Excel 使用 Java Apache POI 格式化

Question

我有一个 excel 文件，格式如下：

我想重组此格式并输出为以下格式：

这些部分是重复的，可以以任何顺序出现，但它们将采用任一格式。 'Check' 列有时跨行合并，如图所示。

我怎样才能做到这一点？

Answer 1

我使用Guava's Table作为数据结构来省去重新发明轮子

一些注意事项；

矩阵或主元可能有一些数学技巧表或函数式编程可以用很多东西做同样的工作更少的代码。
我不确定我是否为此使用了最新最好的 POI 类
我已经尝试了蛮力和许多数据迭代，但希望它应该很容易理解。
我假设您确定范围是可行的定义数据的单元格数量（ABC、XYZ 等）
我猜合并区域的第一行第一列总是包含实际值（我不知道是否总是这样）
可以使用 final 变量等轻松优化代码


import com.google.common.collect.HashBasedTable;
import com.google.common.collect.Table;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;

public class ExcelFormatting {

    public static void main(String[] args) throws IOException {
        FileInputStream file = new FileInputStream(new File("Data.xls"));
        HSSFWorkbook workbook = new HSSFWorkbook(file);
        HSSFSheet sheet = workbook.getSheetAt(0);
        // ABC - Range A3:F7 in Data.xls
        Table<Integer, Integer, String> abc = getValues(sheet, 2, 0, 6, 5);
        //displayTable(abc);
        // XYZ - Range A11:E14 in Data.xls
        Table<Integer, Integer, String> xyz = getValues(sheet, 10, 0, 13, 4);
        //displayTable(xyz);

        Table<Integer, Integer, String> results = HashBasedTable.create();
        // Headers
        results.put(0, 0, "Name");
        results.put(0, 1, "Section");
        results.put(0, 2, "Check");
        results.put(0, 3, "Cat");
        results.put(0, 4, "Value");
        // Process ABC table
        results.putAll(transform(abc, "ABC", results.rowMap().size()));
        // Process XYZ table        
        results.putAll(transform(xyz, "XYZ", results.rowMap().size()));
        displayTable(results);
    }


    private static Table<Integer, Integer, String> transform(Table<Integer, Integer, String> table, String section, int offset) {
        Table<Integer, Integer, String> results = HashBasedTable.create();
        int maxRows = table.rowMap().size();
        int maxCols = table.columnMap().size();
        // First col is Name
        String name;
        // Second col is Check
        String check;
        String catA, catB, catC, catD = null;
        // offset is added so that table putAll doesn't overlap data rather than append it
        int outputRow = 0 + offset;
        for (int r = 0; r < maxRows; r++) {
            name = table.get(r, 0);
            check = table.get(r, 1);
            if (check == null) {
                check = "";
            }
            catA = table.get(r, 2);
            catB = table.get(r, 3);
            catC = table.get(r, 4);
            if (maxCols == 6) {
                catD = table.get(r, 5);
            }
            if (catA != null) {
                results = addRow(results, outputRow, name, section, check, "A", catA);
                outputRow++;
            }
            if (catB != null) {
                results = addRow(results, outputRow, name, section, check, "B", catB);
                outputRow++;
            }
            if (catC != null) {
                results = addRow(results, outputRow, name, section, check, "C", catC);
                outputRow++;
            }
            if (catD != null) {
                results = addRow(results, outputRow, name, section, check, "D", catD);
                outputRow++;
            }
        }
        return results;
    }

    private static Table<Integer, Integer, String> addRow(Table<Integer, Integer, String> table, int row, String name, String section, String check, String category, String value) {
        table.put(row, 0, name);
        table.put(row, 1, section);
        table.put(row, 2, check);
        table.put(row, 3, category);
        table.put(row, 4, value);
        return table;
    }

    // Convert "merged" data into normal populated cells
    private static Table<Integer, Integer, String> getValues(Sheet sheet, int minRow, int minCol, int maxRow, int maxCol) {
        Table<Integer, Integer, String> table = HashBasedTable.create();
        String result;
        Row row;
        Cell col;
        int r = minRow;
        int c;
        while (r <= maxRow) {
            row = sheet.getRow(r);
            c = minCol;
            while (c <= maxCol) {
                col = row.getCell(c);
                result = getValue(sheet, row, col);
                if (result != null) {
                    table.put(r - minRow, c - minCol, result);
                }
                c++;
            }
            r++;
        }
        return table;
    }

    private static String getValue(Sheet sheet, Row row, Cell cell) {
        String result = getCellValue(cell);
        if (result == null) {
            result = getMergedAreaValue(sheet, row.getRowNum(), cell.getColumnIndex());
        }
        return result;
    }

    private static String getCellValue(Cell cell) {
        String result = null;
        if (Cell.CELL_TYPE_STRING == cell.getCellType()) {
            result = cell.getStringCellValue();
        }
        if (Cell.CELL_TYPE_NUMERIC == cell.getCellType()) {
            result = cell.getNumericCellValue() + "";
        }
        return result;
    }

    private static String getMergedAreaValue(Sheet sheet, int row, int col) {
        int mergedAreas = sheet.getNumMergedRegions();
        CellRangeAddress mergeArea;
        for (int i = 0; i < mergedAreas; i++) {
            mergeArea = sheet.getMergedRegion(i);
            if (mergeArea.isInRange(row, col)) {
                return getCellValue(
                        sheet.getRow(mergeArea.getFirstRow())
                        .getCell(mergeArea.getFirstColumn()));
            }
        }
        return null;
    }

    private static void displayTable(Table<Integer, Integer, String> table) {
        int maxRows = table.rowMap().size();
        int maxCols = table.columnMap().size();
        StringBuilder sb = new StringBuilder();
        String val;
        for (int r = 0; r < maxRows; r++) {
            for (int c = 0; c < maxCols; c++) {
                val = table.get(r, c);
                if (val != null) {
                    sb.append(val);
                }
                sb.append("\t\t");
            }
            sb.append('\n');
        }
        System.out.println(sb.toString());
    }


}

这应该会产生以下输出：

Name    Sect    Check   Cat     Value       
QQQ     ABC             A       1.0     
QQQ     ABC             D       5.0     
WWW     ABC     X       B       2.0     
WWW     ABC     X       D       5.0     
EEE     ABC     X       C       3.0     
EEE     ABC     X       C       4.0     
RRR     ABC             D       6.0     
QQQ     XYZ             A       1.0     
QQQ     XYZ             C       4.0     
WWW     XYZ     X       B       2.0     
WWW     XYZ     X       C       4.0     
WWW     XYZ     X       B       3.0     
WWW     XYZ     X       C       4.0     
EEE     XYZ     X       C       4.0

Answer 2

您应该参考下面 link.It 包含可以使用 apache poi 完成的所有类型的事情 api.Its 的文档。

https://poi.apache.org/spreadsheet/quick-guide.html

Excel 使用 Java Apache POI 格式化

Excel formatting with Java Apache POI

java

excel

formatting

apache-poi