java解压缩.gz .zip .tar.gz等格式的压缩包方法总结

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;