POI读取Excel（简单程序）

import java.io.FileInputStream;

import java.text.SimpleDateFormat;

import java.util.Date;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFDateUtil;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.poifs.filesystem.POIFSFileSystem;

import org.apache.poi.ss.usermodel.Cell;

public class Readtwo {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(

"data.xls"));

HSSFWorkbook workBook = new HSSFWorkbook(fs);

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

for (int i = 0; i < workBook.getNumberOfSheets(); i++) {

System.out.println( i+ " ***************工作表名称：" + workBook.getSheetName(i)

+ " ************");

// 创建工作表

HSSFSheet sheet = workBook.getSheetAt(i);

int rows = sheet.getPhysicalNumberOfRows(); // 获得行数

if (rows > 0) {

sheet.getMargin(HSSFSheet.TopMargin);

for (int j = 0; j < rows; j++) { // 行循环

HSSFRow row = sheet.getRow(j);

if (row != null) {

int cells = row.getLastCellNum();//获得列数

for (int k = 0; k < cells; k++) { // 列循环

HSSFCell cell = row.getCell(k);

// /////////////////////

if (cell != null) {

System.out.println("第"+j+"行,第"+k+"列值："+readcell(cell));

}

}

}

}

}

}

} catch (Exception ex) {

ex.printStackTrace();

}

}

public static String readcell(HSSFCell cell) {

String value = "";

switch (cell.getCellType()) {

case HSSFCell.CELL_TYPE_NUMERIC: // 数值型

if (HSSFDateUtil.isCellDateFormatted(cell)) {

// 如果是date类型则 ，获取该cell的date值

Date date = new Date() ;

date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());

SimpleDateFormat SDF=new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");

value = SDF.format(date) ;

} else {// 纯数字

cell.setCellType (Cell.CELL_TYPE_STRING);

value = cell.getRichStringCellValue().toString();

//value = String.valueOf(cell.getNumericCellValue());//这会出现1.0 2.0的情况

}

break;

//此行表示单元格的内容为string类型

case HSSFCell.CELL_TYPE_STRING: // 字符串型

value = cell.getRichStringCellValue().toString();

break;

case HSSFCell.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 HSSFCell.CELL_TYPE_BOOLEAN:// 布尔

value = " " + cell.getBooleanCellValue();

break;

//此行表示该单元格值为空

case HSSFCell.CELL_TYPE_BLANK: // 空值

value = "";

break;

case HSSFCell.CELL_TYPE_ERROR: // 故障

value = "";

break;

default:

value = cell.getRichStringCellValue().toString();

}

return value;

}

}

来自：http://zhangyuefeng1983.blog.163.com/blog/static/108337252011124105737665/