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如何使用 Apache POI 打开 2007 xlsx ooxml 文件？我已将所有内容添加到我的类路径中，但不断收到此java.lang.NullPointerException错误：

"C:\Program Files\Java\jdk1.7.0_13\bin\java" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:1804,suspend=y,server=n -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_13\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.7.0_13\jre\lib\ext\zipfs.jar;C:\Users\Patrick\Desktop\xmlChanger\out\production\xmlChanger;C:\poi-3.9\poi-3.9-20121203.jar;C:\poi-3.9\poi-examples-3.9-20121203.jar;C:\poi-3.9\poi-excelant-3.9-20121203.jar;C:\poi-3.9\poi-ooxml-3.9-20121203.jar;C:\poi-3.9\poi-ooxml-schemas-3.9-20121203.jar;C:\poi-3.9\poi-scratchpad-3.9-20121203.jar;C:\poi-3.9\lib\commons-codec-1.5.jar;C:\poi-3.9\lib\commons-logging-1.1.jar;C:\poi-3.9\lib\junit-3.8.1.jar;C:\poi-3.9\lib\log4j-1.2.13.jar;C:\poi-3.9\ooxml-lib\dom4j-1.6.1.jar;C:\poi-3.9\ooxml-lib\stax-api-1.0.1.jar;C:\poi-3.9\ooxml-lib\xmlbeans-2.3.0.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 12.0.1\lib\idea_rt.jar" Main
Connected to the target VM, address: '127.0.0.1:1804', transport: 'socket'
java.lang.NullPointerException
    at org.apache.poi.openxml4j.opc.OPCPackage.getPart(OPCPackage.java:625)
    at org.apache.poi.POIXMLDocumentPart.<init>(POIXMLDocumentPart.java:91)
    at org.apache.poi.POIXMLDocument.<init>(POIXMLDocument.java:56)
    at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:183)
    at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:73)
    at Main.main(Main.java:178)
Disconnected from the target VM, address: '127.0.0.1:1804', transport: 'socket'

Process finished with exit code 0

我的代码如下：

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.ss.usermodel.WorkbookFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.File;
import java.util.Iterator;

public class Main {
    public static void main(String[] args) {
        try {

            File file = new File(root_dir + "2013-03-13 iom diff.xlsx");
            Workbook workbook = WorkbookFactory.create(file); //fails here

            //...

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

同样，我已经搜索过这个但没有找到任何有效的答案（例如，确保目录路径正确，超出范围等）

我之前问过一个类似的问题，但错误是不同的，因为我相信在 Microsoft Excel 中保存时我只使用了普通的 xlsx 格式而不是 OOXML xlsx 格式。

这个空指针异常来自哪里的任何想法或使抛出的异常更有意义的方法？

编辑

当我使用以下代码创建工作簿时，它会打开上面发布的代码：

        Workbook wb = new XSSFWorkbook();
        CreationHelper createHelper = wb.getCreationHelper();
        Sheet sheet = wb.createSheet("new sheet");


        Row r = sheet.createRow((short) 0);

        Cell cell = r.createCell(0);
        cell.setCellValue(1);


        r.createCell(1).setCellValue(1.2);
        r.createCell(2).setCellValue(createHelper.createRichTextString("This is a string"));
        r.createCell(3).setCellValue(true);

        // Write the output to a file
        FileOutputStream fileOut = new FileOutputStream("workbook.xlsx");
        wb.write(fileOut);
        fileOut.close();

这意味着格式无效，但我不确定交易是什么，因为我在 Excel 中保存为 OOXML

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0 回答 0