如何使用 Apache POI 对 XSSFTable 列启用排序/过滤？

Question

我正在开发一个应用程序，它可以获取数据库记录并根据该数据创建一个 excel 文档。

excel文档生成良好，所有数据可读；作为该论坛的先前答案，该表也已适当生成（即使我滚动过去，标题行仍然可见，因此该表肯定存在）。但是，我曾期望一旦我有了一个表格，我就可以像在 excel 中“插入 - > 表格”一样对列进行排序和过滤，但是当我打开文档时没有这样的选项。

我在 XSSFTable 或 XSSFTableColumn 类上看不到 setFitlerable 或 setSortable 或类似的东西...如何启用对表格列的排序/过滤？

如果有用的话，下面是创建表的代码：

//Create table
CellReference topLeft = new CellReference(sheet.getRow(3).getCell(0));
CellReference bottomRight = new CellReference(sheet.getRow(nextRow-1).getCell(3));
AreaReference tableArea = workbook.getCreationHelper().createAreaReference(topLeft, bottomRight);
XSSFTable dataTable = sheet.createTable(tableArea);

dataTable.setName("TableData" + EXCEL_OBJECT_NUMBER);
dataTable.setDisplayName("TableData" + EXCEL_OBJECT_NUMBER);

XSSFTableColumn column = dataTable.getColumns().get(0);
column.setId(1);
column.setName("COLUMN1");

column = dataTable.getColumns().get(1);
column.setId(2);
column.setName("COLUMN2");

column = dataTable.getColumns().get(2);
column.setId(3);
column.setName("COLUMN3");

column = dataTable.getColumns().get(3);
column.setId(4);
column.setName("COLUMN4");

Answer 1

如果dataTable 是XSSFTable 而tableArea 是XSSFTable 的AreaReference，那么下面的代码会将自动过滤器设置到表头中，因为Excel 也会这样做：

dataTable.getCTTable().addNewAutoFilter().setRef(tableArea.formatAsString());

完整示例：

import java.io.FileOutputStream;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.util.AreaReference;
import org.apache.poi.ss.util.CellReference;

import java.util.GregorianCalendar;

class CreateExcelTable {

 public static void main(String[] args) throws Exception {

  Object[][] data = new Object[][] {
   new Object[] {"Text", "Date", "Number", "Boolean"},
   new Object[] {"Text 1", new GregorianCalendar(2020, 0, 1), 1234d, true},
   new Object[] {"Text 2", new GregorianCalendar(2020, 1, 15), 5678d, true},
   new Object[] {"Text 3", new GregorianCalendar(2020, 2, 1), 90.1234, false},
   new Object[] {"Text 4", new GregorianCalendar(2020, 3, 15), 567.89, false}
  };

  try (XSSFWorkbook workbook = new XSSFWorkbook();
       FileOutputStream fileout = new FileOutputStream("Excel.xlsx") ) {

   XSSFCellStyle dateCellStyle = workbook.createCellStyle();
   dateCellStyle.setDataFormat(14);

   XSSFSheet sheet = workbook.createSheet();
   XSSFRow row = sheet.createRow(0);
   XSSFCell cell = row.createCell(0);
   cell.setCellValue("Lorem ipsum");
   row = sheet.createRow(1);
   cell = row.createCell(0);
   cell.setCellValue("semit dolor");

   int nextRow = 3;
   int nextCol = 0;
   for (Object[] dataRow : data) {
    row = sheet.createRow(nextRow++);
    nextCol = 0;
    for (Object value : dataRow) {
     cell = row.createCell(nextCol++);
     if (value instanceof String) cell.setCellValue((String)value);
     else if (value instanceof GregorianCalendar) {
      cell.setCellValue((GregorianCalendar)value);
      cell.setCellStyle(dateCellStyle);
     }
     else if (value instanceof Double) cell.setCellValue((Double)value);
     else if (value instanceof Boolean) cell.setCellValue((Boolean)value);
    }
   }

   CellReference topLeft = new CellReference(sheet.getRow(3).getCell(0));
   CellReference bottomRight = new CellReference(sheet.getRow(nextRow-1).getCell(3));
   AreaReference tableArea = workbook.getCreationHelper().createAreaReference(topLeft, bottomRight);
   XSSFTable dataTable = sheet.createTable(tableArea);
   //dataTable.setName("Table1");
   dataTable.setDisplayName("Table1");

   //this styles the table as Excel would do per default
   dataTable.getCTTable().addNewTableStyleInfo();
   XSSFTableStyleInfo style = (XSSFTableStyleInfo)dataTable.getStyle();
   style.setName("TableStyleMedium2");
   style.setShowColumnStripes(false);
   style.setShowRowStripes(true);

   //this sets auto filters
   dataTable.getCTTable().addNewAutoFilter().setRef(tableArea.formatAsString());

   workbook.write(fileout);
  }

 }
}