使用 Apache POI 更新 Excel 文件
2022-09-02 21:12:21
我正在尝试使用Apache POI更新现有的excel文件。每次我运行代码时,我都会收到一个错误,如下所示。我也尝试过FileInputStreamNewFile的事情。
Exception in thread "main" java.lang.NullPointerException
at com.gma.test.WriteExcelTest.writeXLSXFile(WriteExcelTest.java:26)
at com.gma.test.WriteExcelTest.main(WriteExcelTest.java:44)
请在下面找到代码。感谢您的帮助。
package com.gma.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class WriteExcelTest {
public static void writeXLSXFile(int row, int col) throws IOException {
try {
FileInputStream file = new FileInputStream("C:\\Anuj\\Data\\Data.xlsx");
XSSFWorkbook workbook = new XSSFWorkbook(file);
XSSFSheet sheet = workbook.getSheetAt(0);
Cell cell = null;
//Update the value of cell
cell = sheet.getRow(row).getCell(col);
cell.setCellValue("Pass");
file.close();
FileOutputStream outFile =new FileOutputStream(new File("C:\\Anuj\\Data\\Data.xlsx"));
workbook.write(outFile);
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
writeXLSXFile(3, 3);
}
}