Java - 使用 POI 过滤 Excel 文件的行

Question

我有一个包含很多行(超过 60,000 行)的 Excel 文件，我想对它们应用过滤器以便只读取我要查找的行。

我在 Java 中使用 POI 库，但我没有找到如何过滤值。

例如，我的 Excel 文件中有以下数据:

First name | Last name | Age
-----------+-----------+----
Jhon       | Doe       |  25
Foo        | Bar       |  20
Aaa        | Doe       |  22

如何选择姓氏等于 Doe 的每一行？

到目前为止，这是我的代码:

public void parseExcelFile(XSSFWorkbook myExcelFile) {
    XSSFSheet worksheet = myExcelFile.getSheetAt(1);

    // Cell range to filter
    CellRangeAddress data = new CellRangeAddress(
            1,
            worksheet.getLastRowNum(),
            0,
            worksheet.getRow(0).getPhysicalNumberOfCells());

    worksheet.setAutoFilter(data);
}

我尝试使用 AutoFilter 但我不知道它是如何工作的。

我正在寻找如下所示的功能:

Filter filter = new Filter();
filter.setRange(myRange);
filter.addFilter(
    0, // The column index
    "Doe" // The value that I'm searching for
)
filter.apply()

这纯粹是假设的代码。

感谢您的帮助!

Answer 1

如果您的问题是如何为姓氏设置AutoFilter 标准“Doe”，那么这只能使用底层的低级ooxml-schemas 类来实现。 XSSFAutoFilter 直到现在都没用。直到现在它还没有提供任何方法。

使用您的示例数据的完整示例:

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.*;
import org.apache.poi.xssf.usermodel.*;

import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTAutoFilter;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTFilterColumn;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTFilters;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTCustomFilters;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTCustomFilter;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.STFilterOperator;

import java.io.FileOutputStream;

class AutoFilterSetTest {

 private static void setCellData(Sheet sheet) {

  Object[][] data = new Object[][] {
   new Object[] {"First name", "Last name", "Age"},
   new Object[] {"John", "Doe", 25},
   new Object[] {"Foo", "Bar", 20},
   new Object[] {"Jane", "Doe", 22},
   new Object[] {"Ruth", "Moss", 42},
   new Object[] {"Manuel", "Doe", 32},
   new Object[] {"Axel", "Richter", 56},
  };

  Row row = null;
  Cell cell = null;
  int r = 0;
  int c = 0;
  for (Object[] dataRow : data) {
   row = sheet.createRow(r);
   c = 0;
   for (Object dataValue : dataRow) {
    cell = row.createCell(c);
    if (dataValue instanceof String) {
     cell.setCellValue((String)dataValue);
    } else if (dataValue instanceof Number) {
     cell.setCellValue(((Number)dataValue).doubleValue());
    }
    c++;
   }
   r++;
  }
 }

 private static void setCriteriaFilter(XSSFSheet sheet, int colId, int firstRow, int lastRow, String[] criteria) throws Exception {
  CTAutoFilter ctAutoFilter = sheet.getCTWorksheet().getAutoFilter();
  CTFilterColumn ctFilterColumn = null;
  for (CTFilterColumn filterColumn : ctAutoFilter.getFilterColumnList()) {
   if (filterColumn.getColId() == colId) ctFilterColumn = filterColumn;
  }
  if (ctFilterColumn == null) ctFilterColumn = ctAutoFilter.addNewFilterColumn();
  ctFilterColumn.setColId(colId);
  if (ctFilterColumn.isSetFilters()) ctFilterColumn.unsetFilters();

  CTFilters ctFilters = ctFilterColumn.addNewFilters();
  for (int i = 0; i < criteria.length; i++) {
   ctFilters.addNewFilter().setVal(criteria[i]);
  }

  //hiding the rows not matching the criterias
  DataFormatter dataformatter = new DataFormatter();
  for (int r = firstRow; r <= lastRow; r++) {
   XSSFRow row = sheet.getRow(r);
   boolean hidden = true;
   for (int i = 0; i < criteria.length; i++) {
    String cellValue = dataformatter.formatCellValue(row.getCell(colId));
    if (criteria[i].equals(cellValue)) hidden = false;
   }
   if (hidden) {
    row.getCTRow().setHidden(hidden);
   } else {
    if (row.getCTRow().getHidden()) row.getCTRow().unsetHidden();
   }
  }
 }

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

  XSSFWorkbook wb = new XSSFWorkbook();
  XSSFSheet sheet = wb.createSheet();

  //create rows of data
  setCellData(sheet);

  for (int c = 0; c < 2; c++) sheet.autoSizeColumn(c);

  int lastRow = sheet.getLastRowNum();
  XSSFAutoFilter autofilter = sheet.setAutoFilter(new CellRangeAddress(0, lastRow, 0, 2));
  //XSSFAutoFilter is useless until now

  //set filter criteria 
  setCriteriaFilter(sheet, 1, 1, lastRow, new String[]{"Doe"});

  //get only visible rows after filtering
  XSSFRow row = null;
  for (int r = 1; r <= lastRow; r++) {
   row = sheet.getRow(r);
   if (row.getCTRow().getHidden()) continue;
   for (int c = 0; c < 3; c++) {
    System.out.print(row.getCell(c) + "\t");
   }
   System.out.println();
  }

  FileOutputStream out = new FileOutputStream("AutoFilterSetTest.xlsx");
  wb.write(out);
  out.close();
  wb.close();
 }
}

它打印:

John    Doe   25.0  
Jane    Doe   22.0  
Manuel  Doe   32.0  

生成的 AutoFilterSetTest.xlsx 如下所示: