如何使用apache poi将数据写入现有的Excel

Question

我的Excel工作表包含5行和2列.我想在excel中再添加一列.但是当我使用WorkbookFactory时,它显示错误.我导入了poi-3.8.jar和poi-ooxml-3.5-beta5.jar .它在线程"main"java.lang.Error中给出错误异常:未解决的编译问题:无法解析WorkbookFactory.请帮我做什么.

Answer 1

try this


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;

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.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelExample {

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

        try {

            FileInputStream file = new FileInputStream(new File("C:\\test.xls"));

            HSSFWorkbook workbook = new HSSFWorkbook(file);
            HSSFSheet sheet = workbook.getSheetAt(0);
            Cell cell = null;

            //Update the value of cell
            cell = sheet.getRow(1).getCell(2);
            cell.setCellValue(cell.getNumericCellValue() * 2);
            cell = sheet.getRow(2).getCell(2);
            cell.setCellValue(cell.getNumericCellValue() * 2);
            Row row = sheet.getRow(0);
            row.createCell(3).setCellValue("Value 2");

            file.close();

            FileOutputStream outFile =new FileOutputStream(new File("C:\\update.xls"));
            workbook.write(outFile);
            outFile.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}