功能需求：批量导出市场活动
用户在市场活动主页面,点击"批量导出"按钮,把所有市场活动生成一个excel文件,弹出文件下载的对话框;
用户选择要保存的目录,完成导出市场活动的功能.
*导出成功之后,页面不刷新
功能分析：导出市场活动
1.给批量“导出”按钮，单击事件。点击按钮，向后台发送导出请求
2.后台controller接收请求，查询所有的市场活动
3.创建一个excel文件，把查询出来的文件写道excel文件中
4.把生成的excel文件，输出到浏览器，进行下载
文件导出插件:apache-poi插件
【技术准备】
把办公文档的所有元素封装成普通java类，通过操作这些类进行文件导出
- HSSFRow------行
- HSSFCell-------列
- HSSFSheet-------页
- HSSFWorkbook-------文件
- HSSFCellStyle--------样式
【插件使用】
1.添加依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.15</version>
</dependency>2.使用封装类生成excel
3.文件下载
全部导出流程图
代码实现
一、ActivityMapper
1.ActivityMapper接口
/**
* 批量导出
*/
List<Activity> selectAllActivities(); <select id="selectAllActivities" resultMap="BaseResultMap">
select a.id,
u1.name as owner,
a.name,
a.start_date,
a.end_date,
a.cost,
a.description,
a.create_time,
u2.name as create_by,
a.edit_time,
u3.name as edit_by
from tbl_activity a
join tbl_user u1 on a.owner = u1.id
join tbl_user u2 on a.create_by = u2.id
left join tbl_user u3 on a.edit_by = u3.id
order by a.create_time desc
</select>二、ActivityService
/**
* 批量导出
*/
List<Activity> queryAllActivities(); @Override
public List<Activity> queryAllActivities() {
return activityMapper.selectAllActivities();
}三、ActivityController
1.写一个下载文件的工具类HSSFUtils
/**
* 下载市场活动的Excel
* activityList 市场活动集合
* fileName文件名
*/
public static void createExcelByActivityList(List<Activity> activityList, String fileName, HttpServletResponse response) throws Exception {
// 2.创建Excel
// 2.1.1创建文件
HSSFWorkbook wb = new HSSFWorkbook();
// 2.1.2 创建表
HSSFSheet sheet = wb.createSheet("市场活动");
// 2.1.3 创建行和列
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell(0);
// 2.1.4 列的设置
cell.setCellValue("ID");
cell = row.createCell(1);
cell.setCellValue("所有者");
cell = row.createCell(2);
cell.setCellValue("名称");
cell = row.createCell(3);
cell.setCellValue("开始日期");
cell = row.createCell(4);
cell.setCellValue("结束日期");
cell = row.createCell(5);
cell.setCellValue("成本");
cell = row.createCell(6);
cell.setCellValue("描述");
cell = row.createCell(7);
cell.setCellValue("创建时间");
cell = row.createCell(8);
cell.setCellValue("创建者");
cell = row.createCell(9);
cell.setCellValue("修改日期");
cell = row.createCell(10);
cell.setCellValue("修改者");
if (activityList != null && activityList.size() > 0) {
Activity activity = null;
for (int i = 0; i < activityList.size(); i++) {
activity = activityList.get(i);
//生成行
row = sheet.createRow(i + 1);
//创建列
cell = row.createCell(0);
cell.setCellValue(activity.getId());
cell = row.createCell(1);
cell.setCellValue(activity.getOwner());
cell = row.createCell(2);
cell.setCellValue(activity.getName());
cell = row.createCell(3);
cell.setCellValue(activity.getStartDate());
cell = row.createCell(4);
cell.setCellValue(activity.getEndDate());
cell = row.createCell(5);
cell.setCellValue(activity.getCost());
cell = row.createCell(6);
cell.setCellValue(activity.getDescription());
cell = row.createCell(7);
cell.setCellValue(activity.getCreateTime());
cell = row.createCell(8);
cell.setCellValue(activity.getCreateBy());
cell = row.createCell(9);
cell.setCellValue(activity.getEditTime());
cell = row.createCell(10);
cell.setCellValue(activity.getEditBy());
}
}
// 3 调用工具函数生成Excel文件。
// 4 文件下载
// 4.1 设置响应类型 excel文件是application/octet-stream二进制文件
response.setContentType("application/octet-stream;charset=UTF-8");
// 激活文件下载窗口 Content-Disposition不打开，attachment附件
response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
// 4.2 获取输出流
ServletOutputStream out = response.getOutputStream();
wb.write(out);
// 3.2 关闭资源
wb.close();
out.flush(); // 输出流缓存中的内容强制输出,但并不会关闭输出流
}
/**
* 批量导出
*/
@RequestMapping("/workbench/activity/exportAllActivities.do")
public void exportAllActivities(HttpServletResponse response) throws Exception {
// 1 调用service方法，查询所有的市场活动
List<Activity> activityList = activityService.queryAllActivities();
// 2.文件下载
HSSFUtils.createExcelByActivityList(activityList,Contants.FILE_NAME_ACTIVITY,response);
}四、前端index.jsp
给批量的按钮添加单击事件，跳转到controller层
// 下载:全选
$("#exportActivityAllBtn").click(function () {
window.location.href = "workbench/activity/exportAllActivities.do";
});
