[java]HSSFWorkbook：读取并转换excel的cell值

package test.cell;

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.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.NumberToTextConverter;

public class TestCell {
public static void main(String[] args) throws Exception {
DoCell dc = new DoCell();

FileInputStream f = new FileInputStream("C:\\temp\\Book2.xls");//读取流
HSSFWorkbook b = new HSSFWorkbook(f);//建立workbook
HSSFSheet s = b.getSheet("Sheet1");//取得sheet

for (int i = s.getFirstRowNum(); i <= s.getLastRowNum(); i++) {//循环行

for (int j = 0; j < 2; j++) {//循环列
HSSFCell c = s.getRow(i).getCell(j);//取得cell

if(c!=null){
System.out.print("  " + getCellValue(c));//利用getCellValue方法打印值
}

}
System.out.println();
}
}
public static String getCellValue(Cell c) {

String r=null;
if(c==null){
r="";
}
switch(c.getCellType()){
case Cell.CELL_TYPE_BLANK://为 空值3
r="";
break;
case Cell.CELL_TYPE_BOOLEAN://boolean型4
r=c.getBooleanCellValue()+"";
break;
case Cell.CELL_TYPE_ERROR://错误 5
r="";
break;
case Cell.CELL_TYPE_FORMULA://公式型 2
Workbook wb = c.getSheet().getWorkbook();//取得workbook
CreationHelper helper = wb.getCreationHelper();//取得wb的帮助
FormulaEvaluator ev = helper.createFormulaEvaluator();//取得helper的公式计算方法
r=getCellValue(ev.evaluateInCell(c));//调用自身方法，括号里取得cellValue
break;
case Cell.CELL_TYPE_NUMERIC://数值型 0
if(DateUtil.isCellDateFormatted(c)){//如果是excel日期格式
SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//规定日期格式
Date d = c.getDateCellValue();//取得日期
r = s.format(d);//转换日期格式
}else{
r = NumberToTextConverter.toText(c.getNumericCellValue());//数值的话，转换为String
}
break;
case Cell.CELL_TYPE_STRING://字符串型 1
r=c.getRichStringCellValue().toString();//推荐使用getRichStringCellValue()；
//getStringCellValue()为老方法
break;
default:
r="";
}
return r;
}

}