EasyExcel

• 简介
• 写excel（2.7.0版本）
• • 1. 创建excel对应的实体对象（复杂头写入）
  • 2. 获取写入的数据
  • 3. Web中的写
• 读Excel（2.7.0版本）
• • 1. 创建excel对应的实体对象（复杂头读取）
  • 2. 监听器
  • 3. 接口
  • 4. 读excel

简介

EasyExcel是一个基于Java的简单、省内存的读写Excel的开源项目。在尽可能节约内存的情况下支持读写百M的Excel。
github地址:https://github.com/alibaba/easyexcel
语雀地址:https://www.yuque.com/easyexcel/doc/easyexcel

写excel（2.7.0版本）

1. 创建excel对应的实体对象（复杂头写入）

@Data
@HeadStyle(fillPatternType = FillPatternType.SOLID_FOREGROUND, fillForegroundColor = 5)
@HeadFontStyle(fontHeightInPoints = 15, color = 2)
@HeadRowHeight(20)
@ContentRowHeight(15)
@ContentStyle(horizontalAlignment = HorizontalAlignment.CENTER)
@ColumnWidth(35)
@ApiModel(value = "DemoDto")
public class DemoDto{

    @ExcelProperty(value = "名称", index = 0)
    private String name;

    @ExcelProperty(value = "日期", index = 1)
    private Date date;

    @ExcelProperty(value = "数量", index = 2)
    private Integer count;

    @ApiModelProperty(value = "行号")
    @ExcelIgnore
    private Integer rowIndex;

}

2. 获取写入的数据

/**
 * 第一个Sheet写入的数据
 */
private List<DemoDto> getDemoData1() {
    List<DemoDto> dtoList = new ArrayList<DemoDto>();
    List<DemoVo> voList = this.demoMapper.getDemoData1();
    for (DemoVo vo : voList) {
        DemoDto dto = new DemoDto();
        dto.setName(vo.getName());
        dto.setDate(vo.getDate());
        dto.setCount(vo.getCount());
        dtoList.add(dto);
    }
    return dtoList;
}

/**
 * 第二个Sheet写入的数据
 */
private DemoDto getDemoData2() {
	DemoVo vo = this.demoMapper.getDemoData2();
    DemoDto dto = new DemoDto();
    dto.setName(vo.getName());
    dto.setDate(vo.getDate());
    dto.setCount(vo.getCount());
    return dto;
}

3. Web中的写

表头样式：HeadStyleHandler
自动列宽：LongestMatchColumnWidthStyleStrategy

@GetMapping("download")
public void download(HttpServletResponse response) throws IOException {
    response.setContentType("application/vnd.ms-excel");
    response.setCharacterEncoding("utf-8");
    String fileName = URLEncoder.encode("Web写样例", "UTF-8").replaceAll("\\+", "%20");
    response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
    ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
    WriteSheet writeSheet1 = EasyExcel.writerSheet(0, "第一个Sheet得名称").head(DemoDto.class)
            .registerWriteHandler(new HeadStyleHandler())
            .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
            .build();
    excelWriter.write(getDemoData1(), writeSheet1);
    WriteSheet writeSheet2 = EasyExcel.writerSheet(1, "第二个Sheet得名称").head(DemoDto.class)
            .registerWriteHandler(new HeadStyleHandler())
            .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
            .build();
    excelWriter.write(Arrays.asList(getDemoData2()), writeSheet2);
    //关闭流
    excelWriter.finish();
}

读Excel（2.7.0版本）

1. 创建excel对应的实体对象（复杂头读取）

@Data
@HeadStyle(fillPatternType = FillPatternType.SOLID_FOREGROUND, fillForegroundColor = 5)
@HeadFontStyle(fontHeightInPoints = 15, color = 2)
@HeadRowHeight(20)
@ContentRowHeight(15)
@ContentStyle(horizontalAlignment = HorizontalAlignment.CENTER)
@ColumnWidth(35)
@ApiModel(value = "DemoDto")
public class DemoDto{

    @ExcelProperty(value = "名称", index = 0)
    private String name;

    @ExcelProperty(value = "日期", index = 1)
    private Date date;

    @ExcelProperty(value = "数量", index = 2)
    private Integer count;

    @ApiModelProperty(value = "行号")
    @ExcelIgnore
    private Integer rowIndex;

}

2. 监听器

@Slf4j
public class DemoListener extends AnalysisEventListener<DemoDto> {

    // 最大处理条数
    private static final int BATCH_COUNT = 5;

    List<DemoDto> list = new ArrayList<>();

    private DemoService demoService;

    public DemoListener () {

    }

    /**
     * 构造函数，传入处理类
     *
     * @param demoService
     */
    public DemoListener (DemoService demoService) {
        this.demoService= demoService;
    }

    /**
     * 解析每一条数据调用方法
     *
     * @param data
     * @param context
     */
    @Override
    public void invoke(DemoDtodata, AnalysisContext context) {
        log.info("解析数据:{}", JSON.toJSONString(data));
        data.setRowIndex(context.readRowHolder().getRowIndex() + 1);
        list.add(data);
        if (list.size() >= BATCH_COUNT) {
            list.clear();
        }
    }

    /**
     * 解析完成调用方法
     *
     * @param context
     */
    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        log.info("所有数据解析完成！");
    }

}

3. 接口

public interface DemoService {
	/**
     * 导入数据
     *
     * @param file
     * @return
     */
    List<DemoDto> importData(MultipartFile file);
}

4. 读excel

@Slf4j
@Service
public class DemoServiceImpl implements DemoService {
    @Autowired
    private DemoService demoService ;
    
    /**
     * 导入数据
     *
     * @param file
     * @return
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public List<DemoDto> importData(MultipartFile file) {
		// 获取excel数据
        List<DemoDto> dtoList = null;
        try {
            InputStream input1Stream = file.getInputStream();
            List<DemoDto> dto1List = EasyExcel.read(input1Stream , new DemoListener (this))
                    .head(DemoDto.class).sheet(0, "第一个Sheet得名称").headRowNumber(3).doReadSync();
            InputStream input2Stream = file.getInputStream();
    		List<DemoDto> dto2List = EasyExcel.read(input2Stream , new DemoListener (this))
            .head(DemoDto.class).sheet(1, "第二个Sheet得名称").headRowNumber(3).doReadSync();
             dtoList.addAll(dto1List);
             dtoList.addAll(dto2List);       
        } catch (IOException e) {
            e.printStackTrace();
        }
        return dtoList;
	}
}