处理结果：把a,b列相同内容的单元格进行合并引入easyexcel：<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.2.1</version></dependency>示例代码：publicvoidexportStrategyDetail(

 将数据一条一条查出来千万不要用一对多查询最后用方法进行合并publicclassExcelFileCellMergeStrategyimplementsCellWriteHandler{/***合并列的范围索引*/privateint[]mergeColumnIndex;/***合并起始行索引*/privateintmer