无法为我的 Excel 阅读工作获取 Apache POI

Question

我正在尝试将此基本布局用于可以读取 Excel 文件的程序。我想扩展的不仅仅是这段代码，但出于某种原因，每次构建代码时，我都会收到错误消息“注意：C:\Users\Ryan Kabir\Documents\NetBeansProjects\ExcelReader\src\excelreader\ExcelReader.java 使用或覆盖了已弃用的 API。注意：使用 -Xlint:deprecation 重新编译以获得详细信息。”我尝试使用 javac -Xlint:deprecation ExcelReader.java 进行编译，但我找不到不推荐使用的方法。不是我的测试 excel 文件只是一个 3x6 table.

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
 
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.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
/**
 * A dirty simple program that reads an Excel file.
 * @author www.codejava.net
 *
 */
public class ExcelReader {
     
    public static void main(String[] args) throws IOException {
        String excelFilePath = "Books.xlsx";
        FileInputStream inputStream = new FileInputStream(new File(excelFilePath));
         
        Workbook workbook = new XSSFWorkbook(inputStream);
        Sheet firstSheet = workbook.getSheetAt(0);
        Iterator<Row> iterator = firstSheet.iterator();
         
        while (iterator.hasNext()) {
            Row nextRow = iterator.next();
            Iterator<Cell> cellIterator = nextRow.cellIterator();
             
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();
                 
                switch (cell.getCellType()) {
                    case Cell.CELL_TYPE_STRING:
                        System.out.print(cell.getStringCellValue());
                        break;
                    case Cell.CELL_TYPE_BOOLEAN:
                        System.out.print(cell.getBooleanCellValue());
                        break;
                    case Cell.CELL_TYPE_NUMERIC:
                        System.out.print(cell.getNumericCellValue());
                        break;
                }
                System.out.print(" - ");
            }
            System.out.println();
        }
         
        workbook.close();
        inputStream.close();
    }

}

Answer 1

Cell.getCellType as well as all the fields in Cell are deprecated. Use Cell.getCellTypeEnum and CellType instead as shown in Getting the cell contents.

由于

需要稍微改动一下

error: an enum switch case label must be the unqualified name of an enumeration constant
     case CellType.STRING:

但以下应该有效：

import org.apache.poi.ss.usermodel.CellType;
...
            switch (cell.getCellTypeEnum()) { //up to apache poi version 3.17
            //switch (cell.getCellType()) { //using apache poi version 4.0.0 upwards

                case STRING:
                    System.out.println(cell.getRichStringCellValue().getString());
                    break;
                case NUMERIC:
                    if (DateUtil.isCellDateFormatted(cell)) {
                        System.out.println(cell.getDateCellValue());
                    } else {
                        System.out.println(cell.getNumericCellValue());
                    }
                    break;
                case BOOLEAN:
                    System.out.println(cell.getBooleanCellValue());
                    break;
                case FORMULA:
                    System.out.println(cell.getCellFormula());
                    break;
                case BLANK:
                    System.out.println();
                    break;
                default:
                    System.out.println();
            }
...

阅读Busy Developers' Guide to HSSF and XSSF Features总是好的。

从 apache poi 版本 4.0.0 现在向上 Cell.getCellType returns CellType。所以使用这些版本我们现在需要使用这种方法。

无法为我的 Excel 阅读工作获取 Apache POI

Cannot get Apache POI for my Excel reading to work

java

excel

apache-poi

deprecation-warning