添加的maven依赖是
<poi.version>3.15</poi.version> ... <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>${poi.version}</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>${poi.version}</version> </dependency>
读取excel中数据的简单写法
import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; public class Test81 { public static void main(String[] args) { try (InputStream is = new FileInputStream("C:\Users\jiashubing\Desktop\aaaa.xls"); Workbook book = new HSSFWorkbook(is);) { Sheet sheet = book.getSheetAt(0); for (int i = 1; i <= sheet.getLastRowNum(); i++) { for (int j = 0; j < 5; j++) { Cell cell = sheet.getRow(i).getCell(j); if (cell != null) { System.out.println(cell.getStringCellValue()); } } } } catch (IOException e) { //return; } } }
这样读取的是xls 格式的文件
把 Workbook 改成用WorkbookFactory 实现,那么就必须是读xlsx文件: Workbook book = WorkbookFactory.create(is);
POI的操作中大量使用了坐标,于是新建了一个类,包含四个参数,代表起始坐标 (firstRow,lastRow) 和结束坐标 (firstCol,lastRow) ,在下面的例子中凡是计算合并单元格的时候都会用到
public class ExcelPositionRange { private int firstRow; private int firstCol; private int lastRow; private int lastCol; public ExcelPositionRange(int firstRow, int firstCol, int lastRow, int lastCol) { this.firstRow = firstRow; this.firstCol = firstCol; this.lastRow = lastRow; this.lastCol = lastCol; } public ExcelPositionRange() { } //... get/set方法 }
获取合并单元格
/** * 获取合并的单元格 */ private static ExcelPositionRange getMergedRegionPositionRange(Cell cell) { Sheet sheet = cell.getSheet(); int row = cell.getRowIndex(); int column = cell.getColumnIndex(); int sheetMergeCount = sheet.getNumMergedRegions(); for (int i = 0; i < sheetMergeCount; ++i) { CellRangeAddress ca = sheet.getMergedRegion(i); int firstColumn = ca.getFirstColumn(); int lastColumn = ca.getLastColumn(); int firstRow = ca.getFirstRow(); int lastRow = ca.getLastRow(); if (row >= firstRow && row <= lastRow && column >= firstColumn && column <= lastColumn) { sheet.getRow(firstRow); return new ExcelPositionRange(firstRow, firstColumn, lastRow, lastColumn); } } return new ExcelPositionRange(row, column, row, column); }
读取单元格数据内容
/** * 读取数据内容(参数可以改为Cell) * * @param sheet Sheet页面 * @param row 行数 * @param column 列数 * @return 读取的内容 */ public static String getMergedRegionValue(Sheet sheet, int row, int column) { int sheetMergeCount = sheet.getNumMergedRegions(); //判断该单元格是否是合并区域的内容 for (int i = 0; i < sheetMergeCount; i++) { CellRangeAddress ca = sheet.getMergedRegion(i); int firstColumn = ca.getFirstColumn(); int lastColumn = ca.getLastColumn(); int firstRow = ca.getFirstRow(); int lastRow = ca.getLastRow(); if (row >= firstRow && row <= lastRow) { if (column >= firstColumn && column <= lastColumn) { Row fRow = sheet.getRow(firstRow); return getStringValue(fRow.getCell(firstColumn)); } } } return getStringValue(sheet.getRow(row).getCell(column)); } /** * 获取单元格中的值,转为String类型 */ private static String getStringValue(Cell cell) { if (cell == null) return ""; //其他数据类型当成字符串读取 cell.setCellType(CellType.STRING); return cell.getStringCellValue(); }
获取单元格的总高、宽度
使用到了“获取合并单元格”那个方法
/** * 获取单元格的总高度(单位:坐标点) */ private static double getTotalHeight(Cell cell) { ExcelPositionRange tmpRange = getMergedRegionPositionRange(cell); double totalHeight = 0; for (int i = tmpRange.getFirstRow(); i <= tmpRange.getLastRow(); i++) { totalHeight += cell.getSheet().getRow(i).getHeightInPoints(); } return totalHeight; } /** * 获取单元格的总宽度(单位:像素) */ private static double getTotalWidth(Cell cell) { ExcelPositionRange tmpRange = getMergedRegionPositionRange(cell); double totalWidthInPixels = 0; for (int i = tmpRange.getFirstCol(); i <= tmpRange.getLastCol(); i++) { totalWidthInPixels += cell.getSheet().getColumnWidthInPixels(i); } return totalWidthInPixels; }
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