使用Commons-compression读取Java中的tar.gz [英] Read tar.gz in Java with Commons-compression

问题描述

好，所以我想读取tar.gz文件(或xy)的内容，但这是同一回事. 我正在做的或多或少是这样的:

Ok so I want to read the contents of a tar.gz file (or a xy) but that's the same thing. What I am doing is more or less this:

TarArchiveInputStream tarInput = new TarArchiveInputStream(new GzipCompressorInputStream(new FileInputStream("c://temp//test.tar.gz")));
TarArchiveEntry currentEntry = tarInput.getNextTarEntry();
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
while (currentEntry != null) {
    File f = currentEntry.getFile();
    br = new BufferedReader(new FileReader(f));
    System.out.println("For File = " + currentEntry.getName());
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println("line="+line);
    }
}
if (br!=null) {
    br.close();
}

但是当我调用TarArchiveEntry的getFile方法时，我得到的是null.
我正在使用Apache Commons compress 1.8.1

But I get null when I call the getFile method of TarArchiveEntry.
I am using Apache commons compress 1.8.1

推荐答案

您不能使用TarArchiveEntry的getFile.当您压缩tar文件中的文件时，该吸气剂仅用于相反的操作.

You can't use the getFile of TarArchiveEntry. That getter is there only for the opposite operation, when you are compressing files inside a tar file.

相反，您应该直接从TarArchiveInputStream阅读.它将负责向您返回动态解压缩的文件"内容.

Instead, you should read directly from TarArchiveInputStream. It will take care of returning you the content of the "file" decompressing it on the fly.

例如(未经测试的代码，YMMV):

For example (untested code, YMMV) :

TarArchiveInputStream tarInput = new TarArchiveInputStream(new GzipCompressorInputStream(new FileInputStream("c://temp//test.tar.gz")));
TarArchiveEntry currentEntry = tarInput.getNextTarEntry();
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
while (currentEntry != null) {
    br = new BufferedReader(new InputStreamReader(tarInput)); // Read directly from tarInput
    System.out.println("For File = " + currentEntry.getName());
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println("line="+line);
    }
    currentEntry = tarInput.getNextTarEntry(); // You forgot to iterate to the next file
}

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