使用 Apache-POI 隐藏所有额外的 excel 列 [英] Hide all extra excel columns with Apache-POI

问题描述

这是我的目标:

我正在使用 Apache POI 生成一个 xlsx 文件.我想隐藏我正在使用的列右侧的所有未使用的列.在 Excel 中，这是一个相对简单的操作:我可以选择所有无关的列，并在一个操作中告诉它们全部隐藏.在 Apache POI 中，我似乎唯一的选择是 sheet.setColumnHidden(index, true).如果我尝试为每个无关列执行此操作:

I am generating an xlsx file using Apache POI. I would like to hide all the unused columns to the right of the columns I am using. In Excel, this is a relatively simple operation: I can select all the extraneous columns and tell them all to hide in one action. In Apache POI, the only option I seem to have is sheet.setColumnHidden(index, true). If I try to do this for every extraneous column:

for (int i = myLastColumn+1; i < 16384; ++i) {
    sheet.setColumnHidden(i, true);
}

然后该库尝试创建超过 16,000 个列以隐藏它们，这是不切实际的:它会变得越来越慢，并且永远不会完成.似乎没有 setColumnRangeHidden 或类似的东西.

then the library tries to create over 16 thousand columns in order to hide them, which is impractical: it gets slower and slower as it goes, and never finishes. There doesn't seem to be a setColumnRangeHidden or anything like that.

有没有办法隐藏 Apache POI 中的几乎所有列?

Is there a way to hide nearly all the columns in Apache POI?

推荐答案

最终，通过查看 XSSFSheet 和 ColumnHelper 的工作原理，我设法找到了我想要的功能不见了.

Eventually, looking through how XSSFSheet and ColumnHelper work, I managed to find the bit of functionality I was missing.

当您尝试隐藏单个列时，ColumnHelper 会为您请求的索引创建一个新列(如果它不存在)，然后将其设置为隐藏.但是，列对象实际上是一个 CTCol，其中 min 和 max 字段设置为相同的索引.如果您创建具有不同 min 和 max 字段的 CTCol 对象，则可以在一个操作中设置所有匹配列的状态.

When you try and hide a single column, the ColumnHelper makes a new column for the index you requested (if it didn't exist), and then sets it to be hidden. However, the column object is actually a CTCol with min and max fields set to the same index. If you create a CTCol object with different min and max fields, you can set the state of all matching columns in one action.

因此:

CTCol col = sheet.getCTWorksheet().getColsArray(0).addNewCol();
col.setMin(myLastColumn+2);
col.setMax(16384); // the last column (1-indexed)
col.setHidden(true);

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