The maximum number of Cell Styles was exceeded. You can define up to 64000 style in a .xlsx Workbook

The maximum number of Cell Styles was exceeded. You can define up to 64000 style in a .xlsx Workbook 创建单元格样式时，有64000个单元格创建了单元格样式，导致报错

如题，创建单元格样式时，有64000个单元格创建了单元格样式，导致报错，网上对此问题回复大都是 “创建单元格放在for循环外面”，那一个实例的情况下但凡有一个单元格修改样式就会覆盖其它所有，显然是解决不了问题的。

这个关键点在于 workbook.createCellStyle();

看源码：

每次创建会计数，大于 MAXIMUM_STYLE_ID 这个常量就会抛异常

接着看CellStyle子类只有2个：

且都实现了 org.apache.poi.common.Duplicatable 接口

这里有个copy方法且子类都有实现，那么只需要创建一个实例然后copy()，跳过workbook.createCellStyle();的计数，就不会超出 MAXIMUM_STYLE_ID常量了

修改后代码：

稍加改造下就可以解决这个问题

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The maximum number of Cell Styles was exceeded. You can define up to 64000 style in a .xlsx Workbook

The maximum number of Cell Styles was exceeded. You can define up to 64000 style in a .xlsx Workbook 创建单元格样式时，有64000个单元格创建了单元格样式，导致报错

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