Alibaba EasyExcel：多Sheet操作，不同Sheet注册不同样式执行器

EasyExcel 是阿里巴巴的一个基于Java的简单方便省内存的读写Excel开源项目。

常用方法，见官方文档：https://easyexcel.opensource.alibaba.com/docs/current/   

下面介绍，Alibaba EasyExcel：多Sheet操作，不同Sheet注册不同样式执行器版本 2.2.6+   

一、构建 ExcelWriter 对象，用来添加Sheet，及结束操作：

ExcelWriterBuilder excelWriterBuilder = EasyExcel.write(response.getOutputStream());
excelWriterBuilder.registerWriteHandler(。。。);
excelWriterBuilder.registerWriteHandler(。。。);
ExcelWriter excelWriter = excelWriterBuilder.build();

二、构建 Sheet 对象 WriteSheet：

List<List<String>> head = Lists.newArrayList(
        Lists.newArrayList("序号"),
        Lists.newArrayList("名称"), 
	Lists.newArrayList("联系人"),
        Lists.newArrayList("手机号"), 
	Lists.newArrayList("性别"),
        Lists.newArrayList("年龄"));

ExcelWriterSheetBuilder excelWriterSheetBuilder = EasyExcel.writerSheet(0, "sheetName");

excelWriterSheetBuilder.registerWriteHandler(。。。);
excelWriterSheetBuilder.registerWriteHandler(。。。);
excelWriterSheetBuilder.registerWriteHandler(。。。);

四、构建 Sheet 对象，并写入：

WriteSheet writeSheet = excelWriterSheetBuilder.head(head).build();
excelWriter.write(data, writeSheet);

excelWriter.finish();