import java.io.IOException;
import java.io.OutputStream;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;

public class SimpleExcelWrite {
    public void createExcel(OutputStream os) throws WriteException,IOException{
        //创建工作薄
        WritableWorkbook workbook = Workbook.createWorkbook(os);
        //创建新的一页
        WritableSheet sheet = workbook.createSheet("First Sheet",0);
        //创建要显示的内容,创建一个单元格，第一个参数为列坐标，第二个参数为行坐标，第三个参数为内容
        Label xuexiao = new Label(0,0,"学校");
        sheet.addCell(xuexiao);
        Label zhuanye = new Label(1,0,"专业");
        sheet.addCell(zhuanye);
        Label jingzhengli = new Label(2,0,"专业竞争力");
        sheet.addCell(jingzhengli);
        
        Label qinghua = new Label(0,1,"清华大学");
        sheet.addCell(qinghua);
        Label jisuanji = new Label(1,1,"计算机专业");
        sheet.addCell(jisuanji);
        Label gao = new Label(2,1,"高");
        sheet.addCell(gao);
        
        Label beida = new Label(0,2,"北京大学");
        sheet.addCell(beida);
        Label falv = new Label(1,2,"法律专业");
        sheet.addCell(falv);
        Label zhong = new Label(2,2,"中");
        sheet.addCell(zhong);
        
        Label ligong = new Label(0,3,"北京理工大学");
        sheet.addCell(ligong);
        Label hangkong = new Label(1,3,"航空专业");
        sheet.addCell(hangkong);
        Label di = new Label(2,3,"低");
        sheet.addCell(di);
        
        //把创建的内容写入到输出流中，并关闭输出流
        workbook.write();
        workbook.close();
        os.close();
    }
    
}

import java.io.File;   import java.io.FileInputStream;   
import java.io.InputStream;   
import jxl.Cell;   import jxl.CellType;   import jxl.Sheet;   import jxl.Workbook;   import jxl.write.Label;   
public class ExcelOperater    
{     
    public static void main(String[] args)        {    
       jxl.Workbook readwb = null;   
       try    
       {    
//构建Workbook对象, 只读Workbook对象               
          //直接从本地文件创建Workbook    
          InputStream instream = new FileInputStream("F:/红楼人物.xls");              
          readwb = Workbook.getWorkbook(instream);               
          //Sheet的下标是从0开始     
          //获取第一张Sheet表    
          Sheet readsheet = readwb.getSheet(0);              
          //获取Sheet表中所包含的总列数               
          int rsColumns = readsheet.getColumns();              
          //获取Sheet表中所包含的总行数   
          int rsRows = readsheet.getRows();   
          //获取指定单元格的对象引用   
          for (int i = 0; i < rsRows; i++)   
          {   
             for (int j = 0; j < rsColumns; j++)   
             {   
                Cell cell = readsheet.getCell(j, i);                       
                System.out.print(cell.getContents() + " ");   
             }   
             System.out.println();   
           }   
           //利用已经创建的Excel工作薄,创建新的可写入的Excel工作薄   
           jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(new File("F:/红楼人物1.xls"), readwb);   
           //读取第一张工作表   
           jxl.write.WritableSheet ws = wwb.getSheet(0);   
           //获得第一个单元格对象   
           jxl.write.WritableCell wc = ws.getWritableCell(0, 0);   
           //判断单元格的类型, 做出相应的转化   
           if (wc.getType() == CellType.LABEL)    
           {   
               Label l = (Label) wc;   
               l.setString("新姓名");   
            }   
            //写入Excel对象   
            wwb.write();   
            wwb.close();   
        } catch (Exception e) {   
           e.printStackTrace();   
        } finally {   
           readwb.close();   
        }   
    }   
}