POI 解析Excel（兼容 2003,2007）

（1）下载poi的jar包
geronimo-stax-api_1.0_spec-1.0.jar
dom4j-1.6.1.jar
log4j-1.2.13.jar
poi-3.7-20101029.jar
poi-ooxml-3.7-20101029.jar
poi-ooxml-schemas-3.7-20101029.jar
poi-scratchpad-3.7-20101029.jar
xmlbeans-2.3.0.jar
（2）创建一个javaBean来映射一列数据
package poi;package poi;

public class HolidayBean {

private String year ;
private String start_date ;
private String end_date ;
private String is_dayoff ;
private String remeark ;
public String getYear() {
return year;
}
public String getStart_date() {
return start_date;
}
public void setStart_date(String startDate) {
start_date = startDate;
}
public String getEnd_date() {
return end_date;
}
public void setEnd_date(String endDate) {
end_date = endDate;
}
public String getIs_dayoff() {
return is_dayoff;
}
public void setIs_dayoff(String isDayoff) {
is_dayoff = isDayoff;
}
public String getRemeark() {
return remeark;
}
public void setRemeark(String remeark) {
this.remeark = remeark;
}
public void setYear(String year) {
this.year = year;
}
}
(3) 创建一个解析Excel的类

package poi;

import java.io.FileInputStream;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import org.apache.log4j.Logger;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class PoiDo {
private static Logger logger = Logger.getLogger(PoiDo.class);
private static SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd") ;
// return Workbook by filepath
public static Workbook getWorkbook(String path) {
Workbook workBook = null;
try {
InputStream in = new FileInputStream(path);
workBook = WorkbookFactory.create(in);
} catch (Exception e) {
logger.error("Exception occur when create Workbook:" + e);
}
return workBook;
}

// parse WorkBook
public static ArrayList<HolidayBean> parseWorkBook(String filePath) {
Workbook workBook = getWorkbook(filePath);
ArrayList<HolidayBean> holidayBeans = new ArrayList<HolidayBean>();
// recycle sheet when Workbook contains sheet more than one
for (int i = 0, sheetSize = workBook.getNumberOfSheets(); i < sheetSize; i++) {
Sheet sheet = workBook.getSheetAt(i);
// recycle row
for (int j = 0, rowSize = sheet.getLastRowNum(); j < rowSize; j++) {
Row row = sheet.getRow(j);
// recycle cell to holidayBean
HolidayBean hb = new HolidayBean();
hb.setYear(parseCell(row.getCell(0))) ;
hb.setStart_date(parseCell(row.getCell(1))) ;
hb.setEnd_date(parseCell(row.getCell(2))) ;
hb.setIs_dayoff(parseCell(row.getCell(3))) ;
hb.setRemeark(parseCell(row.getCell(4))) ;
holidayBeans.add(hb) ;
}
}

return holidayBeans;
}

// parse cell to String
private static String parseCell(Cell cell) {
String cellValue;
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BLANK:
cellValue = "";
break;
case Cell.CELL_TYPE_BOOLEAN:
cellValue = Boolean.toString(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_ERROR:
cellValue = "";
break;
case Cell.CELL_TYPE_NUMERIC:{
if(DateUtil.isCellDateFormatted(cell)){
Date date = cell.getDateCellValue() ;
cellValue = format.format(date) ;
}else{
cellValue = String.valueOf(cell.getNumericCellValue());
}
}break;
case Cell.CELL_TYPE_STRING:
cellValue = cell.getStringCellValue();
break;
case Cell.CELL_TYPE_FORMULA: {
cell.setCellType(Cell.CELL_TYPE_STRING);
cellValue = cell.getStringCellValue();
}break;

default:
cellValue = "";
}
return cellValue;
}
public static void print(ArrayList<HolidayBean> list){
for(int i=0;i<list.size();i++){
HolidayBean hb = list.get(i) ;
System.out.print(hb.getYear()+"  "+hb.getStart_date()+"--"+hb.getEnd_date()+"   "+hb.getIs_dayoff()+"   "+hb.getRemeark());
System.out.println();
}
}
public static void main(String[] args) {
ArrayList<HolidayBean> hbList = parseWorkBook("D:\\biyesheji\\holiday.xlsx");
print(hbList) ;
}
}

其中parseCell是解析Cell，Excel 中日期的存储形式也是Numeric类型,所以在解析日期的时候判断这个cell是日期还是数字

if(DateUtil.isCellDateFormatted(cell)){
Date date = cell.getDateCellValue() ;
cellValue = format.format(date) ;
}else{
cellValue = String.valueOf(cell.getNumericCellValue());
}