read:
try{
    Workbook workbook = Workbook.getWorkbook(new File(path));
    Sheet sheet = workbook.getSheet(0);
    int rows=sheet.getRows();
    //System.out.println(rows);
    int col=sheet.getColumns();
    //System.out.println(col);
    for(int i=1;i<rows;i++)
    {
      for(int j=0;j<col;j++)
      {
            System.out.println(sheet.getCell(j,i).getContents());
            //can create your own model data from excel
      }
    }
    workbook.close();
   }catch(Exception e)
   {
    e.printStackTrace();
   }
   ---------------------------------------------------------------------
write excel :
try    {  
   WritableWorkbook book  =  Workbook.createWorkbook(new File(path));  
   
    WritableSheet sheet  =  book.createSheet( "新生信息统计" ,0 );   
    //can write data from model list
    //write string
    Label label0  =   new  Label( 0 ,  0 ,  "学生编号" );
    sheet.addCell(label0);  
    //write number 
    jxl.write.Number number  =   new  jxl.write.Number( 0 ,  1 , 1);
    sheet.addCell(number);  
    book.write();   
    book.close();  
 }   catch  (Exception e)   {  
           System.out.println(e);   
}