java导出excel以及获取excel数据

public class TestTwo{

  Workbook workbook;
  Sheet sheet;
 
  private static String fileName = "D:\\myfile.xls";
 
  public static void main(String[] arges){
    try{
      TestTwo me = new TestTwo();
      //生成一个可读取的excel文件对象
      me.workbook = Workbook.getWorkbook(new File(fileName));
      //使用第一个工作表
      me.sheet = me.workbook.getSheet(0);
      //读一行记录，并显示出来
      String[] ssTemp = me.readLine(1);
      for(int i=0;i<ssTemp.length;i++){
      System.out.println(ssTemp[i]);
     
      }
      //写入数据
      me.write();
      me.workbook.close();
    }catch(Exception e){
      System.out.println(e);
    }
}
  

  /**
   *写入文件操作
   */
  public void write(){
    try{
        //创建一个可写入的excel文件对象
        WritableWorkbook workbook = Workbook.createWorkbook(new File(fileName));
        //使用第一张工作表，将其命名为“午餐记录”
        WritableSheet sheet = workbook.createSheet("sheet", 0);
        //表头
        Label label0 = new Label(0, 0, "测试1");
        sheet.addCell(label0);
        Label label1 = new Label(1, 0, "测试2");
        sheet.addCell(label1);
        Label label2 = new Label(2, 0, "测试3");
        sheet.addCell(label2);
        Label label3 = new Label(3, 0, "测试4");
        sheet.addCell(label3);
        //格式化日期
        jxl.write.DateFormat df = new jxl.write.DateFormat("yyyy-dd-MM  hh:mm:ss");
        jxl.write.WritableCellFormat wcfDF = new jxl.write.WritableCellFormat(df);
        jxl.write.DateTime labelDTF = new jxl.write.DateTime(0, 1, new java.util.Date(), wcfDF);
        sheet.addCell(labelDTF);
        //普通字符
        Label labelCFC = new Label(1, 1, "riverwind");
        sheet.addCell(labelCFC);
         //格式化数字
        jxl.write.NumberFormat nf = new jxl.write.NumberFormat("#.##");
        WritableCellFormat wcfN = new WritableCellFormat(nf);
        jxl.write.Number labelNF = new jxl.write.Number(2, 1, 13.1415926, wcfN);
        sheet.addCell(labelNF);
       
        
        jxl.write.Number labelNNF = new jxl.write.Number(3, 1, 10.50001, wcfN);
        sheet.addCell(labelNNF);
        //关闭对象，释放资源
        workbook.write();
        workbook.close();

    }catch(Exception e){
      System.out.println(e);
    }
  }
 
  /**
   *读取excel文件一行数据
   */ 
  public String[] readLine(int row){
    try{
      int colnum = sheet.getColumns();
      String[] rest = new String[colnum];
      for(int i = 0; i < colnum; i++){
        String sTemp = read(i,row);
        if(sTemp!=null)
         rest[i] = sTemp;
      }
      return rest;
    }catch(Exception e){
      System.out.println("readLine err:"+e);
      workbook.close();
      return null;
    }
}

  /**
   *读取excel的指定单元数据
   */
  public String read(int col, int row){
    try{
      //获得单元数据
      Cell a2 = sheet.getCell(col,row);
      String rest = a2.getContents();
      return rest;
    }catch(Exception e){
      System.out.println("read err:"+e);
      workbook.close();
      return null;
    }
  }

}