使用java错误解压缩tar.gz

Question

我正在尝试使用java解压压缩.tar.gz文件，我得到的目录错误似乎并不理解。请帮忙。我得到这个示例代码从https://forums.oracle.com/forums/thread.jspa?threadID=2065236

package untargz; 
import java.io.*; 
import com.ice.tar.*; 
import javax.activation.*; 
import java.util.zip.GZIPInputStream; 
/** 
* 
* @author stanleymungai 
*/ 
public class Untargz { 
public static InputStream getInputStream(String tarFileName) throws Exception{ 

     if(tarFileName.substring(tarFileName.lastIndexOf(".") + 1, tarFileName.lastIndexOf(".") + 3).equalsIgnoreCase("gz")){ 
     System.out.println("Creating an GZIPInputStream for the file"); 
     return new GZIPInputStream(new FileInputStream(new File(tarFileName))); 

     }else{ 
     System.out.println("Creating an InputStream for the file"); 
     return new FileInputStream(new File(tarFileName)); 
     } 
    } 

    private static void untar(InputStream in, String untarDir) throws IOException { 

     System.out.println("Reading TarInputStream... "); 
     TarInputStream tin = new TarInputStream(in); 
     TarEntry tarEntry = tin.getNextEntry(); 
     if(new File(untarDir).exists()){ 
      while (tarEntry != null){ 
      File destPath = new File(untarDir + File.separatorChar + tarEntry.getName()); 
      System.out.println("Processing " + destPath.getAbsoluteFile()); 
      if(!tarEntry.isDirectory()){ 
       FileOutputStream fout = new FileOutputStream(destPath); 
       tin.copyEntryContents(fout); 
       fout.close(); 
      }else{ 
       destPath.mkdir(); 
      } 
      tarEntry = tin.getNextEntry(); 
      } 
      tin.close(); 
     }else{ 
     System.out.println("That destination directory doesn't exist! " + untarDir); 
     }  
    } 
    private void run(){ 
     try {   
      String strSourceFile = "C:/AskulInstaller/pid.tar.gz"; 
      String strDest = "C:/AskulInstaller/Extracted Files"; 
      InputStream in = getInputStream(strSourceFile); 
      untar(in, strDest);  

     }catch(Exception e) { 

      e.printStackTrace();   
      System.out.println(e.getMessage()); 
     } 
    } 
    public static void main(String[] args) { 
     new Untargz().run(); 
    } 
} 

一旦我运行这段代码，这是我的输出;

Creating an GZIPInputStream for the file 
Reading TarInputStream... 
That destination directory doesn't exist! C:/AskulInstaller/Extracted Files 
BUILD SUCCESSFUL (total time: 0 seconds) 

当我手动创建目标目录C：/ AskulInstaller /解压缩文件

我得到这个错误输出;

Creating an GZIPInputStream for the file 
Reading TarInputStream... 
Processing C:\AskulInstaller\Extracted Files\AskulInstaller\pid\Askul Logs\DbLayer_AskulMain_10_Apr_2013_07_44.log 
java.io.FileNotFoundException: C:\AskulInstaller\Extracted Files\AskulInstaller\pid\Askul Logs\DbLayer_AskulMain_10_Apr_2013_07_44.log (The system cannot find the path specified) 
C:\AskulInstaller\Extracted Files\AskulInstaller\pid\Askul Logs\DbLayer_AskulMain_10_Apr_2013_07_44.log (The system cannot find the path specified) 
    at java.io.FileOutputStream.open(Native Method) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:212) 
    at java.io.FileOutputStream.<init>(FileOutputStream.java:165) 
    at untargz.Untargz.untar(Untargz.java:37) 
    at untargz.Untargz.run(Untargz.java:55) 
    at untargz.Untargz.main(Untargz.java:64) 

有没有一种方法我应该把我的目录，以便提取会发生什么或我的错误是什么？

Answer 1

如果tar文件包含一个文件foo/bar.txt的条目，但不包含foo/那么你的代码将试图创造一个不存在的目录中的文件的先前的目录条目。尝试添加

destFile.getParentFile().mkdirs(); 

就在创建FileOutputStream之前。

或者，如果您不介意将代码视Ant作为库，那么您可以将整个解包过程委托给Ant任务，而不是手工完成。像这样的东西（没有完全测试）：

Project p = new Project(); 
Untar ut = new Untar(); 
ut.setProject(p); 
ut.setSrc(tarFile); 
if(tarFile.getName().endsWith(".gz")) { 
    ut.setCompression((UntarCompressionMethod)EnumeratedAttribute.getInstance(UntarCompressionMethod.class, "gzip")); 
} 
ut.setDest(destDir); 

ut.perform();