java将数据库中查询到的数据导入到Excel表格

1.Maven需要的依赖

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.14</version>
</dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.14</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-examples -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-examples</artifactId>
            <version>3.14</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-excelant -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-excelant</artifactId>
            <version>3.14</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
     <dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>3.14</version>
    </dependency>

2.导入示例

 /**
      * 黑名单查询
      * @param blackListBean
      * @return
      */
     @RequestMapping(value = "/blackList", method = RequestMethod.POST)
     @ResponseBody
     public BaseReturnModel blackList(
             @RequestBody BlackListBean blackListBean
     ) {
         BaseReturnModel baseReturnModel = new BaseReturnModel();
         List<BlackListBean> resultList = null;
         int total = 0;
         try {
             if (blackListBean.getDownLoad() == null) {
                 int start = (blackListBean.getPagination() - 1) * blackListBean.getRownum(); // 分页处理 //rownum页数
                 blackListBean.setStart(start);
             }
             if (blackListBean.getUserIds() != null && !"".equals(blackListBean.getUserIds())) {
                 blackListBean.setIdUsers(blackListBean.getUserIds().split(","));
             }
             resultList = blackListSerivce.selectBlackList(blackListBean);
             total = blackListSerivce.selectResult(blackListBean);

         } catch (Exception e) {
             // TODO: handle exception
             e.printStackTrace();
             baseReturnModel.setCode(200);// 状态
             baseReturnModel.setMess("系统错误");
         }
         if (blackListBean.getDownLoad() != null) {
             if (resultList.size() > 0) {
                 //创建一个表格
                 SXSSFWorkbook workbook = new SXSSFWorkbook();
                 //创建一个工作表
                 SXSSFSheet sheet = workbook.createSheet("sheet1");
                 //设置表头行
                 SXSSFRow xssfRow = sheet.createRow(0);
                 //设置单元格格式居中
                 CellStyle cellStyle = workbook.createCellStyle();
                 cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
                 //添加表头内容
                 SXSSFCell headCell = xssfRow.createCell(0);
                 headCell.setCellValue("站点ID");
                 headCell.setCellStyle(cellStyle);
                 // 单元格列宽 0代表列位置
                 sheet.setColumnWidth(0, 5500);
                 sheet.setColumnWidth(1, 5500);
                 sheet.setColumnWidth(2, 5500);
                 sheet.setColumnWidth(3, 5500);
                 sheet.setColumnWidth(4, 5500);

                 //设置每列的参数
                 headCell = xssfRow.createCell(1);
                 headCell.setCellValue("站点名称");
                 headCell.setCellStyle(cellStyle);

                 headCell = xssfRow.createCell(2);
                 headCell.setCellValue("黑名单手机号/单号");
                 headCell.setCellStyle(cellStyle);

                 headCell = xssfRow.createCell(3);
                 headCell.setCellValue("理由");
                 headCell.setCellStyle(cellStyle);

                 headCell = xssfRow.createCell(4);
                 headCell.setCellValue("时间");
                 headCell.setCellStyle(cellStyle);

                 int b = 1;
                 String s = JSON.toJSONString(resultList);
                 SimpleDateFormat sdf = new SimpleDateFormat
                         ("yyyy-MM-dd HH:mm:ss");
                 List<BlackListBean> list = JSON.parseArray(s, BlackListBean.class);
                 for (BlackListBean obj : list) {
                     xssfRow = sheet.createRow(b++);

                     //时间戳转换
                     Long aLong = new Long(obj.getCreateTime());
                     Date date = new Date(aLong);

                     //创建单元格,并添加值
                     SXSSFCell cell = xssfRow.createCell(0);
                     cell.setCellValue(obj.getIdUser());
                     cell.setCellStyle(cellStyle);

                     cell = xssfRow.createCell(1);
                     cell.setCellValue(obj.getName());
                     cell.setCellStyle(cellStyle);

                     cell = xssfRow.createCell(2);
                     cell.setCellValue(obj.getMobile());
                     cell.setCellStyle(cellStyle);

                     cell = xssfRow.createCell(3);
                     cell.setCellValue(obj.getNote());
                     cell.setCellStyle(cellStyle);

                     cell = xssfRow.createCell(4);
                     cell.setCellValue(sdf.format(date));
                     cell.setCellStyle(cellStyle);
                 }
                 //保存文件
                 String imgpath = "/usr/local/tomcat/apache-tomcat-8.5.32/webapps/excel/";
                 File file = new File(imgpath);
                 if (!file.exists()) {
                     file.mkdirs();
                 }
                 try {
                     String imgFilePath = imgpath + "blackList" + ".xlsx";
                     OutputStream outputStream = new FileOutputStream(imgFilePath);
                     baseReturnModel.setObj("/excel/" + "blackList" + ".xlsx");
                     baseReturnModel.setCode(200);
                     baseReturnModel.setMess("正在下载");

                     try {
                         workbook.write(outputStream);
                     } catch (IOException e) {
                         e.printStackTrace();
                         baseReturnModel.setCode(500);
                         baseReturnModel.setMess("写入失败");
                         baseReturnModel.setObj("");
                     }

                     try {
                         outputStream.close();
                         workbook.close();
                     } catch (IOException e) {
                         e.printStackTrace();
                     }

                 } catch (FileNotFoundException e) {
                     e.printStackTrace();
                     baseReturnModel.setCode(500);
                     baseReturnModel.setMess("下载失败");
                 }
                 return baseReturnModel;
             } else {
                 baseReturnModel.setCode(500);
                 baseReturnModel.setMess("没有可提供下载得内容");
                 return baseReturnModel;
             }
         }
         baseReturnModel.setCode(200);// 状态
         baseReturnModel.setMess("成功");
         baseReturnModel.setObj(resultList);
         baseReturnModel.setTotal(total);
         return baseReturnModel;
     }