如何打印带有Java的tar.gz文件的内容？ [英] How to print the content of a tar.gz file with Java?

问题描述

我必须实现允许打印tar.gz文件中所有文件内容的应用程序。

I have to implement an application that permits printing the content of all files within a tar.gz file.

例如：

if我在一个名为testx的文件夹中有三个文件：

A.txt包含God Save the Queen字样

B.txt包含Ubi maior，minor cessat

C.txt.gz是一个使用gzip压缩的文件，其中包含带有Hello America !!字样的文件c.txt。

For Example:
if I have three files like this in a folder called testx:
A.txt contains the words "God Save The queen"
B.txt contains the words "Ubi maior, minor cessat"
C.txt.gz is a file compressed with gzip that contain the file c.txt with the words "Hello America!!"

所以我压缩testx，获得压缩的tar文件：testx.tar.gz。

So I compress testx, obtain the compressed tar file: testx.tar.gz.

所以我的Java应用程序我想在控制台打印：

God Save the Queen

Ubi maior，minor cessat

Hello America !!

So with my Java application I would like to print in the console:
"God Save The queen"
"Ubi maior, minor cessat"
"Hello America!!"

我实现了ZIP版本，它工作得很好，但保持tar库从apache蚂蚁 http：//commons.apache .org / compress / ，我注意到它不容易像ZIP java utils。

I have implemented the ZIP version and it works well, but keeping tar library from apache ant http://commons.apache.org/compress/, I noticed that it is not easy like ZIP java utils.

有人可以帮助我吗？

我已经开始在网络上了解如何完成我的目标，所以我有以下代码：

I have started looking on the net to understand how to accomplish my aim, so I have the following code:

GZIPInputStream gzipInputStream=null;
gzipInputStream = new GZIPInputStream( new FileInputStream(fileName));
TarInputStream is =  new TarInputStream(gzipInputStream);
TarEntry entryx = null;

while((entryx = is.getNextEntry()) != null) {
    if (entryx.isDirectory()) continue;
    else {
        System.out.println(entryx.getName());
        if ( entryx.getName().endsWith("txt.gz")){
            is.copyEntryContents(out);
            // out is a OutputStream!! 
        }
    }
}

c $ c> is.copyEntryContents（out），可以保存一个文件流传递OutputStream，但我不想要它！在保存第一个条目ZipEntry之后的zip版本中，我们可以从压缩的根文件夹testx.tar.gz中提取流，然后创建一个新的ZipInputStream并使用它来获取内容。

So in the line is.copyEntryContents(out), it is possible to save on a file the stream passing an OutputStream, but I don't want it! In the zip version after keeping the first entry, ZipEntry, we can extract the stream from the compressed root folder, testx.tar.gz, and then create a new ZipInputStream and play with it to obtain the content.

可以使用tar.gz文件吗？

Is it possible to do this with the tar.gz file?

谢谢。

推荐答案

在网上冲浪，我遇到了一个有趣的想法： http://hype-free.blogspot.com/2009/10/using-tarinputstream-from-java.html 。

surfing the net, i have encountered an interesting idea at : http://hype-free.blogspot.com/2009/10/using-tarinputstream-from-java.html.

在将我们的TarEntry转换为Stream之后，我们可以采用与Zip文件相同的想法：

After converting ours TarEntry to Stream, we can adopt the same idea used with Zip Files like:

InputStream tmpIn = new StreamingTarEntry(is,  entryx.getSize());
// use BufferedReader to get one line at a time
BufferedReader gzipReader = new BufferedReader(
                       new InputStreamReader(
                        new GZIPInputStream(
                        inputZip )));

while (gzipReader.ready()) { System.out.println(gzipReader.readLine()); }
gzipReader.close();

使用此代码，您可以打印文件的内容testx.tar.gz ^ _ ^

SO with this code you could print the content of the file testx.tar.gz ^_^

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