java导出excel文件

public String exportDispatchExcel()
	{
		String path=this.contextPvd.getRequest().getRealPath("/file/excel");
		List<TblKepuoaRecordDispatch> list = (List<TblKepuoaRecordDispatch>) this.getOamessage().getAlluserList();
		TblKepuoaRecordDispatch dispatch=new TblKepuoaRecordDispatch();
		String file="";
		try {
			file = createExcel(path,"发文列表",list,dispatch);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}//开始创建excel表
		filedownPath=path+File.separator+file;//执行下载操作  	
		return "downLoadDispatch";
	}
	
          /**
	 * 导出excel文件
	 * @param path  导出的路径
	 * @param filename  导出文件的名字
	 * @param list  要导出的对象list
	 * @param study  TblKepuoaStudy实体类  对象
	 * @return
	 * @throws Exception
	 */
	public String createExcel(String path,String filename,List list,TblKepuoaRecordDispatch dispatch) throws Exception{
		File file = new File(path+File.separator+filename+".xls" );
		 WritableWorkbook wbook = null;
		try {
			wbook = Workbook.createWorkbook(file);
		 // 建立excel文件
			String tmptitle = filename; // 标题
			WritableSheet wsheet = wbook.createSheet(filename, 0); // sheet名称
			  // 设置excel标题
			WritableFont wfont = new WritableFont(WritableFont.createFont("宋体"), 13, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE,Colour.BLACK);
			WritableCellFormat wcfFC = new WritableCellFormat(wfont);			   
			wsheet.addCell(new Label(4, 0, tmptitle, wcfFC));
			wfont = new jxl.write.WritableFont(WritableFont.createFont("宋体"), 10,WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,Colour.BLACK);
			wcfFC = new WritableCellFormat(wfont);
			wcfFC.setBorder(Border.NONE,BorderLineStyle.NONE); 
			  // 开始生成主体内容                
			wsheet.addCell(new Label(0, 1, "序号",wcfFC));
			wsheet.addCell(new Label(1, 1, "文件名称",wcfFC));
			wsheet.addCell(new Label(2, 1, "经办人",wcfFC));
			wsheet.addCell(new Label(3, 1, "发文日期",wcfFC));
			wsheet.addCell(new Label(4, 1, "收文机关",wcfFC));
			wsheet.addCell(new Label(5, 1, "档案提供者",wcfFC));
			int j = 2;
			for (int i = 0; i < list.size(); i++) {
				dispatch=(TblKepuoaRecordDispatch) list.get(i);
				 String uptime="";
				if(dispatch.getDispatchDate()!=null&&!"".equals(dispatch.getDispatchDate())){
					uptime=sdf2.format(dispatch.getDispatchDate());//时间格式化
				}
				wsheet.addCell(new Label(0, j, i+1+"",wcfFC));
				wsheet.addCell(new Label(1, j,dispatch.getDispatchName(),wcfFC));
				if(dispatch!=null && dispatch.getDispatchOpreator()!=null && !"".equals(dispatch.getDispatchOpreator())){
					if(dispatch.getCode()!=null && !"".equals(dispatch.getCode())){
						wsheet.addCell(new Label(2, j,dispatch.getDispatchOpreator()+"-"+dispatch.getCode(),wcfFC));
					}else{
						wsheet.addCell(new Label(2, j,dispatch.getDispatchOpreator(),wcfFC));
					}
				}
				wsheet.addCell(new Label(3, j, uptime,wcfFC));
				wsheet.addCell(new Label(4, j,dispatch.getDispatchOrgan(),wcfFC));
				wsheet.addCell(new Label(5, j, dispatch.getRecordSupportPeople(),wcfFC));
				j++;
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			Loggers.info("DispatchAction 中 createExcel 方法："+e.getMessage());
			e.printStackTrace();
		}finally{
			if(wbook != null){
				wbook.write(); // 写入文件
				wbook.close();
			}
		}
		  // 主体内容生成结束        
		return filename+".xls";
}