POI读取excel单元格，获取单元格各类型值，返回字符串类型

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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;     }            }