POI读取excel单元格，获取单元格各类型值，返回字符串类型

package a;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;

import landprice.util.DateUtil;

public class TestReadFormula {
private static FormulaEvaluator evaluator;
public static void main(String[] args) throws IOException {
InputStream is=new FileInputStream("E:/temp/tempfile/1.xls");
HSSFWorkbook wb=new HSSFWorkbook(is);
Sheet sheet=wb.getSheetAt(0);

evaluator=wb.getCreationHelper().createFormulaEvaluator();

for (int i = 0; i <1; i++) {
Row  row=sheet.getRow(i);
for (Cell cell : row) {
System.out.println(getCellValueByCell(cell));
}
}
is.close();
}

//获取单元格各类型值，返回字符串类型
private static String getCellValueByCell(Cell cell) {
//判断是否为null或空串
if (cell==null || cell.toString().trim().equals("")) {
return "";
}
String cellValue = "";
int cellType=cell.getCellType();
if(cellType==Cell.CELL_TYPE_FORMULA){ //表达式类型
cellType=evaluator.evaluate(cell).getCellType();
}

switch (cellType) {
case Cell.CELL_TYPE_STRING: //字符串类型
cellValue= cell.getStringCellValue().trim();
cellValue=StringUtils.isEmpty(cellValue) ? "" : cellValue;
break;
case Cell.CELL_TYPE_BOOLEAN:  //布尔类型
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_NUMERIC: //数值类型
if (HSSFDateUtil.isCellDateFormatted(cell)) {  //判断日期类型
cellValue =	DateUtil.formatDateByFormat(cell.getDateCellValue(), "yyyy-MM-dd");
} else {  //否
cellValue = new DecimalFormat("#.######").format(cell.getNumericCellValue());
}
break;
default: //其它类型，取空串吧
cellValue = "";
break;
}
return cellValue;
}

}