导出excel报表

一个工程要动态生成excel报表是经常的事，一般情况下，生成的报表都是供用户查看或者下载，我们往往不需要将其生成到服务器的硬盘里，最好是生成到缓存里供本次调用，这时我们可以采用io流，代码如下：

public class Excel {
    \**
     * 把ArrayList<ArrayList>里的数据生成Excel文件.xls
     * @param rowsList 结果集
     * @param response 不生成文件，直接保存/打开
     *\
    public static void getExcel(ArrayList<ArrayList> rowsList,HttpServletResponse response) throws FileNotFoundException, IOException, RowsExceededException,   writeException{

          response.setContentType("application/ms-excel");
          String sheetName = "11111.xls"; //Excel文件名称
          // attachment; 这个代表要下载的，如果去掉就编程直接打开了
          // filename是文件名，另存为或者下载时，为默认的文件名
          response.addHeader("Content-Disposition", "attachment; filename="+sheetName);
           java.io.OutputStream os = response.getOutputStream();
          WritableWorkbook wwb = Workbook.createWorkbook(os);
          jxl.write.WritableSheet ws = wwb.createSheet("22222", 0); // 创建Excel文件里的表单
          Label labelC = null;

          for(int j=0;j<rowsList.size();j++){ //循环记录数，即Excel中的行，因为有标题行，所以加1行
              for(int k=0;k<rowsList.get(0).size();k++){ //循环每条记录的列
                  labelC = new Label(k, j, rowsList.get(j).get(k).toString()); //列数，行数，内容，字体样式可省略
                  ws.addCell(labelC);
              }
       }
      if (wwb != null) {
      wwb.write();
      wwb.close();
   }
}
}

这是我做程序的代码：

public String exportExcel() throws Exception{
        response.setContentType("application/ms-excel");
        String sheetName = "11111.xls";
        response.addHeader("Content-Disposition", "attachment; filename="+sheetName);

//        String realpath = ServletActionContext.getServletContext().getRealPath("/cache/supplier.xls");
//        File file = new File(realpath);
//        if(file.exists())
//            file.delete();
        OutputStream os = response.getOutputStream();
        WritableWorkbook book = Workbook.createWorkbook(os);  
        WritableSheet sheet = book.createSheet("服务商信息", 0);
        Label label;
        Number number;
        label = new Label(0, 0, "序号");  
        sheet.addCell(label);   
        label = new Label(1, 0, "公司名称");  
        sheet.addCell(label);   
        label = new Label(2, 0, "负责人");  
        sheet.addCell(label);   
        label = new Label(3, 0, "服务项目");  
        sheet.addCell(label);   
        label = new Label(4, 0, "服务区域");  
        sheet.addCell(label);   
        label = new Label(5, 0, "派单数");  
        sheet.addCell(label);   
        label = new Label(6, 0, "成单率");  
        sheet.addCell(label);   
        label = new Label(7, 0, "信誉级别");  
        sheet.addCell(label);
        if(data==null){
            data = new Supplier();
        }
        List<Supplier> list = supplierService.findExcel(data);
        for(int i=0;i<list.size();i++){              
            number = new Number(0,i+1,i+1);
            sheet.addCell(number);
            label = new Label(1,i+1,list.get(i).getSupplierName());
            sheet.addCell(label);
            label = new Label(2,i+1,list.get(i).getResp());
            sheet.addCell(label);
            label = new Label(3,i+1,list.get(i).getServiceDes());
            sheet.addCell(label);
            label = new Label(4,i+1,list.get(i).getAreaDes());
            sheet.addCell(label);
            number = new Number(5,i+1,list.get(i).getCount());
            sheet.addCell(number);
            number = new Number(6,i+1,list.get(i).getRation());
            sheet.addCell(number);
            label = new Label(7,i+1,list.get(i).getCreditID());
            sheet.addCell(label);
        }  
        book.write();  
        book.close();
        return null;
    }

此方法使用的servlet默认方法，此外还有strut2的下载。有待研究