java 操作excel文件之系列二：《读取数据库的内容写入excel文件》

要写入的文件：test.xls(sheet名也叫：test）

    public void createExcelTest(){

        //创建excel，设置sheet,表头,
        HSSFWorkbook workbook=new HSSFWorkbook();
        HSSFSheet sheet=workbook.createSheet("test");
        HSSFRow row=sheet.createRow(0);
        HSSFCell cell=row.createCell(0);
        cell.setCellValue("序号");
        cell=row.createCell(1);
        cell.setCellValue("查询词");
        cell=row.createCell(2);
        cell.setCellValue("cityid");
        cell=row.createCell(3);
        cell.setCellValue("cityname");
        cell=row.createCell(4);
        cell.setCellValue("showtype");
        cell=row.createCell(5);
        cell.setCellValue("cateid");

        //操作数据库，从数据库中取出数据
        Calendar c = Calendar.getInstance();
        Date date = new Date();
        c.setTime(date);
        c.add(Calendar.DAY_OF_YEAR, -30);
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
        String time = simpleDateFormat.format(c.getTime());
        System.out.println(time);
        String sql = String.format("select `keywords`,`cityid` from testTable where dt>%s limit 10000", time);
        logger.info("执行的sql：" + sql);
        List<List<Object>> results = HiveQuery.executeSql(sql);

        //将数据库查询结果写入excel，创建行和单元格
        for(int i=0;i<results.size();i++)
        {
            HSSFRow row1=sheet.createRow(i+1);
            row1.createCell(0).setCellValue(i);
            row1.createCell(1).setCellValue(results.get(i).get(0).toString());
            row1.createCell(2).setCellValue(results.get(i).get(1).toString());
        }
        try {
            FileOutputStream fos = new FileOutputStream("test.xls");
            workbook.write(fos);
            fos.close();
        }catch (IOException e){
            e.printStackTrace();
        }

    }

　　

下面是创建好的excel文件的内容：