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这里使用apache commons compress对.tar.Z格式文件进行解压。
对于一个文件test.tar.Z，我们可以将解压过程理解为：
将test.tar.Z解压为test.tar；
将test.tar解压为test。
解压.Z文件示例：
InputStream fin = Files.newInputStream(Paths.get("archive.tar.Z"));
BufferedInputStream in = new BufferedInputStream(fin);
OutputStream out = Files.newOutputStream(Paths.get("archive.tar"));
ZCompressorInputStream zIn = new ZCompressorInputStream(in);
final byte[] buffer = new byte[buffersize];
int n = 0;
while (-1 != (n = zIn.read(buffer))) {
out.write(buffer, 0, n);
}
out.close();
zIn.close();
解压tar文件示例：
Adding an entry to a tar archive:
TarArchiveEntry entry = new TarArchiveEntry(name);
entry.setSize(size);
tarOutput.putArchiveEntry(entry);
tarOutput.write(contentOfEntry);
tarOutput.closeArchiveEntry();
Reading entries from an tar archive:
TarArchiveEntry entry = tarInput.getNextTarEntry();
byte[] content = new byte[entry.getSize()];
LOOP UNTIL entry.getSize() HAS BEEN READ {
tarInput.read(content, offset, content.length - offset);
}
apache commons compress的maven地址如下：
org.apache.commons
commons-compress
1.16.1
测试程序：
package test;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.z.ZCompressorInputStream;
import org.apache.commons.compress.utils.IOUtils;
public class TestUncompressTarZ {
public static void compressTest() throws IOException {
// 将tar.Z解压为tar
System.out.println("uncompress tar.Z to tar...");
InputStream fin = Files.newInputStream(Paths.get("D:\\test.tar.Z"));
BufferedInputStream in = new BufferedInputStream(fin);
OutputStream out = Files.newOutputStream(Paths.get("D:\\test.tar"));
ZCompressorInputStream zIn = new ZCompressorInputStream(in);
byte[] buffer = new byte[1024];
int n = 0;
while (-1 != (n = zIn.read(buffer))) {
out.write(buffer, 0, n);
}
out.close();
zIn.close();
System.out.println("uncompress tar.Z to tar finished!");
// 将tar解压为文件夹
System.out.println("uncompress tar to directory file...");
List fileNames = new ArrayList();
InputStream inputStream = new FileInputStream(new File("D:\\test.tar"));
TarArchiveInputStream tarIn = new TarArchiveInputStream(inputStream, 1024);
TarArchiveEntry entry = null;
while ((entry = tarIn.getNextTarEntry()) != null) {
System.out.println("... " + entry.getName() + " , " + entry.isDirectory());
fileNames.add(entry.getName());
if (entry.isDirectory()) {//是目录
File tmpDir = new File("D:\\test\\" + entry.getName());
if (tmpDir.exists() == false) {
tmpDir.mkdirs();
}
} else {//是文件
File tmpFile = new File("D:\\test\\" + entry.getName());
File tmpDir = tmpFile.getParentFile();
System.out.println("parent: " + tmpDir.getAbsolutePath());
if (tmpDir.exists() == false) {
tmpDir.mkdirs();
}
OutputStream outputStream = new FileOutputStream(tmpFile);
int length = 0;
byte[] b = new byte[1024];
while ((length = tarIn.read(b)) != -1) {
outputStream.write(b, 0, length);
}
}
}
IOUtils.closeQuietly(tarIn);
System.out.println("uncompress tar to directory file finished!");
System.out.println("all finished!");
}
public static void main(String[] args) throws IOException {
compressTest();
}
}
在这个测试程序中，首先将test.tar.Z解压为test.tar，然后将test.tar解压为一个名为test的文件。