我似乎无法导入所需的软件包或找到有关如何在java中提取.tar.gz
文件的任何在线示例。
更糟糕的是我正在使用JSP页面并且无法将包导入我的项目中。我正在将.jar复制到WebContent/WEB-INF/lib/
,然后右键单击项目并选择导入外部jar并导入它。有时包解析,有时则不解决。似乎无法让GZIP导入。 eclipse中对jsp的导入并不像普通的Java代码那样直观,您可以在其中右键单击已识别的包并选择导入。
我尝试过Apache commons库,另一个叫做JTar。 Ice已导入,但我找不到任何如何使用它的例子?
我想我需要首先解压缩gzip压缩部分,然后用tarstream打开它?
非常感谢任何帮助。
答案 0 :(得分:16)
接受的答案很好,但我认为写文件操作是多余的。
您可以使用类似
的内容 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
}
希望得到这个帮助。
答案 1 :(得分:5)
好的,我终于弄明白了,这是我的代码,以防将来有人帮助。 它用Java编写,使用apache commons io和compress librarys。
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();
}
}