com.alibaba
easyexcel
2.1.6
@ExcelProperty("商品编号")
private Integer gid;
@ExcelProperty("商品名称")
private String gname;
@ExcelProperty("商品价格")
private Float gprice;
@ExcelProperty("商品购买数量")
private Integer buynum;
@ExcelProperty("商品库存")
private Integer gnum;
//导出图片格式如下(照片路径一定是要真实路径,不然会报错)
//@ExcelProperty(value = {"商品图片"},converter = StringImageConverter.class)
//忽略导入
//@ExcelIgnore
@ExcelProperty("商品图片")
private String gpic;
public class DownExcel {
public static void download(HttpServletResponse response, Class t, List list) throws IOException, IllegalAccessException,InstantiationException {
response.setContentType("application/vnd.ms-excel");// 设置文本内省
response.setCharacterEncoding("utf-8");// 设置字符编码
response.setHeader("Content-disposition", "attachment;filename=demo.xlsx"); // 设置响应头
EasyExcel.write(response.getOutputStream(), t).sheet("模板").doWrite(list); //用io流来写入数据
}
}
//导出为Excel
@RequestMapping("/downloadexcel.do")
public void getExcel(HttpServletResponse response) throws IllegalAccessException, IOException,
InstantiationException {
List list = sysUserService.getAll();
DownExcel.download(response,SysUser.class,list);
}
int saveAll(List sysUsers);
xml如图所示:
insert into sys_user (name,nick_name,avatar,password,salt,email,mobile,status,dept_id,create_by,create_time,last_update_by,last_update_time)
values
(
#{item.name},
#{item.nickName},
#{item.avatar},
#{item.password},
#{item.salt},
#{item.email},
#{item.mobile},
#{item.status},
#{item.deptId},
#{item.createBy},
#{item.createTime},
#{item.lastUpdateBy},
#{item.lastUpdateTime}
)
void saveList(List list);
@Override
public void saveList(List list) {
sysUserMapper.saveAll(list);
}
// 有个很重要的点 ExcelListener 不能被spring管理,要每次读取excel都要new,然后里面用到spring可以构造方法传进去
public class ExcelListener extends AnalysisEventListener {
private List list = new ArrayList<>();
/**
* 每隔5条存储数据库,实际使用中可以3000条,然后清理list ,方便内存回收
*/
private static final int BATCH_COUNT = 5;
/**
* 假设这个是一个DAO,当然有业务逻辑这个也可以是一个service。当然如果不用存储这个对象没用。
*/
private SysUserService sysUserService;
/**
* 如果使用了spring,请使用这个构造方法。每次创建Listener的时候需要把spring管理的类传进来
*/
public ExcelListener(SysUserService sysUserService) {
this.sysUserService = sysUserService;
}
/**
* 这个每一条数据解析都会来调用
*/
@Override
public void invoke(SysUser goods, AnalysisContext analysisContext) {
System.out.println("解析到一条数据:========================"+goods.toString());
// 数据存储到datas,供批量处理,或后续自己业务逻辑处理。
list.add(goods);
// 达到BATCH_COUNT了,需要去存储一次数据库,防止数据几万条数据在内存,容易OOM
if(list.size() >= BATCH_COUNT){
saveData();
// 存储完成清理datas
list.clear();
}
}
/**
* 所有数据解析完成了 都会来调用
*/
@Override
public void doAfterAllAnalysed(AnalysisContext analysisContext) {
saveData();//确保所有数据都能入库
}
/**
* 加上存储数据库
*/
private void saveData() {
System.out.println("=============================="+list.size()+"条数据,开始存储到数据库");
sysUserService.saveList(list);
}
}
//导入Excel
@RequestMapping("/importexcel.do")
@ResponseBody
public String importexcel(@RequestParam(value = "excelFile") MultipartFile file) throws IOException{
EasyExcel.read(file.getInputStream(), SysUser.class, new ExcelListener(sysUserService)).sheet().doRead();
return "success";
}
资源下载:https://download.csdn.net/download/qq_37284798/87274449