引入依赖

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>easyexcel</artifactId>
        <version>1.1.2-beta5</version>
    </dependency>

写一个样式类实现Easy-Excel写回调

public class ExcelBuilder {
 /** EasyExcel Writer */
  private ExcelWriter writer;

  /** 保存每个sheet的头数据 */
  private Map<Integer, List<List<String>>> headMap = new ConcurrentHashMap<>(2);

  /** 保存每个Sheet的内容数据 */
  private Map<Integer, List<List<Object>>> bodyMap = new ConcurrentHashMap<>(2);

 /** Sheet索引 */
  private int sheetIndex = 0;
  /**
   * 创建一个ExcelBuilder对象
   *
   * @param os 输出流
   * @return ExcelBuilder
   */
  public ExcelBuilder create(OutputStream os) {
    writer =
        EasyExcelFactory.getWriterWithTempAndHandler(
            null,
            os,
            ExcelTypeEnum.XLS,
            true,
            new WriteHandler() {

              private Workbook workbook;

              private List<List<String>> head;

              private List<List<Object>> body;

              @Override
              public void sheet(int sheetNo, org.apache.poi.ss.usermodel.Sheet sheet) {
     
              }

              @Override
              public void row(int rowNum, Row row) {
                //自定义样式
              }

              @Override
              public void cell(int cellNum, Cell cell) {
               //自定义单元格样式
              }
            });
    return this;
  }
/**
   * 添加sheet的内容
   *
   * @param sheetName sheet名称
   * @param head 头部信息
   * @param body 内容信息
   * @return ExcelBuilder
   */
  public ExcelBuilder addSheet(String sheetName, List<List<String>> head, List<List<Object>> body) {
    int sheetNo = ++sheetIndex;
    this.headMap.put(sheetNo, head);
    this.bodyMap.put(sheetNo, body);

    Sheet sheet = new Sheet(sheetNo, 0);
    sheet.setSheetName(sheetName);
    sheet.setAutoWidth(true);
    sheet.setHead(head);

    TableStyle tableStyle = new TableStyle();
    tableStyle.setTableHeadBackGroundColor(IndexedColors.ROYAL_BLUE);
    tableStyle.setTableContentBackGroundColor(IndexedColors.WHITE);
    sheet.setTableStyle(tableStyle);

    this.writer.write1(body, sheet);
    return this;
  }

  /** 开始构建 */
  public void build() {
    this.writer.finish();
  }
}