EasyExcel导入工具(SpringMVC下使用)

easyExcel:由阿里巴巴公司开发,由github托管

github上有详细使用文档

github地址:https://github.com/alibaba/easyexcel/blob/master/quickstart.md

导入

1、模型类:可以是实体类

主要是@ExcelProperty注解

value:对应字段

index:对应导入模板是第几列(从0开始)

@ExcelProperty(value = "name", index = 0)

推荐使用有模型,因为导入模板如果有变化,index可以随时改变

2、Controller接收导入文件

//批量导入(有模型)
@RequestMapping("batchImport")
public ModelAndView batchImport(@RequestParam(value = "file", required=true)MultipartFile file) {
ModelAndView mv=new ModelAndView();
mv.setView(Jackson2Util.jsonView());
InputStream in = null;
try {
in = file.getInputStream();
// 解析每行结果在listener中处理
AnalysisEventListener listener = new ExcelListener(vehicleInfoService);
ExcelReader excelReader = new ExcelReader(in, ExcelTypeEnum.XLSX, null, listener);
//(第几个sheet,表头所在行数,表格对应实体类)
excelReader.read(new Sheet(1, 1, ExcelCardIssueVehicleInfo.class)); mv.addObject("res", "0"); } catch(Exception e) {
logger.error("批量导入失败!", e);
} finally {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return mv;
}

3、解析每行数据并入库

public class ExcelListener extends AnalysisEventListener {
private CardIssueVehicleInfoService cardIssueVehicleInfoService; public ExcelListener(CardIssueVehicleInfoService cardIssueVehicleInfoService) {
super();
this.cardIssueVehicleInfoService = cardIssueVehicleInfoService;
} private List<CardIssueVehicleInfo> datas = new ArrayList<CardIssueVehicleInfo>();
//每解析一行数据就走一遍invoke()方法
public void invoke(Object object, AnalysisContext context) {
//转为导入模型类
ExcelCardIssueVehicleInfo excel = (ExcelCardIssueVehicleInfo)object;
CardIssueVehicleInfo vehicleInfo = new CardIssueVehicleInfo();
try {
//导入模型类转为对应数据库的实体类:可以是同一个实体类
BeanUtils.copyProperties(vehicleInfo, excel);
datas.add(vehicleInfo); //数据存储到list,供批量导入处理,或后续自己业务逻辑处理。 } catch (Exception e) {
e.printStackTrace();
}
}
//解析完所有Excel数据后,走此方法
public void doAfterAllAnalysed(AnalysisContext context) {
try{
//入库
cardIssueVehicleInfoService.batchInsert(datas);
} catch(Exception e) {
logger.error("批量导入失败!", e);
}
datas.clear();//解析结束销毁不用的资源
} }

遇到问题及解决方案:

1、模型(实体类)支持String和int类型,不支持Short类型

2、在ExcelListener 类中,Spring注入Service层,会无法注入

解决:在Controller层,将已注入的Service,传入ExcelListener中

 AnalysisEventListener listener = new ExcelListener(vehicleInfoService);

并在ExcelListener的构造器中接收

public ExcelListener(CardIssueVehicleInfoService cardIssueVehicleInfoService) {
super();
this.cardIssueVehicleInfoService = cardIssueVehicleInfoService;
}

3、poi.jar和poi-ooxml.jar的版本一定要一致(easyExcel依赖poi),不然会报错

4、easyExcel基于POI的,遇到的报错,都可以按照POI的错误搜索解决办法

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