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使用 Apache POI 将工作表附加到 Excel 文件 - NullPointerException 引起的 POIXMLException

这是我的代码:

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.xssf.usermodel.*;

public class testingsyncclass {
    public static void main(String[] args) throws IOException, InvalidFormatException{
        writeParametersTableToFile("C:/ENTERPRISE_TESTING", "XLSX_TEST", "SHEETNAME");
    }

    public static void writeParametersTableToFile(String fileLocation, String fileName, String tableLocator) throws InvalidFormatException{
        String[] columnHeaders = {"What", "is", "a", "computer", "?"};
        ArrayList<Object[]> xlsxFileData = new ArrayList<Object[]>();
        for(int i = 0; i < 10; i++){
            Object[] o = {"CoffeeCup", "AnglerJS", "Emerald", "C?", "C--"};
            xlsxFileData.add(o);
        }
        try{
            if(fileName.contains(".xlsx")){
                fileName = fileName.replaceAll(".xlsx", "");
            }
            File file …
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java excel nullpointerexception apache-poi

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