java解压缩.gz .zip .tar.gz等格式的压缩包方法总结

Posted 2021-01-06 haoyul

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

 1 public static void unGzipFile(String sourcedir) {
 2         String ouputfile = "";
 3         try {  
 4             //建立gzip压缩文件输入流 
 5             FileInputStream fin = new FileInputStream(sourcedir);   
 6             //建立gzip解压工作流
 7             GZIPInputStream gzin = new GZIPInputStream(fin);   
 8             //建立解压文件输出流  
 9             ouputfile = sourcedir.substring(0,sourcedir.lastIndexOf(‘.‘));
10             ouputfile = ouputfile.substring(0,ouputfile.lastIndexOf(‘.‘));
11             FileOutputStream fout = new FileOutputStream(ouputfile);   
12             
13             int num;
14             byte[] buf=new byte[1024];
15 
16             while ((num = gzin.read(buf,0,buf.length)) != -1)
17             {   
18                 fout.write(buf,0,num);   
19             }
20 
21             gzin.close();   
22             fout.close();   
23             fin.close();   
24         } catch (Exception ex){  
25             System.err.println(ex.toString());  
26         }  
27         return;
28     }

2、zip文件，使用java.util.zip.ZipEntry 和 java.util.zip.ZipFile

 1 /** 
 2      * 解压缩zipFile 
 3      * @param file 要解压的zip文件对象 
 4      * @param outputDir 要解压到某个指定的目录下 
 5      * @throws IOException 
 6      */  
 7     public static void unZip(File file,String outputDir) throws IOException {     
 8         ZipFile zipFile = null;  
 9           
10         try {  
11             Charset CP866 = Charset.forName("CP866");  //specifying alternative (non UTF-8) charset
12             //ZipFile zipFile = new ZipFile(zipArchive, CP866);
13             zipFile =  new ZipFile(file, CP866);        
14             createDirectory(outputDir,null);//创建输出目录  
15   
16             Enumeration<?> enums = zipFile.entries();  
17             while(enums.hasMoreElements()){  
18                   
19                 ZipEntry entry = (ZipEntry) enums.nextElement();  
20                 System.out.println("解压." +  entry.getName());  
21                   
22                 if(entry.isDirectory()){//是目录
23                     createDirectory(outputDir,entry.getName());//创建空目录                
24                 }else{//是文件      
25                     File tmpFile = new File(outputDir + "/" + entry.getName());   
26                     createDirectory(tmpFile.getParent() + "/",null);//创建输出目录  
27                       
28                     InputStream in = null;    
29                     OutputStream out = null;  
30                     try{  
31                         in = zipFile.getInputStream(entry);;    
32                         out = new FileOutputStream(tmpFile);  
33                         int length = 0;  
34                           
35                         byte[] b = new byte[2048];   
36                         while((length = in.read(b)) != -1){  
37                             out.write(b, 0, length);  
38                         }  
39                       
40                     }catch(IOException ex){  
41                         throw ex;  
42                     }finally{  
43                         if(in!=null)  
44                             in.close();  
45                         if(out!=null)  
46                             out.close();  
47                     }      
48                 }  
49             }  
50               
51         } catch (IOException e) {  
52             throw new IOException("解压缩文件出现异常",e);  
53         } finally{  
54             try{  
55                 if(zipFile != null){  
56                     zipFile.close();  
57                 }  
58             }catch(IOException ex){  
59                 throw new IOException("关闭zipFile出现异常",ex);  
60             }  
61         }      
62     }  
63       
64     /** 
65      * 构建目录 
66      * @param outputDir 
67      * @param subDir 
68      */  
69     public static void createDirectory(String outputDir,String subDir){     
70         File file = new File(outputDir);  
71         if(!(subDir == null || subDir.trim().equals(""))){//子目录不为空  
72             file = new File(outputDir + "/" + subDir);  
73         }  
74         if(!file.exists()){  
75               if(!file.getParentFile().exists())
76                   file.getParentFile().mkdirs();
77             file.mkdirs();  
78         }  
79     }

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

 1 //------------------------------------------------------------------------------------------------------
 2     /** 
 3      * 解压tar.gz 文件 
 4      * @param file 要解压的tar.gz文件对象 
 5      * @param outputDir 要解压到某个指定的目录下 
 6      * @throws IOException 
 7      */  
 8     public static void unTarGz(File file,String outputDir) throws IOException{  
 9         TarInputStream tarIn = null;  
10         try{  
11             tarIn = new TarInputStream(new GZIPInputStream(  
12                     new BufferedInputStream(new FileInputStream(file))),  
13                     1024 * 2);  
14               
15             createDirectory(outputDir,null);//创建输出目录  
16 
17             TarEntry entry = null;  
18             while( (entry = tarIn.getNextEntry()) != null ){  
19                   
20                 if(entry.isDirectory()){//是目录
21                     entry.getName();
22                     createDirectory(outputDir,entry.getName());//创建空目录  
23                 }else{//是文件
24                     File tmpFile = new File(outputDir + "/" + entry.getName());  
25                     createDirectory(tmpFile.getParent() + "/",null);//创建输出目录  
26                     OutputStream out = null;  
27                     try{  
28                         out = new FileOutputStream(tmpFile);  
29                         int length = 0;  
30                           
31                         byte[] b = new byte[2048];  
32                           
33                         while((length = tarIn.read(b)) != -1){  
34                             out.write(b, 0, length);  
35                         }  
36                       
37                     }catch(IOException ex){  
38                         throw ex;  
39                     }finally{  
40                           
41                         if(out!=null)  
42                             out.close();  
43                     }  
44                 }
45             }  
46         }catch(IOException ex){  
47             throw new IOException("解压归档文件出现异常",ex);  
48         } finally{  
49             try{  
50                 if(tarIn != null){  
51                     tarIn.close();  
52                 }  
53             }catch(IOException ex){  
54                 throw new IOException("关闭tarFile出现异常",ex);  
55             }  
56         }  
57     }

使用到的包头有：

 1 import java.io.BufferedInputStream;
 2 import java.io.File;
 3 import java.io.FileInputStream;
 4 import java.io.FileOutputStream;
 5 import java.io.IOException;
 6 import java.io.InputStream;
 7 import java.io.OutputStream;
 8 
 9 import java.nio.charset.Charset;
10 import java.util.Enumeration;
11 import java.util.zip.GZIPInputStream;
12 import java.util.zip.ZipEntry;
13 import java.util.zip.ZipFile;
14 
15 import org.apache.tools.tar.TarEntry;  
16 import org.apache.tools.tar.TarInputStream;  
17 import org.apache.tools.tar.TarOutputStream;