Question

我创建了一个'ResetOnCloseInputStream'，它扩展了BufferedInputStream，因为我将它传递给WorkbookFactory.create（InputStream）并在读取工作簿后关闭了流，而我需要再次使用该流。 ResetOnInputStream看起来像这样 -

public class ResetOnCloseInputStream extends BufferedInputStream {

private final InputStream decorated;

public ResetOnCloseInputStream(InputStream anInputStream) {
    super(anInputStream);
    if (!anInputStream.markSupported()) {
        throw new IllegalArgumentException("marking not supported");
    }

    anInputStream.mark( 1 << 24); // magic constant: BEWARE
    decorated = anInputStream;
}

@Override
public void close() throws IOException {
    decorated.reset();
}
public void realClose() throws IOException {
    decorated.close();
}

@Override
public int read() throws IOException {
    return decorated.read();
}
}

但是当它传递给

时

workbook = WorkbookFactory.create(stream);

我收到此错误 -

Caused by: java.io.IOException: Stream closed
at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:145)
at java.io.BufferedInputStream.read(BufferedInputStream.java:308)

Answer 1

您指定的课程ResetOnCloseInputStream不会给我带来例外

    File inputFile = new File("C:/Test/Test.xls");
    FileInputStream fileInput;
    try {
        fileInput = new FileInputStream(inputFile);
        BufferedInputStream bufferInput = new ResetOnCloseInputStream(new BufferedInputStream(fileInput));
        Workbook workbook = WorkbookFactory.create(bufferInput);
        Sheet s1 = workbook.getSheetAt(0);
        System.out.println(s1.getSheetName()); //Sheet1
    } catch (IOException | EncryptedDocumentException | InvalidFormatException e) {
        e.printStackTrace();
    }

我想问题可能出在您创建的InputStream stream上，它可能在传递给WorkbookFactory.create(bufferInput)之前已关闭。

在WorkbookFactory.create（流）Apache POI中关闭流

1 个答案: