1、.gz文件是linux下常见的压缩格式。使用 java.util.zip.GZIPInputStream即可，压缩是 java.util.zip.GZIPOutputStream
public static void unGzipFile(String sourcedir) {
String ouputfile = "";
try {
//建立gzip压缩文件输入流
FileInputStream fin = new FileInputStream(sourcedir);
//建立gzip解压工作流
GZIPInputStream gzin = new GZIPInputStream(fin);
//建立解压文件输出流
ouputfile = sourcedir.substring(0,sourcedir.lastIndexOf('.'));
ouputfile = ouputfile.substring(0,ouputfile.lastIndexOf('.'));
FileOutputStream fout = new FileOutputStream(ouputfile);
int num;
byte[] buf=new byte[1024];
while ((num = gzin.read(buf,0,buf.length)) != -1)
{
fout.write(buf,0,num);
}
gzin.close();
fout.close();
fin.close();
} catch (Exception ex){
System.err.println(ex.toString());
}
return;
}2、zip文件，使用java.util.zip.ZipEntry 和 java.util.zip.ZipFile
/**
* 解压缩zipFile
* @param file 要解压的zip文件对象
* @param outputDir 要解压到某个指定的目录下
* @throws IOException
*/
public static void unZip(File file,String outputDir) throws IOException {
ZipFile zipFile = null;
try {
Charset CP866 = Charset.forName("CP866"); //specifying alternative (non UTF-8) charset
//ZipFile zipFile = new ZipFile(zipArchive, CP866);
zipFile = new ZipFile(file, CP866);
createDirectory(outputDir,null);//创建输出目录
Enumeration<?> enums = zipFile.entries();
while(enums.hasMoreElements()){
ZipEntry entry = (ZipEntry) enums.nextElement();
System.out.println("解压." + entry.getName());
if(entry.isDirectory()){//是目录
createDirectory(outputDir,entry.getName());//创建空目录
}else{//是文件
File tmpFile = new File(outputDir + "/" + entry.getName());
createDirectory(tmpFile.getParent() + "/",null);//创建输出目录
InputStream in = null;
OutputStream out = null;
try{
in = zipFile.getInputStream(entry);;
out = new FileOutputStream(tmpFile);
int length = 0;
byte[] b = new byte[2048];
while((length = in.read(b)) != -1){
out.write(b, 0, length);
}
}catch(IOException ex){
throw ex;
}finally{
if(in!=null)
in.close();
if(out!=null)
out.close();
}
}
}
} catch (IOException e) {
throw new IOException("解压缩文件出现异常",e);
} finally{
try{
if(zipFile != null){
zipFile.close();
}
}catch(IOException ex){
throw new IOException("关闭zipFile出现异常",ex);
}
}
}
/**
* 构建目录
* @param outputDir
* @param subDir
*/
public static void createDirectory(String outputDir,String subDir){
File file = new File(outputDir);
if(!(subDir == null || subDir.trim().equals(""))){//子目录不为空
file = new File(outputDir + "/" + subDir);
}
if(!file.exists()){
if(!file.getParentFile().exists())
file.getParentFile().mkdirs();
file.mkdirs();
}
}3、.tar.gz文件可以看做先用tar打包，再使用gz进行压缩。
使用org.apache.tools.tar.TarEntry; org.apache.tools.tar.TarInputStream 和 org.apache.tools.tar.TarOutputStream
//------------------------------------------------------------------------------------------------------
/**
* 解压tar.gz 文件
* @param file 要解压的tar.gz文件对象
* @param outputDir 要解压到某个指定的目录下
* @throws IOException
*/
public static void unTarGz(File file,String outputDir) throws IOException{
TarInputStream tarIn = null;
try{
tarIn = new TarInputStream(new GZIPInputStream(
new BufferedInputStream(new FileInputStream(file))),
1024 * 2);
createDirectory(outputDir,null);//创建输出目录
TarEntry entry = null;
while( (entry = tarIn.getNextEntry()) != null ){
if(entry.isDirectory()){//是目录
entry.getName();
createDirectory(outputDir,entry.getName());//创建空目录
}else{//是文件
File tmpFile = new File(outputDir + "/" + entry.getName());
createDirectory(tmpFile.getParent() + "/",null);//创建输出目录
OutputStream out = null;
try{
out = new FileOutputStream(tmpFile);
int length = 0;
byte[] b = new byte[2048];
while((length = tarIn.read(b)) != -1){
out.write(b, 0, length);
}
}catch(IOException ex){
throw ex;
}finally{
if(out!=null)
out.close();
}
}
}
}catch(IOException ex){
throw new IOException("解压归档文件出现异常",ex);
} finally{
try{
if(tarIn != null){
tarIn.close();
}
}catch(IOException ex){
throw new IOException("关闭tarFile出现异常",ex);
}
}
}使用到的包头有：
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.charset.Charset; import java.util.Enumeration; import java.util.zip.GZIPInputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; import org.apache.tools.tar.TarEntry; import org.apache.tools.tar.TarInputStream; import org.apache.tools.tar.TarOutputStream;
转自: https://www.cnblogs.com/scw2901/p/4379143.html
