关于easyExcel中读取Excel表头的实例说明

        <!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

// 表格对应实体类
@Data
public class EasyExcelDemo {

    @ExcelProperty("标题")
    private String string;
    @ExcelProperty("日期")
    private Date date;
    @ExcelProperty("金额")
    private Double money;
    /**
     * 忽略这个字段
     */
    @ExcelIgnore
    private String name;
}

// 返回对象
@Data
public class Resp {
    private List<EasyExcelDemo> importList;

}

@RestController
@RequestMapping("/easyExcel")
@Slf4j
public class EasyExcelController {
    
    @PostMapping("/upload")
    public void upload(@RequestParam("file") MultipartFile file) throws IOException {
    	// 读取Excel    
        EasyExcel.read(file.getInputStream(), EasyExcelDemo.class,
                new EasyExcelListener()).sheet().headRowNumber(1).doRead();

        // 从监听中获取结果集
        Resp resp = EasyExcelListener.RESP.get();
        List<EasyExcelDemo> importList = resp.getImportList();
        log.info("导入集合 list = {}", importList);
        // 清除数据
        EasyExcelListener.RESP.remove();
    }
    
}

@Slf4j
public class EasyExcelListener extends AnalysisEventListener<EasyExcelDemo> {

    public static List<EasyExcelDemo> importList = new ArrayList<>();
    public static final ThreadLocal<Resp> RESP = new ThreadLocal<>();

    @Override
    public void invoke(EasyExcelDemo data, AnalysisContext context) {
        log.info("解析到的一条数据: excelRow = {}", data);
        importList.add(data);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        // 解析完所有excel行, 保存到数据库或进行业务处理
        log.info("解析的所有数据 list = {}", importList);
        Resp resp = new Resp();
        resp.setImportList(importList);
        RESP.set(resp);
    }

    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        log.info("表头数据 excelHead= {}", headMap);
    }
}

 EasyExcel.read(file.getInputStream(), EasyExcelDemo.class,
                new EasyExcelListener()).sheet().headRowNumber(1).doRead();

EasyExcel.read(file.getInputStream(), EasyExcelDemo.class, new EasyExcelListener()).sheet().headRowNumber(2).doRead(); EasyExcel.read(file.getInputStream(), EasyExcelDemo.class,
                new EasyExcelListener()).sheet().headRowNumber(2).doRead();