提取的java .tar.gz文件(JSP)(Extract a .tar.gz file in j

2019-07-18 09:41发布

我似乎无法导入所需的包或找到如何提取任何网上的例子.tar.gz的Java文件。

是什么使得它更糟糕的是我使用的JSP页面时遇到了问题导入包到我的项目。 我复制的.jar的到WebContent/WEB-INF/lib/然后用鼠标右键单击该项目,并选择导入外部JAR和进口它。 有时,包解决,其他时间他们不这样做。 似乎无法得到GZIP导入无论是。 对于JSP Eclipse中的进口不直观,就像他们在正常的Java代码,你可以右键单击一个公认的包,然后选择导入。

我已经试过了Apache公共图书馆,冰和另外一个叫联合战术空中攻击。 冰已经进口的,但我无法找到如何使用它的例子吗?

我想我需要先解压缩gzip压缩部分,然后用tarstream打开呢?

任何帮助是极大的赞赏。

Answer 1:

该接受的答案工作正常,但我认为这是多余的有写文件操作。

你可以使用像

 TarArchiveInputStream tarInput = 
      new TarArchiveInputStream(new GZipInputStream(new FileInputStream("Your file name")));

 TarArchiveEntry currentEntry = tarInput.getNextTarEntry();
 while(currentEntry != null) {
      File f = currentEntry.getFile();
      // TODO write to file as usual
 }

希望这有助于。

Maven的回购



Answer 2:

好吧,我终于想通了这一点,这是我的代码的情况下,这可以帮助任何人的未来。 它用Java编写的,使用Apache公地IO和压缩图书馆的。

File dir = new File("directory/of/.tar.gz/files/here");
File listDir[] = dir.listFiles();
if (listDir.length!=0){
    for (File i:listDir){
        /*  Warning! this will try and extract all files in the directory
            if other files exist, a for loop needs to go here to check that
            the file (i) is an archive file before proceeding */
        if (i.isDirectory()){
            break;
        }
        String fileName = i.toString();
        String tarFileName = fileName +".tar";
        FileInputStream instream= new FileInputStream(fileName);
        GZIPInputStream ginstream =new GZIPInputStream(instream);
        FileOutputStream outstream = new FileOutputStream(tarFileName);
        byte[] buf = new byte[1024]; 
        int len;
        while ((len = ginstream.read(buf)) > 0) 
        {
            outstream.write(buf, 0, len);
        }
        ginstream.close();
        outstream.close();
        //There should now be tar files in the directory
        //extract specific files from tar
        TarArchiveInputStream myTarFile=new TarArchiveInputStream(new FileInputStream(tarFileName));
        TarArchiveEntry entry = null;
        int offset;
        FileOutputStream outputFile=null;
        //read every single entry in TAR file
        while ((entry = myTarFile.getNextTarEntry()) != null) {
            //the following two lines remove the .tar.gz extension for the folder name
            String fileName = i.getName().substring(0, i.getName().lastIndexOf('.'));
            fileName = fileName.substring(0, fileName.lastIndexOf('.'));
            File outputDir =  new File(i.getParent() + "/" + fileName + "/" + entry.getName());
            if(! outputDir.getParentFile().exists()){ 
                outputDir.getParentFile().mkdirs();
            }
            //if the entry in the tar is a directory, it needs to be created, only files can be extracted
            if(entry.isDirectory){
                outputDir.mkdirs();
            }else{
                byte[] content = new byte[(int) entry.getSize()];
                offset=0;
                myTarFile.read(content, offset, content.length - offset);
                outputFile=new FileOutputStream(outputDir);
                IOUtils.write(content,outputFile);  
                outputFile.close();
            }
        }
        //close and delete the tar files, leaving the original .tar.gz and the extracted folders
        myTarFile.close();
        File tarFile =  new File(tarFileName);
        tarFile.delete();
    }
}


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