我正在尝试使用 Apache POI 3.17 创建一个带有预先选择的特定单元格的旧式 Excel 文档(HSSFWorkbook)。下面的代码真的很丑(它使用反射和私有字段),但可以完成工作。
有没有更好的方法来实现相同的目标?
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import org.apache.poi.hssf.model.InternalSheet;
import org.apache.poi.hssf.record.SelectionRecord;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.CellRangeAddress8Bit;
import org.apache.poi.ss.util.CellAddress;
public class ExcelGeneratorDemo {
public static void main(String[] args) throws IOException {
writeExcelFile("D21");
}
private static void writeExcelFile(String activeCell) throws IOException {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
CellAddress address = new CellAddress(activeCell);
setActiveCell(sheet, address);
wb.write(new File(activeCell + ".xls"));
}
/**
* Calling just {@code sheet.setActiveCell} has no effect when opening
* the file with Microsoft Excel 2016.
*/
private static void setActiveCell(HSSFSheet sheet, CellAddress address) {
sheet.setActiveCell(address);
// Following three private fields in a row cannot be the correct path.
InternalSheet internalSheet = getField(sheet, "_sheet");
SelectionRecord selection = getField(internalSheet, "_selection");
CellRangeAddress8Bit[] ranges = getField(selection, "field_6_refs");
ranges[0].setFirstColumn(address.getColumn());
ranges[0].setLastColumn(address.getColumn());
ranges[0].setFirstRow(address.getRow());
ranges[0].setLastRow(address.getRow());
}
private static <T> T getField(Object obj, String fieldName) {
try {
Field field = obj.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
return (T) field.get(obj);
} catch (ReflectiveOperationException e) {
throw new IllegalStateException(e);
}
}
}
关于 HSSF的类似问题也有一些解决方法代码。它不使用反射,但它的解决方法代码也不是直截了当的。