Decompress (extract) .tgz file in Java

To handle .tgz file, here is a method to handle it in java like handle Zip file.
Use GZIPInputStream to read .tgz file.

Use TarInputStream to read the the GZIPInputStream.

Therefore we can get TarEntry and handle the .tgz file.

Here is an example that we would like to get file named version in a .tgz file.

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;

import org.apache.tools.tar.TarEntry;
import org.apache.tools.tar.TarInputStream;

public class GZipTest {

 public static void main(String[] args) {
  byte[] buffer = new byte[1024];
  String fileSorce = "/Users/Desktop/testgzip.tgz";

  try {
   // get the zip file content
   TarInputStream zis = new TarInputStream(new GZIPInputStream(
     new FileInputStream(new File(fileSorce))));
   // get the zipped file list entry
   TarEntry ze = zis.getNextEntry();

   while (ze != null) {
    String fileName = ze.getName();
    if (fileName.contains("version")) {
     StringBuffer strBuffer = new StringBuffer();
     while (zis.read(buffer) > 0) {
      strBuffer.append(new String(buffer));
     }
     System.out.println(strBuffer.toString());
    }
    ze = zis.getNextEntry();
   }

   zis.close();
  } catch (IOException e) {
   System.out.println(e);
  }
 }
}

在Eclipse建立Maven專案

1. 建立Maven 專案
new->project->Maven->Maven project
選擇 "maven-archetype-quickstart"
按next，
GroupId 可說是 package的意思
ArtifactId 可說是 project的意思

2. pom.xml 增加 dependency，在 dependencies 裡增加
增加：s2h.util.jmsStub(與MQ溝通的library)
s2h.util.JsonUtils(建立Json格式的library)

3. 為了使Maven能找到s2h自己的 jmsStub和JsonUtils的dependency，要增加repositories
在pom.xml project結束之前

4. 存檔，等程式跑完。