import java.io.File; 
import java.util.*; 
import jxl.*;
import jxl.write.*; 

public class myExcel{
  Workbook workbook;
  Sheet sheet;
  public void write(){
    try{
        //創建一個可寫入的excel文件對象
        WritableWorkbook workbook = Workbook.createWorkbook(new File("myfile.xls")); 
        //使用第一張工作表，將其命名為“午餐記錄”
        WritableSheet sheet = workbook.createSheet("午餐記錄", 0); 
        //表頭
        Label label0 = new Label(0, 0, "時間"); 
        sheet.addCell(label0); 
        Label label1 = new Label(1, 0, "姓名"); 
        sheet.addCell(label1); 
        Label label2 = new Label(2, 0, "午餐標準"); 
        sheet.addCell(label2); 
        Label label3 = new Label(3, 0, "實際費用"); 
        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); 
         //格式化數字
        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); 
        //關閉對象，釋放資源
        workbook.write(); 
        workbook.close(); 

    }catch(Exception e){
      System.out.println(e);
    }
  }
  
  public String[] readLine(int row){
    try{
      //獲取數據表列數
      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;
    }
  }

  public String read(int col, int row){
    try{
      //獲得單元數據
      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;
    }
  }

  public static void main(String[] arges){
    try{
      myExcel me = new myExcel();
      //生成一個可讀取的excel文件對象
      me.workbook = Workbook.getWorkbook(new File("myfile.xls"));
      //使用第一個工作表
      me.sheet = me.workbook.getSheet(0);
      //讀一行記錄，并顯示出來
      String[] ssTemp = me.readLine(1);
      for(int i=0;i<ssTemp.length;i++)
       System.out.println(ssTemp[i]);
      //寫入數據
      me.write();
      
      me.workbook.close();
    }catch(Exception e){
      System.out.println(e);
    }
  }
   
}