java - 使用 FileOutputStream 时出现 FileNotFoundException

Question

我需要通过这段代码提取tar文件。但是当我使用 FileOutputStream(outputFile); 时出现此错误；

     " java.io.FileNotFoundException: D:\TestFile\1.png (Access is denied)"

输入是来自驱动器 D:/testFile 的 1.tar 文件并解压到同一文件夹

我尝试通过outputFile.getCanonicalFile检查输出文件的路径，但没问题!怎么了？

   public class DecompressTarFile {

public ArrayList<File> getTarFileExtracted() {
    return tarFileExtracted;
}

public ArrayList<File> tarFileExtracted = new ArrayList<File>();

public DecompressTarFile(File inputFile, File outputDir) throws FileNotFoundException, ArchiveException, IOException {

    System.out.println("Untaring " + inputFile.getAbsolutePath() + " to dir " + outputDir.getAbsolutePath() + ".");
    InputStream inputStream = new FileInputStream(inputFile);
    TarArchiveInputStream tarStream = (TarArchiveInputStream) new ArchiveStreamFactory().createArchiveInputStream("tar", inputStream);
    TarArchiveEntry tarEntry = null;
    while ((tarEntry = (TarArchiveEntry) tarStream.getNextEntry()) != null) {
        File outputFile = new File(outputDir, tarEntry.getName());
        System.out.println("Attempting to write output directory " + outputFile.getAbsolutePath());
        if (!outputFile.exists()) {
            System.out.println("Attempting to create output directory " + outputFile.getAbsolutePath());
            if (!outputFile.mkdirs()) {
                throw new IllegalStateException(String.format("Couldn't create directory %s.", outputFile.getAbsolutePath()));
            }

        } else {
            System.out.println("Create output file " + outputFile.getAbsolutePath());     

            OutputStream outputFileStream = new FileOutputStream(outputFile);
            IOUtils.copy(tarStream, outputFileStream);
            outputFileStream.close();

        }
        tarFileExtracted.add(outputFile);
    }
    tarStream.close();

}

}

并由主类调用

 static File tarFileInput = new File("D:/TestFile/haha.tar");
static File tarPathFileOutput = new File("D:/TestFile");

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

    decomp = new DecompressTarFile(tarFileInput, tarPathFileOutput);
    //listOutput = decomp.getTarFileExtracted();

}

这段代码的结果

   run:
    Untaring D:\TestFile\haha.tar to dir D:\TestFile.
    Attempting to write output directory D:\TestFile\1.png
    Create output file D:\TestFile\1.png
    Exception in thread "main" java.io.FileNotFoundException: D:\TestFile\1.png (Access  is denied)
     at java.io.FileOutputStream.open(Native Method)
     at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
     at java.io.FileOutputStream.<init>(FileOutputStream.java:171)
     at com.service..TarFile.DecompressTarFile.<init>(DecompressTarFile.java:53)
      at com.service..TarFile.MainForTest.main(MainForTest.java:28)

Java 结果:1

Answer 1

这就是问题:

Attempting to write output directory D:\TestFile\1.png

您已将目标文件名创建为目录。您需要将“我需要存在的目录”和“我想要写入的文件”分开。例如:

File outputFile = new File(outputDir, tarEntry.getName());
File outputDirectory = outputFile.getParent();
if (!outputDirectory.exists()) {
    // Try to create the directory
}

哦，还有一个循环条件:

while (tarEntry != null)

...但您没有更改循环中 tarEntry 的值...