自己用的测试类

package importTest;

import java.io.File;
import java.io.IOException;
import java.sql.Timestamp;
import java.util.Date;
import java.util.concurrent.TimeUnit;

import jxl.Cell;
import jxl.CellType;
import jxl.DateCell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.format.CellFormat;
import jxl.read.biff.BiffException;
import jxl.write.DateFormat;
import jxl.write.DateTime;
import jxl.write.Label;
import jxl.write.NumberFormat;
import jxl.write.WritableCellFormat;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

public class ImportTestClass {
 

 private static final CellFormat DateTime = null;

 public void doImport() throws BiffException, IOException
 {
  String fileurl="D:\\book.xls";
  Workbook  workbook=Workbook.getWorkbook(new File(fileurl));
  Sheet sheet=workbook.getSheet(0);
  int t=workbook.getNumberOfSheets();
  System.out.println("number of sheets ="+t);
  for(int i=1;i<sheet.getRows();i++)
  {
   Cell nameCell=sheet.getCell(0, i);
   String name=nameCell.getContents();
   int row=nameCell.getRow();
   System.out.println("name in row="+row);
   System.out.println(name);
   Cell birthdayCell=sheet.getCell(3,i);
   if(birthdayCell.getType()==CellType.DATE)
   {
    DateCell datecell=(DateCell)birthdayCell;
    Date birtyday=datecell.getDate();
    System.out.println(birtyday);
   }
   
  }
  workbook.close();
 }
 
 public void writeExcel() throws IOException, RowsExceededException, WriteException
 {
  //创建工作簿
  WritableWorkbook wriworkbook=Workbook.createWorkbook(new File("D:\\writableWorkbool.xls"));
  //新建工作表
  WritableSheet sheet=wriworkbook.createSheet("new workbook", 0);
  
  //单元格格式  日期格式
  WritableCellFormat format=new WritableCellFormat(new DateFormat("yyyy/MM/dd"));
  WritableCellFormat numformat=new WritableCellFormat(new NumberFormat("0.00"));
  
  //添加单元格
  sheet.addCell(new Label(0,0,"日期"));
  sheet.addCell(new Label(1,0,"金额"));
  sheet.addCell(new Label(1,1,"26"));
  Label lable=new Label(0,1 , "2010/5/6");
  sheet.addCell(lable);
  wriworkbook.write();
  wriworkbook.close();
 }
 
 public void updaeExcel() throws BiffException, IOException, WriteException
 {
  Workbook workbook=Workbook.getWorkbook(new File("D:\\writableWorkbool.xls"));
  WritableWorkbook wri=Workbook.createWorkbook(new File("D:\\writableWorkbool.xls"), workbook);
  WritableSheet sheet=wri.getSheet("new workbook");
  Cell cell=sheet.getCell(0,0);
  Label lable1=(Label)cell;
  lable1.setString("come here ");
  wri.write();
  wri.close();
  workbook.close();
  
 }
 
 public static void main(String[] args) throws BiffException, IOException, RowsExceededException, WriteException {
  ImportTestClass im=new ImportTestClass();
  im.doImport();
  im.writeExcel();
  im.updaeExcel();
 }

}