();读公式
break;
case Cell.CELL_TYPE_BOOLEAN:// 布尔
value = " "+ cell.getBooleanCellValue();
break;
/* 此行表示该单元格值为空 */
case Cell.CELL_TYPE_BLANK: // 空值
value = "";
break;
case Cell.CELL_TYPE_ERROR: // 故障
value = "";
break;
default:
value = cell.getRichStringCellValue().toString();
}

return value;
}

public static void main(String args[]) {

PoiReadExcel im = new PoiReadExcel();

im.readExcel("F:/2003.xls");
//im.readExcel("F:/2007.xlsx");
//im.readExcel("F:/2007.xls"); //2007下保存为2003

}

}