用java将excel表格中的内容修改后写入到另一个excel中

 package nn;
 
 import java.io.File;
 
 import jxl.Cell;
 import jxl.Sheet;
 import jxl.Workbook;
 import jxl.write.Label;
 import jxl.write.WritableSheet;
 import jxl.write.WritableWorkbook;
 
 public class a {
     public static void main(String args[]) {
         try {
             Workbook book = Workbook.getWorkbook(new File("C:\\Users\\yaru\\Desktop\\abcd.xls"));
             // 获得第一个工作表对象
             Sheet sheet = book.getSheet(0);
 
              WritableWorkbook workbook = Workbook.createWorkbook(new File("C:\\Users\\yaru\\Desktop\\aaa3.xls"));
             WritableSheet sheet1 = workbook.createSheet("Sheet 1", 0);
 
             int i=0;
             int rownum = sheet.getRows();
             System.out.println(rownum);
 
             while(i<rownum)
             {
             Cell cell1 = sheet.getCell(3, i);
 
             String result = cell1.getContents();
 //            System.out.println(result+"123");
             result=result.trim();
 //            System.out.println(result+"123");
             Label lbl = new Label(3, i, result);
             sheet1.addCell(lbl);
 
             sheet1.setName("修改后"); // 给sheet页改名 
 
             i++;
             }
 
             workbook.write();
             workbook.close();
             book.close();
         } catch (Exception e) {
             System.out.println(e);
         }
     }
 }